T. Rowe Price Investment Management, Inc.

Holdings History for Dyne Therapeutics, Inc. - COMMON STOCK (DYN)

Symbol: DYN on Nasdaq
Investment type: Equity / COMMON STOCK
Latest Disclosed Shares Owned: 26,578,437 shares
Security Ownership %: 16%

Shares, Excluding Options vs Price

Value, Excluding Options

T. Rowe Price Investment Management, Inc. ownership in Dyne Therapeutics, Inc. COMMON STOCK (DYN)

06 Mar 2026 - T. Rowe Price Investment Management, Inc. has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 26,578,437 shares of Dyne Therapeutics, Inc. COMMON STOCK (DYN). This represents 16% ownership of the company. In their previous filing dated 08 Jan 2026, T. Rowe Price Investment Management, Inc. had reported owning 17,540,089 shares, indicating an increase of +52%. .

Reporting Name	Ownership %	Change	Value $	Shares owned	Change	Activity %	Price	Form	Report date	Filing time
T. Rowe Price Investment Management, Inc.	16%	+50%	$425,254,992	26,578,437	+9,038,348	+52%	$16.00	13G/A	28 Feb 2026	06 Mar 2026, 12:57
T. Rowe Price Investment Management, Inc.	11%		$343,082,387	17,540,089			$19.56	13G	31 Dec 2025	08 Jan 2026, 12:15

Holdings date	Weight	Change	Value $	Shares	Change	Activity %	Price	All Holders
31 Dec 2025	0.22%	+0.31%	$343,085,000	17,540,089	+14,727,667	+524%	$19.56	Q4 2025
30 Sep 2025	0.02%	+0.01%	$35,578,000	2,812,422	+1,018,832	+57%	$12.65	Q3 2025
30 Jun 2025	0.01%	+0%	$17,075,000	1,793,590	+625,615	+54%	$9.52	Q2 2025
31 Mar 2025	0.01%	+0.01%	$12,218,000	1,167,975	+1,167,975	NEW	$10.46	Q1 2025

* Reported Price is the price of the security as of the portfolio date. This value is significant in that it is the last known price at which the security was still held.
An asterisk sign (*) next to the price indicates that the price is likely invalid.