Arrowstreet Capital, Limited Partnership Amphastar Pharmaceuticals, Inc. Transaction History

Arrowstreet Capital, Limited Partnership

$148 Billion
Q3 2025

A detailed history of Arrowstreet Capital, Limited Partnership transactions in Amphastar Pharmaceuticals, Inc. stock. As of the latest transaction made, Arrowstreet Capital, Limited Partnership holds 392,310 shares of AMPH stock, worth $10.2 Million. This represents 0.01% of its overall portfolio holdings.

Number of Shares

392,310

Previous 81,239 382.91%

Holding current value

$10.2 Million

Previous $1.87 Million 460.59%

% of portfolio

0.01%

Previous 0.0%

21 transactions

Quarter	Operation	Price Per share	shares change	shares Held
Q3 2025 Nov 13, 2025	BUY	$20.62 - $30.81 $6.41 Million - $9.58 Million	311,071 Added 382.91%	392,310 $10.5 Million
Q2 2025 Aug 13, 2025	BUY	$22.96 - $28.29 $1.87 Million - $2.3 Million	81,239 New	81,239 $1.87 Million
Q1 2024 May 15, 2024	BUY	$42.85 - $63.45 $965,796 - $1.43 Million	22,539 New	22,539 $990,000
Q3 2023 Nov 14, 2023	SELL	$45.51 - $65.0 $39,548 - $56,485	-869 Reduced 2.99%	28,230 $1.3 Million
Q2 2023 Aug 14, 2023	SELL	$35.77 - $58.38 $1.62 Million - $2.64 Million	-45,175 Reduced 60.82%	29,099 $1.67 Million

Q1 2023 May 15, 2023	SELL	$27.99 - $37.92 $2.57 Million - $3.48 Million	-91,766 Reduced 55.27%	74,274 $2.79 Million
Q4 2022 Feb 14, 2023	SELL	$27.93 - $31.27 $978,248 - $1.1 Million	-35,025 Reduced 17.42%	166,040 $4.65 Million
Q3 2022 Nov 14, 2022	SELL	$27.56 - $37.75 $2.86 Million - $3.91 Million	-103,607 Reduced 34.01%	201,065 $5.65 Million
Q2 2022 Aug 15, 2022	SELL	$29.79 - $42.29 $2.59 Million - $3.68 Million	-86,913 Reduced 22.2%	304,672 $10.6 Million
Q1 2022 May 13, 2022	SELL	$22.96 - $36.45 $561,693 - $891,712	-24,464 Reduced 5.88%	391,585 $14.1 Million
Q4 2021 Feb 14, 2022	BUY	$18.14 - $23.29 $3.95 Million - $5.07 Million	217,577 Added 109.63%	416,049 $9.69 Million
Q3 2021 Nov 12, 2021	BUY	$17.83 - $21.49 $937,037 - $1.13 Million	52,554 Added 36.02%	198,472 $3.77 Million
Q2 2021 Aug 13, 2021	BUY	$17.11 - $20.92 $1.54 Million - $1.88 Million	90,049 Added 161.18%	145,918 $2.94 Million
Q1 2021 May 14, 2021	BUY	$17.21 - $20.65 $961,505 - $1.15 Million	55,869 New	55,869 $1.02 Million
Q1 2020 May 15, 2020	SELL	$12.66 - $20.08 $6.6 Million - $10.5 Million	-520,984 Closed	0 $0
Q4 2019 Feb 13, 2020	BUY	$17.07 - $20.64 $1.15 Million - $1.39 Million	67,149 Added 14.8%	520,984 $10.1 Million
Q3 2019 Nov 14, 2019	BUY	$19.12 - $22.62 $5.5 Million - $6.5 Million	287,533 Added 172.9%	453,835 $9 Million
Q2 2019 Aug 14, 2019	BUY	$18.92 - $22.96 $298,198 - $361,872	15,761 Added 10.47%	166,302 $3.51 Million
Q1 2019 May 15, 2019	BUY	$19.46 - $25.28 $2.93 Million - $3.81 Million	150,541 New	150,541 $3.08 Million
Q3 2018 Nov 14, 2018	SELL	$15.39 - $19.38 $536,187 - $675,199	-34,840 Closed	0 $0
Q2 2018 Aug 14, 2018	BUY	$14.63 - $19.6 $509,709 - $682,864	34,840 New	34,840 $532,000

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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Arrowstreet Capital, Limited Partnership Amphastar Pharmaceuticals, Inc. Transaction History