David A. Siegel Amphastar Pharmaceuticals, Inc. Transaction History

Two Sigma Advisers, LP

$46.1 Billion
Q2 2025

A detailed history of David A. Siegel (Two Sigma Advisers, LP) transactions in Amphastar Pharmaceuticals, Inc. stock. As of the latest transaction made, Two Sigma Advisers, LP holds 95,200 shares of AMPH stock, worth $2.26 Million. This represents 0.0% of its overall portfolio holdings.

Number of Shares

95,200

Previous 84,700 12.4%

Holding current value

$2.26 Million

Previous $2.46 Million 11.0%

% of portfolio

0.0%

Previous 0.01%

29 transactions

Quarter	Operation	Price Per share	shares change	shares Held
Q2 2025 Aug 14, 2025	BUY	$22.96 - $28.29 $241,080 - $297,045	10,500 Added 12.4%	95,200 $2.19 Million
Q1 2025 May 15, 2025	SELL	$26.24 - $38.48 $31,487 - $46,175	-1,200 Reduced 1.4%	84,700 $2.46 Million
Q4 2024 Feb 14, 2025	SELL	$36.84 - $53.4 $456,816 - $662,160	-12,400 Reduced 12.61%	85,900 $3.19 Million
Q3 2024 Nov 14, 2024	SELL	$36.99 - $50.09 $288,522 - $390,702	-7,800 Reduced 7.35%	98,300 $4.77 Million
Q2 2024 Aug 14, 2024	SELL	$38.65 - $43.48 $765,270 - $860,903	-19,800 Reduced 15.73%	106,100 $4.24 Million
Q1 2024 May 15, 2024	SELL	$42.85 - $63.45 $64,275 - $95,175	-1,500 Reduced 1.18%	125,900 $5.53 Million
Q4 2023 Feb 14, 2024	BUY	$44.49 - $62.93 $1.87 Million - $2.64 Million	42,000 Added 49.18%	127,400 $7.88 Million
Q3 2023 Nov 14, 2023	BUY	$45.51 - $65.0 $582,528 - $832,000	12,800 Added 17.63%	85,400 $3.93 Million
Q2 2023 Aug 14, 2023	BUY	$35.77 - $58.38 $482,895 - $788,130	13,500 Added 22.84%	72,600 $4.17 Million
Q1 2023 May 15, 2023	SELL	$27.99 - $37.92 $596,187 - $807,696	-21,300 Reduced 26.49%	59,100 $2.22 Million
Q4 2022 Feb 14, 2023	SELL	$27.93 - $31.27 $284,886 - $318,954	-10,200 Reduced 11.26%	80,400 $2.25 Million
Q3 2022 Nov 14, 2022	SELL	$27.56 - $37.75 $573,248 - $785,200	-20,800 Reduced 18.67%	90,600 $2.55 Million
Q2 2022 Aug 15, 2022	BUY	$29.79 - $42.29 $2.61 Million - $3.71 Million	87,700 Added 370.04%	111,400 $3.88 Million
Q1 2022 May 16, 2022	BUY	$22.96 - $36.45 $142,352 - $225,990	6,200 Added 35.43%	23,700 $851,000
Q4 2021 Feb 14, 2022	BUY	$18.14 - $23.29 $16,326 - $20,961	900 Added 5.42%	17,500 $408,000
Q3 2021 Nov 15, 2021	SELL	$17.83 - $21.49 $14,263 - $17,192	-800 Reduced 4.6%	16,600 $316,000
Q2 2021 Aug 16, 2021	SELL	$17.11 - $20.92 $362,732 - $443,504	-21,200 Reduced 54.92%	17,400 $351,000
Q1 2021 May 17, 2021	SELL	$17.21 - $20.65 $49,909 - $59,884	-2,900 Reduced 6.99%	38,600 $707,000
Q4 2020 Feb 16, 2021	SELL	$17.76 - $21.24 $2.05 Million - $2.46 Million	-115,600 Reduced 73.58%	41,500 $835,000
Q3 2020 Nov 16, 2020	BUY	$17.99 - $22.22 $2.83 Million - $3.49 Million	157,100 New	157,100 $2.95 Million
Q4 2019 Feb 14, 2020	SELL	$17.07 - $20.64 $380,661 - $460,272	-22,300 Closed	0 $0
Q3 2019 Nov 14, 2019	SELL	$19.12 - $22.62 $240,912 - $285,012	-12,600 Reduced 36.1%	22,300 $442,000
Q2 2019 Aug 14, 2019	BUY	$18.92 - $22.96 $192,984 - $234,192	10,200 Added 41.3%	34,900 $737,000
Q1 2019 May 15, 2019	BUY	$19.46 - $25.28 $212,114 - $275,552	10,900 Added 78.99%	24,700 $505,000
Q4 2018 Feb 14, 2019	BUY	$17.72 - $22.51 $244,535 - $310,638	13,800 New	13,800 $275,000
Q2 2018 Aug 14, 2018	SELL	$14.63 - $19.6 $178,486 - $239,120	-12,200 Closed	0 $0
Q1 2018 May 15, 2018	BUY	$17.23 - $20.35 $210,206 - $248,270	12,200 New	12,200 $229,000
Q4 2017 Feb 14, 2018	SELL	$17.76 - $19.75 $182,928 - $203,425	-10,300 Closed	0 $0
Q3 2017 Nov 14, 2017	BUY	$14.73 - $17.99 $151,719 - $185,296	10,300	10,300 $184,000

Others Institutions Holding AMPH

# of Institutions

261

Shares Held

33.1M

Call Options Held

18.3K

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 $1.16B
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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