{"transactions":[{"id":840172,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2026-03-18T01:56:46.000Z","date":"2026-03-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":2186,"price":207.93,"value":454534.98,"ownership":{"direct":true},"balance_after":16396.7715,"source":{"system":"sec-edgar","filing":"0000354190-26-000092","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/354190/000035419026000092/form4.xml","form_type":"4"}},{"id":840171,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2026-03-18T01:56:46.000Z","date":"2026-03-15","kind":"exercise","planned":false,"acquired":true,"shares":6612,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":18582.7715,"source":{"system":"sec-edgar","filing":"0000354190-26-000092","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/354190/000035419026000092/form4.xml","form_type":"4"}},{"id":840170,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock (restricted)","published_at":"2026-03-18T01:56:46.000Z","date":"2026-03-15","kind":"exercise","planned":false,"acquired":false,"shares":6612,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":0,"source":{"system":"sec-edgar","filing":"0000354190-26-000092","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/354190/000035419026000092/form4.xml","form_type":"4"}},{"id":840169,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock (restricted)","published_at":"2026-03-18T01:56:46.000Z","date":"2026-03-15","kind":"grant","planned":false,"acquired":true,"shares":6612,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Performance share units (awarded on March 15, 2023) earned and vested as of March 15, 2026."}],"balance_after":6612,"source":{"system":"sec-edgar","filing":"0000354190-26-000092","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/354190/000035419026000092/form4.xml","form_type":"4"}},{"id":857224,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Phantom Stock","published_at":"2026-03-07T01:11:42.000Z","date":"2026-03-04","kind":"grant","planned":false,"acquired":true,"shares":1982.292,"price":227.01,"value":450000.10692,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of phantom stock represents a right to receive one share of Gallagher common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"These shares represent awards under the Age 62 Plan, a nonqualified deferred compensation plan of the Company, which have been deemed invested in Company common stock at the election of the reporting person.  Participants vest in these awards when they attain age 62, or after a one-year period for participants who have attained age 61."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"These shares represent awards under the Age 62 Plan, a nonqualified deferred compensation plan of the Company, which have been deemed invested in Company common stock at the election of the reporting person.  Participants vest in these awards when they attain age 62, or after a one-year period for participants who have attained age 61."}],"balance_after":100637.795,"derivative":{"underlying":"Common Stock","underlying_shares":1982.292},"source":{"system":"sec-edgar","filing":"0000354190-26-000040","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/354190/000035419026000040/form4.xml","form_type":"4"}},{"id":871934,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Non-qualified Stock Option","published_at":"2026-03-04T00:14:25.000Z","date":"2026-03-01","kind":"grant","planned":false,"acquired":true,"shares":14977,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"One-third of this stock option becomes exercisable on each of the 3rd, 4th, and 5th anniversaries of the grant date."}],"balance_after":14977,"derivative":{"exercise_price":228.2,"expiration_date":"2033-03-01","underlying":"Common Stock","underlying_shares":14977},"source":{"system":"sec-edgar","filing":"0000354190-26-000032","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/354190/000035419026000032/form4.xml","form_type":"4"}},{"id":1141332,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Non-qualified Stock Option","published_at":"2025-05-20T21:32:40.000Z","date":"2025-05-19","kind":"exercise","planned":false,"acquired":false,"shares":13500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date."}],"balance_after":0,"derivative":{"exercise_price":79.59,"expiration_date":"2026-03-14","underlying":"Common Stock","underlying_shares":13500},"source":{"system":"sec-edgar","filing":"0001127602-25-015071","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760225015071/form4.xml","form_type":"4"}},{"id":1141331,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2025-05-20T21:32:40.000Z","date":"2025-05-19","kind":"sale","planned":false,"acquired":false,"shares":13500,"price":344.128,"value":4645728.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported is an average weighted price. The shares were sold in multiple transactions on 5/19/2025 at prices ranging from $344.00 to $344.49. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in the footnotes to this Form 4."}],"balance_after":11940.8404,"source":{"system":"sec-edgar","filing":"0001127602-25-015071","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760225015071/form4.xml","form_type":"4"}},{"id":1141330,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2025-05-20T21:32:40.000Z","date":"2025-05-19","kind":"exercise","planned":false,"acquired":true,"shares":13500,"price":79.59,"value":1074465.0,"ownership":{"direct":true},"balance_after":25440.8404,"source":{"system":"sec-edgar","filing":"0001127602-25-015071","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760225015071/form4.xml","form_type":"4"}},{"id":1202492,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2025-03-18T22:33:34.000Z","date":"2025-03-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":2580,"price":325.24,"value":839119.2,"ownership":{"direct":true},"balance_after":11887.5297,"source":{"system":"sec-edgar","filing":"0001127602-25-009869","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760225009869/form4.xml","form_type":"4"}},{"id":1202491,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2025-03-18T22:33:34.000Z","date":"2025-03-15","kind":"exercise","planned":false,"acquired":true,"shares":6220,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":14467.5297,"source":{"system":"sec-edgar","filing":"0001127602-25-009869","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760225009869/form4.xml","form_type":"4"}},{"id":1202490,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock (restricted)","published_at":"2025-03-18T22:33:34.000Z","date":"2025-03-15","kind":"exercise","planned":false,"acquired":false,"shares":6220,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":0,"source":{"system":"sec-edgar","filing":"0001127602-25-009869","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760225009869/form4.xml","form_type":"4"}},{"id":1202489,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock (restricted)","published_at":"2025-03-18T22:33:34.000Z","date":"2025-03-15","kind":"grant","planned":false,"acquired":true,"shares":6220,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Performance share units (awarded on March 15, 2022) earned and vested as of March 15, 2025."