13F Insight
DOSSIER · 13F Holders · Q2 2026
AMPH 2 03/15/29

AMPHASTAR PHARMACEUTICALS IN

41 institutions still hold AMPHASTAR PHARMACEUTICALS IN as of Q2 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 03209RAB9·41 13F holders·last filed Jun 30, 2026
Market cap
—
13F value held
$335M
visible holders
Holders
41
filers reporting
Concentration
25.42%
Context Capital Management, LLC #1
top holder share
AI Holders Summary · Q2 2026

41 institutions reported AMPH 2 03/15/29 in Q2 2026. Context Capital Management, LLC leads at 25.4% of the visible book.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
Context Capital Management, LLC
CIK 0001301396
$85M93.6M1.66%Q2 202602
LINDEN ADVISORS LP
CIK 0001279396
$85M93.6M0.47%Q1 202603
CAMDEN ASSET MANAGEMENT L P /CA
CIK 0000903944
$38M41.8M1.28%Q1 202604
OAKTREE CAPITAL MANAGEMENT LP
CIK 0000949509
$34M38.0M0.53%Q1 202605
Wellesley Asset Management
CIK 0001533551
$24M26.0M2.48%Q1 202606
Empyrean Capital Partners, LP
CIK 0001317195
$18M20.3M0.59%Q1 202607
Calamos Advisors LLC
CIK 0001316507
$9M10.0M0.03%Q1 202608
MORGAN STANLEY
CIK 0000895421
$6M6.6M0.00%Q1 202609
Russell Investments Group, Ltd.
CIK 0001692234
$5M5.7M0.01%Q1 202610
BlackRock, Inc.
CIK 0002012383
$5M5.5M0.00%Q1 202611
Chicago Capital Management, LLC
CIK 0001580162
$5M5K4.43%Q2 202612
SILVERBACK ASSET MANAGEMENT LLC
CIK 0001278960
$5M5.1M0.66%Q1 202613
ADVENT CAPITAL MANAGEMENT /DE/
CIK 0001097278
$4M4.1M0.10%Q1 202614
FMR LLC
CIK 0000315066
$3M3.8M0.00%Q1 202615
CITIGROUP INC
CIK 0000831001
$3M3.5M0.00%Q1 202616
Pinnacle Holdings, LLC
CIK 0001411784
$2M2.1M0.60%Q1 202617
Cutler Capital Management, LLC
CIK 0001353098
$2M1.9M0.47%Q1 202618
Universal- Beteiligungs- und Servicegesellschaft mbH
CIK 0002057170
$1M1.2M0.00%Q1 202619
ROYAL BANK OF CANADA
CIK 0001000275
$1M1.1M0.00%Q1 202620
ZAZOVE ASSOCIATES LLC
CIK 0001009012
$581K640K0.05%Q2 2026
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