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Acumen Pharmaceuticals, Inc.
$2.74 +0.15 (+5.79%) At close · Jul 2
Market Cap
$197.90M
Shares
72,227,580

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.

Holders: 85
Total Value: $108,955,506
Total Shares: 46,167,605

Institutional Ownership Trend

19 quarters

Holder Concentration

Across 85 13F filers · Δ vs Dec 31, 2025
Top Holder
45.5%
Jun 2023 → Mar 2026 · range 11.8% – 45.5%
+3.6 pts
Top 5
68.5%
Jun 2023 → Mar 2026 · range 48.0% – 75.1%
+0.3 pts
Top 10
82.2%
Jun 2023 → Mar 2026 · range 73.0% – 90.6%
−0.5 pts
HHI
2,264
Jun 2023 → Mar 2026 · range 642 – 2,264
Moderately concentrated+263

Quarterly Activity

vs Dec 31, 2025
New
21
Increased
31
Decreased
13
Sold Out
7
Unchanged
20
Holder count: +14
Institutional value: +44.7%
Shares held: +29.4%

Top Buyers

vs Dec 31, 2025
Institution Added Now Holds Open
Mid RA CAPITAL MANAGEMENT, L.P. +6,060,606 20,992,669
Large Alyeska Investment Group, L.P. +1,515,151 2,454,754
Mid ADAR1 Capital Management, LLC +1,265,151 2,156,334
Mid Ikarian Capital, LLC +799,485 1,053,797
Mega TWO SIGMA INVESTMENTS, LP +387,591 530,812

Top Sellers

vs Dec 31, 2025
Institution Sold Now Holds Open
Mega FMR LLC −870,151 1,157,346
Mega CITADEL ADVISORS LLC −360,083 12,000
Mid Laurion Capital Management LP −341,602 525,444
Mega MORGAN STANLEY −22,321 144,584
Mega JANE STREET GROUP, LLC −9,862 132,261

Top New Positions

vs Dec 31, 2025
Institution Acquired Value (USD) Open
Mega VANGUARD CAPITAL MANAGEMENT LLC 1,506,277 $3,554,813
Mega VANGUARD FIDUCIARY TRUST CO 199,226 $470,173
Micro Verdad Advisers, LP 37,278 $87,976
Small Rangeley Capital, LLC 35,000 $82,600
Small AXQ CAPITAL, LP 28,487 $67,229

