Zhang Jack Y.

CIK 00016111571 companyRANCHO CUCAMONGA, CA

SEC Profile

Transactions

Companies

Filings

CIK

0001611157

Recent Transactions

50 trades

Exercise/Conversion
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2025-06-13$13.03/sh+200,000→ 2,847,659 total
Exercise/Conversion
Amphastar Pharmaceuticals, Inc.$AMPH
Employee Stock Option (right to buy)
2025-06-13−200,000→ 205,003 total
Tax Payment
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2025-03-17$27.69/sh−16,150→ 2,647,659 total
Tax Payment
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2025-03-17$27.69/sh−7,223→ 1,185,475 total
Tax Payment
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2025-03-15$26.66/sh−4,115→ 1,192,698 total
Tax Payment
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2025-03-15$26.66/sh−9,765→ 2,663,809 total
Exercise/Conversion
Amphastar Pharmaceuticals, Inc.$AMPH
Employee Stock Option (right to buy)
2025-03-14−211,213→ 0 total
Exercise/Conversion
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2025-03-14$14.69/sh+290,477→ 2,899,859 total
Exercise/Conversion
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2025-03-14$14.69/sh+211,213→ 1,359,470 total
Exercise/Conversion
Amphastar Pharmaceuticals, Inc.$AMPH
Employee Stock Option (right to buy)
2025-03-14−290,477→ 0 total
Tax Payment
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2025-03-14$26.66/sh−162,657→ 1,196,813 total
Tax Payment
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2025-03-14$26.66/sh−226,285→ 2,673,574 total
Award
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2025-03-10+48,996→ 1,148,257 total
Award
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2025-03-10+116,226→ 2,609,382 total
Award
Amphastar Pharmaceuticals, Inc.$AMPH
Employee Stock Option (right to buy)
2025-03-10+246,821→ 246,821 total
Award
Amphastar Pharmaceuticals, Inc.$AMPH
Employee Stock Option (right to buy)
2025-03-10+104,052→ 104,052 total
Tax Payment
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2025-03-06$28.32/sh−9,645→ 2,493,156 total
Tax Payment
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2025-03-06$28.32/sh−3,069→ 1,099,261 total
Tax Payment
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2025-03-04$27.62/sh−2,426→ 1,102,330 total
Tax Payment
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2025-03-04$27.62/sh−5,753→ 2,502,801 total
Gift
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2024-11-11−125,000→ 2,508,554 total
Gift
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2024-11-11−125,000→ 1,104,756 total
Exercise/Conversion
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2024-09-13$14.69/sh+100,000→ 2,633,554 total
Exercise/Conversion
Amphastar Pharmaceuticals, Inc.$AMPH
Employee Stock Option (right to buy)
2024-09-13−100,000→ 290,477 total
Exercise/Conversion
Amphastar Pharmaceuticals, Inc.$AMPH
Employee Stock Option (right to buy)
2024-06-10−100,000→ 390,477 total
Exercise/Conversion
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2024-06-10$14.69/sh+100,000→ 2,533,554 total
Tax Payment
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2024-03-17$43.05/sh−7,052→ 1,229,756 total
Tax Payment
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2024-03-17$43.05/sh−15,768→ 2,433,554 total
Exercise/Conversion
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2024-03-15$12.46/sh+310,930→ 1,439,466 total
Tax Payment
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2024-03-15$43.05/sh−408,721→ 2,449,322 total
Exercise/Conversion
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2024-03-15$12.46/sh+722,046→ 2,858,043 total
Exercise/Conversion
Amphastar Pharmaceuticals, Inc.$AMPH
Employee Stock Option (right to buy)
2024-03-15−310,930→ 0 total
Exercise/Conversion
Amphastar Pharmaceuticals, Inc.$AMPH
Employee Stock Option (right to buy)
2024-03-15−722,046→ 0 total
Tax Payment
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2024-03-15$43.05/sh−202,658→ 1,236,808 total
Tax Payment
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2024-03-06$46.31/sh−2,990→ 1,128,536 total
Tax Payment
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2024-03-06$46.31/sh−7,031→ 2,135,997 total
Award
Amphastar Pharmaceuticals, Inc.$AMPH
Employee Stock Option (right to buy)
2024-03-04+135,473→ 135,473 total
Award
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2024-03-04+64,310→ 2,143,028 total
Award
Amphastar Pharmaceuticals, Inc.$AMPH
Employee Stock Option (right to buy)
2024-03-04+57,109→ 57,109 total
Award
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2024-03-04+27,110→ 1,131,526 total
Sale
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2024-01-10$55.95/sh−920→ 1,106,132 total
Sale
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2024-01-10$54.32/sh−78,236→ 1,157,566 total
Sale
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2024-01-10$54.89/sh−50,514→ 1,107,052 total
Sale
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2024-01-10$57.00/sh−1,716→ 1,104,416 total
Sale
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2024-01-09$58.35/sh−3,714→ 1,235,802 total
Sale
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2024-01-09$57.70/sh−31,764→ 1,239,516 total
Sale
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2024-01-09$56.70/sh−50,678→ 1,271,280 total
Sale
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2024-01-08$63.27/sh−2,152→ 1,321,958 total
Sale
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2024-01-08$59.24/sh−37,865→ 1,357,597 total
Sale
Amphastar Pharmaceuticals, Inc.$AMPH
Common Stock
2024-01-08$61.19/sh−4,261→ 1,325,773 total

Companies

Amphastar Pharmaceuticals, Inc.
Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner
$AMPH

Recent Filings

Address

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

RANCHO CUCAMONGA, CA, 91730

View on SEC.gov