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
Q2 		– Sell
-214
Closed -$4.32K – 7518
2026
Q1 		$4.19K Sell
214
-1,527
-88% -$37.4K ﹤0.01% 6782
2025
Q4 		$46.6K Sell
1,741
-330
-16% -$8.5K ﹤0.01% 5656
2025
Q3 		$55.2K Buy
+2,071
New +$53.5K ﹤0.01% 5874
2024
Q3 		– Sell
-814
Closed -$35.7K – 6586
2024
Q2 		$32.6K Buy
+814
New +$33.7K ﹤0.01% 4856
2023
Q3 		– Sell
-394
Closed -$21.5K – 7598
2023
Q2 		$22.6K Buy
394
+294
+294% +$13K ﹤0.01% 5909
2023
Q1 		$3.75K Buy
+100
New +$3.28K ﹤0.01% 6404
2022
Q3 		– Sell
-3,826
Closed -$125K – 7494
2022
Q2 		$133K Buy
3,826
+1,326
+53% +$47.3K ﹤0.01% 4706
2022
Q1 		$90K Buy
+2,500
New +$70.9K ﹤0.01% 5583
2021
Q3 		– Sell
-100
Closed -$2K – 8117
2021
Q2 		$2K Buy
+100
New +$1.88K ﹤0.01% 7917
2017
Q3 		– Sell
-801
Closed -$14K – 4779
2017
Q2 		$14K Sell
801
-800
-50% -$12.7K ﹤0.01% 4074
2017
Q1 		$23K Buy
1,601
+300
+23% +$4.72K ﹤0.01% 3813
2016
Q4 		$24K Buy
+1,301
New +$25.3K ﹤0.01% 3626

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.