ABOS · Acumen Pharmaceuticals, Inc.

$3.16 -0.03 (-0.94%) At close · Aug 21

Market Cap

$228.52M

72.32M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Quarter:

Holders: 96

Total Value: $127,936,098

Total Shares: 47,916,162

Institutional Ownership Trend

20 quarters

Holder Concentration

Across 96 13F filers · Δ vs Mar 31, 2026

Top Holder

43.8%

−1.7 pts

Top 5

66.7%

−1.8 pts

Top 10

82.6%

+0.4 pts

HHI

2,126

Moderately concentrated−138

Quarterly Activity

vs Mar 31, 2026

New

Increased

Decreased

Sold Out

Unchanged

Holder count: +11

Institutional value: +17.4%

Shares held: +3.8%

Top Buyers

vs Mar 31, 2026

Institution	Added	Now Holds
Mega BlackRock, Inc.	+2,311,789	2,490,115
Mega GEODE CAPITAL MANAGEMENT, LLC	+725,620	1,141,858
Mega STATE STREET CORP	+448,800	600,528
Mega NORTHERN TRUST CORP	+285,532	360,744
Large RENAISSANCE TECHNOLOGIES LLC	+201,079	675,025

Top Sellers

vs Mar 31, 2026

Institution	Sold	Now Holds
Mega FMR LLC	−1,149,816	7,530
Mega MILLENNIUM MANAGEMENT LLC	−599,077	60,598
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP	−527,872	185,504
Large MARSHALL WACE, LLP	−144,775	48,114
Mega Qube Research & Technologies Ltd	−81,774	38,614

Top New Positions

vs Mar 31, 2026

Institution	Acquired	Value (USD)
Mega VANGUARD PORTFOLIO MANAGEMENT LLC	320,795	$856,522
Large NOMURA HOLDINGS INC	189,712	$506,531
Mega Bank of New York Mellon Corp	124,377	$332,085
Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC	115,099	$307,314
Mega Nuveen, LLC	63,355	$169,157

Top Sold-Out Positions

vs Mar 31, 2026

Institution	Previously Held	Last Value (USD)
Mega SG Americas Securities, LLC	719,257	$1,697,446
Mid Laurion Capital Management LP	525,444	$1,240,047
Mega JANE STREET GROUP, LLC	132,261	$312,135
Large Point72 Asset Management, L.P.	67,375	$159,005
Mid Catalyst Funds Management Pty Ltd	45,600	$107,616

Filter: New 29 Increased 22 Reduced 15 Sold out 18 Unchanged 30

Showing 97 of 97

All Common Calls Puts

Compact Export CSV

Holder

Value (USD)

% of 13F

RA CAPITAL MANAGEMENT, L.P.

$56,050,426

43.81%

20,992,669

Sands Capital Alternatives, LLC

$9,932,680

7.76%

3,720,105

BlackRock, Inc.

$6,648,605

5.20%

2,490,115

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BLACKROCK FINANCIAL MANAGEMENT INC/DE	6,392	$17,066	0.3%	Sole
BlackRock Investment Management, LLC	138,942	$370,975	5.6%	Sole
BLACKROCK ADVISORS LLC	94,716	$252,891	3.8%	Sole
BlackRock Fund Advisors	1,631,478	$4,356,046	65.5%	Sole
BlackRock Institutional Trust Company, N.A.	618,587	$1,651,627	24.8%	Sole

Alyeska Investment Group, L.P.

$6,554,193

5.12%

2,454,754

FRANKLIN RESOURCES INC

$6,154,606

4.81%

2,305,096

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
FRANKLIN ADVISERS INC	2,305,096	$6,154,606	100.0%	Defined

ADAR1 Capital Management, LLC

$5,637,261

4.41%

2,111,334

VANGUARD CAPITAL MANAGEMENT LLC

$4,464,432

3.49%

1,672,072

Knollwood Investment Advisory, LLC

$4,348,121

3.40%

1,628,510

GEODE CAPITAL MANAGEMENT, LLC

$3,048,760

2.38%

1,141,858

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GEODE CAPITAL MANAGEMENT TRUST COMPANY, LLC	154,941	$413,692	13.6%	Defined
Held directly	986,917	$2,635,068	86.4%	Defined

