13F Insight
DOSSIER · 13F Holders · Q1 2026BellwetherCompounder
PHAT

Phathom Pharmaceuticals Inc

180 institutions still hold Phathom Pharmaceuticals Inc as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 71722w107·180 13F holders·last filed Mar 31, 2026
Market cap
—
▲ 5.7%
vs prior quarter
13F value held
$621M
58.0% inst. owned
of float
Holders
180
+50 QoQ
filers reporting
Activity
+51 / −97
+782 added · −763 reduced
this quarter
Concentration
22.32%
Frazier Life Sciences Management, L.P. #1
top holder share
AI Holders Summary · Q1 2026

180 institutions reported PHAT in Q1 2026. Frazier Life Sciences Management, L.P. leads at 22.3% of the visible book. +50 net new institutions vs prior quarter — accumulation reading.

Top holders

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

#HolderValueShares% port.Quarter
01
Frazier Life Sciences Management, L.P.
CIK 0001892134
$139M12.5M3.56%Q1 202602
Medicxi Ventures Management (Jersey) Ltd
CIK 0001715579
$83M7.5M8.45%Q1 202603
Invesco Ltd.
CIK 0000914208
$48M4.3M0.01%Q1 202604
BlackRock, Inc.
CIK 0002012383
$45M4.1M0.00%Q1 202605
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
$45M4.0M0.02%Q1 202606
Carlyle Group Inc.
CIK 0001527166
$39M3.5M0.37%Q1 202607
683 Capital Management, LLC
CIK 0001404574
$30M1.8M1.29%Q4 202508
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$29M2.6M0.00%Q1 202609
NEA Management Company, LLC
CIK 0001512848
$22M2.0M1.24%Q1 202610
Ensign Peak Advisors, Inc
CIK 0001454984
$18M1.6M0.03%Q1 202611
Catalys Pacific, LLC
CIK 0002011385
$17M1.5M7.19%Q1 202612
STATE STREET CORP
CIK 0000093751
$15M1.4M0.00%Q1 202613
WASATCH ADVISORS LP
CIK 0000814133
$15M1.3M0.10%Q1 202614
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$15M1.3M0.00%Q1 202615
Delaware Management Holdings, Inc.
CIK 0000921739
$13M1.2M0.02%Q1 202616
SummitTX Capital, L.P.
CIK 0002052310
$11M996K0.35%Q1 202617
FRANKLIN RESOURCES INC
CIK 0000038777
$11M995K0.00%Q1 202618
PERCEPTIVE ADVISORS LLC
CIK 0001224962
$10M925K0.20%Q1 202619
Propel Bio Management, LLC
CIK 0001969764
$9M841K5.90%Q1 202620
Vanguard Portfolio Management
CIK 0002100121
$7M666K0.00%Q1 2026
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