Insider · CIK 0001611157

Zhang Jack Y.

Reports to the SEC for 1 company · RANCHO CUCAMONGA, CA

sec.gov

Transactions

Companies

Filings

CIK

0001611157

Forms 4 and 5

Insider transactions

50 trades

Date	Company	Role	Code	Shares	Price	Value	Shares after
2026-03-15	AMPHAmphastar Pharmaceuticals, Inc.F Tax Payment	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	FTax Payment	−9,784 sh	$18.18	−$178K	2,990,052
2026-03-15	AMPHAmphastar Pharmaceuticals, Inc.F Tax Payment	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	FTax Payment	−2,908 sh	$18.18	−$52.9K	1,245,125
2026-03-10	AMPHAmphastar Pharmaceuticals, Inc.F Tax Payment	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	FTax Payment	−14.8K sh	$18.91	−$280K	2,999,836
2026-03-10	AMPHAmphastar Pharmaceuticals, Inc.F Tax Payment	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	FTax Payment	−4,395 sh	$18.91	−$83.1K	1,248,033
2026-03-09	AMPHAmphastar Pharmaceuticals, Inc.A Award	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	AAward	+181K sh	—	—	3,014,621
2026-03-09	AMPHAmphastar Pharmaceuticals, Inc.A Award	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	AAward	+72.5K sh	—	—	1,252,428
2026-03-09	AMPHAmphastar Pharmaceuticals, Inc. · Employee Stock Option (right to buy)A Award	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	AAward	+372K sh	—	—	372,338
2026-03-09	AMPHAmphastar Pharmaceuticals, Inc. · Employee Stock Option (right to buy)A Award	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	AAward	+149K sh	—	—	149,472
2026-03-06	AMPHAmphastar Pharmaceuticals, Inc.F Tax Payment	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	FTax Payment	−7,773 sh	$19.34	−$150K	2,834,117
2026-03-06	AMPHAmphastar Pharmaceuticals, Inc.F Tax Payment	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	FTax Payment	−3,077 sh	$19.34	−$59.5K	1,179,966
2026-03-04	AMPHAmphastar Pharmaceuticals, Inc.F Tax Payment	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	FTax Payment	−5,769 sh	$19.96	−$115K	2,841,890
2026-03-04	AMPHAmphastar Pharmaceuticals, Inc.F Tax Payment	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	FTax Payment	−2,432 sh	$19.96	−$48.5K	1,183,043
2025-06-13	AMPHAmphastar Pharmaceuticals, Inc.M Exercise/Conversion	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	MExercise/Conversion	+200K sh	$13.03	+$2.61M	2,847,659
2025-06-13	AMPHAmphastar Pharmaceuticals, Inc. · Employee Stock Option (right to buy)M Exercise/Conversion	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	MExercise/Conversion	−200K sh	—	—	205,003
2025-03-17	AMPHAmphastar Pharmaceuticals, Inc.F Tax Payment	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	FTax Payment	−16.2K sh	$27.69	−$447K	2,647,659
2025-03-17	AMPHAmphastar Pharmaceuticals, Inc.F Tax Payment	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	FTax Payment	−7,223 sh	$27.69	−$200K	1,185,475
2025-03-15	AMPHAmphastar Pharmaceuticals, Inc.F Tax Payment	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	FTax Payment	−9,765 sh	$26.66	−$260K	2,663,809
2025-03-15	AMPHAmphastar Pharmaceuticals, Inc.F Tax Payment	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	FTax Payment	−4,115 sh	$26.66	−$110K	1,192,698
2025-03-14	AMPHAmphastar Pharmaceuticals, Inc.M Exercise/Conversion	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	MExercise/Conversion	+290K sh	$14.69	+$4.27M	2,899,859
2025-03-14	AMPHAmphastar Pharmaceuticals, Inc.F Tax Payment	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	FTax Payment	−226K sh	$26.66	−$6.03M	2,673,574
2025-03-14	AMPHAmphastar Pharmaceuticals, Inc.M Exercise/Conversion	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	MExercise/Conversion	+211K sh	$14.69	+$3.1M	1,359,470
2025-03-14	AMPHAmphastar Pharmaceuticals, Inc.F Tax Payment	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	FTax Payment	−163K sh	$26.66	−$4.34M	1,196,813
2025-03-14	AMPHAmphastar Pharmaceuticals, Inc. · Employee Stock Option (right to buy)M Exercise/Conversion	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	MExercise/Conversion	−290K sh	—	—	0
2025-03-14	AMPHAmphastar Pharmaceuticals, Inc. · Employee Stock Option (right to buy)M Exercise/Conversion	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	MExercise/Conversion	−211K sh	—	—	0
2025-03-10	AMPHAmphastar Pharmaceuticals, Inc.A Award	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	AAward	+116K sh	—	—	2,609,382
2025-03-10	AMPHAmphastar Pharmaceuticals, Inc.A Award	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	AAward	+49K sh	—	—	1,148,257
