RA CAPITAL MANAGEMENT, L.P.

Holdings History for Acumen Pharmaceuticals, Inc. - Common Stock, $0.0001 par value per share (ABOS)

Symbol: ABOS on Nasdaq
Investment type: Equity / Common Stock, $0.0001 par value per share
Latest Disclosed Shares Owned: 21,101,669 shares
Security Ownership %: 30%

Shares, Excluding Options vs Price

Value, Excluding Options

RA Capital Management, L.P. ownership in Acumen Pharmaceuticals, Inc. Common Stock, $0.0001 par value per share (ABOS)

17 Mar 2026 - RA Capital Management, L.P. has filed an SCHEDULE 13D/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 21,101,669 shares of Acumen Pharmaceuticals, Inc. Common Stock, $0.0001 par value per share (ABOS). This represents 30% ownership of the company. In their previous filing dated 31 Mar 2025, RA CAPITAL MANAGEMENT, L.P. had reported owning 15,016,063 shares, indicating an increase of +41%. .

Reporting Name	Ownership %	Change	Value $	Shares owned	Change	Activity %	Price	Form	Report date	Filing time
RA Capital Management, L.P.	30%	+19%	$55,075,356	21,101,669	+6,085,606	+41%	$2.61	13D/A	13 Mar 2026	17 Mar 2026, 16:33
RA Capital Management, L.P.	25%		$16,517,669	15,016,063			$1.10	13D/A	27 Mar 2025	31 Mar 2025, 16:57

Holdings date	Weight	Change	Value $	Shares	Change	Activity %	Price	All Holders
31 Dec 2025	0.32%	0%	$31,506,653	14,932,063	0		$2.11	Q4 2025
30 Sep 2025	0.31%	0%	$25,533,828	14,932,063	0		$1.71	Q3 2025
30 Jun 2025	0.29%	0%	$17,321,193	14,932,063	0		$1.16	Q2 2025
31 Mar 2025	0.27%	0%	$16,425,269	14,932,063	0		$1.10	Q1 2025
31 Dec 2024	0.34%	0%	$25,683,148	14,932,063	0		$1.72	Q4 2024
30 Sep 2024	0.43%	0%	$37,031,516	14,932,063	0		$2.48	Q3 2024
30 Jun 2024	0.48%	0%	$36,135,592	14,932,063	0		$2.42	Q2 2024
31 Mar 2024	0.77%	0%	$60,474,855	14,932,063	0		$4.05	Q1 2024
31 Dec 2023	0.9%	0%	$57,339,122	14,932,063	0		$3.84	Q4 2023
30 Sep 2023	1.2%	+0.42%	$61,968,061	14,932,063	+5,161,290	+53%	$4.15	Q3 2023
30 Jun 2023	0.89%	0%	$46,997,418	9,770,773	0		$4.81	Q2 2023
31 Mar 2023	0.9%	0%	$39,669,338	9,770,773	0		$4.06	Q1 2023
31 Dec 2022	1.1%	0%	$52,762,174	9,770,773	0		$5.40	Q4 2022
30 Sep 2022	2.1%	0%	$98,001,000	9,770,773	0		$10.03	Q3 2022
30 Jun 2022	1.2%	0%	$45,923,000	9,770,773	0		$4.70	Q2 2022
31 Mar 2022	0.83%	0%	$38,204,000	9,770,773	0		$3.91	Q1 2022
31 Dec 2021	1.2%	0%	$66,050,000	9,770,773	0		$6.76	Q4 2021
30 Sep 2021	2%	+2%	$145,194,000	9,770,773	+9,770,773	NEW	$14.86	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.