Insider Trading activities at Generation Bio Co. (GBIO)

Insider trading activities (stock purchases, sales, and option exercises) reported by insiders of Generation Bio Co. (GBIO) since 2020 are shown in Table 1 and Table 2. Table 1 shows the monthly insider trading data of Generation Bio Co.. Table 2 shows the detailed insider transactions. This company's CIK number is 1733294.

Total stock buying since 2020: $72,270,367.
Total stock sales since 2020: $43,261,272.
Total stock option exercises since 2020: $525,827.

Table 1. Yearly summary of insider stock purchases, sales, and option exercises at *Generation Bio Co.* (*GBIO*).
	Insider Buying		Insider Sales		Option Exercises
Year	Shares	Value	Shares	Value	Shares	Value
2025	210,791	$203,209	0	$0	23,894	$0
2024	0	$0	4,890	$7,920	174,778	$0
2023	551,455	$778,994	8,725	$43,778	250,767	$0
2022	404,949	$2,193,184	38,012	$201,150	176,070	$0
2021	24,489	$599,980	1,580,139	$42,422,148	150,241	$457,636
2020	3,605,000	$68,495,000	15,841	$586,276	78,401	$68,191

Table 2. Monthly summary of insider trading at *Generation Bio Co.* (*GBIO*).
Trading Period	Insider Buying		Insider Sales		Option Exercises
year-month	Shares	Value	Shares	Value	Shares	Value
2025-04	0	$0	0	$0	11,947	$0
2025-01	210,791	$203,209	0	$0	11,947	$0
2024-07	0	$0	0	$0	16,381	$0
2024-04	0	$0	0	$0	26,422	$0
2024-01	0	$0	4,890	$7,920	131,975	$0
2023-12	551,455	$778,994	0	$0	0	$0
2023-10	0	$0	0	$0	63,109	$0
2023-08	0	$0	3,116	$15,361	0	$0
2023-07	0	$0	0	$0	64,783	$0
2023-04	0	$0	2,914	$13,433	61,435	$0
2023-01	0	$0	2,695	$14,984	61,440	$0
2022-10	0	$0	2,914	$14,657	61,440	$0
2022-09	394,530	$2,143,928	35,098	$186,493	0	$0
2022-07	0	$0	0	$0	114,630	$0
2022-03	10,419	$49,256	0	$0	0	$0
2021-09	0	$0	439,672	$11,368,956	7,500	$34,425
2021-08	0	$0	3,000	$72,424	3,000	$13,770
2021-07	0	$0	6,518	$163,483	6,518	$31,922
2021-06	0	$0	433,672	$10,955,426	1,500	$6,885
2021-05	0	$0	21,500	$729,464	11,500	$17,673
2021-04	0	$0	572,626	$15,733,016	27,072	$90,386
2021-03	0	$0	37,267	$1,329,857	27,267	$83,260
2021-02	0	$0	24,167	$820,863	24,167	$69,430
2021-01	24,489	$599,980	41,717	$1,248,659	41,717	$109,885

Table 3. Detailed insider trading at *Generation Bio Co.* (*GBIO*)
Trade Date	Insider Name	Trade Type	Shares	Price ($)	Value ($)
2025-04-15	Conway Kevin John (Chief Financial Officer)	Option Ex	587	.00	0
2025-04-15	Samayoa Phillip (CHIEF SCIENTIFIC OFFICER)	Option Ex	1,147	.00	0
2025-04-15	Paone Antoinette (CHIEF OPERATING OFFICER)	Option Ex	1,592	.00	0
2025-04-15	Howze Yalonda (CHIEF LEGAL OFFICER)	Option Ex	3,347	.00	0
2025-04-15	Mcdonough Geoff (PRESIDENT AND CEO)	Option Ex	5,274	.00	0
2025-01-15	Conway Kevin John (Chief Financial Officer)	Option Ex	587	.00	0
2025-01-15	Samayoa Phillip (CHIEF SCIENTIFIC OFFICER)	Option Ex	1,147	.00	0
2025-01-15	Paone Antoinette (CHIEF OPERATING OFFICER)	Option Ex	1,592	.00	0
2025-01-15	Howze Yalonda (CHIEF LEGAL OFFICER)	Option Ex	3,347	.00	0
2025-01-15	Mcdonough Geoff (PRESIDENT AND CEO)	Option Ex	5,274	.00	0
