Marshall Wace, LLP Amphastar Pharmaceuticals, Inc. Transaction History

Marshall Wace, LLP

$90.8 Billion
Q3 2025

A detailed history of Marshall Wace, LLP transactions in Amphastar Pharmaceuticals, Inc. stock. As of the latest transaction made, Marshall Wace, LLP holds 874,068 shares of AMPH stock, worth $22.8 Million. This represents 0.03% of its overall portfolio holdings.

Number of Shares

874,068

Previous 848,685 2.99%

Holding current value

$22.8 Million

Previous $19.5 Million 19.54%

% of portfolio

0.03%

Previous 0.02%

15 transactions

Quarter	Operation	Price Per share	shares change	shares Held
Q3 2025 Nov 13, 2025	BUY	$20.62 - $30.81 $523,397 - $782,050	25,383 Added 2.99%	874,068 $23.3 Million
Q2 2025 Aug 13, 2025	SELL	$22.96 - $28.29 $4.2 Million - $5.18 Million	-183,037 Reduced 17.74%	848,685 $19.5 Million
Q1 2025 May 15, 2025	BUY	$26.24 - $38.48 $11.1 Million - $16.3 Million	423,016 Added 69.49%	1,031,722 $29.9 Million
Q4 2024 Feb 13, 2025	BUY	$36.84 - $53.4 $1.48 Million - $2.15 Million	40,212 Added 7.07%	608,706 $22.6 Million
Q3 2024 Nov 14, 2024	BUY	$36.99 - $50.09 $12.6 Million - $17.1 Million	341,367 Added 150.3%	568,494 $27.6 Million

Q2 2024 Aug 14, 2024	BUY	$38.65 - $43.48 $8.78 Million - $9.88 Million	227,127 New	227,127 $9.09 Million
Q1 2023 May 15, 2023	BUY	$27.99 - $37.92 $1.8 Million - $2.43 Million	64,209 New	64,209 $2.41 Million
Q3 2022 Nov 14, 2022	BUY	$27.56 - $37.75 $88,109 - $120,686	3,197 Added 11.24%	31,638 $890,000
Q2 2022 Aug 15, 2022	BUY	$29.79 - $42.29 $328,404 - $466,204	11,024 Added 63.29%	28,441 $989,000
Q1 2022 May 16, 2022	BUY	$22.96 - $36.45 $399,894 - $634,849	17,417 New	17,417 $625,000
Q3 2020 Nov 16, 2020	SELL	$17.99 - $22.22 $2.38 Million - $2.94 Million	-132,228 Closed	0 $0
Q2 2020 Aug 13, 2020	SELL	$14.25 - $22.46 $2.42 Million - $3.81 Million	-169,682 Reduced 56.2%	132,228 $2.97 Million
Q1 2020 May 15, 2020	BUY	$12.66 - $20.08 $99,330 - $157,547	7,846 Added 2.67%	301,910 $4.48 Million
Q4 2019 Feb 14, 2020	SELL	$17.07 - $20.64 $2.04 Million - $2.46 Million	-119,229 Reduced 28.85%	294,064 $5.67 Million
Q3 2019 Nov 14, 2019	BUY	$19.12 - $22.62 $7.9 Million - $9.35 Million	413,293 New	413,293 $8.2 Million

Others Institutions Holding AMPH

# of Institutions

262

Shares Held

33.5M

Call Options Held

73.4K

Put Options Held

12.6K

View Full List

About Amphastar Pharmaceuticals, Inc.

Ticker AMPH
Exchange NASDAQ
Sector Healthcare
Industry Drug Manufacturers—Specialty & Generic
Shares Outstandng 49,015,200
Market Cap $1.28B
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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Marshall Wace, LLP Amphastar Pharmaceuticals, Inc. Transaction History