Group One Trading
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Group One Trading’s Amphastar Pharmaceuticals AMPH Stock Holding History

Group One Trading’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 		– Sell
-600
Closed -$16.1K – 7553
2025
Q4 		$16.1K Sell
600
-600
-50% -$15.5K ﹤0.01% 6516
2025
Q3 		$32K Sell
1,200
-300
-20% -$7.75K ﹤0.01% 6314
2025
Q2 		$34.4K Buy
+1,500
New +$37.2K ﹤0.01% 5862
2024
Q4 		– Sell
-300
Closed -$14.6K – 7209
2024
Q3 		$14.6K Sell
300
-600
-67% -$26.3K ﹤0.01% 5407
2024
Q2 		$36K Sell
900
-600
-40% -$24.9K ﹤0.01% 4774
2024
Q1 		$65.9K Buy
+1,500
New +$77.5K ﹤0.01% 4482
2023
Q4 		– Sell
-500
Closed -$23K – 7324
2023
Q3 		$23K Buy
+500
New +$27.3K ﹤0.01% 5782
2015
Q4 		– Sell
-800
Closed -$9K – 4702
2015
Q3 		$9K Buy
+800
New +$12K ﹤0.01% 4327

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

Group One Trading's AMPH Position: Q2 2026 in Review

Group One Trading sold out of Amphastar Pharmaceuticals (AMPH) in Q2 2026, closing a stake of 214 shares — an estimated $4.32K sold.

Group One Trading first reported a position in AMPH in Q4 2016 and held it in 12 quarters. The position peaked at $133K in Q2 2022. 211 funds tracked by Wall St. Rank hold AMPH as of Q2 2026.

  • Group One Trading reported no remaining Amphastar Pharmaceuticals position as of Q2 2026 after selling out during the quarter.
  • Group One Trading sold 214 Amphastar Pharmaceuticals shares in Q2 2026, an estimated $4.32K.
  • Group One Trading first reported a position in Amphastar Pharmaceuticals in Q4 2016 and held it in 12 quarters.
  • Group One Trading's Amphastar Pharmaceuticals position peaked at $133K in Q2 2022.
  • 211 funds tracked by Wall St. Rank held Amphastar Pharmaceuticals as of Q2 2026.

Based on Group One Trading's 13F filing for Q2 2026, filed 14 Aug 2026.