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
Q2 		$1.34M Hold
66,407
– – ﹤0.01% 697
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 $6.73T AUM 46.02% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.38T AUM 44.17% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
American Century Companies
American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return
Marshall Wace
Marshall Wace London, United Kingdom $127B AUM 46.06% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Fuller & Thaler Asset Management
Fuller & Thaler Asset Management San Mateo, California $36.7B AUM 74.15% 1-Year Est. Return
D.E. Shaw & Co
D.E. Shaw & Co New York $210B AUM 57.28% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

Robeco Institutional Asset Management's AMPH Position: Q2 2026 in Review

Robeco Institutional Asset Management held its Amphastar Pharmaceuticals (AMPH) position steady in Q2 2026 at 66,407 shares worth $1.34M. The position accounts for ﹤0.01% of the portfolio, ranked #697.

Robeco Institutional Asset Management first reported a position in AMPH in Q1 2022 and has held it in 5 quarters since. 211 funds tracked by Wall St. Rank hold AMPH as of Q2 2026.

  • Robeco Institutional Asset Management held 66,407 shares of Amphastar Pharmaceuticals worth $1.34M as of Q2 2026.
  • Robeco Institutional Asset Management left its Amphastar Pharmaceuticals share count unchanged in Q2 2026.
  • Amphastar Pharmaceuticals made up ﹤0.01% of Robeco Institutional Asset Management's portfolio in Q2 2026, its #697 holding.
  • Robeco Institutional Asset Management first reported a position in Amphastar Pharmaceuticals in Q1 2022 and has held it in 5 quarters since.
  • 211 funds tracked by Wall St. Rank held Amphastar Pharmaceuticals as of Q2 2026.

Based on Robeco Institutional Asset Management's 13F filing for Q2 2026, filed 21 Jul 2026.