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Disclosery

XFOR X4 PHARMACEUTICALS INC

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COMMON STOCK (common), issuer CIK 1501697

78 managers (82 13F filers) reported a position in XFOR shares at 2026-03-31, 90,437,755 shares in all. 15 filers opened a position and 10 filers sold out during the quarter.

Managers
78
13F filers
82
New
15
Added
22
Reduced
22
Sold out
10
Shares held by filers
90,437,755

Shares held by filers adds up every 13F filer's report, so a share reported by a parent and by its subsidiary counts twice (H9). Managers counts each filer group once.

13D and 13G filers

Each filer's latest stake. The shares are the aggregate the reporting persons state, which can include entities that file no 13F.

Insider trades

No Form 4 transaction on this security in the data.

13F holders, Q1 2026

Filers in the available 13F reports with a share position at 2026-03-31, filer groups collapsed to one row (method), largest first. Options and principal amounts are left out. A group row states no % of portfolio, since each member reports its own portfolio: the members' percents are listed under it. A value about 1,000 times or 1/1,000 of the price other filers imply is shown as filed but neither ranks the row nor enters a sum.

HolderSharesValue% of portfolioChangeSource
MORGAN STANLEYin group MORGAN STANLEY9,466,992$39.1M<0.01%+1,258,97713F-HRTimelineGroup
Empery Asset Management, LP8,944,118$36.9M44.5%-6,98713F-HRTimeline
FMR LLCin group FMR LLC8,103,400$33.5M<0.01%-395,70013F-HRTimelineGroup
Bain Capital Life Sciences Investors, L…in group Bain Capital Life Sciences In…7,967,454$32.9M2.97%013F-HRTimelineGroup
PERCEPTIVE ADVISORS LLCin group PERCEPTIVE ADVISORS LLC6,737,648$27.8M0.55%+423,19613F-HR/ATimelineGroup
Saturn V Capital Management LP6,456,646$26.7M4.83%+656,11613F-HRTimeline
Deep Track Capital, LP6,339,535$26.2M0.54%+1,325,87413F-HRTimeline
VANGUARD GROUP INCgroup of 4 filers holding4,022,847$16.6MnewTimeline
Kalehua Capital Management LLC3,722,840$15.4M10.88%013F-HR/ATimeline
BRAIDWELL LP3,272,954$13.5M0.45%-95,95013F-HRTimeline
Rosalind Advisors, Inc.3,214,766$13.3M5.44%+608,84613F-HRTimeline
Blackstone Inc.in group Blackstone Inc.2,681,922$11.1M0.04%013F-HRTimelineGroupThe filing omitted confidential holdings, a later amendment may add them.
Trails Edge Capital Partners, LP2,571,478$10.6M2.5%013F-HRTimeline
Nantahala Capital Management, LLCin group Nantahala Capital Management,…2,449,468$10.1M0.63%013F-HRTimelineGroup
BVF INC/ILin group BVF INC/IL2,233,742$9.23M0.29%013F-HRTimelineGroup
SAMSARA BIOCAPITAL, LLC1,832,566$7.57M0.74%-127,43413F-HRTimeline
BlackRock, Inc.in group BlackRock, Inc.1,211,794$5M<0.01%-15,01413F-HRTimelineGroup
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC1,210,514$5M<0.01%+1,154,53613F-HRTimelineGroup
Woodline Partners LP1,001,095$4.13M0.02%+24013F-HR/ATimeline
SUSQUEHANNA INTERNATIONAL GROUP, LLPgroup of 2 filers holding958,821$3.96M+893,427Timeline
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC939,726$3.88M<0.01%-72113F-HRTimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC882,134$3.64M<0.01%+50,24413F-HRTimelineGroup
STEMPOINT CAPITAL LP850,742$3.51M0.68%-47,72313F-HR/ATimeline
STATE STREET CORPin group STATE STREET CORP403,534$1.67M<0.01%+205,30013F-HRTimelineGroup
MARSHALL WACE, LLPin group MARSHALL WACE, LLP336,834$1.39M<0.01%+256,37813F-HRTimelineGroup
Stonepine Capital Management, LLC335,309$1.38M1.22%-258,26413F-HRTimeline
Venrock Adviser, LLC330,525$1.37M0.05%new13F-HRTimeline
UBS Group AGin group UBS Group AG267,340$1.1M<0.01%+263,21113F-HRTimelineGroup
Qube Research & Technologies Ltd218,954$904K<0.01%+151,20713F-HRTimeline
NORTHERN TRUST CORPin group NORTHERN TRUST CORP178,235$736K<0.01%013F-HRTimelineGroup
Pale Fire Capital SEin group Pale Fire Capital167,590$692K0.06%013F-HRTimelineGroup
