Assenagon Asset Management
AMPH icon

Assenagon Asset Management’s Amphastar Pharmaceuticals AMPH Stock Holding History

Assenagon Asset 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 		$307K Hold
15,216
– – ﹤0.01% 1119
2026
Q1 		$298K Hold
15,216
– – ﹤0.01% 1056
2025
Q4 		$407K Hold
15,216
– – ﹤0.01% 1065
2025
Q3 		$406K Sell
15,216
-1,394
-8% -$36K ﹤0.01% 1086
2025
Q2 		$381K Buy
16,610
+1,394
+9% +$34.6K ﹤0.01% 1070
2025
Q1 		$441K Sell
15,216
-146,183
-91% -$4.67M ﹤0.01% 1036
2024
Q4 		$5.99M Sell
161,399
-5,956
-4% -$272K 0.01% 646
2024
Q3 		$8.12M Sell
167,355
-22,250
-12% -$976K 0.01% 582
2024
Q2 		$7.58M Buy
189,605
+35,306
+23% +$1.46M 0.02% 503
2024
Q1 		$6.78M Buy
+154,299
New +$7.97M 0.02% 524
2023
Q3 		– Sell
-12,123
Closed -$697K – 1378
2023
Q2 		$697K Sell
12,123
-156,933
-93% -$6.96M ﹤0.01% 1060
2023
Q1 		$6.34M Sell
169,056
-4,423
-3% -$145K 0.02% 507
2022
Q4 		$4.86M Buy
173,479
+28,263
+19% +$821K 0.02% 538
2022
Q3 		$4.08M Sell
145,216
-273,801
-65% -$8.94M 0.02% 535
2022
Q2 		$14.6M Sell
419,017
-8,588
-2% -$306K 0.05% 288
2022
Q1 		$15.4M Sell
427,605
-100,073
-19% -$2.84M 0.04% 279
2021
Q4 		$12.3M Buy
527,678
+349,875
+197% +$7.15M 0.04% 285
2021
Q3 		$3.38M Sell
177,803
-12,214
-6% -$239K 0.01% 533
2021
Q2 		$3.83M Buy
190,017
+29,770
+19% +$561K 0.01% 540
2021
Q1 		$2.94M Buy
+160,247
New +$2.98M 0.01% 626
2019
Q1 		– Sell
-65,926
Closed -$1.31M – 932
2018
Q4 		$1.31M Buy
+65,926
New +$1.3M 0.01% 582

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

Assenagon Asset Management's AMPH Position: Q2 2026 in Review

Assenagon Asset Management held its Amphastar Pharmaceuticals (AMPH) position steady in Q2 2026 at 15,216 shares worth $307K. The position accounts for ﹤0.01% of the portfolio, ranked #1119.

Assenagon Asset Management first reported a position in AMPH in Q4 2018 and has held it in 21 quarters since. The position peaked at $15.4M in Q1 2022. 210 funds tracked by Wall St. Rank hold AMPH as of Q2 2026.

  • Assenagon Asset Management held 15,216 shares of Amphastar Pharmaceuticals worth $307K as of Q2 2026.
  • Assenagon Asset Management left its Amphastar Pharmaceuticals share count unchanged in Q2 2026.
  • Amphastar Pharmaceuticals made up ﹤0.01% of Assenagon Asset Management's portfolio in Q2 2026, its #1119 holding.
  • Assenagon Asset Management first reported a position in Amphastar Pharmaceuticals in Q4 2018 and has held it in 21 quarters since.
  • Assenagon Asset Management's Amphastar Pharmaceuticals position peaked at $15.4M in Q1 2022.
  • 210 funds tracked by Wall St. Rank held Amphastar Pharmaceuticals as of Q2 2026.

Based on Assenagon Asset Management's 13F filing for Q2 2026, filed 8 Jul 2026.