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The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."}],"balance_after":280984,"source":{"system":"sec-edgar","filing":"0001562180-21-004525","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1652824/000156218021004525/primarydocument.xml","form_type":"4"}},{"id":2653450,"issuer":{"id":2211,"kind":"organization","name":"REGENXBIO Inc.","symbol":"RGNX"},"owners":[{"id":42388,"kind":"person","name":"Mills Kenneth T.","position":1,"cik":"0001652824","reported_name":"Mills Kenneth T.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-06-28T20:18:52.000Z","date":"2021-06-24","kind":"exercise","acquired":true,"shares":4500,"price":3.76,"value":16920.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was effected pursuant to a Rule 10b5-1 trading plan."}],"balance_after":285484,"source":{"system":"sec-edgar","filing":"0001562180-21-004525","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1652824/000156218021004525/primarydocument.xml","form_type":"4"}},{"id":2826505,"issuer":{"id":2211,"kind":"organization","name":"REGENXBIO Inc.","symbol":"RGNX"},"owners":[{"id":42388,"kind":"person","name":"Mills Kenneth T.","position":1,"cik":"0001652824","reported_name":"Mills Kenneth T.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Employee Stock Option (Right to Buy)","published_at":"2021-03-01T22:18:19.000Z","date":"2021-02-25","kind":"exercise","acquired":false,"shares":1500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was effected pursuant to a Rule 10b5-1 trading plan."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The previously granted option, representing a right to purchase a total of 708,200 shares, became exercisable as follows: 474,490 of the shares subject to the option are initial shares (\"Initial Shares\") and 233,710 of the shares subject to the option are contingent shares (\"Contingent Shares\"). 120,394 of the Initial Shares vested on September 17, 2014, 88,524 of the Initial Shares vested on September 17, 2015 and an additional 7,377 of the Initial Shares vested upon each month of continuous service to the Company thereafter. 25% of the Contingent Shares were deemed vested as of September 17, 2014 on January 13, 2015 due to a subsequent event. 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The remainder of the Contingent Shares vested over four years of service following September 17, 2014, with 25% of the remaining 75% of Contingent Shares having vested on September 17, 2015 and the remaining Contingent Shares having vested in 36 equal monthly installments thereafter."}],"balance_after":41170,"derivative":{"exercise_price":0.85,"expiration_date":"2024-09-23","underlying":"Common Stock","underlying_shares":6500},"source":{"system":"sec-edgar","filing":"0001562180-21-000562","document":"primarydocument.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1652824/000156218021000562/primarydocument.xml","form_type":"4"}},{"id":2893500,"issuer":{"id":2211,"kind":"organization","name":"REGENXBIO Inc.","symbol":"RGNX"},"owners":[{"id":42388,"kind":"person","name":"Mills Kenneth T.","position":1,"cik":"0001652824","reported_name":"Mills Kenneth T.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-01-27T21:19:10.000Z","date":"2021-01-25","kind":"sale","acquired":false,"shares":5211,"price":44.99,"value":234442.89,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was effected pursuant to a Rule 10b5-1 trading plan."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"This transaction was executed in multiple trades at prices ranging from $44.55 to $45.00. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."}],"balance_after":280984,"source":{"system":"sec-edgar","filing":"0001562180-21-000562","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1652824/000156218021000562/primarydocument.xml","form_type":"4"}},{"id":2893499,"issuer":{"id":2211,"kind":"organization","name":"REGENXBIO Inc.","symbol":"RGNX"},"owners":[{"id":42388,"kind":"person","name":"Mills Kenneth T.","position":1,"cik":"0001652824","reported_name":"Mills Kenneth T.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-01-27T21:19:10.000Z","date":"2021-01-25","kind":"sale","acquired":false,"shares":974,"price":44.05,"value":42904.7,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was effected pursuant to a Rule 10b5-1 trading plan."