Citadel Advisors
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Citadel Advisors’s Amphastar Pharmaceuticals AMPH Stock Holding History

Citadel Advisors’s Portfolio AMPH Stock Details AMPH Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q4 		– Sell
-11,900
Closed -$317K – 12571
2025
Q3 		$317K Sell
11,900
-400
-3% -$10.3K ﹤0.01% 10228
2025
Q2 		$282K Buy
12,300
+700
+6% +$17.4K ﹤0.01% 9941
2025
Q1 		$336K Buy
11,600
+3,700
+47% +$118K ﹤0.01% 9325
2024
Q4 		$293K Buy
7,900
+4,400
+126% +$201K ﹤0.01% 9699
2024
Q3 		$170K Sell
3,500
-900
-20% -$39.5K ﹤0.01% 10389
2024
Q2 		$176K Sell
4,400
-7,800
-64% -$323K ﹤0.01% 10119
2024
Q1 		$536K Buy
12,200
+3,600
+42% +$186K ﹤0.01% 8242
2023
Q4 		$532K Buy
8,600
+6,400
+291% +$336K ﹤0.01% 7959
2023
Q3 		$101K Sell
2,200
-1,800
-45% -$98.2K ﹤0.01% 10883
2023
Q2 		$230K Buy
4,000
+800
+25% +$35.5K ﹤0.01% 9578
2023
Q1 		$120K Buy
3,200
+1,700
+113% +$55.7K ﹤0.01% 10996
2022
Q4 		$42K Buy
+1,500
New +$43.6K ﹤0.01% 12352
2022
Q3 		– Sell
-12,300
Closed -$428K – 12530
2022
Q2 		$428K Buy
12,300
+3,400
+38% +$121K ﹤0.01% 9000
2022
Q1 		$320K Buy
+8,900
New +$252K ﹤0.01% 10446
2021
Q2 		– Sell
-12,000
Closed -$220K – 13599
2021
Q1 		$220K Buy
+12,000
New +$223K ﹤0.01% 11508
2020
Q3 		– Sell
-16,100
Closed -$362K – 10023
2020
Q2 		$362K Buy
+16,100
New +$295K ﹤0.01% 7608
2016
Q1 		– Sell
-300
Closed -$4K – 6682
2015
Q4 		$4K Buy
+300
New +$3.96K ﹤0.01% 8481
2015
Q3 		– Sell
-1,300
Closed -$23K – 8848
2015
Q2 		$23K Buy
+1,300
New +$20.3K ﹤0.01% 8078

Other funds holding AMPH

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
TD Asset Management
TD Asset Management Toronto, Ontario, Canada $123B AUM 34.51% 1-Year Est. Return
Fuller & Thaler Asset Management
Fuller & Thaler Asset Management San Mateo, California $29.7B AUM 43.33% 1-Year Est. Return
Marshall Wace
Marshall Wace London, United Kingdom $100B AUM 35.1% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $194B AUM 35% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
BTW
Boston Trust Walden Boston, Massachusetts $12.2B AUM 12.45% 1-Year Est. Return

Citadel Advisors's AMPH Position: Q1 2026 in Review

Citadel Advisors reduced its Amphastar Pharmaceuticals (AMPH) stake by 71% in Q1 2026, selling an estimated $3.99M and leaving 65,540 shares worth $1.28M. The position accounts for ﹤0.01% of the portfolio, ranked #7109.

Citadel Advisors first reported a position in AMPH in Q3 2014 and has held it in 40 quarters since. The position peaked at $10.5M in Q2 2024. 215 funds tracked by Wall St. Rank hold AMPH as of Q1 2026.

  • Citadel Advisors held 65,540 shares of Amphastar Pharmaceuticals worth $1.28M as of Q1 2026.
  • Citadel Advisors sold 163,184 Amphastar Pharmaceuticals shares in Q1 2026, an estimated $3.99M.
  • Amphastar Pharmaceuticals made up ﹤0.01% of Citadel Advisors's portfolio in Q1 2026, its #7109 holding.
  • Citadel Advisors first reported a position in Amphastar Pharmaceuticals in Q3 2014 and has held it in 40 quarters since.
  • Citadel Advisors's Amphastar Pharmaceuticals position peaked at $10.5M in Q2 2024.
  • 215 funds tracked by Wall St. Rank held Amphastar Pharmaceuticals as of Q1 2026.

Based on Citadel Advisors's 13F filing for Q1 2026, filed 15 May 2026.