}],"balance_after":6220,"source":{"system":"sec-edgar","filing":"0001127602-25-009869","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760225009869/form4.xml","form_type":"4"}},{"id":1207000,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2025-03-14T23:34:30.000Z","date":"2025-03-12","kind":"tax_withholding","planned":false,"acquired":false,"shares":530,"price":325.76,"value":172652.8,"ownership":{"direct":true},"balance_after":8247.5297,"source":{"system":"sec-edgar","filing":"0001127602-25-009541","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760225009541/form4.xml","form_type":"4"}},{"id":1206999,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2025-03-14T23:34:30.000Z","date":"2025-03-12","kind":"exercise","planned":false,"acquired":true,"shares":1960,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":8777.5297,"source":{"system":"sec-edgar","filing":"0001127602-25-009541","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760225009541/form4.xml","form_type":"4"}},{"id":1206998,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock (restricted)","published_at":"2025-03-14T23:34:30.000Z","date":"2025-03-12","kind":"exercise","planned":false,"acquired":false,"shares":1960,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":0,"source":{"system":"sec-edgar","filing":"0001127602-25-009541","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760225009541/form4.xml","form_type":"4"}},{"id":1213827,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Phantom Stock","published_at":"2025-03-12T00:48:18.000Z","date":"2025-03-10","kind":"other","planned":false,"acquired":true,"shares":1400.866,"price":321.23,"value":450000.18518,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of phantom stock represents a right to receive one share of Gallagher common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"These shares represent awards under the Age 62 Plan, a nonqualified deferred compensation plan of the Company, which have been deemed invested in Company common stock at the election of the reporting person.  Participants vest in these awards when they attain age 62, or after a one-year period for participants who have attained age 61."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"These shares represent awards under the Age 62 Plan, a nonqualified deferred compensation plan of the Company, which have been deemed invested in Company common stock at the election of the reporting person.  Participants vest in these awards when they attain age 62, or after a one-year period for participants who have attained age 61."}],"balance_after":97799.807,"derivative":{"underlying":"Common Stock","underlying_shares":1400.866},"source":{"system":"sec-edgar","filing":"0001127602-25-009185","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760225009185/form4.xml","form_type":"4"}},{"id":1224849,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Non-qualified Stock Option","published_at":"2025-03-06T01:31:34.000Z","date":"2025-03-01","kind":"grant","planned":false,"acquired":true,"shares":10028,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Closing price of Gallagher common stock on February 28, 2025."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date."}],"balance_after":10028,"derivative":{"exercise_price":337.74,"expiration_date":"2032-03-01","underlying":"Common Stock","underlying_shares":10028},"source":{"system":"sec-edgar","filing":"0001127602-25-008445","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760225008445/form4.xml","form_type":"4"}},{"id":1571243,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2024-03-20T00:58:25.000Z","date":"2024-03-16","kind":"tax_withholding","planned":false,"acquired":false,"shares":3272,"price":253.17,"value":828372.24,"ownership":{"direct":true},"balance_after":6710.8305,"source":{"system":"sec-edgar","filing":"0001127602-24-010721","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760224010721/form4.xml","form_type":"4"}},{"id":1571242,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2024-03-20T00:58:25.000Z","date":"2024-03-16","kind":"exercise","planned":false,"acquired":true,"shares":7712,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":9982.8305,"source":{"system":"sec-edgar","filing":"0001127602-24-010721","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760224010721/form4.xml","form_type":"4"}},{"id":1571241,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock (restricted)","published_at":"2024-03-20T00:58:25.000Z","date":"2024-03-16","kind":"exercise","planned":false,"acquired":false,"shares":7712,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":1960,"source":{"system":"sec-edgar","filing":"0001127602-24-010721","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760224010721/form4.xml","form_type":"4"}},{"id":1571240,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock (restricted)","published_at":"2024-03-20T00:58:25.000Z","date":"2024-03-16","kind":"grant","planned":false,"acquired":true,"shares":7712,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Performance share units (awarded on March 16, 2021) earned and vested as of March 16, 2024."}],"balance_after":9672,"source":{"system":"sec-edgar","filing":"0001127602-24-010721","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760224010721/form4.xml","form_type":"4"}},{"id":1573767,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2024-03-19T01:44:52.000Z","date":"2024-03-14","kind":"tax_withholding","planned":false,"acquired":false,"shares":816,"price":254.91,"value":208006.56,"ownership":{"direct":true},"balance_after":2270.8305,"source":{"system":"sec-edgar","filing":"0001127602-24-010526","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760224010526/form4.xml","form_type":"4"}},{"id":1573766,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2024-03-19T01:44:52.000Z","date":"2024-03-14","kind":"exercise","planned":false,"acquired":true,"shares":3025,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":3086.8305,"source":{"system":"sec-edgar","filing":"0001127602-24-010526","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760224010526/form4.xml","form_type":"4"}},{"id":1573765,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock (restricted)","published_at":"2024-03-19T01:44:52.000Z","date":"2024-03-14","kind":"exercise","planned":false,"acquired":false,"shares":3025,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":1960,"source":{"system":"sec-edgar","filing":"0001127602-24-010526","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760224010526/form4.xml","form_type":"4"}},{"id":1600591,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Phantom Stock","published_at":"2024-03-06T00:02:49.000Z","date":"2024-03-04","kind":"other","planned":false,"acquired":true,"shares":1850.86,"price":243.13,"value":449999.5918,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each share of phantom stock represents a right to receive one share of Gallagher common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"These shares represent awards under the Age 62 Plan, a nonqualified deferred compensation plan of the Company, which have been deemed invested in Company common stock at the election of the reporting person.  