{"transactions":[{"id":3778345,"issuer":{"id":2944,"kind":"organization","name":"AMERICAN TOWER CORP /MA/","symbol":"AMT"},"owners":[{"id":162682,"kind":"person","name":"Marshall Steven C.","position":1,"cik":"0001417856","reported_name":"Marshall Steven C.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Former Officer"}}],"security":"Option to Purchase Common Stock","published_at":"2018-11-01T20:15:27.000Z","date":"2018-10-30","kind":"exercise","acquired":false,"shares":30000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"This option was granted pursuant to the 2007 Equity Incentive Plan, as amended, and is exercisable in 25% cumulative annual increments beginning March 10, 2011."}],"balance_after":0,"derivative":{"exercise_price":43.11,"expiration_date":"2020-03-10","underlying":"Common Stock","underlying_shares":30000},"source":{"system":"sec-edgar","filing":"0001338678-18-000044","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1053507/000133867818000044/edgar.xml","form_type":"4"}},{"id":3778344,"issuer":{"id":2944,"kind":"organization","name":"AMERICAN TOWER CORP /MA/","symbol":"AMT"},"owners":[{"id":162682,"kind":"person","name":"Marshall Steven C.","position":1,"cik":"0001417856","reported_name":"Marshall Steven C.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Former Officer"}}],"security":"Option to Purchase Common Stock","published_at":"2018-11-01T20:15:27.000Z","date":"2018-10-30","kind":"exercise","acquired":false,"shares":71798,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"This option was granted pursuant to the 2007 Equity Incentive Plan, as amended, and is exercisable in 25% cumulative annual increments beginning March 12, 2013."}],"balance_after":0,"derivative":{"exercise_price":62,"expiration_date":"2022-03-12","underlying":"Common Stock","underlying_shares":71798},"source":{"system":"sec-edgar","filing":"0001338678-18-000044","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1053507/000133867818000044/edgar.xml","form_type":"4"}},{"id":3778343,"issuer":{"id":2944,"kind":"organization","name":"AMERICAN TOWER CORP /MA/","symbol":"AMT"},"owners":[{"id":162682,"kind":"person","name":"Marshall Steven C.","position":1,"cik":"0001417856","reported_name":"Marshall Steven C.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Former Officer"}}],"security":"Option to Purchase Common Stock","published_at":"2018-11-01T20:15:27.000Z","date":"2018-10-30","kind":"exercise","acquired":false,"shares":61368,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"This option was granted pursuant to the 2007 Equity Incentive Plan, as amended, and is exercisable in 25% cumulative annual increments beginning March 10, 2012."}],"balance_after":0,"derivative":{"exercise_price":50.78,"expiration_date":"2021-03-10","underlying":"Common Stock","underlying_shares":61368},"source":{"system":"sec-edgar","filing":"0001338678-18-000044","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1053507/000133867818000044/edgar.xml","form_type":"4"}},{"id":3778342,"issuer":{"id":2944,"kind":"organization","name":"AMERICAN TOWER CORP /MA/","symbol":"AMT"},"owners":[{"id":162682,"kind":"person","name":"Marshall Steven C.","position":1,"cik":"0001417856","reported_name":"Marshall Steven C.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Former Officer"}}],"security":"Common Stock","published_at":"2018-11-01T20:15:27.000Z","date":"2018-10-30","kind":"sale","acquired":false,"shares":30000,"price":160,"value":4800000.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 14, 2018."}],"balance_after":104835,"source":{"system":"sec-edgar","filing":"0001338678-18-000044","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1053507/000133867818000044/edgar.xml","form_type":"4"}},{"id":3778341,"issuer":{"id":2944,"kind":"organization","name":"AMERICAN TOWER CORP /MA/","symbol":"AMT"},"owners":[{"id":162682,"kind":"person","name":"Marshall Steven C.","position":1,"cik":"0001417856","reported_name":"Marshall Steven C.