Stocks
AMPH Amphastar Pharmaceuticals, Inc.

AMPH

Amphastar Pharmaceuticals, Inc.

Company with tickers: AMPH

CIK

1297184

CUSIP

03209R103

Shares Outstanding

44,092,919

Price History Institutional Holders Short Volume Short Interest Fails to Deliver Financials SEC Filings Earnings Calls Insider Trades Congressional Trades

Date	Insider	Role	Type	Shares	Price	Value	After
2026-03-15	Liawatidewi Yakob	Director, EVP CORP ADMIN CENTER	Other	2,459	—	—	2,459
2026-03-15	Liawatidewi Yakob	Director, EVP CORP ADMIN CENTER	Tax	1,033	$18.18	$18,780	121,892
2026-03-15	Zhou Rong	SENIOR EVP, PRODUCTION CENTER	Other	99,668	—	—	99,668
2026-03-15	Zhou Rong	SENIOR EVP, PRODUCTION CENTER	Tax	1,225	$18.18	$22,271	171,554
2026-03-15	Zhang Jack Y.	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	Tax	9,784	$18.18	$177,873	2,990,052
2026-03-15	Zhang Jack Y.	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	Other	6,827,679	—	—	6,827,679
2026-03-15	Zhang Jack Y.	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	Tax	2,908	$18.18	$52,867	1,245,125
2026-03-15	Zhou Rong	SENIOR EVP, PRODUCTION CENTER	Other	5,000	—	—	5,000
2026-03-15	PETERS WILLIAM J	Director, CFO, EVP & TREASURER	Tax	1,973	$18.18	$35,869	175,063
2026-03-10	Zhang Jack Y.	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	Tax	14,785	$18.91	$279,584	2,999,836
2026-03-10	Zhang Jack Y.	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	Tax	4,395	$18.91	$83,109	1,248,033
2026-03-10	PETERS WILLIAM J	Director, CFO, EVP & TREASURER	Tax	3,297	$18.91	$62,346	177,036
2026-03-10	Zhou Rong	SENIOR EVP, PRODUCTION CENTER	Tax	2,215	$18.91	$41,886	172,779
2026-03-10	Liawatidewi Yakob	Director, EVP CORP ADMIN CENTER	Tax	1,870	$18.91	$35,362	122,925
2026-03-09	Zhang Jack Y.	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	Other	6,827,679	—	—	6,827,679
2026-03-09	Zhang Jack Y.	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	Award	72,462	—	—	1,252,428
2026-03-09	Zhang Jack Y.	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	Award	372,338	—	—	372,338
2026-03-09	Zhang Jack Y.	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	Award	180,504	—	—	3,014,621
2026-03-09	Zhang Jack Y.	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	Award	149,472	—	—	149,472
2026-03-09	PETERS WILLIAM J	Director, CFO, EVP & TREASURER	Award	121,071	—	—	121,071
2026-03-09	PETERS WILLIAM J	Director, CFO, EVP & TREASURER	Award	58,693	—	—	180,333
2026-03-09	Zhou Rong	SENIOR EVP, PRODUCTION CENTER	Award	39,432	—	—	174,994
2026-03-09	Zhou Rong	SENIOR EVP, PRODUCTION CENTER	Award	81,341	—	—	81,341
2026-03-09	Zhou Rong	SENIOR EVP, PRODUCTION CENTER	Other	5,000	—	—	5,000
2026-03-09	Zhou Rong	SENIOR EVP, PRODUCTION CENTER	Other	99,668	—	—	99,668
2026-03-09	Liawatidewi Yakob	Director, EVP CORP ADMIN CENTER	Award	73,126	—	—	73,126
2026-03-09	Liawatidewi Yakob	Director, EVP CORP ADMIN CENTER	Award	35,450	—	—	124,795
