# ANNEXON INC COM

ANNEXON INC COM is a security (CUSIP 03589W102) tracked across SEC portfolio filings. 215 institutional managers reported $838.9M on Form 13F as of 2026-06-30; 19 registered fund positions totaling $28.9M via N-PORT as of 2026-05-31.

## Summary

- Issuer: ANNEXON INC
- Class: COM
- CUSIP: 03589W102
- Asset category: EC
- 13F holders: 215
- 13F value: $838.9M
- 13F period: 2026-06-30
- N-PORT fund positions: 19
- N-PORT value: $28.9M
- N-PORT report: 2026-05-31

## Top institutional holders (Form 13F)

_Showing 15 of 215 managers by value._

| Manager | Location | Value | Shares |
| --- | --- | --- | --- |
| [Redmile Group, LLC](https://search.stillhousedata.com/firm/143606) | San Francisco, CA | $80.6M | 14,549,768 |
| BlackRock, Inc. | New York, NY | $60.6M | 10,938,509 |
| FMR LLC | BOSTON, MA | $58.9M | 10,635,648 |
| BVF INC/IL | San Francisco, CA | $48.2M | 8,698,173 |
| [VANGUARD GROUP INC](https://search.stillhousedata.com/firm/105958) | Valley Forge, PA | $38.9M | 7,753,387 |
| STATE STREET CORP | BOSTON, MA | $38.3M | 6,919,255 |
| Bain Capital Life Sciences Investors, LLC | Boston, MA | $28.9M | 5,212,674 |
| Bellevue Group AG | Kuesnacht, V8 | $28.6M | 5,157,290 |
| [MAK CAPITAL ONE LLC](https://search.stillhousedata.com/firm/158132) | NEW YORK, NY | $26.2M | 4,724,043 |
| [ADAGE CAPITAL PARTNERS GP, L.L.C.](https://search.stillhousedata.com/firm/160679) | Boston, MA | $23.8M | 4,300,000 |
| BANK OF AMERICA CORP /DE/ | CHARLOTTE, NC | $23.6M | 4,259,995 |
| Nuveen, LLC | CHARLOTTE, NC | $23.5M | 4,246,330 |
| Siren, L.L.C. | New York, NY | $21.9M | 3,958,646 |
| [Balyasny Asset Management L.P.](https://search.stillhousedata.com/firm/138111) | Chicago, IL | $21.5M | 3,886,909 |
| [GEODE CAPITAL MANAGEMENT, LLC](https://search.stillhousedata.com/firm/115504) | BOSTON, MA | $18.7M | 3,377,823 |

## Top fund holders (N-PORT)

_Showing 15 of 19 fund positions by value._

| Fund | Registrant | Value | % of fund |
| --- | --- | --- | --- |
| [VANGUARD EXTENDED MARKET INDEX FUND](https://search.stillhousedata.com/fund/S000002841) | VANGUARD INDEX FUNDS | $8.4M | 1.03% |
| [Columbia Acorn Fund](https://search.stillhousedata.com/fund/S000009184) | COLUMBIA ACORN TRUST | $5.4M | 24.07% |
| [Fidelity Advisor Health Care Fund](https://search.stillhousedata.com/fund/S000005329) | Fidelity Advisor Series VII | $4.4M | 15.25% |
| [VANGUARD RUSSELL 2000 INDEX FUND](https://search.stillhousedata.com/fund/S000030003) | VANGUARD SCOTTSDALE FUNDS | $3.7M | 2.09% |
| [VANGUARD U.S. MOMENTUM FACTOR ETF](https://search.stillhousedata.com/fund/S000061302) | VANGUARD WELLINGTON FUND | $2.4M | 13.33% |
| [Master Small Cap Index Series](https://search.stillhousedata.com/fund/S000002716) | Quantitative Master Series LLC | $1.2M | 2.46% |
| [T. Rowe Price Health Sciences Fund, Inc.](https://search.stillhousedata.com/fund/S000002088) | T. ROWE PRICE HEALTH SCIENCES FUND, INC. | $978K | 0.90% |
| [U.S. MICRO CAP PORTFOLIO](https://search.stillhousedata.com/fund/S000000948) | DFA INVESTMENT DIMENSIONS GROUP INC | $535K | 0.72% |
| [Russell Investments U.S. Small Cap Equity ETF](https://search.stillhousedata.com/fund/S000089990) | Russell Investments Exchange Traded Funds | $401K | 81.15% |
| [VANGUARD BALANCED INDEX FUND](https://search.stillhousedata.com/fund/S000002560) | VANGUARD VALLEY FORGE FUNDS | $384K | 0.07% |
| [Fidelity Nasdaq Composite Index ETF](https://search.stillhousedata.com/fund/S000006011) | Fidelity Commonwealth Trust | $379K | 0.35% |
| [VANGUARD INSTITUTIONAL TOTAL STOCK MARKET INDEX FUND](https://search.stillhousedata.com/fund/S000002855) | VANGUARD INSTITUTIONAL INDEX FUNDS | $295K | 0.10% |
| [CORNERCAP SMALL-CAP VALUE FUND](https://search.stillhousedata.com/fund/S000004377) | CORNERCAP GROUP OF FUNDS | $138K | 11.43% |
| [T. Rowe Price Health Sciences Portfolio](https://search.stillhousedata.com/fund/S000002083) | T. ROWE PRICE EQUITY SERIES, INC. | $113K | 1.71% |
| [DWS Small Cap Index VIP](https://search.stillhousedata.com/fund/S000006223) | DEUTSCHE DWS INVESTMENTS VIT FUNDS | $102K | 2.43% |

## More

- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/security/03589W102.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.