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Former Officer"}}],"security":"Common Stock","published_at":"2018-11-01T20:15:27.000Z","date":"2018-10-30","kind":"exercise","acquired":true,"shares":30000,"price":43.11,"value":1293300.0,"ownership":{"direct":true},"balance_after":134835,"source":{"system":"sec-edgar","filing":"0001338678-18-000044","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1053507/000133867818000044/edgar.xml","form_type":"4"}},{"id":3778340,"issuer":{"id":2944,"kind":"organization","name":"AMERICAN TOWER CORP /MA/","symbol":"AMT"},"owners":[{"id":162682,"kind":"person","name":"Marshall Steven C.","position":1,"cik":"0001417856","reported_name":"Marshall Steven C.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Former Officer"}}],"security":"Common Stock","published_at":"2018-11-01T20:15:27.000Z","date":"2018-10-30","kind":"sale","acquired":false,"shares":71798,"price":158,"value":11344084.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 14, 2018."}],"balance_after":104835,"source":{"system":"sec-edgar","filing":"0001338678-18-000044","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1053507/000133867818000044/edgar.xml","form_type":"4"}},{"id":3778339,"issuer":{"id":2944,"kind":"organization","name":"AMERICAN TOWER CORP /MA/","symbol":"AMT"},"owners":[{"id":162682,"kind":"person","name":"Marshall Steven C.","position":1,"cik":"0001417856","reported_name":"Marshall Steven C.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Former Officer"}}],"security":"Common Stock","published_at":"2018-11-01T20:15:27.000Z","date":"2018-10-30","kind":"exercise","acquired":true,"shares":71798,"price":62,"value":4451476.0,"ownership":{"direct":true},"balance_after":176633,"source":{"system":"sec-edgar","filing":"0001338678-18-000044","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1053507/000133867818000044/edgar.xml","form_type":"4"}},{"id":3778338,"issuer":{"id":2944,"kind":"organization","name":"AMERICAN TOWER CORP /MA/","symbol":"AMT"},"owners":[{"id":162682,"kind":"person","name":"Marshall Steven C.","position":1,"cik":"0001417856","reported_name":"Marshall Steven C.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Former Officer"}}],"security":"Common Stock","published_at":"2018-11-01T20:15:27.000Z","date":"2018-10-30","kind":"sale","acquired":false,"shares":61368,"price":154,"value":9450672.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 14, 2018."}],"balance_after":104835,"source":{"system":"sec-edgar","filing":"0001338678-18-000044","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1053507/000133867818000044/edgar.xml","form_type":"4"}},{"id":3778337,"issuer":{"id":2944,"kind":"organization","name":"AMERICAN TOWER CORP /MA/","symbol":"AMT"},"owners":[{"id":162682,"kind":"person","name":"Marshall Steven C.","position":1,"cik":"0001417856","reported_name":"Marshall Steven C.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Former Officer"}}],"security":"Common Stock","published_at":"2018-11-01T20:15:27.000Z","date":"2018-10-30","kind":"exercise","acquired":true,"shares":61368,"price":50.78,"value":3116267.04,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes 141 shares acquired under the Issuer's employee stock purchase plan in May 2018."}],"balance_after":166203,"source":{"system":"sec-edgar","filing":"0001338678-18-000044","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1053507/000133867818000044/edgar.xml","form_type":"4"}},{"id":3998886,"issuer":{"id":2944,"kind":"organization","name":"AMERICAN TOWER CORP /MA/","symbol":"AMT"},"owners":[{"id":162682,"kind":"person","name":"Marshall Steven C.","position":1,"cik":"0001417856","reported_name":"Marshall Steven C.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & President, U.S. Tower"}}],"security":"Common Stock","published_at":"2018-03-13T20:53:11.000Z","date":"2018-03-12","kind":"grant","acquired":true,"shares":11856,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"These RSUs were granted pursuant to the Plan and vest in 25% cumulative annual increments beginning March 12, 2019. Each RSU respresents a contingent right to receive one share of Common Stock."}],"balance_after":104694,"source":{"system":"sec-edgar","filing":"0001338678-18-000022","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1053507/000133867818000022/edgar.xml","form_type":"4"}},{"id":3998885,"issuer":{"id":2944,"kind":"organization","name":"AMERICAN TOWER CORP /MA/","symbol":"AMT"},"owners":[{"id":162682,"kind":"person","name":"Marshall Steven C.","position":1,"cik":"0001417856","reported_name":"Marshall Steven C.