# AMPHASTAR PHARMACEUTICALS IN COM

AMPHASTAR PHARMACEUTICALS IN COM is a security (CUSIP 03209R103) tracked across SEC portfolio filings. 221 institutional managers reported $569.6M on Form 13F as of 2026-06-30; 18 registered fund positions totaling $21.9M via N-PORT as of 2026-05-31.

## Summary

- Issuer: AMPHASTAR PHARMACEUTICALS IN
- Class: COM
- CUSIP: 03209R103
- Asset category: EC
- 13F holders: 221
- 13F value: $569.6M
- 13F period: 2026-06-30
- N-PORT fund positions: 18
- N-PORT value: $21.9M
- N-PORT report: 2026-05-31

## Top institutional holders (Form 13F)

_Showing 15 of 221 managers by value._

| Manager | Location | Value | Shares |
| --- | --- | --- | --- |
| BlackRock, Inc. | New York, NY | $106.2M | 5,421,343 |
| [VANGUARD GROUP INC](https://search.stillhousedata.com/firm/105958) | Valley Forge, PA | $69.8M | 2,608,158 |
| DIMENSIONAL FUND ADVISORS LP | AUSTIN, TX | $39.7M | 2,027,947 |
| STATE STREET CORP | BOSTON, MA | $31.5M | 1,607,515 |
| FULLER & THALER ASSET MANAGEMENT, INC. | San Mateo, CA | $27.3M | 1,395,139 |
| [MARSHALL WACE, LLP](https://search.stillhousedata.com/firm/160885) | LONDON, X0 | $20.1M | 1,025,640 |
| AMERICAN CENTURY COMPANIES INC | KANSAS CITY, MO | $19.9M | 1,017,538 |
| [GEODE CAPITAL MANAGEMENT, LLC](https://search.stillhousedata.com/firm/115504) | BOSTON, MA | $19.1M | 976,650 |
| [Epoch Investment Partners, Inc.](https://search.stillhousedata.com/firm/131556) | New York, NY | $17.6M | 898,895 |
| D. E. Shaw & Co., Inc. | New York, NY | $13.0M | 665,542 |
| [RENAISSANCE TECHNOLOGIES LLC](https://search.stillhousedata.com/firm/106661) | NEW YORK, NY | $10.9M | 553,900 |
| [SYSTEMATIC FINANCIAL MANAGEMENT LP](https://search.stillhousedata.com/firm/106146) | TEANECK, NJ | $8.6M | 439,870 |
| MORGAN STANLEY | NEW YORK, NY | $8.2M | 420,337 |
| UBS Group AG | Zurich, V8 | $8.2M | 420,263 |
| [ROYCE & ASSOCIATES LP](https://search.stillhousedata.com/firm/107689) | New York, NY | $8.0M | 406,175 |

## Top fund holders (N-PORT)

_Showing 15 of 18 fund positions by value._

| Fund | Registrant | Value | % of fund |
| --- | --- | --- | --- |
| [VANGUARD EXTENDED MARKET INDEX FUND](https://search.stillhousedata.com/fund/S000002841) | VANGUARD INDEX FUNDS | $7.8M | 0.95% |
| [U.S. MICRO CAP PORTFOLIO](https://search.stillhousedata.com/fund/S000000948) | DFA INVESTMENT DIMENSIONS GROUP INC | $4.2M | 5.63% |
| [VANGUARD RUSSELL 2000 INDEX FUND](https://search.stillhousedata.com/fund/S000030003) | VANGUARD SCOTTSDALE FUNDS | $3.5M | 1.98% |
| [Royce Capital Fund - Small-Cap Portfolio](https://search.stillhousedata.com/fund/S000009497) | ROYCE CAPITAL FUND | $1.8M | 105.34% |
| [Master Small Cap Index Series](https://search.stillhousedata.com/fund/S000002716) | Quantitative Master Series LLC | $1.2M | 2.41% |
| [Goldman Sachs ActiveBeta(R) U.S. Small Cap Equity ETF](https://search.stillhousedata.com/fund/S000048296) | Goldman Sachs ETF Trust | $925K | 9.37% |
| [Pear tree polaris small cap fund](https://search.stillhousedata.com/fund/S000009493) | Pear Tree Funds | $847K | 92.00% |
| ROYCE SMALL-CAP TRUST, INC. | ROYCE SMALL-CAP TRUST, INC. | $607K | 2.72% |
| [CORNERCAP SMALL-CAP VALUE FUND](https://search.stillhousedata.com/fund/S000004377) | CORNERCAP GROUP OF FUNDS | $499K | 41.50% |
| [VANGUARD BALANCED INDEX FUND](https://search.stillhousedata.com/fund/S000002560) | VANGUARD VALLEY FORGE FUNDS | $389K | 0.07% |
| [BNY Mellon Smallcap Stock Index Fund](https://search.stillhousedata.com/fund/S000000132) | BNY MELLON INDEX FUNDS, INC. | $386K | 4.56% |
| [VANGUARD INSTITUTIONAL TOTAL STOCK MARKET INDEX FUND](https://search.stillhousedata.com/fund/S000002855) | VANGUARD INSTITUTIONAL INDEX FUNDS | $357K | 0.12% |
| [DWS Small Cap Index VIP](https://search.stillhousedata.com/fund/S000006223) | DEUTSCHE DWS INVESTMENTS VIT FUNDS | $98K | 2.34% |
| [Federated Hermes Global Allocation Fund](https://search.stillhousedata.com/fund/S000009117) | Federated Hermes Global Allocation Fund | $50K | 1.70% |
| [TIAA Separate Account VA-1 - Stock Index Account](https://search.stillhousedata.com/fund/S000005098) | TIAA Separate Account VA-1 | $15K | 0.12% |

## More

- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/security/03209R103.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.