Group One Trading
AMPH icon

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 		$11.8K Sell
600
-1,500
-71% -$36.7K ﹤0.01% 6287
2025
Q4 		$56.2K Buy
2,100
+400
+24% +$10.3K ﹤0.01% 5502
2025
Q3 		$45.3K Buy
1,700
+700
+70% +$18.1K ﹤0.01% 6043
2025
Q2 		$23K Buy
+1,000
New +$24.8K ﹤0.01% 6172
2025
Q1 		– Sell
-100
Closed -$3.71K – 7527
2024
Q4 		$3.71K Sell
100
-4,300
-98% -$197K ﹤0.01% 6539
2024
Q3 		$214K Buy
4,400
+3,700
+529% +$162K ﹤0.01% 3559
2024
Q2 		$28K Sell
700
-2,300
-77% -$95.3K ﹤0.01% 4974
2024
Q1 		$132K Buy
+3,000
New +$155K ﹤0.01% 3896
2023
Q4 		– Sell
-1,800
Closed -$82.8K – 7323
2023
Q3 		$82.8K Buy
1,800
+1,300
+260% +$70.9K ﹤0.01% 4626
2023
Q2 		$28.7K Buy
+500
New +$22.2K ﹤0.01% 5711
2023
Q1 		– Sell
-300
Closed -$8.41K – 7143
2022
Q4 		$8.41K Sell
300
-200
-40% -$5.81K ﹤0.01% 6094
2022
Q3 		$14K Sell
500
-2,100
-81% -$68.6K ﹤0.01% 6278
2022
Q2 		$90K Buy
2,600
+1,900
+271% +$67.8K ﹤0.01% 5075
2022
Q1 		$25K Buy
+700
New +$19.9K ﹤0.01% 6599
2016
Q4 		– Sell
-5,300
Closed -$101K – 4394
2016
Q3 		$101K Buy
5,300
+2,800
+112% +$50.8K ﹤0.01% 2916
2016
Q2 		$40K Buy
+2,500
New +$35.3K ﹤0.01% 3434

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

Group One Trading's AMPH Position: Q1 2026 in Review

Group One Trading reduced its Amphastar Pharmaceuticals (AMPH) stake by 88% in Q1 2026, selling an estimated $37.4K and leaving 214 shares worth $4.19K. The position accounts for ﹤0.01% of the portfolio, ranked #6782.

Group One Trading first reported a position in AMPH in Q4 2016 and has held it in 12 quarters since. The position peaked at $133K in Q2 2022. 215 funds tracked by Wall St. Rank hold AMPH as of Q1 2026.

  • Group One Trading held 214 shares of Amphastar Pharmaceuticals worth $4.19K as of Q1 2026.
  • Group One Trading sold 1,527 Amphastar Pharmaceuticals shares in Q1 2026, an estimated $37.4K.
  • Amphastar Pharmaceuticals made up ﹤0.01% of Group One Trading's portfolio in Q1 2026, its #6782 holding.
  • Group One Trading first reported a position in Amphastar Pharmaceuticals in Q4 2016 and has held it in 12 quarters since.
  • Group One Trading's Amphastar Pharmaceuticals position peaked at $133K in Q2 2022.
  • 215 funds tracked by Wall St. Rank held Amphastar Pharmaceuticals as of Q1 2026.

Based on Group One Trading's 13F filing for Q1 2026, filed 13 May 2026.