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Company

Amphastar Pharmaceuticals, Inc.

AMPH · CIK 0001297184

SEC FORM 4
$103,475.00

Amphastar Pharmaceuticals, Inc. (AMPH)

Sale of 4,139 shares at $25 per share.

Reporting Person PETERS WILLIAM J · Officer Title CFO, EVP & TREASURER · Transaction Code S

Traded Sep 21, 2026 · Disclosed Sep 23, 2026

Source: SEC Form 4 · 0001263136-26-000014 · filed 2026-09-23 · View filing →

SEC FORM 4
$133,500.00

Amphastar Pharmaceuticals, Inc. (AMPH)

Acquisition (code M) of 10,000 shares at $13.35 per share.

Reporting Person Zhou Rong · Officer Title SENIOR EVP, PRODUCTION CENTER · Transaction Code M

Traded Sep 16, 2026 · Disclosed Sep 17, 2026

Source: SEC Form 4 · 0001645326-26-000014 · filed 2026-09-17 · View filing →

SEC FORM 4
$239,404.00

Amphastar Pharmaceuticals, Inc. (AMPH)

Sale of 10,000 shares at $23.9404 per share.

Reporting Person Zhou Rong · Officer Title SENIOR EVP, PRODUCTION CENTER · Transaction Code S

Traded Sep 16, 2026 · Disclosed Sep 17, 2026

Source: SEC Form 4 · 0001645326-26-000014 · filed 2026-09-17 · View filing →

SEC FORM 4
$75,305.94

Amphastar Pharmaceuticals, Inc. (AMPH)

Sale of 3,187 shares at $23.6291 per share.

Reporting Person Zhou Rong · Officer Title SENIOR EVP, PRODUCTION CENTER · Transaction Code S

Traded Sep 2, 2026 · Disclosed Sep 3, 2026

Source: SEC Form 4 · 0001645326-26-000012 · filed 2026-09-03 · View filing →

SEC FORM 4
$161,851.90

Amphastar Pharmaceuticals, Inc. (AMPH)

Sale of 7,973 shares at $20.30 per share.

Reporting Person PRINS RICHARD K · Transaction Code S

Traded Aug 11, 2026 · Disclosed Aug 12, 2026

Source: SEC Form 4 · 0001047579-26-000005 · filed 2026-08-12 · View filing →