Ikarian Capital, LLC

$2,813,637

2.20%

1,053,797

Hudson Bay Capital Management LP

$2,549,850

1.99%

955,000

Pathstone Holdings, LLC

$2,293,823

1.79%

859,110

RENAISSANCE TECHNOLOGIES LLC

$1,802,316

1.41%

675,025

TWO SIGMA INVESTMENTS, LP

$1,663,094

1.30%

622,882

STATE STREET CORP

$1,603,409

1.25%

600,528

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SSGA FUNDS MANAGEMENT, INC. joint	600,528	$1,603,409	100.0%	Defined

NORTHERN TRUST CORP

$963,185

0.75%

360,744

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
NORTHERN TRUST CO joint	353,373	$943,505	98.0%	Defined
DWS INVESTMENT MANAGEMENT AMERICAS, INC joint	7,371	$19,680	2.0%	Other

VANGUARD PORTFOLIO MANAGEMENT LLC

$856,522

0.67%

320,795

DIMENSIONAL FUND ADVISORS LP

$778,461

0.61%

291,559

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Dimensional Fund Advisors Ltd.	5,063	$13,518	1.7%	Defined
DFA Australia Ltd.	18,419	$49,178	6.3%	Defined
Dimensional Ireland Ltd	39,299	$104,928	13.5%	Defined
Held directly	228,778	$610,837	78.5%	Sole

VANGUARD FIDUCIARY TRUST CO

$777,610

0.61%

291,240

BANK OF AMERICA CORP /DE/

$733,664

0.57%

274,781

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BANK OF AMERICA NA	81,365	$217,244	29.6%	Defined
MERRILL LYNCH, PIERCE, FENNER & SMITH INC.	165,090	$440,790	60.1%	Defined
BOFA SECURITIES, INC.	28,326	$75,630	10.3%	Defined

BOOTHBAY FUND MANAGEMENT, LLC

$728,942

0.57%

273,012

ACADIAN ASSET MANAGEMENT LLC

$721,802

0.56%

270,338

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Acadian Inc	270,338	$721,802	100.0%	Defined

NOMURA HOLDINGS INC

$506,531

0.40%

189,712

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
NOMURA SECURITIES INTERNATIONAL INC	189,712	$506,531	100.0%	Defined

GOLDMAN SACHS GROUP INC

$491,084

0.38%

183,927

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GOLDMAN SACHS & CO. LLC	75,808	$202,407	41.2%	Defined
GOLDMAN SACHS ASSET MANAGEMENT, L.P.	108,119	$288,677	58.8%	Defined

BRIDGEWAY CAPITAL MANAGEMENT, LLC

$470,376

0.37%

176,171

MORGAN STANLEY

$365,156

0.29%

136,763

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
MORGAN STANLEY & CO INTERNATIONAL PLC	51	$136	0.0%	Defined
MORGAN STANLEY & CO. LLC	28,878	$77,104	21.1%	Defined
MORGAN STANLEY CAPITAL SERVICES, LLC	17,642	$47,104	12.9%	Defined
MORGAN STANLEY SMITH BARNEY LLC	89,521	$239,021	65.5%	Defined
PARAMETRIC PORTFOLIO ASSOCIATES LLC	671	$1,791	0.5%	Defined

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$336,697

0.26%

126,104

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	126,104	$336,697	100.0%	Other

Bank of New York Mellon Corp

$332,085

0.26%

124,377

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Mellon Investments Corporation	48,619	$129,812	39.1%	Defined
The Bank of New York Mellon	75,756	$202,268	60.9%	Defined
Held directly	2	$5	0.0%	Defined

CHARLES SCHWAB INVESTMENT MANAGEMENT INC

$307,314

0.24%

115,099

PFG Investments, LLC

$251,647

0.20%

94,250

CATALYST FINANCIAL PARTNERS LLC

$239,496

0.19%

89,699

Nuveen, LLC

$169,157

0.13%

63,355

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
TEACHERS ADVISORS, LLC joint	63,355	$169,157	100.0%	Defined

MILLENNIUM MANAGEMENT LLC

$161,796

0.13%

60,598

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$158,598

0.12%

59,400

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	59,400	$158,598	100.0%	Other

Squarepoint Ops LLC

$139,777

0.11%

52,351

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Squarepoint Capital LLP	52,351	$139,777	100.0%	Defined

