RENAISSANCE TECHNOLOGIES LLC

Position in AMPH — Amphastar Pharmaceuticals, Inc.

CIK 1037389 NEW YORK, NY

Back to AMPH Full portfolio

Position in AMPH

as of Mar 31, 2026 · filed May 14, 2026 Compact

Position Value

$10,850,901

-$3,736,165 QoQ

Shares Held

553,900

+1.7% QoQ

Ownership

1.26%

of shares outstanding

% of Portfolio

0.02%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2020

25 quarters on record

Voting authority Sole 100.ToString("F0")% Shared 0.ToString("F0")% None 0.ToString("F0")%

Common Shares in AMPH Over Time

Shares Held

Position Value (USD)

Position in Drug Manufacturers - Specialty & Generic

Healthcare · as of Mar 31, 2026

RENAISSANCE TECHNOLOGIES LLC holds $2,196,847,717 across 49 Drug Manufacturers - Specialty & Generic names. AMPH ranks #14 (0.5% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	UTHR	UNITED THERAPEUTICS Corp	1,787,019	$1,059,666,526
2	NBIX	Neurocrine Biosciences Inc	2,418,897	$318,665,490
3	ALKS	Alkermes plc.	6,160,428	$217,832,734
4	RDY	Dr Reddys Laboratories Ltd	7,859,728	$108,857,232
5	SUPN	Supernus Pharmaceuticals, Inc.	1,705,222	$88,142,925
6	TAK	Takeda Pharmaceutical Co Ltd	2,989,100	$55,358,132
7	COLL	Collegium Pharmaceutical, Inc	1,469,449	$48,594,678
8	HIMS	Hims & Hers Health, Inc.	2,118,080	$43,971,340

All Filings in AMPH

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25 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$10,850,901	553,900	+1.7%	Shares	Sole	2026-05-14
2025-12-31	$14,587,066	544,700	-7.2%	Shares	Sole	2026-02-12
2025-09-30	$15,640,885	586,900	+1.8%	Shares	Sole	2025-11-13
2025-06-30	$13,236,440	576,500	+16.5%	Shares	Sole	2025-08-13
2025-03-31	$14,350,050	495,000	-5.8%	Shares	Sole	2025-05-14
2024-12-31	$19,511,815	525,500	+7.4%	Shares	Sole	2025-02-13
2024-09-30	$23,750,582	489,400	-9.0%	Shares	Sole	2024-11-13
2024-06-30	$21,508,000	537,700	-10.2%	Shares	Sole	2024-08-09
2024-03-31	$26,306,481	599,100	-6.7%	Shares	Sole	2024-05-13
2023-12-31	$39,701,515	641,900	+6.4%	Shares	Sole	2024-02-13
2023-09-30	$27,736,569	603,100	+22.4%	Shares	Sole	2023-11-14
2023-06-30	$28,308,745	492,583	-0.8%	Shares	Sole	2023-08-11
2023-03-31	$18,630,000	496,800	+11.0%	Shares	Sole	2023-05-12
2022-12-31	$12,536,148	447,400	+3.1%	Shares	Sole	2023-02-13
2022-09-30	$12,189,780	433,800	+6.6%	Shares	Sole	2022-11-14
2022-06-30	$14,156,051	406,900	+31.8%	Shares	Sole	2022-08-12
2022-03-31	$11,082,330	308,700	+6.5%	Shares	Sole	2022-05-13
2021-12-31	$6,749,442	289,800	+5.1%	Shares	Sole	2022-02-11
2021-09-30	$5,241,057	275,700	+11.6%	Shares	Sole	2021-11-12
2021-06-30	$4,981,536	247,100	+9.5%	Shares	Sole	2021-08-13
2021-03-31	$4,132,992	225,600	-27.8%	Shares	Sole	2021-05-13
2020-12-31	$6,286,386	312,600	-17.4%	Shares	Sole	2021-02-10
2020-09-30	$7,093,125	378,300	-26.0%	Shares	Sole	2020-11-13
2020-06-30	$11,483,798	511,300	-30.8%	Shares	Sole	2020-08-13
2020-03-31	$10,960,824	738,600	—	Shares	Sole	2020-05-14
No filing history on record for this holder in this stock.