CHARLES SCHWAB INVESTMENT MANAGEMENT INC

Position in AMPH — Amphastar Pharmaceuticals, Inc.

CIK 884546 SAN FRANCISCO, CA

Back to AMPH Full portfolio

Position in AMPH

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

Position Value

$6,289,154

-$3,102,779 QoQ

Shares Held

321,039

-8.5% QoQ

Ownership

0.728%

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 99.98722896595118.ToString("F0")% Shared 0.ToString("F0")% None 0.012771034048822728.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

CHARLES SCHWAB INVESTMENT MANAGEMENT INC holds $1,628,257,886 across 43 Drug Manufacturers - Specialty & Generic names. AMPH ranks #29 (0.4% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	ZTS	Zoetis Inc.	3,717,247	$439,415,767
2	VTRS	Viatris Inc	13,674,306	$184,739,874
3	UTHR	UNITED THERAPEUTICS Corp	300,481	$178,179,223
4	NBIX	Neurocrine Biosciences Inc	902,788	$118,933,291
5	ELAN	Elanco Animal Health Inc	3,577,850	$85,617,950
6	ALKS	Alkermes plc.	2,236,756	$79,091,692
7	TEVA	Teva Pharmaceutical Industries Ltd	2,087,679	$62,880,891
8	LNTH	Lantheus Holdings, Inc.	657,413	$49,864,776

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	$6,289,154	321,039	-8.5%	Shares	Sole	2026-05-15
2025-12-31	$9,391,933	350,707	-1.6%	Shares	Sole	2026-02-13
2025-09-30	$9,498,299	356,409	+2.8%	Shares	Sole	2025-11-10
2025-06-30	$7,962,160	346,784	+6.3%	Shares	Sole	2025-08-12
2025-03-31	$9,457,291	326,226	-6.1%	Shares	Sole	2025-09-15
2024-12-31	$12,903,120	347,512	-0.7%	Shares	Sole	2025-02-06
2024-09-30	$16,988,217	350,056	-2.6%	Shares	Sole	2024-11-12
2024-06-30	$14,368,880	359,222	+0.8%	Shares	Sole	2024-08-12
2024-03-31	$15,649,743	356,405	-6.1%	Shares	Sole	2024-05-09
2023-12-31	$23,470,838	379,480	+7.7%	Shares	Sole	2024-02-06
2023-09-30	$16,205,864	352,378	+7.3%	Shares	Sole	2023-11-08
2023-06-30	$18,865,217	328,262	-0.5%	Shares	Sole	2023-08-10
2023-03-31	$12,371,737	329,913	+1.0%	Shares	Sole	2023-05-12
2022-12-31	$9,156,599	326,788	+6.3%	Shares	Sole	2023-02-13
2022-09-30	$8,634,933	307,293	-2.4%	Shares	Sole	2022-11-14
2022-06-30	$10,951,648	314,793	+17.3%	Shares	Sole	2022-08-15
2022-03-31	$9,635,488	268,398	+2.9%	Shares	Sole	2022-05-13
2021-12-31	$6,077,176	260,935	+3.2%	Shares	Sole	2022-02-11
2021-09-30	$4,805,100	252,767	-0.2%	Shares	Sole	2021-11-16
2021-06-30	$5,108,281	253,387	+2.2%	Shares	Sole	2021-08-16
2021-03-31	$4,541,509	247,899	+2.4%	Shares	Sole	2021-05-17
2020-12-31	$4,869,596	242,148	+2.1%	Shares	Sole	2021-02-16
2020-09-30	$4,446,225	237,132	+4.0%	Shares	Sole	2020-11-13
2020-06-30	$5,123,148	228,101	+3.6%	Shares	Sole	2020-08-20
2020-03-31	$3,266,165	220,092	—	Shares	Sole	2020-05-15
No filing history on record for this holder in this stock.