Deerfield Management’s Amphastar Pharmaceuticals AMPH Stock Holding History

Deerfield 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	–	Sell	-14,852	Closed	-$398K	–	89
2025 Q4	$398K	Buy	+14,852	New	+$383K	0.01%	135
2025 Q3	–	Sell	-9,579	Closed	-$220K	–	154
2025 Q2	$220K	Buy	+9,579	New	+$238K	﹤0.01%	103
2024 Q3	–	Sell	-6,623	Closed	-$265K	–	453
2024 Q2	$265K	Buy	+6,623	New	+$274K	﹤0.01%	363
2015 Q3	–	Sell	-448,532	Closed	-$7.88M	–	135
2015 Q2	$7.88M	Hold	448,532	–	–	0.26%	78
2015 Q1	$6.71M	Sell	448,532 -828,045	-65%	-$11.1M	0.22%	77
2014 Q4	$14.8M	Sell	1,276,577 -138,498	-10%	-$1.51M	0.53%	48
2014 Q3	$16.5M	Buy	+1,415,075	New	+$14.7M	0.6%	54

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

Deerfield Management's AMPH Position: Q1 2026 in Review

Deerfield Management sold out of Amphastar Pharmaceuticals (AMPH) in Q1 2026, closing a stake of 14,852 shares — an estimated $398K sold.

Deerfield Management first reported a position in AMPH in Q3 2014 and held it in 7 quarters. The position peaked at $16.5M in Q3 2014. 215 funds tracked by Wall St. Rank hold AMPH as of Q1 2026.

Deerfield Management reported no remaining Amphastar Pharmaceuticals position as of Q1 2026 after selling out during the quarter.
Deerfield Management sold 14,852 Amphastar Pharmaceuticals shares in Q1 2026, an estimated $398K.
Deerfield Management first reported a position in Amphastar Pharmaceuticals in Q3 2014 and held it in 7 quarters.
Deerfield Management's Amphastar Pharmaceuticals position peaked at $16.5M in Q3 2014.
215 funds tracked by Wall St. Rank held Amphastar Pharmaceuticals as of Q1 2026.

Based on Deerfield Management's 13F filing for Q1 2026, filed 15 May 2026.