OAM
AMPH icon

Oberweis Asset Management’s Amphastar Pharmaceuticals AMPH Stock Holding History

Oberweis 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
2025
Q1 		– Sell
-184,595
Closed -$6.85M – 192
2024
Q4 		$6.85M Buy
184,595
+23,440
+15% +$1.07M 0.32% 114
2024
Q3 		$7.82M Buy
161,155
+26,100
+19% +$1.15M 0.4% 96
2024
Q2 		$5.4M Sell
135,055
-282,810
-68% -$11.7M 0.33% 117
2024
Q1 		$18.3M Buy
417,865
+77,600
+23% +$4.01M 1.33% 8
2023
Q4 		$21M Buy
340,265
+187,765
+123% +$9.86M 1.96% 6
2023
Q3 		$7.01M Buy
152,500
+4,700
+3% +$256K 0.75% 28
2023
Q2 		$8.49M Sell
147,800
-30,400
-17% -$1.35M 1.03% 17
2023
Q1 		$6.68M Buy
178,200
+44,200
+33% +$1.45M 1.04% 15
2022
Q4 		$3.75M Buy
134,000
+32,500
+32% +$944K 0.8% 26
2022
Q3 		$2.85M Buy
101,500
+83,600
+467% +$2.73M 0.67% 29
2022
Q2 		$623K Buy
17,900
+4,400
+33% +$157K 0.16% 104
2022
Q1 		$485K Hold
13,500
– – 0.1% 113
2021
Q4 		$314K Buy
13,500
+2,900
+27% +$59.3K 0.06% 130
2021
Q3 		$202K Hold
10,600
– – 0.04% 155
2021
Q2 		$214K Buy
+10,600
New +$200K 0.05% 152
2017
Q1 		– Sell
-27,200
Closed -$501K – 139
2016
Q4 		$501K Hold
27,200
– – 0.15% 93
2016
Q3 		$516K Hold
27,200
– – 0.15% 95
2016
Q2 		$438K Buy
+27,200
New +$384K 0.13% 116

Other funds holding AMPH

BlackRock
BlackRock New York $5.72T AUM 30.48% 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 $123B AUM 34.51% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return
Fuller & Thaler Asset Management
Fuller & Thaler Asset Management San Mateo, California $29.7B AUM 43.33% 1-Year Est. Return
EIP
Epoch Investment Partners New York $16.5B AUM 24.3% 1-Year Est. Return
BTW
Boston Trust Walden Boston, Massachusetts $12.2B AUM 12.45% 1-Year Est. Return
Marshall Wace
Marshall Wace London, United Kingdom $100B AUM 35.1% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

Oberweis Asset Management's AMPH Position: Q1 2025 in Review

Oberweis Asset Management sold out of Amphastar Pharmaceuticals (AMPH) in Q1 2025, closing a stake of 184,595 shares — an estimated $6.85M sold.

Oberweis Asset Management first reported a position in AMPH in Q2 2016 and held it in 18 quarters. The position peaked at $21M in Q4 2023. 241 funds tracked by Wall St. Rank hold AMPH as of Q1 2025.

  • Oberweis Asset Management reported no remaining Amphastar Pharmaceuticals position as of Q1 2025 after selling out during the quarter.
  • Oberweis Asset Management sold 184,595 Amphastar Pharmaceuticals shares in Q1 2025, an estimated $6.85M.
  • Oberweis Asset Management first reported a position in Amphastar Pharmaceuticals in Q2 2016 and held it in 18 quarters.
  • Oberweis Asset Management's Amphastar Pharmaceuticals position peaked at $21M in Q4 2023.
  • 241 funds tracked by Wall St. Rank held Amphastar Pharmaceuticals as of Q1 2025.

Based on Oberweis Asset Management's 13F filing for Q1 2025, filed 15 May 2025.