AMPHASTAR PHARMACEUTICALS IN

Ticker: AMPH CUSIP: 03209R103 Class: Common Stock

NORTHERN TRUST CORP's Holding History (CIK: 0000073124)

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

Q4 2025

Shares 371,391 Value ($000) $9,946 Avg Close $25.76 Range $22.94 - $29.00

Q3 2025

Shares 399,470 Value ($000) $10,646 Avg Close $25.82 Range $20.39 - $31.26

Q2 2025

Shares 421,136 Value ($000) $9,669 Avg Close $24.82 Range $22.64 - $29.27

Q1 2025

Shares 594,437 Value ($000) $17,233 Avg Close $31.94 Range $25.89 - $39.01

Q4 2024

Shares 613,170 Value ($000) $22,767 Avg Close $45.73 Range $36.48 - $53.96

Q3 2024

Shares 583,362 Value ($000) $28,311 Avg Close $43.89 Range $36.56 - $50.62

Q2 2024

Shares 564,123 Value ($000) $22,565 Avg Close $41.44 Range $38.43 - $46.62

Q1 2024

Shares 560,782 Value ($000) $24,624 Avg Close $51.65 Range $42.16 - $65.92

Q4 2023

Shares 575,417 Value ($000) $35,590 Avg Close $52.53 Range $43.79 - $63.67

Q3 2023

Shares 559,423 Value ($000) $25,728 Avg Close $54.55 Range $44.86 - $67.66

Q2 2023

Shares 635,443 Value ($000) $36,519 Avg Close $44.33 Range $35.62 - $58.70

Q1 2023

Shares 649,228 Value ($000) $24,346 Avg Close $32.78 Range $27.58 - $38.22

Q4 2022

Shares 437,947 Value ($000) $12,271 Avg Close $29.04 Range $26.76 - $31.64

Q3 2022

Shares 415,117 Value ($000) $11,666 Avg Close $32.65 Range $27.10 - $39.07

Q2 2022

Shares 415,143 Value ($000) $14,442 Avg Close $35.69 Range $28.64 - $44.46

Q1 2022

Shares 404,142 Value ($000) $14,509 Avg Close $28.36 Range $22.07 - $37.16

Q4 2021

Shares 421,951 Value ($000) $9,828 Avg Close $20.45 Range $18.12 - $23.85

Q3 2021

Shares 423,385 Value ($000) $8,048 Avg Close $19.59 Range $17.56 - $21.63

Q2 2021

Shares 433,603 Value ($000) $8,742 Avg Close $18.84 Range $16.91 - $20.94

Q1 2021

Shares 460,410 Value ($000) $8,435 Avg Close $18.59 Range $17.11 - $20.93

Q4 2020

Shares 489,320 Value ($000) $9,841 Avg Close $19.46 Range $17.51 - $21.38

Q3 2020

Shares 510,977 Value ($000) $9,580 Avg Close $20.14 Range $17.83 - $22.69

Q2 2020

Shares 521,635 Value ($000) $11,717 Avg Close $18.31 Range $14.00 - $22.50

Q1 2020

Shares 500,479 Value ($000) $7,428 Avg Close $17.40 Range $12.33 - $20.40

Q4 2019

Shares 495,667 Value ($000) $9,562 Avg Close $19.18 Range $16.71 - $20.89

Q3 2019

Shares 532,702 Value ($000) $10,564 Avg Close $20.83 Range $18.66 - $22.85

Q2 2019

Shares 480,049 Value ($000) $10,133 Avg Close $20.90 Range $18.60 - $23.06

Q1 2019

Shares 473,789 Value ($000) $9,679 Avg Close $22.40 Range $19.32 - $25.43

Q4 2018

Shares 473,437 Value ($000) $9,422 Avg Close $19.71 Range $17.71 - $22.74

Q3 2018

Shares 480,430 Value ($000) $9,243 Avg Close $17.82 Range $15.04 - $19.50

Q2 2018

Shares 454,100 Value ($000) $6,930 Avg Close $17.48 Range $14.40 - $19.94

Q1 2018

Shares 467,355 Value ($000) $8,763 Avg Close $18.80 Range $16.76 - $20.45

Q4 2017

Shares 469,432 Value ($000) $9,032 Avg Close $18.67 Range $17.00 - $19.95

Q3 2017

Shares 479,618 Value ($000) $8,570 Avg Close $16.45 Range $14.53 - $18.67

Q2 2017

Shares 485,706 Value ($000) $8,675 Avg Close $15.86 Range $13.15 - $17.95