2025-01-13	Quinn Anthony G.	Buy	85,000	.97	82,450
2025-01-10	Quinn Anthony G.	Buy	125,791	.96	120,759
2024-07-15	Samayoa Phillip (CHIEF STRATEGY OFFICER)	Option Ex	1,147	.00	0
2024-07-15	Paone Antoinette (CHIEF OPERATING OFFICER)	Option Ex	1,592	.00	0
2024-07-15	Howze Yalonda (CHIEF LEGAL OFFICER)	Option Ex	3,347	.00	0
2024-07-15	Norkunas Matthew (CHIEF FINANCIAL OFFICER)	Option Ex	3,347	.00	0
2024-07-15	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Option Ex	1,674	.00	0
2024-07-15	Mcdonough Geoff (PRESIDENT AND CEO)	Option Ex	5,274	.00	0
2024-04-15	Samayoa Phillip (CHIEF STRATEGY OFFICER)	Option Ex	1,147	.00	0
2024-04-15	Paone Antoinette (CHIEF OPERATING OFFICER)	Option Ex	1,592	.00	0
2024-04-15	Howze Yalonda (CHIEF LEGAL OFFICER)	Option Ex	13,388	.00	0
2024-04-15	Norkunas Matthew (CHIEF FINANCIAL OFFICER)	Option Ex	3,347	.00	0
2024-04-15	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Option Ex	1,674	.00	0
2024-04-15	Mcdonough Geoff (PRESIDENT AND CEO)	Option Ex	5,274	.00	0
2024-01-29	Zimmermann Tracy (CHIEF DEVELOPMENT OFFICER)	Option Ex	5,021	.00	0
2024-01-29	Kerr Douglas (CHIEF MEDICAL OFFICER)	Option Ex	5,021	.00	0
2024-01-15	Samayoa Phillip (CHIEF STRATEGY OFFICER)	Option Ex	8,712	.00	0
2024-01-15	Paone Antoinette (CHIEF OPERATING OFFICER)	Option Ex	10,492	.00	0
2024-01-15	Zimmermann Tracy (CHIEF DEVELOPMENT OFFICER)	Option Ex	14,131	.00	0
2024-01-15	Norkunas Matthew (CHIEF FINANCIAL OFFICER)	Option Ex	15,805	.00	0
2024-01-15	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Option Ex	14,131	.00	0
2024-01-15	Kerr Douglas (CHIEF MEDICAL OFFICER)	Option Ex	14,131	.00	0
2024-01-15	Mcdonough Geoff (PRESIDENT AND CEO)	Option Ex	44,531	.00	0
2024-01-02	Samayoa Phillip (CHIEF STRATEGY OFFICER)	Sale	2,445	1.62	3,960
2024-01-02	Paone Antoinette (CHIEF OPERATING OFFICER)	Sale	2,445	1.62	3,960
2023-12-08	Appelhans Dannielle	Buy	8,000	1.80	14,440
2023-12-04	Appelhans Dannielle	Buy	12,000	1.50	18,000
2023-12-04	Rowland Charles A Jr	Buy	150,000	1.50	225,000
2023-12-01	Nicholson Donald William	Buy	100,000	1.44	144,000
2023-12-01	Quinn Anthony G.	Buy	88,495	1.41	124,777
2023-12-01	Rowland Charles A Jr	Buy	192,960	1.31	252,777
2023-10-15	Samayoa Phillip (CHIEF STRATEGY OFFICER)	Option Ex	4,125	.00	0
2023-10-15	Paone Antoinette (CHIEF OPERATING OFFICER)	Option Ex	4,125	.00	0
2023-10-15	Zimmermann Tracy (CHIEF DEVELOPMENT OFFICER)	Option Ex	7,437	.00	0
2023-10-15	Norkunas Matthew (CHIEF FINANCIAL OFFICER)	Option Ex	9,111	.00	0
2023-10-15	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Option Ex	7,437	.00	0
2023-10-15	Kerr Douglas (CHIEF MEDICAL OFFICER)	Option Ex	7,437	.00	0
2023-10-15	Mcdonough Geoff (PRESIDENT AND CEO)	Option Ex	23,437	.00	0
2023-08-23	Paone Antoinette (CHIEF OPERATING OFFICER)	Sale	3,116	4.93	15,361
2023-07-15	Samayoa Phillip (CHIEF STRATEGY OFFICER)	Option Ex	4,125	.00	0
2023-07-15	Paone Antoinette (CHIEF OPERATING OFFICER)	Option Ex	4,125	.00	0
2023-07-15	Zimmermann Tracy (CHIEF DEVELOPMENT OFFICER)	Option Ex	7,437	.00	0