Top Sold-Out Positions

vs Dec 31, 2025
Institution Previously Held Last Value (USD) Open
Mega VANGUARD GROUP INC 1,653,772 $3,489,457
Large TWO SIGMA ADVISERS, LP 421,800 $889,998
Mid XTX Topco Ltd 49,563 $104,577
Mid Quadrature Capital Ltd 49,046 $103,487
Mid Virtu Financial LLC 10,922 $23,045
Filter: New 21 Increased 31 Reduced 13 Sold out 7 Unchanged 20
Showing 89 of 89
All Common Calls Puts
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Holder Value (USD) % of 13F Shares Open
Mid RA CAPITAL MANAGEMENT, L.P. $49,542,698 45.47% 20,992,669
Small Sands Capital Alternatives, LLC $8,779,447 8.06% 3,720,105
Large Alyeska Investment Group, L.P. $5,793,219 5.32% 2,454,754
Mega FRANKLIN RESOURCES INC $5,440,026 4.99% 2,305,096
Mid ADAR1 Capital Management, LLC $5,088,948 4.67% 2,156,334
Small Knollwood Investment Advisory, LLC $3,843,283 3.53% 1,628,510
Mega VANGUARD CAPITAL MANAGEMENT LLC $3,554,813 3.26% 1,506,277
Mega FMR LLC $2,731,336 2.51% 1,157,346
Mid Ikarian Capital, LLC $2,486,960 2.28% 1,053,797
Large Hudson Bay Capital Management LP $2,286,698 2.10% 968,940
Large Pathstone Holdings, LLC $2,027,499 1.86% 859,110
Large SG Americas Securities, LLC Broker-Dealer $1,697,446 1.56% 719,257
Mega MILLENNIUM MANAGEMENT LLC $1,556,833 1.43% 659,675
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $1,419,483 1.30% 601,476
Mega TWO SIGMA INVESTMENTS, LP $1,252,716 1.15% 530,812
Mid Laurion Capital Management LP $1,240,047 1.14% 525,444
Large RENAISSANCE TECHNOLOGIES LLC $1,118,512 1.03% 473,946
Mega GEODE CAPITAL MANAGEMENT, LLC $982,320 0.90% 416,238
Mega BANK OF AMERICA CORP /DE/ Bank $755,709 0.69% 320,216
Mid BOOTHBAY FUND MANAGEMENT, LLC $644,308 0.59% 273,012
Mega GOLDMAN SACHS GROUP INC $487,771 0.45% 206,683
Mega VANGUARD FIDUCIARY TRUST CO Bank $470,173 0.43% 199,226
Large MARSHALL WACE, LLP $455,217 0.42% 192,889
Large ACADIAN ASSET MANAGEMENT LLC $438,606 0.40% 185,850
Mega BlackRock, Inc. $420,848 0.39% 178,326
Mid BRIDGEWAY CAPITAL MANAGEMENT, LLC $415,763 0.38% 176,171
Mega STATE STREET CORP $358,078 0.33% 151,728
Mega MORGAN STANLEY $341,216 0.31% 144,584
Large Qube Research & Technologies Ltd $284,115 0.26% 120,388
Mega DIMENSIONAL FUND ADVISORS LP $282,622 0.26% 119,756
Small CATALYST FINANCIAL PARTNERS LLC $211,689 0.19% 89,699
Mega JANE STREET GROUP, LLC $211,599 0.19% 89,661
Mid PFG Investments, LLC $190,806 0.18% 80,850
Mega NORTHERN TRUST CORP Bank $177,500 0.16% 75,212
Large Point72 Asset Management, L.P. $159,005 0.15% 67,375
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $132,160 0.12% 56,000
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $131,924 0.12% 55,900
Mid Prospera Financial Services Inc $118,000 0.11% 50,000
Small Catalyst Funds Management Pty Ltd $107,616 0.10% 45,600
Micro Verdad Advisers, LP $87,976 0.08% 37,278
Mega UBS Group AG $87,663 0.08% 37,146
Small Rangeley Capital, LLC $82,600 0.08% 35,000
Mega BARCLAYS PLC $72,402 0.07% 30,679
Micro Intrepid Financial Planning Group LLC $71,154 0.07% 30,150
Large OMERS ADMINISTRATION Corp $67,496 0.06% 28,600
Small AXQ CAPITAL, LP $67,229 0.06% 28,487
Mega JANE STREET GROUP, LLC $55,932 0.05% 23,700
Mid Independent Advisor Alliance $44,840 0.04% 19,000
Mega JANE STREET GROUP, LLC $44,604 0.04% 18,900
Mid PINNACLE ASSOCIATES LTD $42,527 0.04% 18,020
Small Pinnacle Wealth Management Advisory Group, LLC $42,527 0.04% 18,020
Mega AMERICAN CENTURY COMPANIES INC $42,312 0.04% 17,929
Mid SIMPLEX TRADING, LLC $41,097 0.04% 17,414
Micro Factor Wealth Management LTD $38,940 0.04% 16,500
Large CAPTRUST FINANCIAL ADVISORS $37,186 0.03% 15,757
Mid Brevan Howard Capital Management LP $36,308 0.03% 15,385
Large Squarepoint Ops LLC $35,435 0.03% 15,015
Large HRT FINANCIAL LP $31,062 0.03% 13,162
Large JACOBS LEVY EQUITY MANAGEMENT, INC $30,705 0.03% 13,011
Mega CITADEL ADVISORS LLC $28,320 0.03% 12,000
Large SEI INVESTMENTS CO $27,291 0.03% 11,564
Mid Mesirow Financial Investment Management, Inc. $26,679 0.02% 11,305
Large Schonfeld Strategic Advisors LLC $26,668 0.02% 11,300
Mid Integrated Wealth Concepts LLC $24,022 0.02% 10,179
Mega WELLS FARGO & COMPANY/MN $23,854 0.02% 10,108
Mega ROYAL BANK OF CANADA Bank $16,731 0.02% 7,090
Mega Vanguard Global Advisers, LLC $15,774 0.01% 6,684
Large OSAIC HOLDINGS, INC. $12,628 0.01% 5,351
Mega CITIGROUP INC $10,586 0.01% 4,486
Mega PNC FINANCIAL SERVICES GROUP, INC. $7,268 0.01% 3,080
Large Rockefeller Capital Management L.P. $7,080 0.01% 3,000
Small TFC Financial Management, Inc. $5,900 0.01% 2,500
Large JONES FINANCIAL COMPANIES LLLP $4,720 0.00% 2,000
Mid GROUP ONE TRADING LLC $3,481 0.00% 1,475
Mega JPMORGAN CHASE & CO $3,407 0.00% 1,444
Large NISA INVESTMENT ADVISORS, LLC $2,900 0.00% 1,229
Mega BNP PARIBAS ARBITRAGE, SA $2,850 0.00% 1,208
Mid Advisory Services Network, LLC $2,621 0.00% 1,111
Large US BANCORP \DE\ Bank $2,360 0.00% 1,000
Mid EverSource Wealth Advisors, LLC $960 0.00% 407
Mid SBI Securities Co., Ltd. Broker-Dealer $715 0.00% 303
Mid Farther Finance Advisors, LLC $472 0.00% 200
Mid NBT BANK N A /NY Bank $472 0.00% 200
Mid Tower Research Capital LLC (TRC) $278 0.00% 118
Large CWM, LLC $205 0.00% 87
Mid Clearstead Advisors, LLC $141 0.00% 60
Mid Arax Advisory Partners $61 0.00% 26
Mid Larson Financial Group LLC $47 0.00% 20
Mid Optiver Holding B.V. $11 0.00% 5
Key facts CIK 1576885 CUSIP 00509G209 Visit website Investor relations

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