2026-03-09	Liawatidewi Yakob	Director, EVP CORP ADMIN CENTER	Other	2,459	—	—	2,459
2026-03-06	PETERS WILLIAM J	Director, CFO, EVP & TREASURER	Tax	2,146	$19.34	$41,504	121,640
2026-03-06	Zhou Rong	SENIOR EVP, PRODUCTION CENTER	Other	99,668	—	—	99,668
2026-03-06	Zhou Rong	SENIOR EVP, PRODUCTION CENTER	Tax	1,357	$19.34	$26,244	135,562
2026-03-06	Zhou Rong	SENIOR EVP, PRODUCTION CENTER	Other	5,000	—	—	5,000
2026-03-06	Liawatidewi Yakob	Director, EVP CORP ADMIN CENTER	Other	2,459	—	—	2,459
2026-03-06	Liawatidewi Yakob	Director, EVP CORP ADMIN CENTER	Tax	1,144	$19.34	$22,125	89,345
2026-03-06	Zhang Jack Y.	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	Tax	7,773	$19.34	$150,330	2,834,117
2026-03-06	Zhang Jack Y.	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	Tax	3,077	$19.34	$59,509	1,179,966
2026-03-06	Zhang Jack Y.	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	Other	6,827,679	—	—	6,827,679
2026-03-04	Zhang Jack Y.	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	Tax	5,769	$19.96	$115,149	2,841,890
2026-03-04	Zhang Jack Y.	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	Other	6,827,679	—	—	6,827,679
2026-03-04	Zhang Jack Y.	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	Tax	2,432	$19.96	$48,543	1,183,043
2026-03-04	Zhou Rong	SENIOR EVP, PRODUCTION CENTER	Other	5,000	—	—	5,000
2026-03-04	Zhou Rong	SENIOR EVP, PRODUCTION CENTER	Tax	1,124	$19.96	$22,435	136,919
2026-03-04	Liawatidewi Yakob	Director, EVP CORP ADMIN CENTER	Tax	965	$19.96	$19,261	90,489
2026-03-04	Liawatidewi Yakob	Director, EVP CORP ADMIN CENTER	Other	2,459	—	—	2,459
2026-03-04	PETERS WILLIAM J	Director, CFO, EVP & TREASURER	Tax	1,744	$19.96	$34,810	123,786
2026-03-04	Zhou Rong	SENIOR EVP, PRODUCTION CENTER	Other	99,668	—	—	99,668
2025-12-17	Zhou Rong	SENIOR EVP, PRODUCTION CENTER	Other	99,668	—	—	99,668
2025-12-17	Zhou Rong	SENIOR EVP, PRODUCTION CENTER	Convert	9,787	—	—	0
2025-12-17	Zhou Rong	SENIOR EVP, PRODUCTION CENTER	Other	5,000	—	—	5,000
2025-12-17	Zhou Rong	SENIOR EVP, PRODUCTION CENTER	Convert	9,787	$11.33	$110,887	147,830
2025-12-17	Zhou Rong	SENIOR EVP, PRODUCTION CENTER	Sell	9,787	$26.20	$256,379	138,043
2025-12-12	Petersen Floyd F.	Director	Sell	2,426	$25.92	$62,888	71,368
2025-12-11	Petersen Floyd F.	Director	Sell	1,737	$25.69	$44,620	73,794
2025-11-25	PRINS RICHARD K	Director	Convert	4,179	—	—	0
2025-11-25	PRINS RICHARD K	Director	Sell	4,179	$27.10	$113,253	35,183
2025-11-25	PRINS RICHARD K	Director	Convert	4,179	$16.69	$69,748	39,362
2025-11-13	Petersen Floyd F.	Director	Sell	16,679	$26.49	$441,837	75,531
2025-11-13	Petersen Floyd F.	Director	Convert	16,679	$16.69	$278,373	92,210
2025-11-13	Petersen Floyd F.	Director	Convert	16,679	—	—	0
2025-11-03	Petersen Floyd F.	Director	Sell	500	$25.27	$12,633	75,531
2025-10-01	Petersen Floyd F.	Director	Sell	500	$27.20	$13,602	76,031
2025-09-02	Petersen Floyd F.	Director	Sell	500	$30.98	$15,492	76,531
2025-08-01	Petersen Floyd F.	Director	Sell	500	$20.83	$10,416	77,031