2023-07-15	Norkunas Matthew (CHIEF FINANCIAL OFFICER)	Option Ex	10,785	.00	0
2023-07-15	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Option Ex	7,437	.00	0
2023-07-15	Kerr Douglas (CHIEF MEDICAL OFFICER)	Option Ex	7,437	.00	0
2023-07-15	Mcdonough Geoff (PRESIDENT AND CEO)	Option Ex	23,437	.00	0
2023-04-25	Paone Antoinette (CHIEF OPERATING OFFICER)	Sale	2,914	4.61	13,433
2023-04-15	Samayoa Phillip (CHIEF STRATEGY OFFICER)	Option Ex	4,125	.00	0
2023-04-15	Paone Antoinette (CHIEF OPERATING OFFICER)	Option Ex	4,125	.00	0
2023-04-15	Zimmermann Tracy (CHIEF DEVELOPMENT OFFICER)	Option Ex	7,437	.00	0
2023-04-15	Norkunas Matthew (CHIEF FINANCIAL OFFICER)	Option Ex	7,437	.00	0
2023-04-15	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Option Ex	7,437	.00	0
2023-04-15	Kerr Douglas (CHIEF MEDICAL OFFICER)	Option Ex	7,437	.00	0
2023-04-15	Mcdonough Geoff (PRESIDENT AND CEO)	Option Ex	23,437	.00	0
2023-01-26	Paone Antoinette (CHIEF OPERATING OFFICER)	Sale	2,695	5.56	14,984
2023-01-15	Samayoa Phillip (CHIEF STRATEGY OFFICER)	Option Ex	4,125	.00	0
2023-01-15	Paone Antoinette (CHIEF OPERATING OFFICER)	Option Ex	4,125	.00	0
2023-01-15	Zimmermann Tracy (CHIEF DEVELOPMENT OFFICER)	Option Ex	7,438	.00	0
2023-01-15	Norkunas Matthew (CHIEF FINANCIAL OFFICER)	Option Ex	7,438	.00	0
2023-01-15	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Option Ex	7,438	.00	0
2023-01-15	Kerr Douglas (CHIEF MEDICAL OFFICER)	Option Ex	7,438	.00	0
2023-01-15	Mcdonough Geoff (PRESIDENT AND CEO)	Option Ex	23,438	.00	0
2022-10-27	Paone Antoinette (CHIEF OPERATING OFFICER)	Sale	2,914	5.03	14,657
2022-10-15	Samayoa Phillip (CHIEF STRATEGY OFFICER)	Option Ex	4,125	.00	0
2022-10-15	Paone Antoinette (CHIEF OPERATING OFFICER)	Option Ex	4,125	.00	0
2022-10-15	Zimmermann Tracy (CHIEF DEVELOPMENT OFFICER)	Option Ex	7,438	.00	0
2022-10-15	Norkunas Matthew (CHIEF FINANCIAL OFFICER)	Option Ex	7,438	.00	0
2022-10-15	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Option Ex	7,438	.00	0
2022-10-15	Kerr Douglas (CHIEF MEDICAL OFFICER)	Option Ex	7,438	.00	0
2022-10-15	Mcdonough Geoff (PRESIDENT AND CEO)	Option Ex	23,438	.00	0
2022-09-29	Paone Antoinette (CHIEF OPERATING OFFICER)	Sale	2,828	5.24	14,818
2022-09-19	Rowland Charles A Jr	Buy	15,750	5.26	82,845
2022-09-16	Rowland Charles A Jr	Buy	133,924	5.48	733,900
2022-09-15	Paone Antoinette (CHIEF OPERATING OFFICER)	Sale	18,440	5.32	98,100
2022-09-15	Rowland Charles A Jr	Buy	68,588	5.41	371,060
2022-09-14	Rowland Charles A Jr	Buy	5,600	5.29	29,652
2022-09-13	Rowland Charles A Jr	Buy	18,784	5.20	97,751
2022-07-15	Paone Antoinette (CHIEF OPERATING OFFICER)	Option Ex	8,250	.00	0
2022-07-15	Zimmermann Tracy (CHIEF DEVELOPMENT OFFICER)	Option Ex	14,876	.00	0
2022-07-15	Norkunas Matthew (CHIEF FINANCIAL OFFICER)	Option Ex	14,876	.00	0
2022-07-15	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Option Ex	14,876	.00	0
2022-07-15	Kerr Douglas (CHIEF MEDICAL OFFICER)	Option Ex	14,876	.00	0
2022-07-15	Mcdonough Geoff (PRESIDENT AND CEO)	Option Ex	46,876	.00	0
