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
Q3 		$20.7M Sell
803,869
-5,699
-0.7% -$123K ﹤0.01% 1943
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 $6.79T AUM 37.06% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $551B AUM 33.95% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.44T AUM 36.12% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $229B AUM 33.35% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.76T AUM
Marshall Wace
Marshall Wace London, United Kingdom $114B AUM 35.47% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.92T AUM 36.1% 1-Year Est. Return
Fuller & Thaler Asset Management
Fuller & Thaler Asset Management San Mateo, California $33.9B AUM 47.7% 1-Year Est. Return
LSV Asset Management
LSV Asset Management Chicago, Illinois $54.1B AUM 39.29% 1-Year Est. Return
Renaissance Technologies
Renaissance Technologies New York $73.4B AUM 32.8% 1-Year Est. Return

Vanguard Portfolio Management's AMPH Position: Q3 2026 in Review

Vanguard Portfolio Management reduced its Amphastar Pharmaceuticals (AMPH) stake by 0.7% in Q3 2026, selling an estimated $123K and leaving 803,869 shares worth $20.7M. The position accounts for ﹤0.01% of the portfolio, ranked #1943.

Vanguard Portfolio Management first reported a position in AMPH in Q1 2026 and has held it in 3 quarters since. 175 funds tracked by Wall St. Rank hold AMPH as of Q3 2026.

  • Vanguard Portfolio Management held 803,869 shares of Amphastar Pharmaceuticals worth $20.7M as of Q3 2026.
  • Vanguard Portfolio Management sold 5,699 Amphastar Pharmaceuticals shares in Q3 2026, an estimated $123K.
  • Amphastar Pharmaceuticals made up ﹤0.01% of Vanguard Portfolio Management's portfolio in Q3 2026, its #1943 holding.
  • Vanguard Portfolio Management first reported a position in Amphastar Pharmaceuticals in Q1 2026 and has held it in 3 quarters since.
  • 175 funds tracked by Wall St. Rank held Amphastar Pharmaceuticals as of Q3 2026.

Based on Vanguard Portfolio Management's 13F filing for Q3 2026, filed 13 Nov 2026.