2025-07-18	Gaugh David Russell	Director	Award	6,304	—	—	6,304
2025-07-18	Gaugh David Russell	Director	Award	13,987	—	—	13,987
2025-07-18	Gaugh David Russell	Director	Other	0	—	—	0
2025-07-02	Petersen Floyd F.	Director	Sell	500	$23.47	$11,734	77,531
2025-06-13	Zhang Jack Y.	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	Convert	200,000	—	—	205,003
2025-06-13	Zhang Jack Y.	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	Other	1,185,475	—	—	1,185,475
2025-06-13	Zhang Jack Y.	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	Convert	200,000	$13.03	$2,606,000	2,847,659
2025-06-13	Zhang Jack Y.	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	Other	6,827,679	—	—	6,827,679
2025-06-03	Lee Howard	Director	Tax	923	$26.01	$24,007	151,976
2025-06-02	Lee Howard	Director	Award	11,402	—	—	11,402
2025-06-02	Lee Howard	Director	Award	5,122	—	—	152,899
2025-06-02	Petersen Floyd F.	Director	Sell	500	$25.67	$12,835	72,909
2025-06-02	Petersen Floyd F.	Director	Award	5,122	—	—	78,031
2025-06-02	Petersen Floyd F.	Director	Award	11,402	—	—	11,402
2025-06-02	Deflin Gayle	Director	Award	11,402	—	—	11,402
2025-06-02	Deflin Gayle	Director	Award	5,122	—	—	10,914
2025-06-02	Gerst Diane G.	Director	Award	5,122	—	—	23,756
2025-06-02	Gerst Diane G.	Director	Award	11,402	—	—	11,402
2025-06-02	PRINS RICHARD K	Director	Award	11,402	—	—	11,402
2025-06-02	PRINS RICHARD K	Director	Award	5,122	—	—	35,183
2025-06-02	ZASLOFF MICHAEL A	Director	Award	5,122	—	—	29,524
2025-06-02	ZASLOFF MICHAEL A	Director	Award	11,402	—	—	11,402
2025-05-19	PETERS WILLIAM J	Director, CFO, EVP & TREASURER	Tax	273	$24.79	$6,768	124,985
2025-05-01	Petersen Floyd F.	Director	Sell	500	$24.08	$12,041	73,409
2025-04-01	Petersen Floyd F.	Director	Sell	500	$28.38	$14,190	73,909
2025-03-17	Zhou Rong	SENIOR EVP, PRODUCTION CENTER	Tax	1,967	$27.69	$54,466	137,497
2025-03-17	Zhang Jack Y.	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	Tax	7,223	$27.69	$200,005	1,185,475
2025-03-17	Zhang Jack Y.	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	Tax	16,150	$27.69	$447,194	2,647,659
2025-03-17	PETERS WILLIAM J	Director, CFO, EVP & TREASURER	Tax	3,004	$27.69	$83,181	125,258
2025-03-17	Liawatidewi Yakob	Director, EVP CORP ADMIN CENTER	Tax	1,731	$27.69	$47,931	90,909
2025-03-15	Zhou Rong	SENIOR EVP, PRODUCTION CENTER	Tax	1,222	$26.66	$32,579	139,464
2025-03-15	Zhou Rong	SENIOR EVP, PRODUCTION CENTER	Other	99,668	—	—	99,668
2025-03-15	Zhou Rong	SENIOR EVP, PRODUCTION CENTER	Other	5,000	—	—	5,000
2025-03-15	Zhang Jack Y.	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	Tax	4,115	$26.66	$109,706	1,192,698
2025-03-15	Zhang Jack Y.	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	Tax	9,765	$26.66	$260,335	2,663,809
2025-03-15	PETERS WILLIAM J	Director, CFO, EVP & TREASURER	Tax	1,968	$26.66	$52,467	128,262
2025-03-15	Liawatidewi Yakob	Director, EVP CORP ADMIN CENTER	Tax	1,031	$26.66	$27,486	92,640