Participants vest in these awards when they attain age 62, or after a one-year period for participants who have attained age 61."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"These shares represent awards under the Age 62 Plan, a nonqualified deferred compensation plan of the Company, which have been deemed invested in Company common stock at the election of the reporting person.  Participants vest in these awards when they attain age 62, or after a one-year period for participants who have attained age 61."}],"balance_after":95752.759,"derivative":{"underlying":"Common Stock","underlying_shares":1850.86},"source":{"system":"sec-edgar","filing":"0001127602-24-008719","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760224008719/form4.xml","form_type":"4"}},{"id":1600590,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Non-qualified Stock Option","published_at":"2024-03-06T00:02:49.000Z","date":"2024-03-01","kind":"grant","planned":false,"acquired":true,"shares":9210,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"One-third of this stock option becomes exercisable on each of the 3rd, 4th, and 5th anniversaries of the grant date."}],"balance_after":9210,"derivative":{"exercise_price":243.54,"expiration_date":"2031-03-01","underlying":"Common Stock","underlying_shares":9210},"source":{"system":"sec-edgar","filing":"0001127602-24-008719","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760224008719/form4.xml","form_type":"4"}},{"id":1903620,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Non-qualified Stock Option","published_at":"2023-05-05T20:32:10.000Z","date":"2023-05-03","kind":"exercise","planned":false,"acquired":false,"shares":14300,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date."}],"balance_after":0,"derivative":{"exercise_price":70.74,"expiration_date":"2025-03-15","underlying":"Common Stock","underlying_shares":14300},"source":{"system":"sec-edgar","filing":"0001127602-23-014712","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760223014712/form4.xml","form_type":"4"}},{"id":1903619,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Non-qualified Stock Option","published_at":"2023-05-05T20:32:10.000Z","date":"2023-05-03","kind":"exercise","planned":false,"acquired":false,"shares":18400,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date."}],"balance_after":0,"derivative":{"exercise_price":56.86,"expiration_date":"2024-03-16","underlying":"Common Stock","underlying_shares":18400},"source":{"system":"sec-edgar","filing":"0001127602-23-014712","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760223014712/form4.xml","form_type":"4"}},{"id":1903618,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2023-05-05T20:32:10.000Z","date":"2023-05-03","kind":"sale","planned":false,"acquired":false,"shares":32801,"price":211.63,"value":6941675.63,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported is an average weighted price. The shares were sold in multiple transactions at prices ranging from $211.22 through $211.93."}],"balance_after":4.5877,"source":{"system":"sec-edgar","filing":"0001127602-23-014712","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760223014712/form4.xml","form_type":"4"}},{"id":1903617,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2023-05-05T20:32:10.000Z","date":"2023-05-03","kind":"sale","planned":false,"acquired":false,"shares":24618,"price":210.64,"value":5185535.52,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported is an average weighted price. The shares were sold in multiple transactions at prices ranging from $210.18 to $211.14. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes 1 and 2 to this Form 4."}],"balance_after":32805.5877,"source":{"system":"sec-edgar","filing":"0001127602-23-014712","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760223014712/form4.xml","form_type":"4"}},{"id":1903616,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2023-05-05T20:32:10.000Z","date":"2023-05-03","kind":"exercise","planned":false,"acquired":true,"shares":14300,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":57423.5877,"source":{"system":"sec-edgar","filing":"0001127602-23-014712","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760223014712/form4.xml","form_type":"4"}},{"id":1903615,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2023-05-05T20:32:10.000Z","date":"2023-05-03","kind":"exercise","planned":false,"acquired":true,"shares":18400,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":43123.5877,"source":{"system":"sec-edgar","filing":"0001127602-23-014712","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760223014712/form4.xml","form_type":"4"}},{"id":1948946,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Non-qualified Stock Option","published_at":"2023-03-17T23:19:51.000Z","date":"2023-03-15","kind":"grant","acquired":true,"shares":8815,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date."}],"balance_after":8815,"derivative":{"exercise_price":177.09,"expiration_date":"2030-03-15","underlying":"Common Stock","underlying_shares":8815},"source":{"system":"sec-edgar","filing":"0001127602-23-010756","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760223010756/form4.xml","form_type":"4"}},{"id":1948945,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2023-03-17T23:19:51.000Z","date":"2023-03-15","kind":"tax_withholding","acquired":false,"shares":1530,"price":177.09,"value":270947.7,"ownership":{"direct":true},"balance_after":24649.1604,"source":{"system":"sec-edgar","filing":"0001127602-23-010756","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760223010756/form4.xml","form_type":"4"}},{"id":1948944,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2023-03-17T23:19:51.000Z","date":"2023-03-15","kind":"exercise","acquired":true,"shares":3450,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":26179.1604,"source":{"system":"sec-edgar","filing":"0001127602-23-010756","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760223010756/form4.xml","form_type":"4"}},{"id":1948943,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock (restricted)","published_at":"2023-03-17T23:19:51.000Z","date":"2023-03-15","kind":"exercise","acquired":false,"shares":3450,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":4985,"source":{"system":"sec-edgar","filing":"0001127602-23-010756","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760223010756/form4.xml","form_type":"4"}},{"id":1955739,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Phantom Stock","published_at":"2023-03-15T01:21:25.000Z","date":"2023-03-10","kind":"other","acquired":true,"shares":3630,"price":185.95,"value":674998.5,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each share of phantom stock represents a right to receive one share of Gallagher common stock."},{"field":"shares","element":"transactionShares","label":"F3","text":"These shares represent awards under the Age 62 Plan, a nonqualified deferred compensation plan of the Company, which have been deemed invested in Company common stock at the election of the reporting person.  