BTW
AMPH icon

Boston Trust Walden’s Amphastar Pharmaceuticals AMPH Stock Holding History

Boston Trust Walden’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 		$18.5M Sell
944,789
-142,477
-13% -$3.49M 0.15% 184
2025
Q4 		$29.1M Sell
1,087,266
-85,841
-7% -$2.21M 0.22% 158
2025
Q3 		$31.3M Sell
1,173,107
-3,346
-0.3% -$86.4K 0.23% 152
2025
Q2 		$27M Sell
1,176,453
-39,171
-3% -$972K 0.19% 164
2025
Q1 		$35.2M Buy
1,215,624
+236,704
+24% +$7.56M 0.26% 149
2024
Q4 		$36.3M Buy
978,920
+439,281
+81% +$20.1M 0.26% 150
2024
Q3 		$26.2M Buy
+539,639
New +$23.7M 0.18% 165

Other funds holding AMPH

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return
State Street
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
TD Asset Management Toronto, Ontario, Canada $123B AUM 34.51% 1-Year Est. Return
Fuller & Thaler Asset Management
Fuller & Thaler Asset Management San Mateo, California $29.7B AUM 43.33% 1-Year Est. Return
Marshall Wace
Marshall Wace London, United Kingdom $100B AUM 35.1% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $194B AUM 35% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
EIP
Epoch Investment Partners New York $16.5B AUM 24.3% 1-Year Est. Return

Boston Trust Walden's AMPH Position: Q1 2026 in Review

Boston Trust Walden reduced its Amphastar Pharmaceuticals (AMPH) stake by 13% in Q1 2026, selling an estimated $3.49M and leaving 944,789 shares worth $18.5M. The position accounts for 0.15% of the portfolio, ranked #184.

Boston Trust Walden first reported a position in AMPH in Q3 2024 and has held it in 7 quarters since. The position peaked at $36.3M in Q4 2024. 215 funds tracked by Wall St. Rank hold AMPH as of Q1 2026.

  • Boston Trust Walden held 944,789 shares of Amphastar Pharmaceuticals worth $18.5M as of Q1 2026.
  • Boston Trust Walden sold 142,477 Amphastar Pharmaceuticals shares in Q1 2026, an estimated $3.49M.
  • Amphastar Pharmaceuticals made up 0.15% of Boston Trust Walden's portfolio in Q1 2026, its #184 holding.
  • Boston Trust Walden first reported a position in Amphastar Pharmaceuticals in Q3 2024 and has held it in 7 quarters since.
  • Boston Trust Walden's Amphastar Pharmaceuticals position peaked at $36.3M in Q4 2024.
  • 215 funds tracked by Wall St. Rank held Amphastar Pharmaceuticals as of Q1 2026.

Based on Boston Trust Walden's 13F filing for Q1 2026, filed 24 Apr 2026.