A detailed history of Oberweis Asset Management Inc transactions in Amphastar Pharmaceuticals, Inc. stock. As of the latest transaction made, Oberweis Asset Management Inc holds 161,155 shares of AMPH stock, worth $7.33 Million. This represents 0.42% of its overall portfolio holdings.

Number of Shares
161,155
Previous 135,055 19.33%
Holding current value
$7.33 Million
Previous $5.4 Million 44.76%
% of portfolio
0.42%
Previous 0.34%

Shares

12 transactions
Quarter Operation Price Per share shares change shares Held SEC Form
Q3 2024

Nov 14, 2024

BUY
$36.99 - $50.09 $965,439 - $1.31 Million
26,100 Added 19.33%
161,155 $7.82 Million
Q2 2024

Aug 14, 2024

SELL
$38.65 - $43.48 $10.9 Million - $12.3 Million
-282,810 Reduced 67.68%
135,055 $5.4 Million
Q1 2024

May 15, 2024

BUY
$42.85 - $63.45 $3.33 Million - $4.92 Million
77,600 Added 22.81%
417,865 $18.3 Million
Q4 2023

Feb 14, 2024

BUY
$44.49 - $62.93 $8.35 Million - $11.8 Million
187,765 Added 123.12%
340,265 $21 Million
Q3 2023

Nov 14, 2023

BUY
$45.51 - $65.0 $213,897 - $305,500
4,700 Added 3.18%
152,500 $7.01 Million
Q2 2023

Aug 14, 2023

SELL
$35.77 - $58.38 $1.09 Million - $1.77 Million
-30,400 Reduced 17.06%
147,800 $8.49 Million
Q1 2023

May 15, 2023

BUY
$27.99 - $37.92 $1.24 Million - $1.68 Million
44,200 Added 32.99%
178,200 $6.68 Million
Q4 2022

Feb 14, 2023

BUY
$27.93 - $31.27 $907,725 - $1.02 Million
32,500 Added 32.02%
134,000 $3.75 Million
Q3 2022

Nov 14, 2022

BUY
$27.56 - $37.75 $2.3 Million - $3.16 Million
83,600 Added 467.04%
101,500 $2.85 Million
Q2 2022

Aug 15, 2022

BUY
$29.79 - $42.29 $131,076 - $186,076
4,400 Added 32.59%
17,900 $623,000
Q4 2021

Feb 14, 2022

BUY
$18.14 - $23.29 $52,606 - $67,541
2,900 Added 27.36%
13,500 $314,000
Q2 2021

Aug 16, 2021

BUY
$17.11 - $20.92 $181,366 - $221,752
10,600 New
10,600 $214,000

Others Institutions Holding AMPH

About Amphastar Pharmaceuticals, Inc.


  • Ticker AMPH
  • Exchange NASDAQ
  • Sector Healthcare
  • Industry Drug Manufacturers—Specialty & Generic
  • Shares Outstandng 49,015,200
  • Market Cap $2.23B
  • Description
  • Amphastar Pharmaceuticals, Inc., a bio-pharmaceutical company, develops, manufactures, markets, and sells generic and proprietary injectable, inhalation, and intranasal products in the United States, China, and France. The company operates through two segments, Finished Pharmaceutical Products and API. It offers Primatene Mist, an over-the-count...
More about AMPH
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