1. Corporate Officers - K
2. Kerr Douglas

Insider Trading History of Kerr Douglas

The following table details the insider trading activities (stock purchases, stock sales, and stock option exercises) of Kerr Douglas since 2021. This trader's CIK number is 1814189. At the time of last reporting, Kerr Douglas was the Chief Medical Officer of Dyne Therapeutics, Inc.. (stock ticker symbol DYN). Also see all insider trading activities at Dyne Therapeutics, Inc..

Note that in the past Kerr Douglas also reported insider trading activities as an insider of the following companies:

Yearly summary of insider trading at Generation Bio Co. (GBIO) by Kerr Douglas

		Insider Buying		Insider Sales		Option Exercises
Year	Symbol	Shares	Value	Shares	Value	Shares	Value
2024	GBIO	0	$0	0	$0	19,152	$0
2023	GBIO	0	$0	0	$0	29,749	$0
2022	GBIO	0	$0	0	$0	22,314	$0
2021	GBIO	0	$0	51,391	$1,577,890	51,391	$245,908

Yearly summary of insider trading at Dyne Therapeutics, Inc. (DYN) by Kerr Douglas

		Insider Buying		Insider Sales		Option Exercises
Year	Symbol	Shares	Value	Shares	Value	Shares	Value
2025	DYN	0	$0	1,343	$15,887	0	$0

Insider trading activities at 2 companies by Kerr Douglas:

1. Generation Bio Co. (GBIO)

2. Dyne Therapeutics, Inc. (DYN)

Table 1. Insider trading of Generation Bio Co. (GBIO) by Kerr Douglas

Trade Date	Symbol	Trade Type	Shares	Price ($)	Value ($)
2024-01-29	GBIO	Option Ex	5,021	.00	0
2024-01-15	GBIO	Option Ex	14,131	.00	0
2023-10-15	GBIO	Option Ex	7,437	.00	0
2023-07-15	GBIO	Option Ex	7,437	.00	0
2023-04-15	GBIO	Option Ex	7,437	.00	0
2023-01-15	GBIO	Option Ex	7,438	.00	0
2022-10-15	GBIO	Option Ex	7,438	.00	0
2022-07-15	GBIO	Option Ex	14,876	.00	0
2021-07-08	GBIO	Option Ex	3,518	5.16	18,152
2021-07-08	GBIO	Sale	3,518	25.19	88,618
2021-04-05	GBIO	Option Ex	14,072	5.16	72,611
2021-04-05	GBIO	Sale	14,072	30.30	426,311
2021-03-05	GBIO	Option Ex	11,267	4.59	51,715
2021-03-05	GBIO	Sale	11,267	32.79	369,456
2021-02-08	GBIO	Option Ex	11,267	4.59	51,715
2021-02-08	GBIO	Sale	11,267	33.55	377,951
2021-01-11	GBIO	Option Ex	11,267	4.59	51,715
2021-01-11	GBIO	Sale	11,267	28.01	315,554

Table 2. Insider trading of Dyne Therapeutics, Inc. (DYN) by Kerr Douglas

Trade Date	Symbol	Trade Type	Shares	Price ($)	Value ($)
2025-03-05	DYN	Sale	1,343	11.83	15,887

Insider trading activities including stock purchases, stock sales, and option exercises listed in the above table cannot be completely guaranteed as to their accuracy. For more information regarding the trades made by Kerr Douglas (Chief Medical Officer of Dyne Therapeutics, Inc. at the time of this reporting) see the Securities and Exchange Commission (SEC) website.

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