Q1 2017

Shares 476,034 Value ($000) $6,903 Avg Close $15.72 Range $12.05 - $19.64

Q4 2016

Shares 449,463 Value ($000) $8,279 Avg Close $19.45 Range $16.87 - $21.75

Q3 2016

Shares 439,397 Value ($000) $8,336 Avg Close $18.15 Range $15.62 - $21.53

Q2 2016

Shares 440,796 Value ($000) $7,106 Avg Close $14.11 Range $11.41 - $16.78

Q1 2016

Shares 385,647 Value ($000) $4,627 Avg Close $11.79 Range $10.50 - $14.18

Q4 2015

Shares 376,997 Value ($000) $5,365 Avg Close $13.21 Range $10.57 - $15.84

Q3 2015

Shares 338,495 Value ($000) $3,957 Avg Close $15.00 Range $10.61 - $18.30

Q2 2015

Shares 121,749 Value ($000) $2,141 Avg Close $15.59 Range $13.55 - $18.25

Q1 2015

Shares 94,227 Value ($000) $1,410 Avg Close $13.37 Range $11.12 - $15.79

Q4 2014

Shares 94,728 Value ($000) $1,100 Avg Close $10.89 Range $9.76 - $12.46

Q3 2014

Shares 22,208 Value ($000) $259 Avg Close $10.42 Range $8.32 - $12.52

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	371,391	$9,946	$25.76	$22.94 - $29.00
Q3 2025	399,470	$10,646	$25.82	$20.39 - $31.26
Q2 2025	421,136	$9,669	$24.82	$22.64 - $29.27
Q1 2025	594,437	$17,233	$31.94	$25.89 - $39.01
Q4 2024	613,170	$22,767	$45.73	$36.48 - $53.96
Q3 2024	583,362	$28,311	$43.89	$36.56 - $50.62
Q2 2024	564,123	$22,565	$41.44	$38.43 - $46.62
Q1 2024	560,782	$24,624	$51.65	$42.16 - $65.92
Q4 2023	575,417	$35,590	$52.53	$43.79 - $63.67
Q3 2023	559,423	$25,728	$54.55	$44.86 - $67.66
Q2 2023	635,443	$36,519	$44.33	$35.62 - $58.70
Q1 2023	649,228	$24,346	$32.78	$27.58 - $38.22
Q4 2022	437,947	$12,271	$29.04	$26.76 - $31.64
Q3 2022	415,117	$11,666	$32.65	$27.10 - $39.07
Q2 2022	415,143	$14,442	$35.69	$28.64 - $44.46
Q1 2022	404,142	$14,509	$28.36	$22.07 - $37.16
Q4 2021	421,951	$9,828	$20.45	$18.12 - $23.85
Q3 2021	423,385	$8,048	$19.59	$17.56 - $21.63
Q2 2021	433,603	$8,742	$18.84	$16.91 - $20.94
Q1 2021	460,410	$8,435	$18.59	$17.11 - $20.93
Q4 2020	489,320	$9,841	$19.46	$17.51 - $21.38
Q3 2020	510,977	$9,580	$20.14	$17.83 - $22.69
Q2 2020	521,635	$11,717	$18.31	$14.00 - $22.50
Q1 2020	500,479	$7,428	$17.40	$12.33 - $20.40
Q4 2019	495,667	$9,562	$19.18	$16.71 - $20.89
Q3 2019	532,702	$10,564	$20.83	$18.66 - $22.85
Q2 2019	480,049	$10,133	$20.90	$18.60 - $23.06
Q1 2019	473,789	$9,679	$22.40	$19.32 - $25.43
Q4 2018	473,437	$9,422	$19.71	$17.71 - $22.74
Q3 2018	480,430	$9,243	$17.82	$15.04 - $19.50
Q2 2018	454,100	$6,930	$17.48	$14.40 - $19.94
Q1 2018	467,355	$8,763	$18.80	$16.76 - $20.45
Q4 2017	469,432	$9,032	$18.67	$17.00 - $19.95
Q3 2017	479,618	$8,570	$16.45	$14.53 - $18.67
Q2 2017	485,706	$8,675	$15.86	$13.15 - $17.95
Q1 2017	476,034	$6,903	$15.72	$12.05 - $19.64
Q4 2016	449,463	$8,279	$19.45	$16.87 - $21.75
Q3 2016	439,397	$8,336	$18.15	$15.62 - $21.53
Q2 2016	440,796	$7,106	$14.11	$11.41 - $16.78
Q1 2016	385,647	$4,627	$11.79	$10.50 - $14.18
Q4 2015	376,997	$5,365	$13.21	$10.57 - $15.84
Q3 2015	338,495	$3,957	$15.00	$10.61 - $18.30
Q2 2015	121,749	$2,141	$15.59	$13.55 - $18.25
Q1 2015	94,227	$1,410	$13.37	$11.12 - $15.79
Q4 2014	94,728	$1,100	$10.89	$9.76 - $12.46
Q3 2014	22,208	$259	$10.42	$8.32 - $12.52