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/150,676$622K<0.01%+114,91513F-HRTimelineGroup
Affinity Asset Advisors, LLC145,000$599K0.04%013F-HRTimeline
Palumbo Wealth Management LLC131,014$541K0.13%+17,65713F-HRTimeline
Brevan Howard Capital Management LPin group Brevan Howard Capital Managem…127,321$526K0.01%new13F-HRTimelineGroup
Dynamic Technology Lab Private Ltd36,221$385K0.06%new13F-HRTimeline
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co66,749$276K<0.01%-3913F-HRTimelineGroup
OMERS ADMINISTRATION Corp57,300$237K<0.01%-51,90013F-HRTimeline
Hudson Bay Capital Management LPin group Hudson Bay Capital Management…50,287$208K<0.01%+18,04813F-HRTimelineGroup
Catalyst Funds Management Pty Ltd47,383$196K0.03%new13F-HRTimeline
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC37,143$153K<0.01%-54,27013F-HRTimelineGroup
CITIGROUP INCin group CITIGROUP INC35,765$148K<0.01%+3,43313F-HRTimelineGroup
Diametric Capital, LP28,973$120K0.03%new13F-HRTimeline
STIFEL FINANCIAL CORPin group STIFEL FINANCIAL CORP21,789$90K<0.01%+1,29313F-HRTimelineGroup
Invesco Ltd.in group Invesco Ltd.19,968$82.5K<0.01%new13F-HRTimelineGroup
Schonfeld Strategic Advisors LLC19,514$80.6K<0.01%new13F-HRTimeline
Jefferies Financial Group Inc.in group Jefferies Financial Group Inc.19,474$80.4K<0.01%-6,64413F-HRTimelineGroup
CAXTON CORP15,557$64.2K1.6%013F-HRTimelineThe filing omitted confidential holdings, a later amendment may add them.
ExodusPoint Capital Management, LP14,703$60.7K<0.01%-64,36913F-HRTimeline
TWO SIGMA INVESTMENTS, LPin group TWO SIGMA INVESTMENTS, LP13,868$57.3K<0.01%-3,37813F-HRTimelineGroup
Creative Planningin group Creative Planning13,819$57.1K<0.01%-2,60813F-HRTimelineGroup
Virtu Financial LLCin group Virtu Financial LLC12,730$53K<0.01%-9,75913F-HRTimelineGroup
Jump Financial, LLCin group Jump Financial, LLC12,317$50.9K<0.01%new13F-HRTimelineGroup
SummitTX Capital, L.P.11,200$46.3K<0.01%new13F-HRTimeline
WINTON GROUP Ltdin group WINTON GROUP Ltd10,600$43.8K<0.01%new13F-HRTimelineGroup
Indivisible Partners10,000$37K<0.01%013F-HRTimeline
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS4,756$19.6K<0.01%+4,24513F-HRTimelineGroup
BARCLAYS PLCin group BARCLAYS PLC2,814$11.6K<0.01%-54,68613F-HRTimelineGroup
SIGNATUREFD, LLC1,996$8.24K<0.01%-75813F-HRTimeline
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…1,759$7.26K<0.01%013F-HRTimelineGroup
State of Wyoming1,065$4.4K<0.01%new13F-HRTimeline
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…729$3.01K<0.01%013F-HRTimelineGroup
ACADIAN ASSET MANAGEMENT LLCin group ACADIAN ASSET MANAGEMENT LLC802$3K<0.01%new13F-HRTimelineGroup
GROUP ONE TRADING LLC712$2.94K<0.01%-3,28613F-HRTimeline
Bleichroeder LP595$2.46K<0.01%013F-HRTimeline
Farther Finance Advisors, LLC331$1.44K<0.01%013F-HRTimeline
Allworth Financial LP310$1.28K<0.01%-40513F-HRTimeline
Blue Trust, Inc.284$1.17K<0.01%013F-HRTimeline
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…180$743<0.01%-10,26613F-HRTimelineGroup
QUADRANT CAPITAL GROUP LLC128$529<0.01%new13F-HR/ATimeline
Parallel Advisors, LLC116$479<0.01%new13F-HR/ATimeline
SBI Securities Co., Ltd.54$223<0.01%+413F-HRTimeline
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP38$154<0.01%013F-HRTimelineGroup
Rockefeller Capital Management L.P.in group Rockefeller Capital Managemen…33$136<0.01%013F-HRTimelineGroup
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO33$132<0.01%-4,54813F-HR/ATimelineGroup
HighMark Wealth Management LLC6$24<0.01%013F-HRTimeline
NORTHWESTERN MUTUAL WEALTH MANAGEMENT COin group NORTHWESTERN MUTUAL INVESTMEN…5$21<0.01%013F-HRTimelineGroup
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA115$00%+1113F-HRTimelineGroupValue filed as zero, left out of ratios.

Events

  • FMR LLC and 1 other reporting person reported 4,558,616 XFOR shares, 4.6% of the class, as of 2026-09-30, in a 13G/A filed 2026-10-07. 0000315066-26-002326

    Accepted , ingested