CITADEL ADVISORS LLC

$136,300

0.11%

51,049

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	51,049	$136,300	100.0%	Defined

Prospera Financial Services Inc

$133,500

0.10%

50,000

WELLS FARGO & COMPANY/MN

$132,661

0.10%

49,686

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
WELLS FARGO BANK N A	39,578	$105,673	79.7%	Defined
WELLS FARGO ADVISORS FINANCIAL NETWORK, LLC	3,100	$8,277	6.2%	Defined
WELLS FARGO CLEARING SERVICES, LLC	7,008	$18,711	14.1%	Defined

MARSHALL WACE, LLP

$128,464

0.10%

48,114

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Marshall Wace North America L.P. joint	48,114	$128,464	100.0%	Other

DEUTSCHE BANK AG\

$123,172

0.10%

46,132

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
DWS Investments UK Ltd	46,132	$123,172	100.0%	Defined

Verdad Advisers, LP

$118,756

0.09%

44,478

BARCLAYS PLC

$105,878

0.08%

39,655

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BARCLAYS BANK PLC	37,221	$99,380	93.9%	Defined
BARCLAYS CAPITAL INC.	2,434	$6,498	6.1%	Defined

PRICE T ROWE ASSOCIATES INC /MD/

$105,003

0.08%

39,327

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
T. Rowe Price International Ltd	39,327	$105,003	100.0%	Defined

Qube Research & Technologies Ltd

$103,099

0.08%

38,614

NEW YORK STATE COMMON RETIREMENT FUND

$96,654

0.08%

36,200

RHUMBLINE ADVISERS

$93,540

0.07%

35,034

Rangeley Capital, LLC

$93,450

0.07%

35,000

XTX Topco Ltd

$85,797

0.07%

32,134

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
XTX EXECUTION SERVICES LLC joint	32,134	$85,797	100.0%	Defined

Intrepid Financial Planning Group LLC

$80,500

0.06%

30,150

Y-Intercept (Hong Kong) Ltd

$78,871

0.06%

29,540

Quantinno Capital Management LP

$71,473

0.06%

26,769

UBS Group AG

$68,791

0.05%

25,765

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
UBS Financial Services Inc	6	$16	0.0%	Defined
UBS AG	8,884	$23,720	34.5%	Defined
UBS Europe SE	16,874	$45,053	65.5%	Defined
UBS Securities LLC	1	$2	0.0%	Defined

Invesco Ltd.

$65,649

0.05%

24,588

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Invesco Advisers, Inc. joint	5,742	$15,331	23.4%	Defined
Invesco Trust Co joint	18,846	$50,318	76.6%	Defined

AXQ CAPITAL, LP

$65,217

0.05%

24,426

AMERICAN CENTURY COMPANIES INC

$64,443

0.05%

24,136

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
AMERICAN CENTURY INVESTMENT MANAGEMENT INC	24,136	$64,443	100.0%	Defined

CITIGROUP INC

$58,443

0.05%

21,889

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citigroup Financial Products Inc. joint	21,889	$58,443	100.0%	Defined

MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.

$58,101

0.05%

21,761

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Global X Management CO LLC joint	21,761	$58,101	100.0%	Defined

JPMORGAN CHASE & CO

$53,828

0.04%

20,161

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
JPMorgan Chase Bank, N.A.	20,012	$53,431	99.3%	Defined
J.P. Morgan Securities plc	149	$397	0.7%	Defined

Police & Firemen's Retirement System of New Jersey

$51,779

0.04%

19,393

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Mellon Capital	19,393	$51,779	100.0%	Defined

Independent Advisor Alliance

$50,730

0.04%

19,000

Pinnacle Wealth Management Advisory Group, LLC

$48,113

0.04%

18,020

PINNACLE ASSOCIATES LTD

$48,113

0.04%

18,020

Factor Wealth Management LTD

$44,055

0.03%

16,500

Spark Investment Management LLC

$39,249

0.03%

14,700

STIFEL FINANCIAL CORP

$34,443

0.03%

12,900

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
STIFEL NICOLAUS & CO INC \MO\	12,400	$33,108	96.1%	Defined
Held directly	500	$1,335	3.9%	Defined

Virtu Financial LLC

$31,879

0.02%

11,940

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Virtu Americas LLC	11,940	$31,879	100.0%	Defined

TWO SIGMA SECURITIES, LLC

$31,751

0.02%

11,892

Balyasny Asset Management L.P.

