Tudor Investment Corp
AMPH icon

Tudor Investment Corp’s Amphastar Pharmaceuticals AMPH Stock Holding History

Tudor Investment Corp’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
Q3 		– Sell
-12,916
Closed -$297K – 3322
2025
Q2 		$297K Sell
12,916
-8,877
-41% -$220K ﹤0.01% 2893
2025
Q1 		$632K Buy
+21,793
New +$696K ﹤0.01% 2130
2024
Q4 		– Sell
-6,115
Closed -$297K – 2976
2024
Q3 		$297K Sell
6,115
-13,312
-69% -$584K ﹤0.01% 2330
2024
Q2 		$777K Buy
+19,427
New +$805K ﹤0.01% 1593
2024
Q1 		– Sell
-6,436
Closed -$398K – 2181
2023
Q4 		$398K Sell
6,436
-18,067
-74% -$949K ﹤0.01% 1898
2023
Q3 		$1.13M Buy
24,503
+396
+2% +$21.6K 0.01% 1245
2023
Q2 		$1.39M Buy
24,107
+8,097
+51% +$359K 0.02% 1105
2023
Q1 		$600K Buy
+16,010
New +$525K 0.01% 1514
2022
Q3 		– Sell
-30,676
Closed -$1.07M – 2281
2022
Q2 		$1.07M Sell
30,676
-9,719
-24% -$347K 0.03% 846
2022
Q1 		$1.45M Sell
40,395
-3,317
-8% -$94.1K 0.03% 711
2021
Q4 		$1.02M Buy
43,712
+253
+0.6% +$5.17K 0.02% 984
2021
Q3 		$826K Buy
43,459
+6,026
+16% +$118K 0.01% 1291
2021
Q2 		$755K Sell
37,433
-6,356
-15% -$120K 0.01% 986
2021
Q1 		$802K Buy
43,789
+17,667
+68% +$329K 0.02% 944
2020
Q4 		$525K Buy
+26,122
New +$508K 0.01% 930
2017
Q2 		– Sell
-35,387
Closed -$513K – 1020
2017
Q1 		$513K Buy
35,387
+8,960
+34% +$141K 0.02% 670
2016
Q4 		$487K Sell
26,427
-316
-1% -$6.15K 0.01% 735
2016
Q3 		$507K Sell
26,743
-3,533
-12% -$64.1K 0.01% 725
2016
Q2 		$488K Buy
30,276
+9,887
+48% +$140K 0.01% 849
2016
Q1 		$245K Buy
+20,389
New +$240K 0.01% 1404

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 $3.38T AUM 44.17% 1-Year Est. Return
Fuller & Thaler Asset Management
Fuller & Thaler Asset Management San Mateo, California $36.7B AUM 74.15% 1-Year Est. Return
BTW
Boston Trust Walden Boston, Massachusetts $13.1B AUM 24.63% 1-Year Est. Return
EIP
Epoch Investment Partners New York $17.6B AUM 34.17% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Marshall Wace
Marshall Wace London, United Kingdom $127B AUM 46.06% 1-Year Est. Return

Tudor Investment Corp's AMPH Position: Q3 2025 in Review

Tudor Investment Corp sold out of Amphastar Pharmaceuticals (AMPH) in Q3 2025, closing a stake of 12,916 shares — an estimated $297K sold.

Tudor Investment Corp first reported a position in AMPH in Q1 2016 and held it in 20 quarters. The position peaked at $1.45M in Q1 2022. 243 funds tracked by Wall St. Rank hold AMPH as of Q3 2025.

  • Tudor Investment Corp reported no remaining Amphastar Pharmaceuticals position as of Q3 2025 after selling out during the quarter.
  • Tudor Investment Corp sold 12,916 Amphastar Pharmaceuticals shares in Q3 2025, an estimated $297K.
  • Tudor Investment Corp first reported a position in Amphastar Pharmaceuticals in Q1 2016 and held it in 20 quarters.
  • Tudor Investment Corp's Amphastar Pharmaceuticals position peaked at $1.45M in Q1 2022.
  • 243 funds tracked by Wall St. Rank held Amphastar Pharmaceuticals as of Q3 2025.

Based on Tudor Investment Corp's 13F filing for Q3 2025, filed 14 Nov 2025.