RA CAPITAL MANAGEMENT, L.P.

Holdings History for Atrium Therapeutics, Inc. - Common Stock (RNA)

Symbol: RNA on Nasdaq
Investment type: Equity / Common Stock
Latest Disclosed Shares Owned: 8,641,031 shares
Security Ownership %: 5.9%

Shares, Excluding Options vs Price

Value, Excluding Options

RA Capital Management, L.P. ownership in Atrium Therapeutics, Inc. Common Stock (RNA)

14 Nov 2025 - RA Capital Management, L.P. has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 8,641,031 shares of Atrium Therapeutics, Inc. Common Stock (RNA). This represents 5.9% ownership of the company. This is the first filing by RA CAPITAL MANAGEMENT, L.P. disclosing ownership of Atrium Therapeutics, Inc. Common Stock (RNA).

Reporting Name	Ownership %	Change	Value $	Shares owned	Change	Activity %	Price	Form	Report date	Filing time
RA Capital Management, L.P.	5.9%		$376,489,721	8,641,031			$43.57	13G/A	30 Sep 2025	14 Nov 2025, 16:13

Holdings date	Weight	Change	Value $	Shares	Change	Activity %	Price	All Holders
31 Dec 2025	6.4%	0%	$623,277,566	8,641,031	0		$72.13	Q4 2025
30 Sep 2025	4.6%	+0.74%	$376,489,721	8,641,031	+1,375,000	+19%	$43.57	Q3 2025
30 Jun 2025	3.5%	+0.46%	$206,355,280	7,266,031	+965,623	+15%	$28.40	Q2 2025
31 Mar 2025	3.1%	0%	$185,988,044	6,300,408	0		$29.52	Q1 2025
31 Dec 2024	2.4%	0%	$183,215,865	6,300,408	0		$29.08	Q4 2024
30 Sep 2024	3.3%	+0.48%	$289,377,739	6,300,408	+900,000	+17%	$45.93	Q3 2024
30 Jun 2024	2.9%	+1.1%	$220,606,667	5,400,408	+2,118,228	+65%	$40.85	Q2 2024
31 Mar 2024	1.1%	+0.27%	$83,761,234	3,282,180	+827,647	+34%	$25.52	Q1 2024
31 Dec 2023	0.35%	-0.56%	$22,213,524	2,454,533	-3,962,465	-62%	$9.05	Q4 2023
30 Sep 2023	0.81%	0%	$40,940,447	6,416,998	0		$6.38	Q3 2023
30 Jun 2023	1.3%	0%	$71,164,508	6,416,998	0		$11.09	Q2 2023
31 Mar 2023	2.2%	+0.33%	$98,500,919	6,416,998	+962,465	+18%	$15.35	Q1 2023
31 Dec 2022	2.5%	+1.5%	$121,036,087	5,454,533	+3,287,142	+152%	$22.19	Q4 2022
30 Sep 2022	0.76%	0%	$35,393,000	2,167,391	0		$16.33	Q3 2022
30 Jun 2022	0.84%	0%	$31,492,000	2,167,391	0		$14.53	Q2 2022
31 Mar 2022	0.87%	+0.7%	$40,032,000	2,167,391	+1,743,775	+412%	$18.47	Q1 2022
31 Dec 2021	0.18%	0%	$10,069,000	423,616	0		$23.77	Q4 2021
30 Sep 2021	0.14%	+0.14%	$10,434,000	423,616	+423,616	NEW	$24.63	Q3 2021

* 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.