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"This transaction was executed in multiple trades at prices ranging from $43.55 to $44.52. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."}],"balance_after":286195,"source":{"system":"sec-edgar","filing":"0001562180-21-000562","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1652824/000156218021000562/primarydocument.xml","form_type":"4"}},{"id":2893498,"issuer":{"id":2211,"kind":"organization","name":"REGENXBIO Inc.","symbol":"RGNX"},"owners":[{"id":42388,"kind":"person","name":"Mills Kenneth T.","position":1,"cik":"0001652824","reported_name":"Mills Kenneth T.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-01-27T21:19:10.000Z","date":"2021-01-25","kind":"sale","acquired":false,"shares":315,"price":42.64,"value":13431.6,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was effected pursuant to a Rule 10b5-1 trading plan."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades at prices ranging from $42.49 to $42.72. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."}],"balance_after":287169,"source":{"system":"sec-edgar","filing":"0001562180-21-000562","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1652824/000156218021000562/primarydocument.xml","form_type":"4"}},{"id":2893497,"issuer":{"id":2211,"kind":"organization","name":"REGENXBIO Inc.","symbol":"RGNX"},"owners":[{"id":42388,"kind":"person","name":"Mills Kenneth T.","position":1,"cik":"0001652824","reported_name":"Mills Kenneth T.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-01-27T21:19:10.000Z","date":"2021-01-25","kind":"exercise","acquired":true,"shares":6500,"price":0.85,"value":5525.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was effected pursuant to a Rule 10b5-1 trading plan."}],"balance_after":287484,"source":{"system":"sec-edgar","filing":"0001562180-21-000562","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1652824/000156218021000562/primarydocument.xml","form_type":"4"}},{"id":2911024,"issuer":{"id":2211,"kind":"organization","name":"REGENXBIO Inc.","symbol":"RGNX"},"owners":[{"id":42388,"kind":"person","name":"Mills Kenneth T.","position":1,"cik":"0001652824","reported_name":"Mills Kenneth T.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Employee Stock Option (Right to Buy)","published_at":"2021-01-11T21:27:43.000Z","date":"2021-01-07","kind":"exercise","acquired":false,"shares":1500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was effected pursuant to a Rule 10b5-1 trading plan."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The previously granted option, representing a right to purchase a total of 708,200 shares, became exercisable as follows: 474,490 of the shares subject to the option are initial shares (\"Initial Shares\") and 233,710 of the shares subject to the option are contingent shares (\"Contingent Shares\"). 120,394 of the Initial Shares vested on September 17, 2014, 88,524 of the Initial Shares vested on September 17, 2015 and an additional 7,377 of the Initial Shares vested upon each month of continuous service to the Company thereafter. 25% of the Contingent Shares were deemed vested as of September 17, 2014 on January 13, 2015 due to a subsequent event. The remainder of the Contingent Shares vested over four years of service following September 17, 2014, with 25% of the remaining 75% of Contingent Shares having vested on September 17, 2015 and the remaining Contingent Shares having vested in 36 equal monthly installments thereafter."}],"balance_after":47670,"derivative":{"exercise_price":0.85,"expiration_date":"2024-09-23","underlying":"Common Stock","underlying_shares":1500},"source":{"system":"sec-edgar","filing":"0001562180-21-000282","document":"primarydocument.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1652824/000156218021000282/primarydocument.xml","form_type":"4"}},{"id":2911023,"issuer":{"id":2211,"kind":"organization","name":"REGENXBIO Inc.","symbol":"RGNX"},"owners":[{"id":42388,"kind":"person","name":"Mills Kenneth T.","position":1,"cik":"0001652824","reported_name":"Mills Kenneth T.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-01-11T21:27:43.000Z","date":"2021-01-07","kind":"sale","acquired":false,"shares":1500,"price":50.01,"value":75015.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was effected pursuant to a Rule 10b5-1 trading plan."