Amphastar Pharmaceuticals, Inc. (AMPH) Institutional Ownership & Insider Trading

210 institutions reported holding Amphastar Pharmaceuticals, Inc. shares in 13F filings for the quarter ended 2026-06-30, according to EquiReason's reading of their SEC filings. 12 insider trades on Form 4 since 2025-10-01.

Source: SEC EDGAR filings · figures as of 2026-06-30 · read by EquiReason

AMPHAmphastar Pharmaceuticals, Inc.Follow AMPH — free

Drug Manufacturers - Specialty & Generic · Healthcare

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Market cap: 1.1B
P/E TTM: 14.9
Dividend yield: —
52-week: —
Next earnings: 9 Nov, in 16 days

Institutions · all 13F filers

quarter to 30 Jun 2026 · filers in both quarters

210 institutions held 66.6% of the shares. Across filers that reported both quarters, shares held changed -12.3%.

Largest moves, shares (millions)

Institutional flow by quarter

net shares added or trimmed, millions · filers in both quarters

Quarter	Holders	Shares held, M	Change	Increased	New	Decreased	Closed
Jun 26	210	28	-12.3%	61	24	72	27
Mar 26	213	32	-8.3%	61	20	91	40
Dec 25	234	35	+5.9%	90	16	80	30
Sep 25	238	33	+0.0%	75	28	85	29
Jun 25	241	33	-1.7%	88	38	69	36
Mar 25	238	33	-4.8%	76	26	88	44
Dec 24	262	35	+0.1%	76	28	84	41
Sep 24	274	35	+0.6%	89	29	83	28

Amphastar Pharmaceuticals, Inc. — questions

Who owns Amphastar Pharmaceuticals, Inc. stock?: 210 institutions reported Amphastar Pharmaceuticals, Inc. shares in 13F filings for the quarter ended 2026-06-30. The largest: BlackRock, Inc. (12.3%), DIMENSIONAL FUND ADVISORS LP (5.4%), STATE STREET CORP (3.9%).
Are Amphastar Pharmaceuticals, Inc. insiders buying or selling?: 12 insider trades on Form 4 since 2025-10-01; the full list, with dates, people and plan status, is on this page.

Every figure on this page comes from Amphastar Pharmaceuticals, Inc.'s own SEC filings — see them on SEC EDGAR. Price data is licensed and shown only inside the product.

How these figures are read: methodology · EquiReason.

Important information. Figures on this page are taken from filings submitted to the U.S. Securities and Exchange Commission (SEC) and processed automatically by EquiReason. They may contain errors, omissions or delays, and EquiReason makes no representation or warranty as to their accuracy, completeness or timeliness. Always verify figures against the original filing on SEC EDGAR before relying on them.

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