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ADVISORY RESEARCH INC

Position in AMPH — Amphastar Pharmaceuticals, Inc.

CIK 902584 CHICAGO, IL

Position in AMPH

as of Mar 31, 2026 · filed May 14, 2026
Position Value
$496,312
+$90,301 QoQ
Shares Held
25,335
+67.1% QoQ
Ownership
0.057%
of shares outstanding
% of Portfolio
0.07%
of 13F equity value
Holder Rank
not a current holder
Holding Since
Sep 2022
14 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

ADVISORY RESEARCH INC holds $1,509,177 across 2 Drug Manufacturers - Specialty & Generic names. AMPH ranks #2 (32.9% of the industry book) .

# Ticker Company Shares Value (USD) Open
2 AMPH
Amphastar Pharmaceuticals, Inc.
This page
25,335 $496,312

All Filings in AMPH

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14 filing rows on record
Report Date Value (USD) Shares
2026-03-31 $496,312 25,335
2025-12-31 $406,011 15,161
2025-09-30 $412,222 15,468
2025-06-30 $342,058 14,898
2025-03-31 $402,642 13,889
2024-12-31 $514,361 13,853
2024-09-30 $670,199 13,810
2024-06-30 $570,800 14,270
2024-03-31 $585,276 13,329
2023-12-31 $876,661 14,174
2023-09-30 $684,791 14,890
2023-06-30 $885,440 15,407
2023-03-31 $554,212 14,779
2022-09-30 $425,658 15,148