# ATRIUM THERAPEUTICS INC COM

ATRIUM THERAPEUTICS INC COM is a security (CUSIP 04965N104) tracked across SEC portfolio filings. 167 institutional managers reported $180.4M on Form 13F as of 2026-06-30; 22 registered fund positions totaling $22.2M via N-PORT as of 2026-05-31.

## Summary

- Issuer: ATRIUM THERAPEUTICS INC
- Class: COM
- CUSIP: 04965N104
- Asset category: EC
- 13F holders: 167
- 13F value: $180.4M
- 13F period: 2026-06-30
- N-PORT fund positions: 22
- N-PORT value: $22.2M
- N-PORT report: 2026-05-31

## Top institutional holders (Form 13F)

_Showing 15 of 167 managers by value._

| Manager | Location | Value | Shares |
| --- | --- | --- | --- |
| BlackRock, Inc. | New York, NY | $16.1M | 1,205,291 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | BALA CYNWYD, PA | $13.8M | 11,343 |
| RA CAPITAL MANAGEMENT, L.P. | Boston, MA | $11.6M | 864,102 |
| [TIG Advisors, LLC](https://search.stillhousedata.com/firm/138306) | New York, NY | $8.1M | 607,552 |
| Pentwater Capital Management LP | Naples, FL | $8.1M | 602,649 |
| O'Connor Alternative Investments LLC | NEW YORK, NY | $7.7M | 578,011 |
| [Sessa Capital IM, L.P.](https://search.stillhousedata.com/firm/166403) | NEW YORK, NY | $7.4M | 551,391 |
| GOLDMAN SACHS GROUP INC | NEW YORK, NY | $4.7M | 349,950 |
| [FARALLON CAPITAL MANAGEMENT LLC](https://search.stillhousedata.com/firm/107322) | SAN FRANCISCO, CA | $4.7M | 349,360 |
| [GEODE CAPITAL MANAGEMENT, LLC](https://search.stillhousedata.com/firm/115504) | BOSTON, MA | $4.3M | 319,831 |
| [683 Capital Management, LLC](https://search.stillhousedata.com/firm/156181) | NEW YORK, NY | $4.0M | 300,000 |
| Bellevue Group AG | Kuesnacht, V8 | $3.5M | 263,096 |
| STATE STREET CORP | BOSTON, MA | $3.4M | 257,086 |
| Weiss Asset Management LP | BOSTON, MA | $3.2M | 240,701 |
| CANTOR FITZGERALD, L. P. | NEW YORK, NY | $3.2M | 235,637 |

## Top fund holders (N-PORT)

_Showing 15 of 22 fund positions by value._

| Fund | Registrant | Value | % of fund |
| --- | --- | --- | --- |
| [T. Rowe Price Health Sciences Fund, Inc.](https://search.stillhousedata.com/fund/S000002088) | T. ROWE PRICE HEALTH SCIENCES FUND, INC. | $8.9M | 8.18% |
| [T. Rowe Price New Horizons Fund, Inc.](https://search.stillhousedata.com/fund/S000002106) | T. ROWE PRICE NEW HORIZONS FUND, INC. | $5.9M | 4.64% |
| [BlackRock Event Driven Equity Fund](https://search.stillhousedata.com/fund/S000018499) | BlackRock Large Cap Series Funds, Inc. | $2.3M | 4.77% |
| [VANGUARD EXTENDED MARKET INDEX FUND](https://search.stillhousedata.com/fund/S000002841) | VANGUARD INDEX FUNDS | $2.1M | 0.26% |
| [VANGUARD RUSSELL 2000 INDEX FUND](https://search.stillhousedata.com/fund/S000030003) | VANGUARD SCOTTSDALE FUNDS | $818K | 0.47% |
| [The Merger Fund](https://search.stillhousedata.com/fund/S000005158) | Merger Fund | $623K | 2.52% |
| [T. Rowe Price Health Sciences Portfolio](https://search.stillhousedata.com/fund/S000002083) | T. ROWE PRICE EQUITY SERIES, INC. | $558K | 8.41% |
| [Master Small Cap Index Series](https://search.stillhousedata.com/fund/S000002716) | Quantitative Master Series LLC | $257K | 0.53% |
| [Fidelity SAI Merger Arbitrage Fund](https://search.stillhousedata.com/fund/S000091043) | Fidelity Greenwood Street Trust | $192K | 3.35% |
| [The Gabelli ABC Fund](https://search.stillhousedata.com/fund/S000001070) | Gabelli Investor Funds Inc | $134K | 3.21% |
| [VANGUARD BALANCED INDEX FUND](https://search.stillhousedata.com/fund/S000002560) | VANGUARD VALLEY FORGE FUNDS | $107K | 0.02% |
| [VANGUARD INSTITUTIONAL TOTAL STOCK MARKET INDEX FUND](https://search.stillhousedata.com/fund/S000002855) | VANGUARD INSTITUTIONAL INDEX FUNDS | $92K | 0.03% |
| GDL Fund | GDL Fund | $67K | 5.81% |
| [Virtus Westchester Event-Driven Fund](https://search.stillhousedata.com/fund/S000040968) | Virtus Event Opportunities Trust | $36K | 2.75% |
| [Enterprise Mergers and Acquisitions Fund](https://search.stillhousedata.com/fund/S000017793) | Gabelli 787 Fund, Inc. | $27K | 4.69% |

## More

- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/security/04965N104.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.