Jane Street
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Jane Street’s Amphastar Pharmaceuticals AMPH Stock Holding History

Jane Street’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
Q1 		$1.81M Sell
92,475
-125,062
-57% -$3.06M ﹤0.01% 5289
2025
Q4 		$5.83M Buy
217,537
+69,078
+47% +$1.78M ﹤0.01% 3005
2025
Q3 		$3.96M Sell
148,459
-11,623
-7% -$300K ﹤0.01% 3771
2025
Q2 		$3.68M Buy
160,082
+113,417
+243% +$2.81M ﹤0.01% 3438
2025
Q1 		$1.35M Sell
46,665
-52,822
-53% -$1.69M ﹤0.01% 5020
2024
Q4 		$3.69M Buy
99,487
+35,873
+56% +$1.64M ﹤0.01% 3102
2024
Q3 		$3.09M Sell
63,614
-33,100
-34% -$1.45M ﹤0.01% 3673
2024
Q2 		$3.87M Buy
96,714
+57,854
+149% +$2.4M ﹤0.01% 3373
2024
Q1 		$1.71M Sell
38,860
-13,119
-25% -$678K ﹤0.01% 4414
2023
Q4 		$3.21M Buy
51,979
+11,868
+30% +$623K ﹤0.01% 3534
2023
Q3 		$1.84M Buy
40,111
+23,297
+139% +$1.27M ﹤0.01% 4189
2023
Q2 		$966K Sell
16,814
-11,529
-41% -$511K ﹤0.01% 5246
2023
Q1 		$1.06M Buy
28,343
+20,094
+244% +$659K ﹤0.01% 4884
2022
Q4 		$231K Sell
8,249
-29,046
-78% -$843K ﹤0.01% 7445
2022
Q3 		$1.05M Buy
37,295
+19,710
+112% +$644K ﹤0.01% 5331
2022
Q2 		$612K Buy
17,585
+8,309
+90% +$297K ﹤0.01% 6375
2022
Q1 		$333K Sell
9,276
-10,090
-52% -$286K ﹤0.01% 8235
2021
Q4 		$451K Buy
+19,366
New +$396K ﹤0.01% 7454

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

Jane Street's AMPH Position: Q1 2026 in Review

Jane Street reduced its Amphastar Pharmaceuticals (AMPH) stake by 57% in Q1 2026, selling an estimated $3.06M and leaving 92,475 shares worth $1.81M. The position accounts for ﹤0.01% of the portfolio, ranked #5289.

Jane Street first reported a position in AMPH in Q4 2021 and has held it in 18 quarters since. The position peaked at $5.83M in Q4 2025. 215 funds tracked by Wall St. Rank hold AMPH as of Q1 2026.

  • Jane Street held 92,475 shares of Amphastar Pharmaceuticals worth $1.81M as of Q1 2026.
  • Jane Street sold 125,062 Amphastar Pharmaceuticals shares in Q1 2026, an estimated $3.06M.
  • Amphastar Pharmaceuticals made up ﹤0.01% of Jane Street's portfolio in Q1 2026, its #5289 holding.
  • Jane Street first reported a position in Amphastar Pharmaceuticals in Q4 2021 and has held it in 18 quarters since.
  • Jane Street's Amphastar Pharmaceuticals position peaked at $5.83M in Q4 2025.
  • 215 funds tracked by Wall St. Rank held Amphastar Pharmaceuticals as of Q1 2026.

Based on Jane Street's 13F filing for Q1 2026, filed 12 May 2026.