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Advisor OS’s Amphastar Pharmaceuticals AMPH Stock Holding History

Advisor OS’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 		$498K Hold
25,405
– – 0.04% 298
2025
Q4 		$680K Hold
25,405
– – 0.05% 231
2025
Q3 		$677K Hold
25,405
– – 0.06% 209
2025
Q2 		$583K Hold
25,405
– – 0.06% 224
2025
Q1 		$736K Hold
25,405
– – 0.08% 168
2024
Q4 		$943K Sell
25,405
-628
-2% -$28.7K 0.11% 130
2024
Q3 		$1.26M Buy
26,033
+21
+0.1% +$922 0.13% 127
2024
Q2 		$1.04M Sell
26,012
-927
-3% -$38.4K 0.11% 159
2024
Q1 		$1.18M Buy
+26,939
New +$1.39M 0.14% 138

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

Advisor OS's AMPH Position: Q1 2026 in Review

Advisor OS held its Amphastar Pharmaceuticals (AMPH) position steady in Q1 2026 at 25,405 shares worth $498K. The position accounts for 0.04% of the portfolio, ranked #298.

Advisor OS first reported a position in AMPH in Q1 2024 and has held it in 9 quarters since. The position peaked at $1.26M in Q3 2024. 215 funds tracked by Wall St. Rank hold AMPH as of Q1 2026.

  • Advisor OS held 25,405 shares of Amphastar Pharmaceuticals worth $498K as of Q1 2026.
  • Advisor OS left its Amphastar Pharmaceuticals share count unchanged in Q1 2026.
  • Amphastar Pharmaceuticals made up 0.04% of Advisor OS's portfolio in Q1 2026, its #298 holding.
  • Advisor OS first reported a position in Amphastar Pharmaceuticals in Q1 2024 and has held it in 9 quarters since.
  • Advisor OS's Amphastar Pharmaceuticals position peaked at $1.26M in Q3 2024.
  • 215 funds tracked by Wall St. Rank held Amphastar Pharmaceuticals as of Q1 2026.

Based on Advisor OS's 13F filing for Q1 2026, filed 8 May 2026.