$31,698

0.02%

11,872

SEI INVESTMENTS CO

$30,875

0.02%

11,564

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SEI TRUST CO	11,564	$30,875	100.0%	Sole

BNP PARIBAS ARBITRAGE, SA

$30,248

0.02%

11,329

Mesirow Financial Investment Management, Inc.

$30,184

0.02%

11,305

Bronte Capital Management Pty Ltd.

$28,611

0.02%

10,716

INTECH INVESTMENT MANAGEMENT LLC

$27,890

0.02%

10,446

Integrated Wealth Concepts LLC

$27,177

0.02%

10,179

Steward Partners Investment Advisory, LLC

$26,700

0.02%

10,000

FMR LLC

$20,104

0.02%

7,530

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Fidelity Management & Research Co LLC	7,474	$19,955	99.3%	Defined
STRATEGIC ADVISERS LLC	56	$149	0.7%	Defined

OSAIC HOLDINGS, INC.

$19,624

0.02%

7,350

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
OSAIC WEALTH, INC.	7,350	$19,624	100.0%	Defined

Vanguard Global Advisers, LLC

$17,846

0.01%

6,684

Legal & General Group Plc

$12,308

0.01%

4,610

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Legal & General Investment Management America Inc	4,610	$12,308	100.0%	Defined

Ameritas Investment Partners, Inc.

$11,451

0.01%

4,289

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
EATON VANCE MANAGEMENT	4,289	$11,451	100.0%	Other

Russell Investments Group, Ltd.

$10,089

0.01%

3,779

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Russell Investment Management, LLC	3,779	$10,089	100.0%	Defined

PNC FINANCIAL SERVICES GROUP, INC.

$8,223

0.01%

3,080

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
PNC Bank, National Association	3,080	$8,223	100.0%	Defined

Rockefeller Capital Management L.P.

$8,010

0.01%

3,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
ROCKEFELLER FINANCIAL LLC	3,000	$8,010	100.0%	Defined

Tower Research Capital LLC (TRC)

$7,740

0.01%

2,899

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Latour Trading LLC (Latour)	2,899	$7,740	100.0%	Defined

TFC Financial Management, Inc.

$6,675

0.01%

2,500

JONES FINANCIAL COMPANIES LLLP

$5,340

0.00%

2,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Edward D. Jones & Co., L.P.	2,000	$5,340	100.0%	Sole

ROYAL BANK OF CANADA

$4,167

0.00%

1,561

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
RBC CMA LTD.	1,561	$4,167	100.0%	Defined

NISA INVESTMENT ADVISORS, LLC

$3,281

0.00%

1,229

US BANCORP \DE\

$2,670

0.00%

1,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
US BANK NATIONAL ASSOCIATION	1,000	$2,670	100.0%	Defined

Sterling Capital Management LLC

$2,541

0.00%

952

GROUP ONE TRADING LLC

$1,927

0.00%

722

Avion Wealth

$1,335

0.00%

500

EverSource Wealth Advisors, LLC

$1,086

0.00%

407

SBI Securities Co., Ltd.

$776

0.00%

291

Farther Finance Advisors, LLC

$534

0.00%

200

Caitong International Asset Management Co., Ltd

$104

0.00%

Arax Advisory Partners

$69

0.00%

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Jane Street Capital, LLC	63,043	$148,781	70.3%	Defined
Jane Street Global Trading, LLC	26,618	$62,818	29.7%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Jane Street Capital, LLC	23,700	$55,932	100.0%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Jane Street Capital, LLC	18,900	$44,604	100.0%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Brevan Howard US Investment Management, LP	15,385	$36,308	100.0%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Fidelity Institutional Asset Management Trust Co	111	$261	10.0%	Sole
Held directly	1,000	$2,360	90.0%	Sole

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
NBT Capital Management, Inc	200	$472	100.0%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Optiver VOF	5	$11	100.0%	Defined

Key facts CIK 1576885 CUSIP 00509G209 13F (30d) 91 filings 91 filers Visit website Investor relations