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades at prices ranging from $50.00 to $50.095. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."}],"balance_after":281984,"source":{"system":"sec-edgar","filing":"0001562180-21-000282","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1652824/000156218021000282/primarydocument.xml","form_type":"4"}},{"id":2911022,"issuer":{"id":2211,"kind":"organization","name":"REGENXBIO Inc.","symbol":"RGNX"},"owners":[{"id":42388,"kind":"person","name":"Mills Kenneth T.","position":1,"cik":"0001652824","reported_name":"Mills Kenneth T.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-01-11T21:27:43.000Z","date":"2021-01-07","kind":"exercise","acquired":true,"shares":1500,"price":0.85,"value":1275.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was effected pursuant to a Rule 10b5-1 trading plan."}],"balance_after":283484,"source":{"system":"sec-edgar","filing":"0001562180-21-000282","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1652824/000156218021000282/primarydocument.xml","form_type":"4"}},{"id":2915775,"issuer":{"id":2211,"kind":"organization","name":"REGENXBIO Inc.","symbol":"RGNX"},"owners":[{"id":42388,"kind":"person","name":"Mills Kenneth T.","position":1,"cik":"0001652824","reported_name":"Mills Kenneth T.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Stock Option (Right to Buy)","published_at":"2021-01-06T13:49:53.000Z","date":"2021-01-04","kind":"grant","acquired":true,"shares":185167,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"25% of the shares subject to this option shall vest after 12 months of continuous service with the Issuer. The balance will vest in equal monthly installments over the 36 months following January 4, 2022 while the optionee provides continuous service to the Issuer."}],"balance_after":185167,"derivative":{"exercise_price":44.97,"expiration_date":"2031-01-04","underlying":"Common Stock","underlying_shares":185167},"source":{"system":"sec-edgar","filing":"0001562180-21-000139","document":"primarydocument.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1652824/000156218021000139/primarydocument.xml","form_type":"4"}},{"id":2915774,"issuer":{"id":2211,"kind":"organization","name":"REGENXBIO Inc.","symbol":"RGNX"},"owners":[{"id":42388,"kind":"person","name":"Mills Kenneth T.","position":1,"cik":"0001652824","reported_name":"Mills Kenneth T.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-01-06T13:49:53.000Z","date":"2021-01-04","kind":"grant","acquired":true,"shares":40984,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares of common stock underlying a time-based restricted stock unit award (RSU). 25% of the shares subject to this RSU will vest on each of January 1, 2022, January 1, 2023, January 1, 2024 and January 1, 2025 while the recipient provides continuous service to the Issuer."}],"balance_after":281984,"source":{"system":"sec-edgar","filing":"0001562180-21-000139","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1652824/000156218021000139/primarydocument.xml","form_type":"4"}},{"id":2928828,"issuer":{"id":2211,"kind":"organization","name":"REGENXBIO Inc.","symbol":"RGNX"},"owners":[{"id":42388,"kind":"person","name":"Mills Kenneth T.","position":1,"cik":"0001652824","reported_name":"Mills Kenneth T.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Employee Stock Option (Right to Buy)","published_at":"2020-12-30T21:23:26.000Z","date":"2020-12-28","kind":"exercise","acquired":false,"shares":6500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was effected pursuant to a Rule 10b5-1 trading plan."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The previously granted option, representing a right to purchase a total of 708,200 shares, became exercisable as follows: 474,490 of the shares subject to the option are initial shares (\"Initial Shares\") and 233,710 of the shares subject to the option are contingent shares (\"Contingent Shares\"). 120,394 of the Initial Shares vested on September 17, 2014, 88,524 of the Initial Shares vested on September 17, 2015 and an additional 7,377 of the Initial Shares vested upon each month of continuous service to the Company thereafter. 