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 New York $5.72T AUM 30.48% 1-Year Est. Return

Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return

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 Toronto, Ontario, Canada $123B AUM 34.51% 1-Year Est. Return

Fuller & Thaler Asset Management San Mateo, California $29.7B AUM 43.33% 1-Year Est. Return

Marshall Wace London, United Kingdom $100B AUM 35.1% 1-Year Est. Return

American Century Companies Kansas City, Missouri $194B AUM 35% 1-Year Est. Return

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.