# ACUMEN PHARMACEUTICALS INC COMMON STOCK

ACUMEN PHARMACEUTICALS INC COMMON STOCK is a security (CUSIP 00509G209) tracked across SEC portfolio filings. 93 institutional managers reported $114.7M on Form 13F as of 2026-06-30; 6 registered fund positions totaling $1.2M via N-PORT as of 2026-04-30.

## Summary

- Issuer: ACUMEN PHARMACEUTICALS INC
- Class: COMMON STOCK
- CUSIP: 00509G209
- Asset category: EC
- 13F holders: 93
- 13F value: $114.7M
- 13F period: 2026-06-30
- N-PORT fund positions: 6
- N-PORT value: $1.2M
- N-PORT report: 2026-04-30

## Top institutional holders (Form 13F)

_Showing 15 of 93 managers by value._

| Manager | Location | Value | Shares |
| --- | --- | --- | --- |
| RA CAPITAL MANAGEMENT, L.P. | Boston, MA | $49.5M | 20,992,669 |
| [Sands Capital Ventures, LLC](https://search.stillhousedata.com/firm/155517) | ARLINGTON, VA | $8.8M | 3,720,105 |
| BlackRock, Inc. | New York, NY | $6.6M | 2,490,115 |
| [Alyeska Investment Group, L.P.](https://search.stillhousedata.com/firm/155058) | CHICAGO, IL | $5.8M | 2,454,754 |
| FRANKLIN RESOURCES INC | San Mateo, CA | $5.4M | 2,305,096 |
| [ADAR1 Capital Management, LLC](https://search.stillhousedata.com/firm/299694) | AUSTIN, TX | $5.1M | 2,156,334 |
| Knollwood Investment Advisory, LLC | HUNT VALLEY, MD | $3.8M | 1,628,510 |
| [VANGUARD GROUP INC](https://search.stillhousedata.com/firm/105958) | Valley Forge, PA | $3.5M | 1,653,772 |
| FMR LLC | BOSTON, MA | $2.7M | 1,157,346 |
| [Ikarian Capital, LLC](https://search.stillhousedata.com/firm/1778253) | DALLAS, TX | $2.5M | 1,053,797 |
| Hudson Bay Capital Management LP | Greenwich, CT | $2.3M | 968,940 |
| Pathstone Holdings, LLC | ENGLEWOOD, NJ | $2.0M | 859,110 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | BALA CYNWYD, PA | $1.7M | 601,476 |
| STATE STREET CORP | BOSTON, MA | $1.6M | 600,528 |
| MILLENNIUM MANAGEMENT LLC | NEW YORK, NY | $1.6M | 659,675 |

## Top fund holders (N-PORT)

| Fund | Registrant | Value | % of fund |
| --- | --- | --- | --- |
| [VANGUARD EXTENDED MARKET INDEX FUND](https://search.stillhousedata.com/fund/S000002841) | VANGUARD INDEX FUNDS | $841K | 0.10% |
| [Fidelity Advisor Health Care Fund](https://search.stillhousedata.com/fund/S000005329) | Fidelity Advisor Series VII | $202K | 0.70% |
| [VANGUARD BALANCED INDEX FUND](https://search.stillhousedata.com/fund/S000002560) | VANGUARD VALLEY FORGE FUNDS | $62K | 0.01% |
| [U.S. MICRO CAP PORTFOLIO](https://search.stillhousedata.com/fund/S000000948) | DFA INVESTMENT DIMENSIONS GROUP INC | $26K | 0.03% |
| [Blackstone Alternative Multi-Strategy Fund](https://search.stillhousedata.com/fund/S000045538) | Blackstone Alternative Investment Funds | $13K | 0.04% |
| [VANGUARD INSTITUTIONAL TOTAL STOCK MARKET INDEX FUND](https://search.stillhousedata.com/fund/S000002855) | VANGUARD INSTITUTIONAL INDEX FUNDS | $13K | 0.00% |

## More

- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/security/00509G209.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

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Source: public SEC filing data via Adviser Search (https://search.stillhousedata.com).
Agents: this data is also queryable via MCP tools and read-only SQL — see https://search.stillhousedata.com/llms.txt.