Participants vest in these awards when they attain age 62, or after a one-year period for participants who have attained age 61."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"These shares represent awards under the Age 62 Plan, a nonqualified deferred compensation plan of the Company, which have been deemed invested in Company common stock at the election of the reporting person.  Participants vest in these awards when they attain age 62, or after a one-year period for participants who have attained age 61."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"These shares represent awards under the Age 62 Plan, a nonqualified deferred compensation plan of the Company, which have been deemed invested in Company common stock at the election of the reporting person.  Participants vest in these awards when they attain age 62, or after a one-year period for participants who have attained age 61."}],"balance_after":92932.874,"derivative":{"underlying":"Common Stock","underlying_shares":3630},"source":{"system":"sec-edgar","filing":"0001127602-23-010192","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760223010192/form4.xml","form_type":"4"}},{"id":1955738,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2023-03-15T01:21:25.000Z","date":"2023-03-12","kind":"tax_withholding","acquired":false,"shares":2873,"price":182.76,"value":525069.48,"ownership":{"direct":true},"balance_after":22729.1604,"source":{"system":"sec-edgar","filing":"0001127602-23-010192","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760223010192/form4.xml","form_type":"4"}},{"id":1955737,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2023-03-15T01:21:25.000Z","date":"2023-03-12","kind":"exercise","acquired":true,"shares":8340,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":25602.1604,"source":{"system":"sec-edgar","filing":"0001127602-23-010192","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760223010192/form4.xml","form_type":"4"}},{"id":1955736,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock (restricted)","published_at":"2023-03-15T01:21:25.000Z","date":"2023-03-12","kind":"exercise","acquired":false,"shares":8340,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":8435,"source":{"system":"sec-edgar","filing":"0001127602-23-010192","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760223010192/form4.xml","form_type":"4"}},{"id":1955735,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock (restricted)","published_at":"2023-03-15T01:21:25.000Z","date":"2023-03-12","kind":"grant","acquired":true,"shares":8340,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Performance share units (awarded on March 12, 2020) earned and vested as of March 12, 2023."}],"balance_after":16775,"source":{"system":"sec-edgar","filing":"0001127602-23-010192","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760223010192/form4.xml","form_type":"4"}},{"id":2238445,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Non-qualified Stock Option","published_at":"2022-06-09T20:23:35.000Z","date":"2022-06-07","kind":"exercise","acquired":false,"shares":4966,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date."}],"balance_after":0,"derivative":{"exercise_price":43.71,"expiration_date":"2023-03-17","underlying":"Common Stock","underlying_shares":4966},"source":{"system":"sec-edgar","filing":"0001127602-22-017129","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760222017129/form4.xml","form_type":"4"}},{"id":2238444,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2022-06-09T20:23:35.000Z","date":"2022-06-07","kind":"sale","acquired":false,"shares":4966,"price":162.04,"value":804690.64,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported is an average weighted price. The shares were sold in multiple transactions at prices ranging from $162.00 to $162.29. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."}],"balance_after":17160.0635,"source":{"system":"sec-edgar","filing":"0001127602-22-017129","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760222017129/form4.xml","form_type":"4"}},{"id":2238443,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2022-06-09T20:23:35.000Z","date":"2022-06-07","kind":"exercise","acquired":true,"shares":4966,"price":43.71,"value":217063.86,"ownership":{"direct":true},"balance_after":22126.0635,"source":{"system":"sec-edgar","filing":"0001127602-22-017129","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760222017129/form4.xml","form_type":"4"}},{"id":2332103,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Phantom Stock","published_at":"2022-03-17T00:59:50.000Z","date":"2022-03-16","kind":"other","acquired":true,"shares":2843.4,"price":158.26,"value":449996.484,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"Each share of phantom stock represents a right to receive one share of Gallagher common stock."},{"field":"shares","element":"transactionShares","label":"F4","text":"These shares represent awards under the Age 62 Plan, a nonqualified deferred compensation plan of the Company, which have been deemed invested in Company common stock at the election of the reporting person.  Participants vest in these awards when they attain age 62, or after a one-year period for participants who have attained age 61."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"These shares represent awards under the Age 62 Plan, a nonqualified deferred compensation plan of the Company, which have been deemed invested in Company common stock at the election of the reporting person.  Participants vest in these awards when they attain age 62, or after a one-year period for participants who have attained age 61."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"These shares represent awards under the Age 62 Plan, a nonqualified deferred compensation plan of the Company, which have been deemed invested in Company common stock at the election of the reporting person.  Participants vest in these awards when they attain age 62, or after a one-year period for participants who have attained age 61."}],"balance_after":88245.058,"derivative":{"underlying":"Common Stock","underlying_shares":2843.4},"source":{"system":"sec-edgar","filing":"0001127602-22-009552","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760222009552/form4.xml","form_type":"4"}},{"id":2332102,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Non-qualified Stock Option","published_at":"2022-03-17T00:59:50.000Z","date":"2022-03-15","kind":"grant","acquired":true,"shares":9875,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date."