13F Insight
DOSSIER · 13F Holders · Q1 2026High-convictionMulti-bagger
XFOR

X4 PHARMACEUTICALS INC

84 institutions still hold X4 PHARMACEUTICALS INC as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 98420X202·84 13F holders·last filed Mar 31, 2026
Market cap
—
▼ 3.4%
vs prior quarter
13F value held
$364M
61.0% inst. owned
of float
Holders
84
-92 QoQ
filers reporting
Activity
+50 / −19
+801 added · −787 reduced
this quarter
Concentration
10.73%
MORGAN STANLEY #1
top holder share
AI Holders Summary · Q1 2026

84 institutions reported XFOR in Q1 2026. MORGAN STANLEY leads at 10.7% of the visible book. -92 net institutions QoQ — distribution reading.

Top holders

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

#HolderValueShares% port.Quarter
01
MORGAN STANLEY
CIK 0000895421
$39M9.5M0.00%Q1 202602
Empery Asset Management, LP
CIK 0001469336
$37M8.9M44.50%Q1 202603
FMR LLC
CIK 0000315066
$33M8.1M0.00%Q1 202604
Bain Capital Life Sciences Investors, LLC
CIK 0001703031
$33M8.0M2.97%Q1 202605
Kalehua Capital Management LLC
CIK 0002106181
$31M7.4M11.83%Q1 202606
PERCEPTIVE ADVISORS LLC
CIK 0001224962
$28M6.7M0.54%Q1 202607
Saturn V Capital Management LP
CIK 0001964437
$27M6.5M4.83%Q1 202608
Deep Track Capital, LP
CIK 0001856083
$26M6.3M0.43%Q1 202609
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$14M3.5M0.00%Q1 202610
BRAIDWELL LP
CIK 0001920938
$14M3.3M0.45%Q1 202611
Rosalind Advisors, Inc.
CIK 0001622627
$13M3.2M5.33%Q1 202612
Blackstone Inc.
CIK 0001393818
$11M2.7M0.04%Q1 202613
Trails Edge Capital Partners, LP
CIK 0002077247
$10M2.6M2.54%Q4 202514
Nantahala Capital Management, LLC
CIK 0001472322
$10M2.4M0.37%Q1 202615
BVF INC/IL
CIK 0001056807
$9M2.2M0.30%Q4 202516
Samsara BioCapital, LLC
CIK 0001744967
$8M1.8M0.74%Q1 202617
STEMPOINT CAPITAL LP
CIK 0001952142
$7M1.7M0.68%Q1 202618
BlackRock, Inc.
CIK 0002012383
$5M1.2M0.00%Q1 202619
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
$5M1.2M0.00%Q1 202620
Woodline Partners LP
CIK 0001784547
$4M1.0M0.02%Q1 2026
Page 1 of 5
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