Robeco Institutional Asset Management
AMPH icon

Robeco Institutional Asset Management’s Amphastar Pharmaceuticals AMPH Stock Holding History

Robeco Institutional Asset 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 		$1.3M Buy
+66,407
New +$1.62M ﹤0.01% 709
2022
Q4 		– Sell
-36,497
Closed -$1.03M – 943
2022
Q3 		$1.03M Hold
36,497
– – ﹤0.01% 698
2022
Q2 		$1.27M Buy
36,497
+2,936
+9% +$105K ﹤0.01% 675
2022
Q1 		$1.21M Buy
+33,561
New +$952K ﹤0.01% 690

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
BTW
Boston Trust Walden Boston, Massachusetts $12.2B AUM 12.45% 1-Year Est. Return

Robeco Institutional Asset Management's AMPH Position: Q1 2026 in Review

Robeco Institutional Asset Management opened a new position in Amphastar Pharmaceuticals (AMPH) in Q1 2026: 66,407 shares worth $1.3M. The stake represents ﹤0.01% of the portfolio and ranks #709 among its holdings. This is a return to the name: Robeco Institutional Asset Management previously reported a position in AMPH as recently as Q3 2022.

Robeco Institutional Asset Management first reported a position in AMPH in Q1 2022 and has held it in 4 quarters since. 215 funds tracked by Wall St. Rank hold AMPH as of Q1 2026.

  • Robeco Institutional Asset Management held 66,407 shares of Amphastar Pharmaceuticals worth $1.3M as of Q1 2026.
  • Amphastar Pharmaceuticals was a new Robeco Institutional Asset Management position in Q1 2026.
  • Amphastar Pharmaceuticals made up ﹤0.01% of Robeco Institutional Asset Management's portfolio in Q1 2026, its #709 holding.
  • Robeco Institutional Asset Management first reported a position in Amphastar Pharmaceuticals in Q1 2022 and has held it in 4 quarters since.
  • 215 funds tracked by Wall St. Rank held Amphastar Pharmaceuticals as of Q1 2026.

Based on Robeco Institutional Asset Management's 13F filing for Q1 2026, filed 21 Apr 2026.