Vanguard Portfolio Management
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Vanguard Portfolio Management’s Amphastar Pharmaceuticals AMPH Stock Holding History

Vanguard Portfolio 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 		$16.3M Buy
809,568
+21,752
+3% +$439K ﹤0.01% 2045
2026
Q1 		$15.4M Buy
+787,816
New +$19.3M ﹤0.01% 1986

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 $3.37T AUM 44.26% 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
LSV Asset Management
LSV Asset Management Chicago, Illinois $55.1B AUM 45.38% 1-Year Est. Return

Vanguard Portfolio Management's AMPH Position: Q2 2026 in Review

Vanguard Portfolio Management increased its Amphastar Pharmaceuticals (AMPH) stake by 2.8% in Q2 2026, buying an estimated $439K and bringing the position to 809,568 shares worth $16.3M. The position accounts for ﹤0.01% of the portfolio, ranked #2045.

Vanguard Portfolio Management first reported a position in AMPH in Q1 2026 and has held it in 2 quarters since. 201 funds tracked by Wall St. Rank hold AMPH as of Q2 2026.

  • Vanguard Portfolio Management held 809,568 shares of Amphastar Pharmaceuticals worth $16.3M as of Q2 2026.
  • Vanguard Portfolio Management bought 21,752 Amphastar Pharmaceuticals shares in Q2 2026, an estimated $439K.
  • Amphastar Pharmaceuticals made up ﹤0.01% of Vanguard Portfolio Management's portfolio in Q2 2026, its #2045 holding.
  • Vanguard Portfolio Management first reported a position in Amphastar Pharmaceuticals in Q1 2026 and has held it in 2 quarters since.
  • 201 funds tracked by Wall St. Rank held Amphastar Pharmaceuticals as of Q2 2026.

Based on Vanguard Portfolio Management's 13F filing for Q2 2026, filed 13 Aug 2026.