AMPHASTAR PHARMACEUTICALS IN

Ticker: AMPH CUSIP: 03209R103 Class: Common Stock

ACADIAN ASSET MANAGEMENT LLC's Holding History (CIK: 0000916542)

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

Q4 2025

Shares 9,332 Value ($000) $0 Avg Close $25.76 Range $22.94 - $29.00

Q3 2025

Shares 44,349 Value ($000) $1 Avg Close $25.82 Range $20.39 - $31.26

Q3 2024

Shares 718 Value ($000) $0 Avg Close $43.89 Range $36.56 - $50.62

Q4 2022

Shares 23,870 Value ($000) $1 Avg Close $29.04 Range $26.76 - $31.64

Q3 2022

Shares 107,173 Value ($000) $3,008 Avg Close $32.65 Range $27.10 - $39.07

Q2 2022

Shares 128,734 Value ($000) $4,477 Avg Close $35.69 Range $28.64 - $44.46

Q1 2022

Shares 110,148 Value ($000) $3,949 Avg Close $28.36 Range $22.07 - $37.16

Q4 2021

Shares 23,035 Value ($000) $534 Avg Close $20.45 Range $18.12 - $23.85

Q3 2021

Shares 18,502 Value ($000) $350 Avg Close $19.59 Range $17.56 - $21.63

Q2 2021

Shares 99,435 Value ($000) $2,004 Avg Close $18.84 Range $16.91 - $20.94

Q1 2021

Shares 12,619 Value ($000) $231 Avg Close $18.59 Range $17.11 - $20.93

Q4 2020

Shares 5,554 Value ($000) $112 Avg Close $19.46 Range $17.51 - $21.38

Q3 2020

Shares 17,672 Value ($000) $331 Avg Close $20.14 Range $17.83 - $22.69

Q2 2020

Shares 28,635 Value ($000) $642 Avg Close $18.31 Range $14.00 - $22.50

Q4 2019

Shares 5,076 Value ($000) $98 Avg Close $19.18 Range $16.71 - $20.89

Q3 2019

Shares 39,713 Value ($000) $788 Avg Close $20.83 Range $18.66 - $22.85

Q2 2019

Shares 4,200 Value ($000) $88 Avg Close $20.90 Range $18.60 - $23.06

Q4 2018

Shares 3,202 Value ($000) $63 Avg Close $19.71 Range $17.71 - $22.74

Q2 2018

Shares 19,841 Value ($000) $302 Avg Close $17.48 Range $14.40 - $19.94

Q1 2018

Shares 168,084 Value ($000) $3,152 Avg Close $18.80 Range $16.76 - $20.45

Q4 2017

Shares 171,262 Value ($000) $3,295 Avg Close $18.67 Range $17.00 - $19.95

Q3 2017

Shares 194,797 Value ($000) $3,481 Avg Close $16.45 Range $14.53 - $18.67

Q2 2017

Shares 328,807 Value ($000) $5,872 Avg Close $15.86 Range $13.15 - $17.95

Q1 2017

Shares 570,814 Value ($000) $8,277 Avg Close $15.72 Range $12.05 - $19.64

Q4 2016

Shares 1,502,151 Value ($000) $27,668 Avg Close $19.45 Range $16.87 - $21.75

Q3 2016

Shares 1,573,986 Value ($000) $29,858 Avg Close $18.15 Range $15.62 - $21.53

Q2 2016

Shares 818,620 Value ($000) $13,195 Avg Close $14.11 Range $11.41 - $16.78

Q1 2016

Shares 452,371 Value ($000) $5,428 Avg Close $11.79 Range $10.50 - $14.18

Q4 2015

Shares 315,555 Value ($000) $4,490 Avg Close $13.21 Range $10.57 - $15.84

Q3 2015

Shares 29,153 Value ($000) $340 Avg Close $15.00 Range $10.61 - $18.30

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	9,332	$0	$25.76	$22.94 - $29.00
Q3 2025	44,349	$1	$25.82	$20.39 - $31.26
Q3 2024	718	$0	$43.89	$36.56 - $50.62
Q4 2022	23,870	$1	$29.04	$26.76 - $31.64
Q3 2022	107,173	$3,008	$32.65	$27.10 - $39.07
Q2 2022	128,734	$4,477	$35.69	$28.64 - $44.46
Q1 2022	110,148	$3,949	$28.36	$22.07 - $37.16
Q4 2021	23,035	$534	$20.45	$18.12 - $23.85
Q3 2021	18,502	$350	$19.59	$17.56 - $21.63
Q2 2021	99,435	$2,004	$18.84	$16.91 - $20.94
Q1 2021	12,619	$231	$18.59	$17.11 - $20.93
Q4 2020	5,554	$112	$19.46	$17.51 - $21.38
Q3 2020	17,672	$331	$20.14	$17.83 - $22.69
Q2 2020	28,635	$642	$18.31	$14.00 - $22.50
Q4 2019	5,076	$98	$19.18	$16.71 - $20.89
Q3 2019	39,713	$788	$20.83	$18.66 - $22.85
Q2 2019	4,200	$88	$20.90	$18.60 - $23.06
Q4 2018	3,202	$63	$19.71	$17.71 - $22.74
Q2 2018	19,841	$302	$17.48	$14.40 - $19.94
Q1 2018	168,084	$3,152	$18.80	$16.76 - $20.45
Q4 2017	171,262	$3,295	$18.67	$17.00 - $19.95
Q3 2017	194,797	$3,481	$16.45	$14.53 - $18.67
Q2 2017	328,807	$5,872	$15.86	$13.15 - $17.95
Q1 2017	570,814	$8,277	$15.72	$12.05 - $19.64
Q4 2016	1,502,151	$27,668	$19.45	$16.87 - $21.75
Q3 2016	1,573,986	$29,858	$18.15	$15.62 - $21.53
Q2 2016	818,620	$13,195	$14.11	$11.41 - $16.78
Q1 2016	452,371	$5,428	$11.79	$10.50 - $14.18
Q4 2015	315,555	$4,490	$13.21	$10.57 - $15.84
Q3 2015	29,153	$340	$15.00	$10.61 - $18.30