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AMPHASTAR PHARMACEUTICALS INC COM (AMPH)

Institutional ownership, SEC filings and insider activity

Sector: Healthcare & Pharma · SEC CIK 0001297184 · EDGAR filings · Updated 2026-07-14

AMPHASTAR PHARMACEUTICALS INC COM (AMPH) has reported institutional ownership of 72.8%, with 213 institutional managers holding positions valued at $628.8M per the latest 13F reporting period. SEC filings include an active substantial-doubt (going concern) disclosure per the filings.

Latest updates

• 2026-07-14 — SCHEDULE 13G filed
• 2026-07-13 — Insider transaction reported (Form 4)
• 2026-07-13 — Initial insider ownership filed (Form 3)
• 2026-07-13 — Current report (8-K) filed
• 2026-07-08 — Current report (8-K) filed
• 2026-06-03 — Insider transaction reported (Form 4)

Institutional ownership overview

According to SEC 13F filings tracked by Sightfile, AMPHASTAR PHARMACEUTICALS INC COM has 213 institutional holders and institutional ownership of 72.8%.

Insider activity

Insiders reported 51 transactions (0 buys, 13 sells) across 12 reporting insiders, with a net reported value of −$1.02M.

Data flags from SEC filings

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