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
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 $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

Voloridge Investment Management's AMPH Position: Q1 2026 in Review

Voloridge Investment Management reduced its Amphastar Pharmaceuticals (AMPH) stake by 26% in Q1 2026, selling an estimated $1.47M and leaving 171,188 shares worth $3.35M. The position accounts for 0.01% of the portfolio, ranked #752.

Voloridge Investment Management first reported a position in AMPH in Q3 2020 and has held it in 18 quarters since. The position peaked at $17.1M in Q3 2023. 215 funds tracked by Wall St. Rank hold AMPH as of Q1 2026.

  • Voloridge Investment Management held 171,188 shares of Amphastar Pharmaceuticals worth $3.35M as of Q1 2026.
  • Voloridge Investment Management sold 60,117 Amphastar Pharmaceuticals shares in Q1 2026, an estimated $1.47M.
  • Amphastar Pharmaceuticals made up 0.01% of Voloridge Investment Management's portfolio in Q1 2026, its #752 holding.
  • Voloridge Investment Management first reported a position in Amphastar Pharmaceuticals in Q3 2020 and has held it in 18 quarters since.
  • Voloridge Investment Management's Amphastar Pharmaceuticals position peaked at $17.1M in Q3 2023.
  • 215 funds tracked by Wall St. Rank held Amphastar Pharmaceuticals as of Q1 2026.

Based on Voloridge Investment Management's 13F filing for Q1 2026, filed 15 May 2026.