AQR CAPITAL MANAGEMENT LLC

Position in AMPH — Amphastar Pharmaceuticals, Inc.

CIK 1167557 Greenwich, CT

Back to AMPH Full portfolio

Position in AMPH

as of Mar 31, 2026 · filed May 15, 2026 Compact

Position Value

$1,543,260

-$268,458 QoQ

Shares Held

78,778

+16.4% QoQ

Ownership

0.179%

of shares outstanding

% of Portfolio

0.00%

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

AQR CAPITAL MANAGEMENT LLC holds $1,491,893,072 across 43 Drug Manufacturers - Specialty & Generic names. AMPH ranks #31 (0.1% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	NBIX	Neurocrine Biosciences Inc	4,938,967	$650,659,508
2	UTHR	UNITED THERAPEUTICS Corp	826,226	$489,935,489
3	VTRS	Viatris Inc	6,341,318	$85,671,200
4	ZTS	Zoetis Inc.	607,950	$71,865,765
5	IRWD	Ironwood Pharmaceuticals Inc	7,535,080	$26,448,126
6	KNSA	Kiniksa Pharmaceuticals International, plc	378,697	$18,234,258
7	TAK	Takeda Pharmaceutical Co Ltd	894,423	$16,564,712
8	ALKS	Alkermes plc.	383,977	$13,577,424

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	$1,543,260	78,778	+16.4%	Shares	Other	2026-05-15
2025-12-31	$1,811,718	67,652	+8.9%	Shares	Defined	2026-02-17
2025-09-30	$1,656,162	62,145	-18.1%	Shares	Other	2025-11-14
2025-06-30	$1,741,398	75,845	+41.4%	Shares	Defined	2025-08-14
2025-03-31	$1,554,963	53,638	+82.0%	Shares	Other	2025-05-15
2024-12-31	$1,094,257	29,471	-29.3%	Shares	Defined	2025-02-14
2024-09-30	$2,022,098	41,667	-25.3%	Shares	Other	2024-11-14
2024-06-30	$2,231,840	55,796	-2.2%	Shares	Defined	2024-08-14
2024-03-31	$2,505,240	57,054	+347.7%	Shares	Other	2024-05-15
2023-12-31	$788,216	12,744	-56.0%	Shares	Defined	2024-02-14
2023-09-30	$1,333,250	28,990	-50.9%	Shares	Defined	2023-11-14
2023-06-30	$3,392,798	59,036	-46.8%	Shares	Defined	2023-08-14
2023-03-31	$4,158,262	110,887	-1.5%	Shares	Defined	2023-05-15
2022-12-31	$3,155,136	112,603	+18.8%	Shares	Defined	2023-02-14
2022-09-30	$2,662,559	94,753	+168.5%	Shares	Defined	2022-11-14
2022-06-30	$1,227,739	35,290	+161.4%	Shares	Defined	2022-08-15
2022-03-31	$484,614	13,499	+27.7%	Shares	Defined	2022-05-16
2021-12-31	$246,291	10,575	-45.1%	Shares	Defined	2022-02-14
2021-09-30	$366,455	19,277	-3.0%	Shares	Defined	2021-11-15
2021-06-30	$400,538	19,868	-19.0%	Shares	Defined	2021-08-16
2021-03-31	$449,224	24,521	-33.1%	Shares	Defined	2021-05-17
2020-12-31	$736,951	36,646	-30.2%	Shares	Defined	2021-02-16
2020-09-30	$983,906	52,475	-30.9%	Shares	Defined	2020-11-16
2020-06-30	$1,706,353	75,973	-14.5%	Shares	Defined	2020-08-17
2020-03-31	$1,318,474	88,846	—	Shares	Defined	2020-05-15
No filing history on record for this holder in this stock.