2022-03-10	Nicholson Donald William	Buy	8,126	4.71	38,273
2022-03-09	Nicholson Donald William	Buy	2,293	4.79	10,983
2021-09-29	Atlas Venture Associates Opportunity I, Llc (10% Owner)	Sale	16,586	24.59	407,849
2021-09-29	Rhodes Jason P (Director)	Sale	16,586	24.59	407,849
2021-09-28	Atlas Venture Associates Opportunity I, Llc (10% Owner)	Sale	13,113	25.24	330,972
2021-09-28	Rhodes Jason P (Director)	Sale	13,113	25.24	330,972
2021-09-27	Atlas Venture Associates Opportunity I, Llc (10% Owner)	Sale	51,389	25.70	1,320,697
2021-09-27	Rhodes Jason P (Director)	Sale	51,389	25.70	1,320,697
2021-09-24	Atlas Venture Associates Opportunity I, Llc (10% Owner)	Sale	28,916	25.84	747,160
2021-09-24	Rhodes Jason P (Director)	Sale	28,916	25.84	747,160
2021-09-23	Atlas Venture Associates Opportunity I, Llc (10% Owner)	Sale	75,465	26.27	1,982,616
2021-09-23	Rhodes Jason P (Director)	Sale	75,465	26.27	1,982,616
2021-09-22	Atlas Venture Associates Opportunity I, Llc (10% Owner)	Sale	30,617	25.89	792,704
2021-09-22	Rhodes Jason P (Director)	Sale	30,617	25.89	792,704
2021-09-14	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Sale	4,500	28.07	126,315
2021-09-14	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Option Ex	4,500	4.59	20,655
2021-09-10	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Sale	3,000	26.21	78,645
2021-09-10	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Option Ex	3,000	4.59	13,770
2021-08-23	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Sale	1,500	25.04	37,560
2021-08-23	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Option Ex	1,500	4.59	6,885
2021-08-10	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Sale	1,500	23.24	34,864
2021-08-10	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Option Ex	1,500	4.59	6,885
2021-07-12	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Sale	3,000	24.95	74,865
2021-07-12	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Option Ex	3,000	4.59	13,770
2021-07-08	Kerr Douglas (CHIEF MEDICAL OFFICER)	Sale	3,518	25.19	88,618
2021-07-08	Kerr Douglas (CHIEF MEDICAL OFFICER)	Option Ex	3,518	5.16	18,152
2021-06-24	Atlas Venture Associates Opportunity I, Llc (10% Owner)	Sale	31,008	26.08	808,688
2021-06-24	Rhodes Jason P (Director)	Sale	31,008	26.08	808,688
2021-06-23	Atlas Venture Associates Opportunity I, Llc (10% Owner)	Sale	62,609	25.39	1,589,329
2021-06-23	Rhodes Jason P (Director)	Sale	62,609	25.39	1,589,329
2021-06-22	Atlas Venture Associates Opportunity I, Llc (10% Owner)	Sale	58,577	24.98	1,463,253
2021-06-22	Rhodes Jason P (Director)	Sale	58,577	24.98	1,463,253
2021-06-21	Atlas Venture Associates Opportunity I, Llc (10% Owner)	Sale	63,892	24.97	1,595,383
2021-06-21	Rhodes Jason P (Director)	Sale	63,892	24.97	1,595,383
2021-06-15	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Sale	1,500	28.08	42,120
2021-06-15	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Option Ex	1,500	4.59	6,885
2021-05-11	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Sale	400	31.05	12,420