}],"balance_after":9875,"derivative":{"exercise_price":158.56,"expiration_date":"2029-03-15","underlying":"Common Stock","underlying_shares":9875},"source":{"system":"sec-edgar","filing":"0001127602-22-009552","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760222009552/form4.xml","form_type":"4"}},{"id":2332101,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2022-03-17T00:59:50.000Z","date":"2022-03-16","kind":"tax_withholding","acquired":false,"shares":1705,"price":162.67,"value":277352.35,"ownership":{"direct":true},"balance_after":17116.1338,"source":{"system":"sec-edgar","filing":"0001127602-22-009552","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760222009552/form4.xml","form_type":"4"}},{"id":2332100,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2022-03-17T00:59:50.000Z","date":"2022-03-16","kind":"exercise","acquired":true,"shares":3850,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":18821.1338,"source":{"system":"sec-edgar","filing":"0001127602-22-009552","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760222009552/form4.xml","form_type":"4"}},{"id":2332099,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock (restricted)","published_at":"2022-03-17T00:59:50.000Z","date":"2022-03-16","kind":"exercise","acquired":false,"shares":3850,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":8435,"source":{"system":"sec-edgar","filing":"0001127602-22-009552","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760222009552/form4.xml","form_type":"4"}},{"id":2332098,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2022-03-17T00:59:50.000Z","date":"2022-03-14","kind":"tax_withholding","acquired":false,"shares":2323,"price":154.74,"value":359461.02,"ownership":{"direct":true},"balance_after":14971.1338,"source":{"system":"sec-edgar","filing":"0001127602-22-009552","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760222009552/form4.xml","form_type":"4"}},{"id":2332097,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2022-03-17T00:59:50.000Z","date":"2022-03-14","kind":"exercise","acquired":true,"shares":7200,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":17294.1338,"source":{"system":"sec-edgar","filing":"0001127602-22-009552","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760222009552/form4.xml","form_type":"4"}},{"id":2332096,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock (restricted)","published_at":"2022-03-17T00:59:50.000Z","date":"2022-03-14","kind":"exercise","acquired":false,"shares":7200,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":12285,"source":{"system":"sec-edgar","filing":"0001127602-22-009552","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760222009552/form4.xml","form_type":"4"}},{"id":2332095,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock (restricted)","published_at":"2022-03-17T00:59:50.000Z","date":"2022-03-14","kind":"grant","acquired":true,"shares":7200,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Performance share units (awarded on March 14, 2019) earned and vested as of March 14, 2022."}],"balance_after":19485,"source":{"system":"sec-edgar","filing":"0001127602-22-009552","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760222009552/form4.xml","form_type":"4"}},{"id":2373399,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Notional Stock Units","published_at":"2022-02-25T23:49:40.000Z","date":"2022-02-23","kind":"grant","acquired":true,"shares":436.23,"price":153.73,"value":67061.6379,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each notional stock unit represents a right to receive one share of Gallagher common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The notional stock units become payable following the reporting person's separation from service with Gallagher."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The notional stock units become payable following the reporting person's separation from service with Gallagher."}],"balance_after":12982.45,"derivative":{"exercise_price":0,"underlying":"Common Stock","underlying_shares":436.23},"source":{"system":"sec-edgar","filing":"0001127602-22-006866","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760222006866/form4.xml","form_type":"4"}},{"id":2780414,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Phantom Stock","published_at":"2021-03-18T22:09:46.000Z","date":"2021-03-17","kind":"other","acquired":true,"shares":3531.6,"price":127.42,"value":449996.472,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each share of phantom stock represents a right to receive one share of Gallagher common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"These shares represent awards under the Age 62 Plan, a nonqualified deferred compensation plan of the Company, which have been deemed invested in Company common stock at the election of the reporting person.  Participants vest in these awards when they attain age 62, or after a one-year period for participants who have attained age 61."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"These shares represent awards under the Age 62 Plan, a nonqualified deferred compensation plan of the Company, which have been deemed invested in Company common stock at the election of the reporting person.  Participants vest in these awards when they attain age 62, or after a one-year period for participants who have attained age 61."}],"balance_after":83992.5,"derivative":{"underlying":"Common Stock","underlying_shares":3531.6},"source":{"system":"sec-edgar","filing":"0001127602-21-011457","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760221011457/form4.xml","form_type":"4"}},{"id":2780413,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Non-qualified Stock Option","published_at":"2021-03-18T22:09:46.000Z","date":"2021-03-16","kind":"grant","acquired":true,"shares":21210,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date."}],"balance_after":21210,"derivative":{"exercise_price":127.9,"expiration_date":"2028-03-16","underlying":"Common Stock","underlying_shares":21210},"source":{"system":"sec-edgar","filing":"0001127602-21-011457","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760221011457/form4.xml","form_type":"4"}},{"id":2780412,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2021-03-18T22:09:46.000Z","date":"2021-03-17","kind":"tax_withholding","acquired":false,"shares":2038,"price":128.43,"value":261740.34,"ownership":{"direct":true},"balance_after":9893.7527,"source":{"system":"sec-edgar","filing":"0001127602-21-011457","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760221011457/form4.xml","form_type":"4"}},{"id":2780411,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2021-03-18T22:09:46.000Z","date":"2021-03-17","kind":"exercise","acquired":true,"shares":4600,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":11931.7527,"source":{"system":"sec-edgar","filing":"0001127602-21-011457","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760221011457/form4.xml","form_type":"4"}},{"id":2780410,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock (restricted)","published_at":"2021-03-18T22:09:46.000Z","date":"2021-03-17","kind":"exercise","acquired":false,"shares":4600,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":11835,"source":{"system":"sec-edgar","filing":"0001127602-21-011457","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760221011457/form4.xml","form_type":"4"}},{"id":2784542,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2021-03-18T00:07:24.000Z","date":"2021-03-15","kind":"tax_withholding","acquired":false,"shares":2622,"price":127.21,"value":333544.62,"ownership":{"direct":true},"balance_after":7331.7527,"source":{"system":"sec-edgar","filing":"0001127602-21-011239","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760221011239/form4.xml","form_type":"4"}},{"id":2784541,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2021-03-18T00:07:24.000Z","date":"2021-03-15","kind":"exercise","acquired":true,"shares":8300,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":9953.7527,"source":{"system":"sec-edgar","filing":"0001127602-21-011239","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760221011239/form4.xml","form_type":"4"}},{"id":2784540,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock (restricted)","published_at":"2021-03-18T00:07:24.000Z","date":"2021-03-15","kind":"exercise","acquired":false,"shares":8300,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":16435,"source":{"system":"sec-edgar","filing":"0001127602-21-011239","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760221011239/form4.xml","form_type":"4"}},{"id":2784539,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock (restricted)","published_at":"2021-03-18T00:07:24.000Z","date":"2021-03-15","kind":"grant","acquired":true,"shares":8300,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Performance share units (awarded on March 15, 2018) earned and vested as of March 15, 2021."}],"balance_after":24735,"source":{"system":"sec-edgar","filing":"0001127602-21-011239","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760221011239/form4.xml","form_type":"4"}},{"id":2834217,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2021-02-25T23:52:11.000Z","date":"2021-02-23","kind":"sale","acquired":false,"shares":121.1,"price":123.13,"value":14911.043,"ownership":{"direct":false,"nature":"Gallagher 401(k) plan account"},"balance_after":0,"source":{"system":"sec-edgar","filing":"0001127602-21-007978","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760221007978/form4.xml","form_type":"4"}},{"id":2870398,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Notional Stock Units","published_at":"2021-02-10T23:54:54.000Z","date":"2021-02-08","kind":"grant","acquired":true,"shares":611.8,"price":117.68,"value":71996.624,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each notional stock unit represents a right to receive one share of Gallagher common stock."},{"field":"shares","element":"transactionShares","label":"F2","text":"Company match under Supplemental Savings and Thrift Plan."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The notional stock units become payable following the reporting person's separation from service with Gallagher."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The notional stock units become payable following the reporting person's separation from service with Gallagher."}],"balance_after":12545.8,"derivative":{"exercise_price":0,"underlying":"Common Stock","underlying_shares":611.8},"source":{"system":"sec-edgar","filing":"0001127602-21-005055","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760221005055/form4.xml","form_type":"4"}},{"id":2959700,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Non-qualified Stock Option","published_at":"2020-12-03T22:25:23.000Z","date":"2020-12-02","kind":"exercise","acquired":false,"shares":24950,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date."}],"balance_after":0,"derivative":{"exercise_price":46.17,"expiration_date":"2022-03-11","underlying":"Common Stock","underlying_shares":24950},"source":{"system":"sec-edgar","filing":"0001127602-20-030486","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760220030486/form4.xml","form_type":"4"}},{"id":2959699,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2020-12-03T22:25:23.000Z","date":"2020-12-02","kind":"sale","acquired":false,"shares":24950,"price":116.71,"value":2911914.5,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported is an average weighted price. The shares were sold in multiple transactions at prices ranging from $116.50 to $117.00. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."}],"balance_after":1653.7527,"source":{"system":"sec-edgar","filing":"0001127602-20-030486","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760220030486/form4.xml","form_type":"4"}},{"id":2959698,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2020-12-03T22:25:23.000Z","date":"2020-12-02","kind":"exercise","acquired":true,"shares":24950,"price":46.17,"value":1151941.5,"ownership":{"direct":true},"balance_after":26603.7527,"source":{"system":"sec-edgar","filing":"0001127602-20-030486","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760220030486/form4.xml","form_type":"4"}},{"id":3059431,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Non-qualified Stock Option","published_at":"2020-08-13T22:05:29.000Z","date":"2020-08-12","kind":"exercise","acquired":false,"shares":1717,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date."}],"balance_after":24950,"derivative":{"exercise_price":46.17,"expiration_date":"2022-03-11","underlying":"Common Stock","underlying_shares":1717},"source":{"system":"sec-edgar","filing":"0001127602-20-023555","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760220023555/form4.xml","form_type":"4"}},{"id":3059430,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Non-qualified Stock Option","published_at":"2020-08-13T22:05:29.000Z","date":"2020-08-11","kind":"exercise","acquired":false,"shares":300,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date."}],"balance_after":26667,"derivative":{"exercise_price":46.17,"expiration_date":"2022-03-11","underlying":"Common Stock","underlying_shares":300},"source":{"system":"sec-edgar","filing":"0001127602-20-023555","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760220023555/form4.xml","form_type":"4"}},{"id":3059429,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Non-qualified Stock Option","published_at":"2020-08-13T22:05:29.000Z","date":"2020-08-11","kind":"exercise","acquired":false,"shares":4967,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date."}],"balance_after":4966,"derivative":{"exercise_price":43.71,"expiration_date":"2023-03-17","underlying":"Common Stock","underlying_shares":4967},"source":{"system":"sec-edgar","filing":"0001127602-20-023555","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760220023555/form4.xml","form_type":"4"}},{"id":3059428,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Non-qualified Stock Option","published_at":"2020-08-13T22:05:29.000Z","date":"2020-08-11","kind":"exercise","acquired":false,"shares":3433,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date."}],"balance_after":0,"derivative":{"exercise_price":46.17,"expiration_date":"2022-03-11","underlying":"Common Stock","underlying_shares":3433},"source":{"system":"sec-edgar","filing":"0001127602-20-023555","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760220023555/form4.xml","form_type":"4"}},{"id":3059427,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2020-08-13T22:05:29.000Z","date":"2020-08-12","kind":"sale","acquired":false,"shares":1717,"price":108.47,"value":186242.99,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported is an average weighted price. The shares were sold in multiple transactions at prices ranging from $108.26 to $109.07. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."}],"balance_after":1653.7527,"source":{"system":"sec-edgar","filing":"0001127602-20-023555","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760220023555/form4.xml","form_type":"4"}},{"id":3059426,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2020-08-13T22:05:29.000Z","date":"2020-08-12","kind":"exercise","acquired":true,"shares":1717,"price":46.17,"value":79273.89,"ownership":{"direct":true},"balance_after":3370.7527,"source":{"system":"sec-edgar","filing":"0001127602-20-023555","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760220023555/form4.xml","form_type":"4"}},{"id":3059425,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2020-08-13T22:05:29.000Z","date":"2020-08-11","kind":"sale","acquired":false,"shares":8700,"price":108.5,"value":943950.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported is an average weighted price. The shares were sold in multiple transactions at prices ranging from $108.39 to $108.51. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."}],"balance_after":1653.7527,"source":{"system":"sec-edgar","filing":"0001127602-20-023555","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760220023555/form4.xml","form_type":"4"}},{"id":3059424,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2020-08-13T22:05:29.000Z","date":"2020-08-11","kind":"exercise","acquired":true,"shares":300,"price":46.17,"value":13851.0,"ownership":{"direct":true},"balance_after":10353.7527,"source":{"system":"sec-edgar","filing":"0001127602-20-023555","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760220023555/form4.xml","form_type":"4"}},{"id":3059423,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2020-08-13T22:05:29.000Z","date":"2020-08-11","kind":"exercise","acquired":true,"shares":4967,"price":43.71,"value":217107.57,"ownership":{"direct":true},"balance_after":10053.7527,"source":{"system":"sec-edgar","filing":"0001127602-20-023555","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760220023555/form4.xml","form_type":"4"}},{"id":3059422,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2020-08-13T22:05:29.000Z","date":"2020-08-11","kind":"exercise","acquired":true,"shares":3433,"price":46.17,"value":158501.61,"ownership":{"direct":true},"balance_after":5086.7527,"source":{"system":"sec-edgar","filing":"0001127602-20-023555","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760220023555/form4.xml","form_type":"4"}},{"id":3207527,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Notional Stock Units","published_at":"2020-03-17T19:30:25.000Z","date":"2020-03-16","kind":"exercise","acquired":true,"shares":7826,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F4","text":"Each notional stock unit represents a right to receive one share of Gallagher common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"The notional stock units become payable following the reporting person's separation from service with Gallagher."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"The notional stock units become payable following the reporting person's separation from service with Gallagher."}],"balance_after":11934,"derivative":{"exercise_price":0,"underlying":"Common Stock","underlying_shares":7826},"source":{"system":"sec-edgar","filing":"0001127602-20-011034","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760220011034/form4.xml","form_type":"4"}},{"id":3207526,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Phantom Stock","published_at":"2020-03-17T19:30:25.000Z","date":"2020-03-13","kind":"other","acquired":true,"shares":4636.1,"price":86.28,"value":400002.708,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each share of phantom stock represents a right to receive one share of Gallagher common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"These shares represent awards under the Age 62 Plan, a nonqualified deferred compensation plan of the Company, which have been deemed invested in Company common stock at the election of the reporting person.  Participants vest in these awards when they attain age 62, or after a one-year period for participants who have attained age 61."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"These shares represent awards under the Age 62 Plan, a nonqualified deferred compensation plan of the Company, which have been deemed invested in Company common stock at the election of the reporting person.  Participants vest in these awards when they attain age 62, or after a one-year period for participants who have attained age 61."}],"balance_after":79269.6,"derivative":{"underlying":"Common Stock","underlying_shares":4636.1},"source":{"system":"sec-edgar","filing":"0001127602-20-011034","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760220011034/form4.xml","form_type":"4"}},{"id":3207525,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock (restricted)","published_at":"2020-03-17T19:30:25.000Z","date":"2020-03-16","kind":"exercise","acquired":false,"shares":7826,"price":79.85,"value":624906.1,"ownership":{"direct":true},"balance_after":16435,"source":{"system":"sec-edgar","filing":"0001127602-20-011034","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760220011034/form4.xml","form_type":"4"}},{"id":3207524,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock (restricted)","published_at":"2020-03-17T19:30:25.000Z","date":"2020-03-16","kind":"grant","acquired":true,"shares":7826,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Performance share units (awarded on March 16, 2017) earned and vested as of March 16, 2020."}],"balance_after":24261,"source":{"system":"sec-edgar","filing":"0001127602-20-011034","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760220011034/form4.xml","form_type":"4"}},{"id":3209913,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Non-qualified Stock Option","published_at":"2020-03-16T20:34:17.000Z","date":"2020-03-12","kind":"grant","acquired":true,"shares":15020,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date."}],"balance_after":15020,"derivative":{"exercise_price":86.17,"expiration_date":"2027-03-12","underlying":"Common Stock","underlying_shares":15020},"source":{"system":"sec-edgar","filing":"0001127602-20-010802","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760220010802/form4.xml","form_type":"4"}},{"id":3209912,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock (restricted)","published_at":"2020-03-16T20:34:17.000Z","date":"2020-03-12","kind":"grant","acquired":true,"shares":1960,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"Restricted stock unit award vesting five years after the date of grant."