SummerHaven Investment Management, LLC

Position in AMPH — Amphastar Pharmaceuticals, Inc.

CIK 1846436 STAMFORD, CT

Back to AMPH Full portfolio

Position in AMPH

as of Mar 31, 2026 · filed Apr 24, 2026 Compact

Position Value

$639,280

-$383,716 QoQ

Shares Held

32,633

-14.6% QoQ

Ownership

0.074%

of shares outstanding

% of Portfolio

0.40%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Sep 2025

3 quarters on record

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

SummerHaven Investment Management, LLC holds $1,932,303 across 3 Drug Manufacturers - Specialty & Generic names. AMPH ranks #2 (33.1% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	COLL	Collegium Pharmaceutical, Inc	22,756	$752,540
2	AMPH	Amphastar Pharmaceuticals, Inc. This page	32,633	$639,280
3	SIGA	Siga Technologies Inc	101,025	$540,483

All Filings in AMPH

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3 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$639,280	32,633	-14.6%	Shares	Sole	2026-04-24
2025-12-31	$1,022,996	38,200	0.0%	Shares	Sole	2026-02-03
2025-09-30	$1,018,030	38,200	—	Shares	Sole	2025-11-03
No filing history on record for this holder in this stock.