2021-05-11	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Option Ex	400	2.60	1,038
2021-05-10	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Sale	8,600	31.20	268,294
2021-05-10	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Option Ex	8,600	.60	5,160
2021-05-03	Zimmermann Tracy (CHIEF DEVELOPMENT OFFICER)	Sale	2,500	35.92	89,800
2021-05-03	Zimmermann Tracy (CHIEF DEVELOPMENT OFFICER)	Option Ex	2,500	4.59	11,475
2021-05-03	Mcdonough Geoff (PRESIDENT AND CEO)	Sale	10,000	35.90	358,950
2021-04-23	Mcdonough Geoff (PRESIDENT AND CEO)	Sale	10,000	35.10	351,000
2021-04-22	Zimmermann Tracy (CHIEF DEVELOPMENT OFFICER)	Sale	2,500	33.32	83,300
2021-04-22	Zimmermann Tracy (CHIEF DEVELOPMENT OFFICER)	Option Ex	2,500	4.59	11,475
2021-04-22	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Sale	1,500	34.03	51,045
2021-04-22	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Option Ex	1,500	.60	900
2021-04-21	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Sale	1,500	31.07	46,605
2021-04-21	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Option Ex	1,500	.60	900
2021-04-16	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Sale	1,500	28.03	42,045
2021-04-16	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Option Ex	1,500	.60	900
2021-04-14	Atlas Venture Associates X, Llc (10% Owner)	Sale	23,413	26.59	622,551
2021-04-14	Rhodes Jason P (Director)	Sale	23,413	26.59	622,551
2021-04-13	Atlas Venture Associates X, Llc (10% Owner)	Sale	43,145	25.31	1,091,999
2021-04-13	Rhodes Jason P (Director)	Sale	43,145	25.31	1,091,999
2021-04-12	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Sale	6,000	26.45	158,700
2021-04-12	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Option Ex	6,000	.60	3,600
2021-04-12	Atlas Venture Associates X, Llc (10% Owner)	Sale	74,124	26.34	1,952,426
2021-04-12	Rhodes Jason P (Director)	Sale	74,124	26.34	1,952,426
2021-04-09	Atlas Venture Associates X, Llc (10% Owner)	Sale	43,681	27.96	1,221,320
2021-04-09	Rhodes Jason P (Director)	Sale	43,681	27.96	1,221,320
2021-04-08	Atlas Venture Associates X, Llc (10% Owner)	Sale	43,550	28.68	1,249,231
2021-04-08	Rhodes Jason P (Director)	Sale	43,550	28.68	1,249,231
2021-04-07	Atlas Venture Associates X, Llc (10% Owner)	Sale	39,864	28.84	1,149,478
2021-04-07	Rhodes Jason P (Director)	Sale	39,864	28.84	1,149,478
2021-04-05	Kerr Douglas (CHIEF MEDICAL OFFICER)	Sale	14,072	30.30	426,311
2021-04-05	Kerr Douglas (CHIEF MEDICAL OFFICER)	Option Ex	14,072	5.16	72,611
2021-03-10	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Sale	10,500	34.92	366,712
2021-03-10	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Option Ex	10,500	.60	6,300
2021-03-05	Kerr Douglas (CHIEF MEDICAL OFFICER)	Sale	11,267	32.79	369,456
2021-03-05	Kerr Douglas (CHIEF MEDICAL OFFICER)	Option Ex	11,267	4.59	51,715
2021-03-03	Zimmermann Tracy (CHIEF DEVELOPMENT OFFICER)	Sale	3,000	41.38	124,140
2021-03-03	Zimmermann Tracy (CHIEF DEVELOPMENT OFFICER)	Option Ex	3,000	4.59	13,770
2021-03-01	Zimmermann Tracy (CHIEF DEVELOPMENT OFFICER)	Sale	2,500	38.61	96,519
