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 Q2	$945K	Sell	46,808 -40,928	-47%	-$826K	0.01%	1842
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 $6.73T AUM 46.02% 1-Year Est. Return

Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return

Marshall Wace London, United Kingdom $127B AUM 46.06% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Fuller & Thaler Asset Management San Mateo, California $36.7B AUM 74.15% 1-Year Est. Return

D.E. Shaw & Co New York $210B AUM 57.28% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

XTX Topco's AMPH Position: Q2 2026 in Review

XTX Topco reduced its Amphastar Pharmaceuticals (AMPH) stake by 47% in Q2 2026, selling an estimated $826K and leaving 46,808 shares worth $945K. The position accounts for 0.01% of the portfolio, ranked #1842.

XTX Topco first reported a position in AMPH in Q4 2022 and has held it in 8 quarters since. The position peaked at $1.72M in Q1 2026. 211 funds tracked by Wall St. Rank hold AMPH as of Q2 2026.

XTX Topco held 46,808 shares of Amphastar Pharmaceuticals worth $945K as of Q2 2026.
XTX Topco sold 40,928 Amphastar Pharmaceuticals shares in Q2 2026, an estimated $826K.
Amphastar Pharmaceuticals made up 0.01% of XTX Topco's portfolio in Q2 2026, its #1842 holding.
XTX Topco first reported a position in Amphastar Pharmaceuticals in Q4 2022 and has held it in 8 quarters since.
XTX Topco's Amphastar Pharmaceuticals position peaked at $1.72M in Q1 2026.
211 funds tracked by Wall St. Rank held Amphastar Pharmaceuticals as of Q2 2026.

Based on XTX Topco's 13F filing for Q2 2026, filed 14 Aug 2026.