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & President, U.S. Tower"}}],"security":"Common Stock","published_at":"2018-03-13T20:53:11.000Z","date":"2018-03-10","kind":"tax_withholding","acquired":false,"shares":13118,"price":143.58,"value":1883482.44,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares delivered to the issuer for the payment of withholding taxes in connection with the vesting of restricted stock units (\"RSUs\") and performance stock units previously granted under the 2007 Equity Incentive Plan, as amended (the \"Plan\")."}],"balance_after":92838,"source":{"system":"sec-edgar","filing":"0001338678-18-000022","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1053507/000133867818000022/edgar.xml","form_type":"4"}},{"id":4024745,"issuer":{"id":2944,"kind":"organization","name":"AMERICAN TOWER CORP /MA/","symbol":"AMT"},"owners":[{"id":162682,"kind":"person","name":"Marshall Steven C.","position":1,"cik":"0001417856","reported_name":"Marshall Steven C.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & President, U.S. Tower"}}],"security":"Common Stock","published_at":"2018-03-01T21:31:36.000Z","date":"2018-02-27","kind":"grant","acquired":true,"shares":6468,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Reflects the number of performance stock units (\"PSUs\") earned, as a result of the Compensation Committee's certification to the achievement of performance, under the terms of a PSU award granted on March 10, 2015. These shares will vest at the end of the three-year performance period, and each PSU represents a contingent right to receive one share of Common Stock."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 42 shares acquired under the issuer's employee stock purchase plan in November 2017."}],"balance_after":105956,"source":{"system":"sec-edgar","filing":"0001338678-18-000007","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1053507/000133867818000007/edgar.xml","form_type":"4"}},{"id":4270372,"issuer":{"id":2944,"kind":"organization","name":"AMERICAN TOWER CORP /MA/","symbol":"AMT"},"owners":[{"id":162682,"kind":"person","name":"Marshall Steven C.","position":1,"cik":"0001417856","reported_name":"Marshall Steven C.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & President, U.S. Tower"}}],"security":"Option to Purchase Common Stock","published_at":"2017-06-29T20:17:35.000Z","date":"2017-06-27","kind":"exercise","acquired":false,"shares":17162,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"This option was granted pursuant to the 2007 Equity Incentive Plan, as amended, and is exercisable in 25% cumulative annual increments beginning March 10, 2010."}],"balance_after":0,"derivative":{"exercise_price":28.39,"expiration_date":"2019-03-10","underlying":"Common Stock","underlying_shares":17162},"source":{"system":"sec-edgar","filing":"0001338678-17-000046","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1053507/000133867817000046/edgar.xml","form_type":"4"}},{"id":4270371,"issuer":{"id":2944,"kind":"organization","name":"AMERICAN TOWER CORP /MA/","symbol":"AMT"},"owners":[{"id":162682,"kind":"person","name":"Marshall Steven C.","position":1,"cik":"0001417856","reported_name":"Marshall Steven C.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & President, U.S. Tower"}}],"security":"Common Stock","published_at":"2017-06-29T20:17:35.000Z","date":"2017-06-27","kind":"sale","acquired":false,"shares":20548,"price":134.92,"value":2772336.16,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 22, 2017."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $134.50 to $135.00 per share."}],"balance_after":99446,"source":{"system":"sec-edgar","filing":"0001338678-17-000046","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1053507/000133867817000046/edgar.xml","form_type":"4"}},{"id":4270370,"issuer":{"id":2944,"kind":"organization","name":"AMERICAN TOWER CORP /MA/","symbol":"AMT"},"owners":[{"id":162682,"kind":"person","name":"Marshall Steven C.","position":1,"cik":"0001417856","reported_name":"Marshall Steven C.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & President, U.S. Tower"}}],"security":"Common Stock","published_at":"2017-06-29T20:17:35.000Z","date":"2017-06-27","kind":"exercise","acquired":true,"shares":17162,"price":28.39,"value":487229.18,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes 192 shares acquired under the issuer's employee stock purchase plan in May 2017."