Legato Capital Management’s Amphastar Pharmaceuticals AMPH Stock Holding History

Legato Capital Management’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	$669K	Buy	34,135 +7,545	+28%	+$185K	0.06%	430
2025 Q4	$712K	Sell	26,590 -9,470	-26%	-$244K	0.06%	448
2025 Q3	$961K	Hold	36,060	–	–	0.1%	301
2025 Q2	$828K	Buy	36,060 +6,361	+21%	+$158K	0.1%	321
2025 Q1	$861K	Buy	29,699 +11,238	+61%	+$359K	0.12%	290
2024 Q4	$685K	Hold	18,461	–	–	0.09%	388
2024 Q3	$896K	Buy	18,461 +3,651	+25%	+$160K	0.11%	327
2024 Q2	$592K	Buy	14,810 +4,303	+41%	+$178K	0.08%	394
2024 Q1	$461K	Sell	10,507 -4,710	-31%	-$243K	0.06%	454
2023 Q4	$941K	Buy	15,217 +7,431	+95%	+$390K	0.12%	283
2023 Q3	$358K	Sell	7,786 -305	-4%	-$16.6K	0.05%	465
2023 Q2	$465K	Buy	+8,091	New	+$359K	0.06%	437

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

Legato Capital Management's AMPH Position: Q1 2026 in Review

Legato Capital Management increased its Amphastar Pharmaceuticals (AMPH) stake by 28% in Q1 2026, buying an estimated $185K and bringing the position to 34,135 shares worth $669K. The position accounts for 0.06% of the portfolio, ranked #430.

Legato Capital Management first reported a position in AMPH in Q2 2023 and has held it in 12 quarters since. The position peaked at $961K in Q3 2025. 215 funds tracked by Wall St. Rank hold AMPH as of Q1 2026.

Legato Capital Management held 34,135 shares of Amphastar Pharmaceuticals worth $669K as of Q1 2026.
Legato Capital Management bought 7,545 Amphastar Pharmaceuticals shares in Q1 2026, an estimated $185K.
Amphastar Pharmaceuticals made up 0.06% of Legato Capital Management's portfolio in Q1 2026, its #430 holding.
Legato Capital Management first reported a position in Amphastar Pharmaceuticals in Q2 2023 and has held it in 12 quarters since.
Legato Capital Management's Amphastar Pharmaceuticals position peaked at $961K in Q3 2025.
215 funds tracked by Wall St. Rank held Amphastar Pharmaceuticals as of Q1 2026.

Based on Legato Capital Management's 13F filing for Q1 2026, filed 14 May 2026.