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DYN - Dyne Therapeutics, Inc.

Insider Purchase by Posner Brian S (Dir)

1 Month
After Trade
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Trade Summary

6 days ago, Posner Brian S, serving as Dir at Dyne Therapeutics, Inc. (DYN), purchased 2,000 shares at $17.08 per share, for a total transaction value of $34,160.00. Following this transaction, Posner Brian S now holds 15,500 shares of DYN.

This purchase represents a 15.00% increase in Posner Brian S's stake in the company. This is considered a high-conviction trade given the significant change in ownership.

The trade was executed on Monday, March 30, 2026 and publicly disclosed via SEC Form 4 filing on Wednesday, April 1, 2026, 2 days after the trade was made.

Dyne Therapeutics, Inc. operates in the HEALTHCARE sector, specifically within the BIOTECHNOLOGY industry. Insider buying activity in this sector can provide valuable signals about industry trends and company-specific developments.

Posner Brian S

Dir

Brian S. Posner (age 63) is an independent director of Arch Capital Group Ltd. (ACGL) since November 2010, currently serving as Chair of the Finance, Investment and Risk Committee and a member of the Compensation and Human Capital Committee.[[1]](https://fintool.com/app/research/companies/ACGL/people/brian-s-posner)[[2]](https://theorg.com/org/arch-capital-group/org-chart/brian-s-posner)[[6]](https://www.archgroup.com/about/board-of-directors/) He recently sold 3,000 shares of ACGL on March 11, 2026, reducing his holdings significantly.[[4]](https://www.gurufocus.com/news/8704785/insider-sell-brian-posner-sells-3000-shares-of-arch-capital-group-ltd-acgl)[[5]](https://www.marketbeat.com/instant-alerts/arch-capital-group-nasdaqacgl-director-sells-5133000-in-stock-2026-03-12/) Posner brings over 35 years of investment management and leadership experience, including roles as President, CEO, and Co-Chief Investment Officer at ClearBridge Advisors (2005–2008), Co-founder and Managing Member of Hygrove Partners LLC (2000–2005), Portfolio Manager and Co-CIO at Warburg Pincus/Credit Suisse Asset Management (1997–1999), and Portfolio Manager at Fidelity Investments (1987–1996).[[1]](https://fintool.com/app/research/companies/ACGL/people/brian-s-posner)[[2]](https://theorg.com/org/arch-capital-group/org-chart/brian-s-posner)[[3]](https://www.point-rider.com/posner) He is the founder and Managing Member of Point Rider Group LLC, a consultancy advising boards, executives, and private equity on financial services, technology, and biopharma, and serves on boards including Dyne Therapeutics.[[1]](https://fintool.com/app/research/companies/ACGL/people/brian-s-posner)[[3]](https://www.point-rider.com/posner)[[6]](https://www.archgroup.com/about/board-of-directors/) Posner holds a B.A. from Northwestern University and an M.B.A. from the University of Chicago Booth School of Business.[[1]](https://fintool.com/app/research/companies/ACGL/people/brian-s-posner)[[2]](https://theorg.com/org/arch-capital-group/org-chart/brian-s-posner)

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Trade Price

$17.08

Quantity

2,000

Total Value

$34,160.00

Shares Owned

15,500

Trade Date

Monday, March 30, 2026

6 days ago

SEC Filing Date

Wednesday, April 1, 2026

Filed 2 days after trade

HEALTHCAREBIOTECHNOLOGY

About Dyne Therapeutics, Inc.

Company Overview

No company information available
View news mentioning DYN

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