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

AMPHASTAR PHARMACEUTICALS IN

39 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 03209RAB9·39 13F holders·last filed Jun 30, 2026
Market cap
—
13F value held
$321M
visible holders
Holders
39
filers reporting
Concentration
26.54%
Context Capital Management, LLC #1
top holder share
AI Holders Summary · Q2 2026

39 institutions reported AMPH 2 03/15/29 in Q2 2026. Context Capital Management, LLC leads at 26.5% 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
DeepCurrents Investment Group LLC
CIK 0001754535
$41M45.0M1.24%Q2 202603
OAKTREE CAPITAL MANAGEMENT LP
CIK 0000949509
$37M40.9M0.52%Q2 202604
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
$31M34.0M0.01%Q2 202605
Empyrean Capital Partners, LP
CIK 0001317195
$22M24.3M0.73%Q2 202606
Nuveen, LLC
CIK 0001871926
$20M21.6M0.00%Q2 202607
CAMDEN ASSET MANAGEMENT L P /CA
CIK 0000903944
$14M15.3M0.41%Q2 202608
Fort Baker Capital Management LP
CIK 0001688382
$11M12.5M0.84%Q2 202609
CAPSTONE INVESTMENT ADVISORS, LLC
CIK 0001426196
$9M10.1M0.02%Q2 202610
Wellesley Asset Management
CIK 0001533551
$8M8.5M0.70%Q2 202611
KIM, LLC
CIK 0001888968
$7M7.5M0.68%Q2 202612
BlackRock, Inc.
CIK 0002012383
$6M6.8M0.00%Q2 202613
Russell Investments Group, Ltd.
CIK 0001692234
$5M6.0M0.00%Q2 202614
Nykredit A/S
CIK 0001847328
$5M5.5M0.02%Q2 202615
Chicago Capital Management, LLC
CIK 0001580162
$5M5K4.43%Q2 202616
Calamos Advisors LLC
CIK 0001316507
$5M5.0M0.02%Q2 202617
ADVENT CAPITAL MANAGEMENT /DE/
CIK 0001097278
$4M3.9M0.08%Q2 202618
FMR LLC
CIK 0000315066
$3M3.8M0.00%Q2 202619
Pinnacle Holdings, LLC
CIK 0001411784
$2M2.0M0.56%Q2 202620
Universal- Beteiligungs- und Servicegesellschaft mbH
CIK 0002057170
$1M1.2M0.00%Q2 2026
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