2021-03-01	Zimmermann Tracy (CHIEF DEVELOPMENT OFFICER)	Option Ex	2,500	4.59	11,475
2021-03-01	Mcdonough Geoff (PRESIDENT AND CEO)	Sale	10,000	37.30	373,030
2021-02-10	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Sale	10,400	34.64	360,287
2021-02-10	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Option Ex	10,400	.60	6,240
2021-02-08	Kerr Douglas (CHIEF MEDICAL OFFICER)	Sale	11,267	33.55	377,951
2021-02-08	Kerr Douglas (CHIEF MEDICAL OFFICER)	Option Ex	11,267	4.59	51,715
2021-02-02	Zimmermann Tracy (CHIEF DEVELOPMENT OFFICER)	Sale	2,500	33.05	82,625
2021-02-02	Zimmermann Tracy (CHIEF DEVELOPMENT OFFICER)	Option Ex	2,500	4.59	11,475
2021-01-15	Angelino Mark D. (CHIEF OPERATING OFFICER)	Sale	7,500	33.64	252,285
2021-01-15	Angelino Mark D. (CHIEF OPERATING OFFICER)	Option Ex	7,500	4.59	34,425
2021-01-14	Zimmermann Tracy (CHIEF DEVELOPMENT OFFICER)	Sale	2,500	33.09	82,725
2021-01-14	Zimmermann Tracy (CHIEF DEVELOPMENT OFFICER)	Option Ex	2,500	4.59	11,475
2021-01-14	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Sale	5,630	32.55	183,284
2021-01-14	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Option Ex	5,630	.60	3,378
2021-01-11	Nicholson Donald William	Buy	4,081	24.50	99,984
2021-01-11	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Sale	14,820	27.99	414,811
2021-01-11	Stanton Matthew (CHIEF SCIENTIFIC OFFICER)	Option Ex	14,820	.60	8,892
2021-01-11	Kerr Douglas (CHIEF MEDICAL OFFICER)	Sale	11,267	28.01	315,554
2021-01-11	Kerr Douglas (CHIEF MEDICAL OFFICER)	Option Ex	11,267	4.59	51,715
2021-01-11	Rowland Charles A Jr	Buy	20,408	24.50	499,996
2020-12-15	Angelino Mark D. (Chief Operating Officer)	Sale	5,301	35.20	186,568
2020-12-15	Angelino Mark D. (Chief Operating Officer)	Option Ex	5,301	4.59	24,331
2020-12-10	Stanton Matthew (Chief Scientific Officer)	Sale	10,540	37.92	399,708
2020-12-10	Stanton Matthew (Chief Scientific Officer)	Option Ex	10,540	.60	6,324
2020-08-14	Angelino Mark D. (Chief Operating Officer)	Option Ex	62,560	.60	37,536
2020-06-16	Wellington Biomedical Innovation Master Investors (cayman) I L.p. (10% Owner)	Buy	1,100,000	19.00	20,900,000
2020-06-16	Casdin Eli (10% Owner)	Buy	650,000	19.00	12,350,000
2020-06-16	Roberts Thomas G. Jr.	Buy	400,000	19.00	7,600,000
2020-06-16	Rowland Charles A Jr (Director)	Buy	30,000	19.00	570,000
2020-06-16	Invus Public Equities Advisors, Llc (10% Owner)	Buy	800,000	19.00	15,200,000
2020-06-16	Deerfield Partners, L.p.	Buy	225,000	19.00	4,275,000
2020-06-16	Wehrly Mark C	Buy	400,000	19.00	7,600,000

Insider trading activities including stock purchases, stock sales, and option exercises of GBIO listed in the above tables cannot be completely guaranteed as to their accuracy. For more insider trading information of Generation Bio Co. (symbol GBIO, CIK number 1733294) see the Securities and Exchange Commission (SEC) website.

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▪ Insider Officer Cluster Trading

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