Brian S Posner

DYN

Brian S Posner serves as director at Dyne Therapeutics, Inc. (DYN). This page tracks their complete SEC Form 4 insider trading history including stock purchases and sales.

Total Buys

10 trades

$365.8K

Total Sells

3 trades

$249.7K

Net Position

Net Buyer

$116.2K

Companies Traded

DYN, ACGL, BIIB

Active Period

Jun 2021 – Jun 2026

13 total trades

Most Recent

Buy DYN

Jun 9, 2026 · $33.9K

Brian S Posner's Insider Trading at Dyne Therapeutics, Inc. (DYN)

Buys

7 · $274.8K

Sells

0 · $0.00

Total Shares Bought

16,000

Total Shares Sold

DYN Price Chart

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Date	Type	Shares	Avg Price	Value	Shares After
Jun 9, 2026	Buy	2,000	$16.94	$33.9K	24,500
Jun 5, 2026	Buy	2,500	$17.48	$43.7K	22,500
May 28, 2026	Buy	2,000	$18.21	$36.4K	20,000
May 22, 2026	Buy	2,500	$17.12	$42.8K	18,000
Apr 1, 2026	Buy	2,000	$17.08	$34.2K	15,500
Mar 13, 2026	Buy	2,000	$19.35	$38.7K	13,500
Mar 10, 2026	Buy	3,000	$15.06	$45.2K	11,500

Brian S Posner's Insider Trading at Arch Capital Group Ltd. (ACGL)

Buys

3 · $91.0K

Sells

2 · $151.0K

Total Shares Bought

5,000

Total Shares Sold

6,000

ACGL Price Chart

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Date	Type	Shares	Avg Price	Value
Aug 1, 2025	Buy	1,000	$17.34	$17.3K
Oct 28, 2022	Buy	2,000	$17.60	$35.2K
Apr 29, 2022	Buy	2,000	$19.23	$38.5K
Sep 30, 2021	Sell	2,000	$25.00	$50.0K
Jun 14, 2021	Sell	4,000	$25.24	$101.0K