ADVISORY RESEARCH INC

Position in AMPH — Amphastar Pharmaceuticals, Inc.

CIK 902584 CHICAGO, IL

Position in AMPH

as of Jun 30, 2026 · filed Aug 13, 2026 Compact

Position Value

$511,300

+$14,988 QoQ

Shares Held

25,337

+0.0% QoQ

Ownership

0.060%

of shares outstanding

% of Portfolio

0.05%

of 13F equity value

Holder Rank

#88

of 209 holders

Holding Since

Sep 2022

15 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Healthcare · as of Jun 30, 2026

ADVISORY RESEARCH INC holds $1,431,360 across 2 Drug Manufacturers - Specialty & Generic names. AMPH ranks #2 (35.7% of the industry book) .

#	Ticker	Company	Shares	Value (USD)	Open
1	SUPN	Supernus Pharmaceuticals, Inc.	19,782	$920,060
2	AMPH	Amphastar Pharmaceuticals, Inc. This page	25,337	$511,300

15 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$511,300	25,337	+0.0%	Shares	Sole	2026-08-13
2026-03-31	$496,312	25,335	+67.1%	Shares	Sole	2026-05-14
2025-12-31	$406,011	15,161	-2.0%	Shares	Sole	2026-02-13
2025-09-30	$412,222	15,468	+3.8%	Shares	Sole	2025-11-13
2025-06-30	$342,058	14,898	+7.3%	Shares	Sole	2025-08-13
2025-03-31	$402,642	13,889	+0.3%	Shares	Sole	2025-05-14
2024-12-31	$514,361	13,853	+0.3%	Shares	Sole	2025-02-13
2024-09-30	$670,199	13,810	-3.2%	Shares	Sole	2024-11-14
2024-06-30	$570,800	14,270	+7.1%	Shares	Sole	2024-08-13
2024-03-31	$585,276	13,329	-6.0%	Shares	Sole	2024-05-14
2023-12-31	$876,661	14,174	-4.8%	Shares	Sole	2024-02-13
2023-09-30	$684,791	14,890	-3.4%	Shares	Sole	2023-11-13
2023-06-30	$885,440	15,407	+4.2%	Shares	Sole	2023-08-14
2023-03-31	$554,212	14,779	-2.4%	Shares	Sole	2023-05-12
2022-09-30	$425,658	15,148	—	Shares	Sole	2022-11-15
No filing history on record for this holder in this stock.