# ALTIMMUNE INC COM NEW

ALTIMMUNE INC COM NEW is a security (CUSIP 02155H200) tracked across SEC portfolio filings. 191 institutional managers reported $220.4M on Form 13F as of 2026-06-30; 16 registered fund positions totaling $18.4M via N-PORT as of 2026-05-31.

## Summary

- Issuer: ALTIMMUNE INC
- Class: COM NEW
- CUSIP: 02155H200
- Asset category: EC
- 13F holders: 191
- 13F value: $220.4M
- 13F period: 2026-06-30
- N-PORT fund positions: 16
- N-PORT value: $18.4M
- N-PORT report: 2026-05-31

## Top institutional holders (Form 13F)

_Showing 15 of 191 managers by value._

| Manager | Location | Value | Shares |
| --- | --- | --- | --- |
| BlackRock, Inc. | New York, NY | $39.4M | 12,795,277 |
| [VANGUARD GROUP INC](https://search.stillhousedata.com/firm/105958) | Valley Forge, PA | $34.3M | 9,491,159 |
| STATE STREET CORP | BOSTON, MA | $22.0M | 7,145,550 |
| [MARSHALL WACE, LLP](https://search.stillhousedata.com/firm/160885) | LONDON, X0 | $12.4M | 4,017,901 |
| MILLENNIUM MANAGEMENT LLC | NEW YORK, NY | $10.0M | 3,258,191 |
| [GEODE CAPITAL MANAGEMENT, LLC](https://search.stillhousedata.com/firm/115504) | BOSTON, MA | $9.6M | 3,107,096 |
| [Alyeska Investment Group, L.P.](https://search.stillhousedata.com/firm/155058) | CHICAGO, IL | $8.1M | 2,644,600 |
| [TWO SIGMA INVESTMENTS, LP](https://search.stillhousedata.com/firm/137137) | New York, NY | $7.6M | 2,478,900 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | BALA CYNWYD, PA | $7.5M | 1,325,956 |
| Nuveen, LLC | CHARLOTTE, NC | $7.2M | 2,334,601 |
| GOLDMAN SACHS GROUP INC | NEW YORK, NY | $4.2M | 1,350,649 |
| DIMENSIONAL FUND ADVISORS LP | AUSTIN, TX | $3.2M | 1,045,926 |
| NORTHERN TRUST CORP | CHICAGO, IL | $3.1M | 996,721 |
| [CITADEL ADVISORS LLC](https://search.stillhousedata.com/firm/148826) | MIAMI, FL | $3.0M | 448,873 |
| UBS Group AG | Zurich, V8 | $2.8M | 904,768 |

## Top fund holders (N-PORT)

_Showing 15 of 16 fund positions by value._

| Fund | Registrant | Value | % of fund |
| --- | --- | --- | --- |
| [VANGUARD STRATEGIC EQUITY FUND](https://search.stillhousedata.com/fund/S000002593) | VANGUARD HORIZON FUNDS | $5.7M | 5.59% |
| [VANGUARD EXTENDED MARKET INDEX FUND](https://search.stillhousedata.com/fund/S000002841) | VANGUARD INDEX FUNDS | $4.4M | 0.53% |
| [VANGUARD EXPLORER FUND](https://search.stillhousedata.com/fund/S000002578) | VANGUARD EXPLORER FUND | $3.2M | 1.45% |
| [VANGUARD RUSSELL 2000 INDEX FUND](https://search.stillhousedata.com/fund/S000030003) | VANGUARD SCOTTSDALE FUNDS | $2.0M | 1.17% |
| [VANGUARD MARKET NEUTRAL FUND](https://search.stillhousedata.com/fund/S000019457) | VANGUARD MONTGOMERY FUNDS | $1.1M | 24.53% |
| [Master Small Cap Index Series](https://search.stillhousedata.com/fund/S000002716) | Quantitative Master Series LLC | $653K | 1.35% |
| [U.S. MICRO CAP PORTFOLIO](https://search.stillhousedata.com/fund/S000000948) | DFA INVESTMENT DIMENSIONS GROUP INC | $581K | 0.78% |
| [VANGUARD BALANCED INDEX FUND](https://search.stillhousedata.com/fund/S000002560) | VANGUARD VALLEY FORGE FUNDS | $236K | 0.04% |
| [VANGUARD INSTITUTIONAL TOTAL STOCK MARKET INDEX FUND](https://search.stillhousedata.com/fund/S000002855) | VANGUARD INSTITUTIONAL INDEX FUNDS | $177K | 0.06% |
| [BlackRock Advantage SMID Cap Fund, Inc.](https://search.stillhousedata.com/fund/S000002323) | BlackRock Advantage SMID Cap Fund, Inc. | $167K | 2.21% |
| [GMO U.S. Equity Fund](https://search.stillhousedata.com/fund/S000004081) | GMO TRUST | $109K | 4.94% |
| [DWS Small Cap Index VIP](https://search.stillhousedata.com/fund/S000006223) | DEUTSCHE DWS INVESTMENTS VIT FUNDS | $56K | 1.33% |
| [Invesco NASDAQ Future Gen 200 ETF](https://search.stillhousedata.com/fund/S000077288) | Invesco Exchange-Traded Fund Trust II | $54K | 28.76% |
| Weiss Strategic Interval Fund | Weiss Strategic Interval Fund | $53K | 1.04% |
| [Blackstone Alternative Multi-Strategy Fund](https://search.stillhousedata.com/fund/S000045538) | Blackstone Alternative Investment Funds | $25K | 0.07% |

## More

- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/security/02155H200.md)
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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.