Wellington Management Group
AMPH icon

Wellington Management Group’s Amphastar Pharmaceuticals AMPH Stock Holding History

Wellington Management Group’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
2025
Q4 		– Sell
-17,199
Closed -$458K – 1922
2025
Q3 		$458K Buy
17,199
+1,581
+10% +$40.8K ﹤0.01% 1891
2025
Q2 		$359K Sell
15,618
-1,295
-8% -$32.1K ﹤0.01% 1859
2025
Q1 		$490K Sell
16,913
-871
-5% -$27.8K ﹤0.01% 1826
2024
Q4 		$660K Sell
17,784
-1,939
-10% -$88.7K ﹤0.01% 1792
2024
Q3 		$957K Buy
+19,723
New +$866K ﹤0.01% 1719
2022
Q3 		– Sell
-15,900
Closed -$553K – 2023
2022
Q2 		$553K Buy
+15,900
New +$567K ﹤0.01% 1809
2017
Q2 		– Sell
-19,416
Closed -$282K – 2194
2017
Q1 		$282K Sell
19,416
-25,770
-57% -$405K ﹤0.01% 2163
2016
Q4 		$832K Buy
45,186
+15,386
+52% +$299K ﹤0.01% 1906
2016
Q3 		$566K Buy
+29,800
New +$541K ﹤0.01% 1962

Other funds holding AMPH

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
TD Asset Management
TD Asset Management Toronto, Ontario, Canada $115B AUM 41.58% 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
Fuller & Thaler Asset Management
Fuller & Thaler Asset Management San Mateo, California $36.7B AUM 74.15% 1-Year Est. Return
Marshall Wace
Marshall Wace London, United Kingdom $127B AUM 46.06% 1-Year Est. Return
EIP
Epoch Investment Partners New York $17.6B AUM 34.17% 1-Year Est. Return
BTW
Boston Trust Walden Boston, Massachusetts $13.1B AUM 24.63% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Wellington Management Group's AMPH Position: Q4 2025 in Review

Wellington Management Group sold out of Amphastar Pharmaceuticals (AMPH) in Q4 2025, closing a stake of 17,199 shares — an estimated $458K sold.

Wellington Management Group first reported a position in AMPH in Q3 2016 and held it in 9 quarters. The position peaked at $957K in Q3 2024. 235 funds tracked by Wall St. Rank hold AMPH as of Q4 2025.

  • Wellington Management Group reported no remaining Amphastar Pharmaceuticals position as of Q4 2025 after selling out during the quarter.
  • Wellington Management Group sold 17,199 Amphastar Pharmaceuticals shares in Q4 2025, an estimated $458K.
  • Wellington Management Group first reported a position in Amphastar Pharmaceuticals in Q3 2016 and held it in 9 quarters.
  • Wellington Management Group's Amphastar Pharmaceuticals position peaked at $957K in Q3 2024.
  • 235 funds tracked by Wall St. Rank held Amphastar Pharmaceuticals as of Q4 2025.

Based on Wellington Management Group's 13F filing for Q4 2025, filed 17 Feb 2026.