AMPHASTAR PHARMACEUTICALS IN

Ticker: AMPH CUSIP: 03209R103 Class: Common Stock

GROUP ONE TRADING, L.P.'s Holding History (CIK: 0000932540)

Note: Option positions (PUT/CALL) are excluded.

Q4 2025
Shares 1,741 Value ($000) $47 Avg Close $25.76 Range $22.94 - $29.00
Q3 2025
Shares 2,071 Value ($000) $55 Avg Close $25.82 Range $20.39 - $31.26
Q2 2024
Shares 814 Value ($000) $33 Avg Close $41.44 Range $38.43 - $46.62
Q2 2023
Shares 394 Value ($000) $23 Avg Close $44.33 Range $35.62 - $58.70
Q1 2023
Shares 100 Value ($000) $4 Avg Close $32.78 Range $27.58 - $38.22
Q2 2022
Shares 3,826 Value ($000) $133 Avg Close $35.69 Range $28.64 - $44.46
Q1 2022
Shares 2,500 Value ($000) $90 Avg Close $28.36 Range $22.07 - $37.16
Q2 2021
Shares 100 Value ($000) $2 Avg Close $18.84 Range $16.91 - $20.94
Q2 2017
Shares 801 Value ($000) $14 Avg Close $15.86 Range $13.15 - $17.95
Q1 2017
Shares 1,601 Value ($000) $23 Avg Close $15.72 Range $12.05 - $19.64
Q4 2016
Shares 1,301 Value ($000) $24 Avg Close $19.45 Range $16.87 - $21.75