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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
Q2 		$513K Hold
25,405
– – 0.03% 310
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 $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
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

Advisor OS's AMPH Position: Q2 2026 in Review

Advisor OS held its Amphastar Pharmaceuticals (AMPH) position steady in Q2 2026 at 25,405 shares worth $513K. The position accounts for 0.03% of the portfolio, ranked #310.

Advisor OS first reported a position in AMPH in Q1 2024 and has held it in 10 quarters since. The position peaked at $1.26M in Q3 2024. 212 funds tracked by Wall St. Rank hold AMPH as of Q2 2026.

  • Advisor OS held 25,405 shares of Amphastar Pharmaceuticals worth $513K as of Q2 2026.
  • Advisor OS left its Amphastar Pharmaceuticals share count unchanged in Q2 2026.
  • Amphastar Pharmaceuticals made up 0.03% of Advisor OS's portfolio in Q2 2026, its #310 holding.
  • Advisor OS first reported a position in Amphastar Pharmaceuticals in Q1 2024 and has held it in 10 quarters since.
  • Advisor OS's Amphastar Pharmaceuticals position peaked at $1.26M in Q3 2024.
  • 212 funds tracked by Wall St. Rank held Amphastar Pharmaceuticals as of Q2 2026.

Based on Advisor OS's 13F filing for Q2 2026, filed 5 Aug 2026.