XTX Topco’s Amphastar Pharmaceuticals AMPH Stock Holding History

XTX Topco’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	$1.72M	Buy	87,736 +39,129	+81%	+$957K	0.03%	956
2025 Q4	$1.3M	Buy	+48,607	New	+$1.25M	0.03%	842
2025 Q2	–	Sell	-18,358	Closed	-$532K	–	2315
2025 Q1	$532K	Buy	+18,358	New	+$586K	0.03%	986
2024 Q4	–	Sell	-13,891	Closed	-$674K	–	2254
2024 Q3	$674K	Buy	+13,891	New	+$610K	0.05%	620
2024 Q1	–	Sell	-4,025	Closed	-$249K	–	1799
2023 Q4	$249K	Buy	+4,025	New	+$211K	0.05%	785
2023 Q3	–	Sell	-6,105	Closed	-$351K	–	1532
2023 Q2	$351K	Buy	+6,105	New	+$271K	0.06%	606
2023 Q1	–	Sell	-16,480	Closed	-$462K	–	1247
2022 Q4	$462K	Buy	+16,480	New	+$479K	0.1%	338

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

XTX Topco's AMPH Position: Q1 2026 in Review

XTX Topco increased its Amphastar Pharmaceuticals (AMPH) stake by 81% in Q1 2026, buying an estimated $957K and bringing the position to 87,736 shares worth $1.72M. The position accounts for 0.03% of the portfolio, ranked #956.

XTX Topco first reported a position in AMPH in Q4 2022 and has held it in 7 quarters since. 215 funds tracked by Wall St. Rank hold AMPH as of Q1 2026.

XTX Topco held 87,736 shares of Amphastar Pharmaceuticals worth $1.72M as of Q1 2026.
XTX Topco bought 39,129 Amphastar Pharmaceuticals shares in Q1 2026, an estimated $957K.
Amphastar Pharmaceuticals made up 0.03% of XTX Topco's portfolio in Q1 2026, its #956 holding.
XTX Topco first reported a position in Amphastar Pharmaceuticals in Q4 2022 and has held it in 7 quarters since.
215 funds tracked by Wall St. Rank held Amphastar Pharmaceuticals as of Q1 2026.

Based on XTX Topco's 13F filing for Q1 2026, filed 15 May 2026.