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
2026
Q2 		$222K Sell
11,000
-8,900
-45% -$180K ﹤0.01% 11823
2026
Q1 		$390K Buy
19,900
+7,600
+62% +$186K ﹤0.01% 9871
2025
Q4 		$329K Sell
12,300
-2,800
-19% -$72.1K ﹤0.01% 9941
2025
Q3 		$402K Sell
15,100
-3,200
-17% -$82.6K ﹤0.01% 9655
2025
Q2 		$420K Sell
18,300
-2,500
-12% -$62K ﹤0.01% 9035
2025
Q1 		$603K Buy
20,800
+8,600
+70% +$275K ﹤0.01% 8069
2024
Q4 		$453K Sell
12,200
-12,400
-50% -$567K ﹤0.01% 8780
2024
Q3 		$1.19M Buy
24,600
+17,200
+232% +$755K ﹤0.01% 6506
2024
Q2 		$296K Sell
7,400
-7,500
-50% -$311K ﹤0.01% 9167
2024
Q1 		$654K Buy
14,900
+3,600
+32% +$186K ﹤0.01% 7803
2023
Q4 		$699K Buy
11,300
+2,100
+23% +$110K ﹤0.01% 7402
2023
Q3 		$423K Buy
9,200
+2,300
+33% +$125K ﹤0.01% 8429
2023
Q2 		$397K Buy
6,900
+1,200
+21% +$53.2K ﹤0.01% 8429
2023
Q1 		$214K Sell
5,700
-2,400
-30% -$78.7K ﹤0.01% 10072
2022
Q4 		$227K Sell
8,100
-13,100
-62% -$380K ﹤0.01% 9890
2022
Q3 		$596K Sell
21,200
-12,200
-37% -$398K ﹤0.01% 8075
2022
Q2 		$1.16M Buy
33,400
+19,400
+139% +$692K ﹤0.01% 6684
2022
Q1 		$503K Buy
+14,000
New +$397K ﹤0.01% 9379
2019
Q2 		– Sell
-10,800
Closed -$221K – 9113
2019
Q1 		$221K Buy
+10,800
New +$242K ﹤0.01% 8071
2016
Q1 		– Sell
-300
Closed -$4K – 6681
2015
Q4 		$4K Buy
+300
New +$3.96K ﹤0.01% 8480
2015
Q3 		– Sell
-2,100
Closed -$37K – 8846
2015
Q2 		$37K Buy
+2,100
New +$32.7K ﹤0.01% 7855

Other funds holding AMPH

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
American Century Companies
American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return
Marshall Wace
Marshall Wace London, United Kingdom $127B AUM 46.06% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Fuller & Thaler Asset Management
Fuller & Thaler Asset Management San Mateo, California $36.7B AUM 74.15% 1-Year Est. Return
D.E. Shaw & Co
D.E. Shaw & Co New York $210B AUM 57.28% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

Citadel Advisors's AMPH Position: Q2 2026 in Review

Citadel Advisors reduced its Amphastar Pharmaceuticals (AMPH) stake by 75% in Q2 2026, selling an estimated $995K and leaving 16,231 shares worth $328K. The position accounts for ﹤0.01% of the portfolio, ranked #10928.

Citadel Advisors first reported a position in AMPH in Q3 2014 and has held it in 41 quarters since. The position peaked at $10.5M in Q2 2024. 212 funds tracked by Wall St. Rank hold AMPH as of Q2 2026.

  • Citadel Advisors held 16,231 shares of Amphastar Pharmaceuticals worth $328K as of Q2 2026.
  • Citadel Advisors sold 49,309 Amphastar Pharmaceuticals shares in Q2 2026, an estimated $995K.
  • Amphastar Pharmaceuticals made up ﹤0.01% of Citadel Advisors's portfolio in Q2 2026, its #10928 holding.
  • Citadel Advisors first reported a position in Amphastar Pharmaceuticals in Q3 2014 and has held it in 41 quarters since.
  • Citadel Advisors's Amphastar Pharmaceuticals position peaked at $10.5M in Q2 2024.
  • 212 funds tracked by Wall St. Rank held Amphastar Pharmaceuticals as of Q2 2026.

Based on Citadel Advisors's 13F filing for Q2 2026, filed 14 Aug 2026.