Canonical: https://ownershiptrace.com/13f/companies/3535

# Who owns Amphastar Pharmaceuticals, Inc. (AMPH)? Elite investor 13F holders

4 tracked elite investors reported holding Amphastar Pharmaceuticals, Inc as of 2026-06-30, including Oaktree Capital Management, D.E. Shaw, Renaissance Technologies LLC, Gotham Asset Management. Who bought, trimmed or exited each quarter, with links to the original SEC 13F filings.

4 tracked investors currently reported holding · Latest report period: 2026-06-30 · Health Care · Pharmaceuticals, Biotechnology & Life Sciences

Amphastar Pharmaceuticals, Inc., a bio-pharmaceutical company, develops, manufactures, markets, and sells generic and proprietary injectable, inhalation, and intranasal products in the United States, China, and France. It offers BAQSIMI, a dry nasal spray used in an emergency for the treatment of severe hypoglycemia; Primatene MIST, an epinephrine inhalation product for the temporary relief of…

## Reported holders and securities, including exits (up to 20)

| Investor | Security | Instrument | Report period | Filed | Value | Quantity | Units | Change | Source |
|  --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| [Oaktree Capital Management](https://ownershiptrace.com/13f/investors/44) | AMPHASTAR PHARMACEUTICALS INC | SHARE | 2026-06-30 | 2026-08-14 00:00:00 | 37200800.00 USD | 40880000.000000 | Principal | add | [Original filing](https://www.sec.gov/Archives/edgar/data/949509/0000949509-26-000005-index.html) |
| [D.E. Shaw](https://ownershiptrace.com/13f/investors/98) | AMPHASTAR PHARMACEUTICALS IN | SHARE | 2026-06-30 | 2026-08-14 00:00:00 | 17900629.00 USD | 887048.000000 | Shares | add | [Original filing](https://www.sec.gov/Archives/edgar/data/1009207/0001104659-26-097217-index.html) |
| [Renaissance Technologies LLC](https://ownershiptrace.com/13f/investors/63) | AMPHASTAR PHARMACEUTICALS IN | SHARE | 2026-06-30 | 2026-08-13 00:00:00 | 10596518.00 USD | 525100.000000 | Shares | reduce | [Original filing](https://www.sec.gov/Archives/edgar/data/1037389/0001037389-26-000059-index.html) |
| [Gotham Asset Management](https://ownershiptrace.com/13f/investors/94672) | AMPHASTAR PHARMACEUTICALS IN | SHARE | 2026-06-30 | 2026-08-14 00:00:00 | 204605.00 USD | 10139.000000 | Shares | buy | [Original filing](https://www.sec.gov/Archives/edgar/data/1510387/0001398344-26-014644-index.html) |

Public disclosures can be delayed, incomplete, or amended. Report period describes a position date; transaction date describes a reported transaction; filed describes submission. A recent filing or page update does not establish a current holding. A dash means unavailable or not comparable, not zero.

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