Voloridge Investment Management
AMPH icon

Voloridge Investment Management’s Amphastar Pharmaceuticals AMPH Stock Holding History

Voloridge Investment 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
Q2 		$1.03M Sell
50,912
-120,276
-70% -$2.43M ﹤0.01% 714
2026
Q1 		$3.35M Sell
171,188
-60,117
-26% -$1.47M 0.01% 752
2025
Q4 		$6.19M Sell
231,305
-61,138
-21% -$1.57M 0.02% 709
2025
Q3 		$7.79M Sell
292,443
-33,069
-10% -$854K 0.03% 617
2025
Q2 		$7.47M Buy
325,512
+109,510
+51% +$2.72M 0.03% 637
2025
Q1 		$6.26M Buy
216,002
+72,566
+51% +$2.32M 0.02% 718
2024
Q4 		$5.33M Buy
143,436
+19,991
+16% +$914K 0.02% 761
2024
Q3 		$5.99M Sell
123,445
-78,028
-39% -$3.42M 0.02% 736
2024
Q2 		$8.06M Sell
201,473
-20,327
-9% -$842K 0.03% 625
2024
Q1 		$9.74M Sell
221,800
-6,869
-3% -$355K 0.04% 497
2023
Q4 		$14.1M Sell
228,669
-142,641
-38% -$7.49M 0.06% 390
2023
Q3 		$17.1M Buy
371,310
+183,371
+98% +$10M 0.08% 317
2023
Q2 		$10.8M Buy
187,939
+114,995
+158% +$5.1M 0.05% 443
2023
Q1 		$2.74M Sell
72,944
-21,677
-23% -$711K 0.01% 889
2022
Q4 		$2.65M Sell
94,621
-67,637
-42% -$1.96M 0.01% 895
2022
Q3 		$4.56M Sell
162,258
-14,724
-8% -$481K 0.02% 681
2022
Q2 		$6.16M Buy
176,982
+82,912
+88% +$2.96M 0.03% 600
2022
Q1 		$3.38M Buy
+94,070
New +$2.67M 0.02% 783
2020
Q4 		– Sell
-45,541
Closed -$854K – 1302
2020
Q3 		$854K Buy
+45,541
New +$917K 0.01% 981

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 $3.38T AUM 44.17% 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

Voloridge Investment Management's AMPH Position: Q2 2026 in Review

Voloridge Investment Management reduced its Amphastar Pharmaceuticals (AMPH) stake by 70% in Q2 2026, selling an estimated $2.43M and leaving 50,912 shares worth $1.03M. The position accounts for ﹤0.01% of the portfolio, ranked #714.

Voloridge Investment Management first reported a position in AMPH in Q3 2020 and has held it in 19 quarters since. The position peaked at $17.1M in Q3 2023. 211 funds tracked by Wall St. Rank hold AMPH as of Q2 2026.

  • Voloridge Investment Management held 50,912 shares of Amphastar Pharmaceuticals worth $1.03M as of Q2 2026.
  • Voloridge Investment Management sold 120,276 Amphastar Pharmaceuticals shares in Q2 2026, an estimated $2.43M.
  • Amphastar Pharmaceuticals made up ﹤0.01% of Voloridge Investment Management's portfolio in Q2 2026, its #714 holding.
  • Voloridge Investment Management first reported a position in Amphastar Pharmaceuticals in Q3 2020 and has held it in 19 quarters since.
  • Voloridge Investment Management's Amphastar Pharmaceuticals position peaked at $17.1M in Q3 2023.
  • 211 funds tracked by Wall St. Rank held Amphastar Pharmaceuticals as of Q2 2026.

Based on Voloridge Investment Management's 13F filing for Q2 2026, filed 14 Aug 2026.