}],"balance_after":16435,"source":{"system":"sec-edgar","filing":"0001127602-20-010802","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760220010802/form4.xml","form_type":"4"}},{"id":3212440,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2020-03-13T19:16:06.000Z","date":"2020-03-11","kind":"tax_withholding","acquired":false,"shares":1108,"price":94.98,"value":105237.84,"ownership":{"direct":true},"balance_after":1392,"source":{"system":"sec-edgar","filing":"0001127602-20-010588","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760220010588/form4.xml","form_type":"4"}},{"id":3212439,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2020-03-13T19:16:06.000Z","date":"2020-03-11","kind":"exercise","acquired":true,"shares":2500,"price":94.98,"value":237450.0,"ownership":{"direct":true},"balance_after":2500,"source":{"system":"sec-edgar","filing":"0001127602-20-010588","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760220010588/form4.xml","form_type":"4"}},{"id":3212438,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock (restricted)","published_at":"2020-03-13T19:16:06.000Z","date":"2020-03-11","kind":"exercise","acquired":false,"shares":2500,"price":94.98,"value":237450.0,"ownership":{"direct":true},"balance_after":14475,"source":{"system":"sec-edgar","filing":"0001127602-20-010588","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760220010588/form4.xml","form_type":"4"}},{"id":3285619,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Non-qualified Stock Option","published_at":"2020-02-07T22:37:56.000Z","date":"2020-02-06","kind":"exercise","acquired":false,"shares":3433,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date."}],"balance_after":3433,"derivative":{"exercise_price":46.17,"expiration_date":"2022-03-11","underlying":"Common Stock","underlying_shares":3433},"source":{"system":"sec-edgar","filing":"0001127602-20-004388","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760220004388/form4.xml","form_type":"4"}},{"id":3285618,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2020-02-07T22:37:56.000Z","date":"2020-02-06","kind":"sale","acquired":false,"shares":3433,"price":105.28,"value":361426.24,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported is an average weighted price. The shares were sold in multiple transactions at prices ranging from $105.27 to $105.31. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001127602-20-004388","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760220004388/form4.xml","form_type":"4"}},{"id":3285617,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2020-02-07T22:37:56.000Z","date":"2020-02-06","kind":"exercise","acquired":true,"shares":3433,"price":46.17,"value":158501.61,"ownership":{"direct":true},"balance_after":3433,"source":{"system":"sec-edgar","filing":"0001127602-20-004388","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760220004388/form4.xml","form_type":"4"}},{"id":3358162,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Non-qualified Stock Option","published_at":"2019-11-27T21:04:49.000Z","date":"2019-11-26","kind":"exercise","acquired":false,"shares":3599,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date."}],"balance_after":0,"derivative":{"exercise_price":46.87,"expiration_date":"2021-03-12","underlying":"Common Stock","underlying_shares":3599},"source":{"system":"sec-edgar","filing":"0001127602-19-033814","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760219033814/form4.xml","form_type":"4"}},{"id":3358161,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2019-11-27T21:04:49.000Z","date":"2019-11-26","kind":"sale","acquired":false,"shares":3599,"price":92,"value":331108.0,"ownership":{"direct":true},"balance_after":0,"source":{"system":"sec-edgar","filing":"0001127602-19-033814","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760219033814/form4.xml","form_type":"4"}},{"id":3358160,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2019-11-27T21:04:49.000Z","date":"2019-11-26","kind":"exercise","acquired":true,"shares":3599,"price":46.87,"value":168685.13,"ownership":{"direct":true},"balance_after":3599,"source":{"system":"sec-edgar","filing":"0001127602-19-033814","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760219033814/form4.xml","form_type":"4"}},{"id":3409408,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Non-qualified Stock Option","published_at":"2019-09-20T21:00:35.000Z","date":"2019-09-19","kind":"exercise","acquired":false,"shares":13033,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date."}],"balance_after":26967,"derivative":{"exercise_price":46.17,"expiration_date":"2022-03-11","underlying":"Common Stock","underlying_shares":13033},"source":{"system":"sec-edgar","filing":"0001127602-19-028892","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760219028892/form4.xml","form_type":"4"}},{"id":3409407,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Non-qualified Stock Option","published_at":"2019-09-20T21:00:35.000Z","date":"2019-09-19","kind":"exercise","acquired":false,"shares":4967,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date."}],"balance_after":9933,"derivative":{"exercise_price":43.71,"expiration_date":"2023-03-17","underlying":"Common Stock","underlying_shares":4967},"source":{"system":"sec-edgar","filing":"0001127602-19-028892","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760219028892/form4.xml","form_type":"4"}},{"id":3409406,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2019-09-20T21:00:35.000Z","date":"2019-09-19","kind":"sale","acquired":false,"shares":18000,"price":90.33,"value":1625940.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported is an average weighted price. The shares were sold in multiple transactions at prices ranging from $90.26 to $90.45. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information"}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001127602-19-028892","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760219028892/form4.xml","form_type":"4"}},{"id":3409405,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2019-09-20T21:00:35.000Z","date":"2019-09-19","kind":"exercise","acquired":true,"shares":13033,"price":46.17,"value":601733.61,"ownership":{"direct":true},"balance_after":18000,"source":{"system":"sec-edgar","filing":"0001127602-19-028892","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760219028892/form4.xml","form_type":"4"}},{"id":3409404,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2019-09-20T21:00:35.000Z","date":"2019-09-19","kind":"exercise","acquired":true,"shares":4967,"price":43.71,"value":217107.57,"ownership":{"direct":true},"balance_after":4967,"source":{"system":"sec-edgar","filing":"0001127602-19-028892","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760219028892/form4.xml","form_type":"4"}},{"id":3505802,"issuer":{"id":990,"kind":"organization","name":"Arthur J. Gallagher & Co.","symbol":"AJG"},"owners":[{"id":60354,"kind":"person","name":"Pietrucha Susan E","position":1,"cik":"0001386997","reported_name":"Pietrucha Susan E","relationship":{"officer":true,"officer_title":"Chief Human Resources Officer"}}],"security":"Common Stock","published_at":"2019-06-03T22:14:50.000Z","date":"2019-05-24","kind":"sale","acquired":false,"shares":1990,"price":84.29,"value":167737.1,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported is an average weighted price. The shares were sold in multiple transactions at prices ranging from $84.28 to $84.30. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001127602-19-020565","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/354190/000112760219020565/form4.xml","form_type":"4"}}],"next_cursor":"2019-06-03T22:14:50.000000Z,3505802"}