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
Q2 		– Sell
-61,000
Closed -$1.19M – 11446
2026
Q1 		$1.19M Buy
61,000
+47,800
+362% +$1.17M ﹤0.01% 6132
2025
Q4 		$353K Sell
13,200
-45,100
-77% -$1.16M ﹤0.01% 8464
2025
Q3 		$1.55M Buy
+58,300
New +$1.51M ﹤0.01% 5408
2024
Q4 		– Sell
-17,300
Closed -$840K – 9317
2024
Q3 		$840K Buy
17,300
+12,000
+226% +$527K ﹤0.01% 6222
2024
Q2 		$212K Sell
5,300
-3,400
-39% -$141K ﹤0.01% 8300
2024
Q1 		$382K Buy
+8,700
New +$449K ﹤0.01% 7157
2022
Q4 		– Sell
-8,800
Closed -$247K – 9069
2022
Q3 		$247K Sell
8,800
-5,200
-37% -$170K ﹤0.01% 7858
2022
Q2 		$487K Buy
+14,000
New +$500K ﹤0.01% 6790

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

Jane Street's AMPH Position: Q2 2026 in Review

Jane Street increased its Amphastar Pharmaceuticals (AMPH) stake by 93% in Q2 2026, buying an estimated $1.74M and bringing the position to 178,734 shares worth $3.61M. The position accounts for ﹤0.01% of the portfolio, ranked #4200.

Jane Street first reported a position in AMPH in Q4 2021 and has held it in 19 quarters since. The position peaked at $5.83M in Q4 2025. 211 funds tracked by Wall St. Rank hold AMPH as of Q2 2026.

  • Jane Street held 178,734 shares of Amphastar Pharmaceuticals worth $3.61M as of Q2 2026.
  • Jane Street bought 86,259 Amphastar Pharmaceuticals shares in Q2 2026, an estimated $1.74M.
  • Amphastar Pharmaceuticals made up ﹤0.01% of Jane Street's portfolio in Q2 2026, its #4200 holding.
  • Jane Street first reported a position in Amphastar Pharmaceuticals in Q4 2021 and has held it in 19 quarters since.
  • Jane Street's Amphastar Pharmaceuticals position peaked at $5.83M in Q4 2025.
  • 211 funds tracked by Wall St. Rank held Amphastar Pharmaceuticals as of Q2 2026.

Based on Jane Street's 13F filing for Q2 2026, filed 14 Aug 2026.