25% of the Contingent Shares were deemed vested as of September 17, 2014 on January 13, 2015 due to a subsequent event. The remainder of the Contingent Shares vested over four years of service following September 17, 2014, with 25% of the remaining 75% of Contingent Shares having vested on September 17, 2015 and the remaining Contingent Shares having vested in 36 equal monthly installments thereafter."}],"balance_after":49170,"derivative":{"exercise_price":0.85,"expiration_date":"2024-09-23","underlying":"Common Stock","underlying_shares":6500},"source":{"system":"sec-edgar","filing":"0001562180-20-007506","document":"primarydocument.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1652824/000156218020007506/primarydocument.xml","form_type":"4"}},{"id":2928827,"issuer":{"id":2211,"kind":"organization","name":"REGENXBIO Inc.","symbol":"RGNX"},"owners":[{"id":42388,"kind":"person","name":"Mills Kenneth T.","position":1,"cik":"0001652824","reported_name":"Mills Kenneth T.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2020-12-30T21:23:26.000Z","date":"2020-12-28","kind":"sale","acquired":false,"shares":1853,"price":49.16,"value":91093.48,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was effected pursuant to a Rule 10b5-1 trading plan."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"This transaction was executed in multiple trades at prices ranging from $48.87 to $49.62. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."}],"balance_after":241000,"source":{"system":"sec-edgar","filing":"0001562180-20-007506","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1652824/000156218020007506/primarydocument.xml","form_type":"4"}},{"id":2928826,"issuer":{"id":2211,"kind":"organization","name":"REGENXBIO Inc.","symbol":"RGNX"},"owners":[{"id":42388,"kind":"person","name":"Mills Kenneth T.","position":1,"cik":"0001652824","reported_name":"Mills Kenneth T.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2020-12-30T21:23:26.000Z","date":"2020-12-28","kind":"sale","acquired":false,"shares":4647,"price":48.47,"value":225240.09,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was effected pursuant to a Rule 10b5-1 trading plan."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades at prices ranging from $47.87 to $48.86. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."}],"balance_after":242853,"source":{"system":"sec-edgar","filing":"0001562180-20-007506","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1652824/000156218020007506/primarydocument.xml","form_type":"4"}},{"id":2928825,"issuer":{"id":2211,"kind":"organization","name":"REGENXBIO Inc.","symbol":"RGNX"},"owners":[{"id":42388,"kind":"person","name":"Mills Kenneth T.","position":1,"cik":"0001652824","reported_name":"Mills Kenneth T.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2020-12-30T21:23:26.000Z","date":"2020-12-28","kind":"exercise","acquired":true,"shares":6500,"price":0.85,"value":5525.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was effected pursuant to a Rule 10b5-1 trading plan."}],"balance_after":247500,"source":{"system":"sec-edgar","filing":"0001562180-20-007506","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1652824/000156218020007506/primarydocument.xml","form_type":"4"}},{"id":2931323,"issuer":{"id":2211,"kind":"organization","name":"REGENXBIO Inc.","symbol":"RGNX"},"owners":[{"id":42388,"kind":"person","name":"Mills Kenneth T.","position":1,"cik":"0001652824","reported_name":"Mills Kenneth T.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Employee Stock Option (Right to Buy)","published_at":"2020-12-28T21:17:57.000Z","date":"2020-12-23","kind":"exercise","acquired":false,"shares":4500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was effected pursuant to a Rule 10b5-1 trading plan."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The previously granted option, representing a right to purchase a total of 708,200 shares, became exercisable as follows: 474,490 of the shares subject to the option are initial shares (\"Initial Shares\") and 233,710 of the shares subject to the option are contingent shares (\"Contingent Shares\"). 120,394 of the Initial Shares vested on September 17, 2014, 88,524 of the Initial Shares vested on September 17, 2015 and an additional 7,377 of the Initial Shares vested upon each month of continuous service to the Company thereafter. 25% of the Contingent Shares were deemed vested as of September 17, 2014 on January 13, 2015 due to a subsequent event. 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