2025-03-10	AMPHAmphastar Pharmaceuticals, Inc. · Employee Stock Option (right to buy)A Award	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	AAward	+247K sh	—	—	246,821
2025-03-10	AMPHAmphastar Pharmaceuticals, Inc. · Employee Stock Option (right to buy)A Award	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	AAward	+104K sh	—	—	104,052
2025-03-06	AMPHAmphastar Pharmaceuticals, Inc.F Tax Payment	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	FTax Payment	−9,645 sh	$28.32	−$273K	2,493,156
2025-03-06	AMPHAmphastar Pharmaceuticals, Inc.F Tax Payment	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	FTax Payment	−3,069 sh	$28.32	−$86.9K	1,099,261
2025-03-04	AMPHAmphastar Pharmaceuticals, Inc.F Tax Payment	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	FTax Payment	−5,753 sh	$27.62	−$159K	2,502,801
2025-03-04	AMPHAmphastar Pharmaceuticals, Inc.F Tax Payment	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	FTax Payment	−2,426 sh	$27.62	−$67K	1,102,330
2024-11-11	AMPHAmphastar Pharmaceuticals, Inc.G Gift	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	GGift	−125K sh	—	—	2,508,554
2024-11-11	AMPHAmphastar Pharmaceuticals, Inc.G Gift	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	GGift	−125K sh	—	—	1,104,756
2024-09-13	AMPHAmphastar Pharmaceuticals, Inc.M Exercise/Conversion	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	MExercise/Conversion	+100K sh	$14.69	+$1.47M	2,633,554
2024-09-13	AMPHAmphastar Pharmaceuticals, Inc. · Employee Stock Option (right to buy)M Exercise/Conversion	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	MExercise/Conversion	−100K sh	—	—	290,477
2024-06-10	AMPHAmphastar Pharmaceuticals, Inc.M Exercise/Conversion	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	MExercise/Conversion	+100K sh	$14.69	+$1.47M	2,533,554
2024-06-10	AMPHAmphastar Pharmaceuticals, Inc. · Employee Stock Option (right to buy)M Exercise/Conversion	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	MExercise/Conversion	−100K sh	—	—	390,477
2024-03-17	AMPHAmphastar Pharmaceuticals, Inc.F Tax Payment	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	FTax Payment	−15.8K sh	$43.05	−$679K	2,433,554
2024-03-17	AMPHAmphastar Pharmaceuticals, Inc.F Tax Payment	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	FTax Payment	−7,052 sh	$43.05	−$304K	1,229,756
2024-03-15	AMPHAmphastar Pharmaceuticals, Inc.M Exercise/Conversion	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	MExercise/Conversion	+722K sh	$12.46	+$9M	2,858,043
2024-03-15	AMPHAmphastar Pharmaceuticals, Inc.F Tax Payment	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	FTax Payment	−409K sh	$43.05	−$17.6M	2,449,322
2024-03-15	AMPHAmphastar Pharmaceuticals, Inc.M Exercise/Conversion	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	MExercise/Conversion	+311K sh	$12.46	+$3.87M	1,439,466
2024-03-15	AMPHAmphastar Pharmaceuticals, Inc.F Tax Payment	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	FTax Payment	−203K sh	$43.05	−$8.72M	1,236,808
2024-03-15	AMPHAmphastar Pharmaceuticals, Inc. · Employee Stock Option (right to buy)M Exercise/Conversion	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	MExercise/Conversion	−722K sh	—	—	0
2024-03-15	AMPHAmphastar Pharmaceuticals, Inc. · Employee Stock Option (right to buy)M Exercise/Conversion	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	MExercise/Conversion	−311K sh	—	—	0
2024-03-06	AMPHAmphastar Pharmaceuticals, Inc.F Tax Payment	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	FTax Payment	−7,031 sh	$46.31	−$326K	2,135,997
2024-03-06	AMPHAmphastar Pharmaceuticals, Inc.F Tax Payment	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	FTax Payment	−2,990 sh	$46.31	−$138K	1,128,536
2024-03-04	AMPHAmphastar Pharmaceuticals, Inc.A Award	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	AAward	+64.3K sh	—	—	2,143,028
2024-03-04	AMPHAmphastar Pharmaceuticals, Inc.A Award	Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner	AAward	+27.1K sh	—	—	1,131,526

Recent filings

Accepted (ET)
Mar 174
Luo Mary Z.0000889740-26-000007
SEC(opens sec.gov)
Mar 114
Luo Mary Z.0000889740-26-000005
SEC(opens sec.gov)
Mar 104
Luo Mary Z.0000889740-26-000003
SEC(opens sec.gov)
Mar 64
Luo Mary Z.0001104659-26-024842
SEC(opens sec.gov)
Jun 164
Luo Mary Z.0001415889-25-017423
SEC(opens sec.gov)
Mar 184
Luo Mary Z.0001415889-25-008523
SEC(opens sec.gov)

Companies

Amphastar Pharmaceuticals, Inc.Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% OwnerAMPH

Address

C/O AMPHASTAR PHARMACEUTICALS, INC. 11570 6TH STREET

RANCHO CUCAMONGA, CA, 91730