Amphastar Pharmaceuticals, Inc. 13F holders
Of the 44 funds followed here, 7 reported a position in Amphastar Pharmaceuticals, Inc. in a 13F for the quarter ended 30 June 2026. The largest: Geode Capital Management, 969,840 shares worth $19.6 million, 0.0% of its reported book. New this quarter: Point72 Asset Management.
| Fund | Shares | Value | Of its book | Change on the quarter | Status | Quarter ended | Filing |
|---|---|---|---|---|---|---|---|
| Geode Capital Management | 969,840 | $19.6 million | 0.0% | -6,810 | trimmed | 30 June 2026 | 13F |
| Renaissance Technologies | 525,100 | $10.6 million | 0.0% | -28,800 | trimmed | 30 June 2026 | 13F |
| Two Sigma Investments | 248,115 | $5.0 million | 0.0% | +109,967 | added | 30 June 2026 | 13F |
| Point72 Asset Management | 54,964 | $1.1 million | 0.0% | +54,964 | new | 30 June 2026 | 13F |
| Citadel Advisors | 37,631 | $759,394 | 0.0% | -47,809 | trimmed | 30 June 2026 | 13F |
| Millennium Management | 31,814 | $642,007 | 0.0% | -339,559 | trimmed | 30 June 2026 | 13F |
| FMR LLC | 28,958 | $584,363 | 0.0% | +27,664 | added | 30 June 2026 | 13F |
Value is what the fund reported.
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Change is shares against the fund's previous 13F; a fund with one filing read shows no change. 13Fs cover long US positions of managers above $100 million and are filed up to 45 days after the quarter.Schedule 13D and 13G filed on the name, last twelve months
| Filed | Schedule | Who | Holding | Of the class | Event date | Rule or purpose | Filing |
|---|---|---|---|---|---|---|---|
| 14 July 2026 | 13G | Dimensional Fund Advisors LP and 1 other | 2.3 million | 5.2% | 30 June 2026 | passive, institutional (13d-1(b)) | EDGAR |
| 26 March 2026 | 13G/A | The Vanguard Group and 1 other | 0 | 0.0% | 13 March 2026 | passive, institutional (13d-1(b)) | EDGAR |
| 17 October 2025 | 13G/A | BlackRock, Inc. and 1 other | 5.3 million | 11.5% | 30 September 2025 | passive, institutional (13d-1(b)) | EDGAR |
A Schedule 13D is filed by anyone who crosses 5% of a class with intent to influence; a 13G by a passive holder.
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Amendments (/A) report a change, including an exit to zero. Holding and percentage are as the filer stated them on the cover page; the purpose is the filer's own words, cut short.Fails to deliver
| Settlement date | Shares failed | Price | File |
|---|---|---|---|
| 14 September 2026 | 787 | $23.78 | SEC |
| 26 August 2026 | 4 | $21.98 | SEC |
| 20 August 2026 | 13,708 | $21.74 | SEC |
| 14 August 2026 | 67 | $20.18 | SEC |
| 13 August 2026 | 3 | $19.98 | SEC |
| 12 August 2026 | 1,342 | $20.42 | SEC |
| 11 August 2026 | 1 | $20.31 | SEC |
| 4 August 2026 | 114 | $20.22 | SEC |
Shares that failed to deliver at settlement, per day, from the SEC's half-month files, which arrive about two weeks after the period.
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Largest in the window: 13,708 on 20 August 2026. A fail is an operational fact about settlement, not a position.Source
Each fund's 13F-HR on EDGAR, linked per row; positions matched to AMPH by CUSIP from the SEC's own fails-to-deliver files; Schedule 13D and 13G from the company's own filing index, each read to confirm the company is the issuer named.
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