}],"balance_after":119994,"source":{"system":"sec-edgar","filing":"0001338678-17-000046","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1053507/000133867817000046/edgar.xml","form_type":"4"}},{"id":4386792,"issuer":{"id":2944,"kind":"organization","name":"AMERICAN TOWER CORP /MA/","symbol":"AMT"},"owners":[{"id":162682,"kind":"person","name":"Marshall Steven C.","position":1,"cik":"0001417856","reported_name":"Marshall Steven C.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & President, U.S. Tower"}}],"security":"Common Stock","published_at":"2017-03-14T21:17:49.000Z","date":"2017-03-11","kind":"tax_withholding","acquired":false,"shares":2004,"price":113.58,"value":227614.32,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Shares delivered to the issuer for the payment of withholding taxes in connection with the vesting of RSUs previously granted under the 2007 Equity Incentive Plan."}],"balance_after":102640,"source":{"system":"sec-edgar","filing":"0001338678-17-000024","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1053507/000133867817000024/edgar.xml","form_type":"4"}},{"id":4386791,"issuer":{"id":2944,"kind":"organization","name":"AMERICAN TOWER CORP /MA/","symbol":"AMT"},"owners":[{"id":162682,"kind":"person","name":"Marshall Steven C.","position":1,"cik":"0001417856","reported_name":"Marshall Steven C.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & President, U.S. Tower"}}],"security":"Common Stock","published_at":"2017-03-14T21:17:49.000Z","date":"2017-03-10","kind":"tax_withholding","acquired":false,"shares":4728,"price":113.58,"value":537006.24,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Shares delivered to the issuer for the payment of withholding taxes in connection with the vesting of RSUs previously granted under the 2007 Equity Incentive Plan."}],"balance_after":104644,"source":{"system":"sec-edgar","filing":"0001338678-17-000024","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1053507/000133867817000024/edgar.xml","form_type":"4"}},{"id":4386790,"issuer":{"id":2944,"kind":"organization","name":"AMERICAN TOWER CORP /MA/","symbol":"AMT"},"owners":[{"id":162682,"kind":"person","name":"Marshall Steven C.","position":1,"cik":"0001417856","reported_name":"Marshall Steven C.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & President, U.S. Tower"}}],"security":"Common Stock","published_at":"2017-03-14T21:17:49.000Z","date":"2017-03-10","kind":"grant","acquired":true,"shares":14087,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"These Restricted Stock Units (RSUs) were granted pursuant to the 2007 Equity Incentive Plan and vest in 25% cumulative annual increments beginning March 10, 2018. Each RSU respresents a contingent right to receive one share of Common Stock."}],"balance_after":109372,"source":{"system":"sec-edgar","filing":"0001338678-17-000024","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1053507/000133867817000024/edgar.xml","form_type":"4"}},{"id":4414838,"issuer":{"id":2944,"kind":"organization","name":"AMERICAN TOWER CORP /MA/","symbol":"AMT"},"owners":[{"id":162682,"kind":"person","name":"Marshall Steven C.","position":1,"cik":"0001417856","reported_name":"Marshall Steven C.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & President, U.S. Tower"}}],"security":"Common Stock","published_at":"2017-03-01T21:26:14.000Z","date":"2017-02-27","kind":"grant","acquired":true,"shares":5539,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Reflects the number of performance stock units (\"PSUs\") earned, as a result of the Compensation Committee's certification to the achievement of performance, under the terms of a PSU award granted on March 10, 2015. These shares will vest at the end of the three-year performance period, and each PSU represents a contingent right to receive one share of Common Stock."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 57 shares acquired under the Company's employee stock purchase plan in November 2016."}],"balance_after":95285,"source":{"system":"sec-edgar","filing":"0001338678-17-000007","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1053507/000133867817000007/edgar.xml","form_type":"4"}}]}