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XBIT · NASDAQ · Biotechnology

XBiotech (XBIT)

Develops human-derived monoclonal antibodies through integrated Austin research, clinical development and manufacturing.

$2.20
At close−0.02 (−0.90%)
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Breakdown13F · 13D/G · Form 4

Institutions38 holders · as of Mar 31, 20266.54%1.99M shares
Insiders6 holders · as of Jan 23, 202646.28%14.11M shares
Otherremainder47.18%14.39M shares

30.49M company shares as of Sep 3, 2026 · institutions as of Mar 31, 2026 · holders as of their latest filing

Top shareholders13F · 13D/G · Form 4

HolderStakeSharesEvidence
John Simard1Insiderdirector, 10 percent owner, officer: Chief Executive Officer
18.76%5.72M13Gfiled Jan 23, 2026 ↗
Thomas GutInsider10 percent owner
12.84%3.91M13Gfiled Feb 10, 2023 ↗
W. Thorpe MckenzieInsiderdirector, 10 percent owner
9.86%3.01M13Gfiled Jan 23, 2026 ↗
Lombard International Assurance S.A.Insider
3.65%1.11M13Gfiled Jan 12, 2023 ↗
BlackRock, Inc.Institution
0.96%293,10413Fas of Mar 31, 2026
Thomas Martin KuendigInsiderdirector
0.82%250,000Form 4filed Sep 30, 2025 ↗
Geode Capital Management, LLCInstitution
0.76%231,02013Fas of Mar 31, 2026
Vanguard Capital Management LLCInstitution
0.66%200,97113Fas of Mar 31, 2026
RBF Capital, LLCInstitution
0.65%198,50113Fas of Mar 31, 2026
Morgan StanleyInstitution
0.54%165,55413Fas of Mar 31, 2026
Millennium Management LLCInstitution
0.35%105,54013Fas of Mar 31, 2026
Craig Evan RademakerInsiderdirector
0.34%104,237Form 4filed Sep 16, 2025 ↗
Bridgeway Capital Management, LLCInstitution
0.32%98,44713Fas of Mar 31, 2026
Vanguard Fiduciary Trust CoInstitution
0.30%91,57613Fas of Mar 31, 2026
Northern Trust CorpInstitution
0.25%76,08713Fas of Mar 31, 2026
State Street CorpInstitution
0.24%73,00613Fas of Mar 31, 2026
Jane Street Group, LLCInstitution
0.20%60,10013Fas of Mar 31, 2026
Empowered Funds, LLCInstitution
0.20%59,54713Fas of Mar 31, 2026
Squarepoint Ops LLCInstitution
0.14%41,21413Fas of Mar 31, 2026
Bank of New York Mellon CorpInstitution
0.13%39,35513Fas of Mar 31, 2026
Bank of America Corp /DE/Institution
0.12%36,68913Fas of Mar 31, 2026
Dimensional Fund Advisors LPInstitution
0.12%36,05313Fas of Mar 31, 2026
Connor, Clark & Lunn Investment Management Ltd.Institution
0.09%28,66313Fas of Mar 31, 2026
BNP Paribas Arbitrage, SNCInstitution
0.09%27,16413Fas of Mar 31, 2026
National Bank of Canada /FI/Institution
0.08%25,00013Fas of Mar 31, 2026
  1. John Simard's transaction reports restate only vehicles that traded; the 2026 ownership statement (5.72M) is used instead.

13F — a manager's quarterly holdings · 13D/13G — an ownership statement filed at 5% or more · Form 4 — an insider's transaction report

Institutions13F, as of Mar 31, 2026

38 holders · 1.99M shares · 9 new positions · 16 increased · 11 reduced · 11 closed

HolderShares% outstandingChg q/qFiled
BlackRock, Inc.293.1K0.96%+4.5KMay 13, 2026
Geode Capital Management, LLC231.0K0.76%+9.9KMay 15, 2026
Vanguard Capital Management LLC201.0K0.66%+201.0KnewMay 15, 2026
RBF Capital, LLC198.5K0.65%0May 18, 2026
Morgan Stanley165.6K0.54%+2.1KMay 15, 2026
Millennium Management LLC105.5K0.35%−29.9KMay 15, 2026
Bridgeway Capital Management, LLC98.4K0.32%+8.9KMay 15, 2026
Vanguard Fiduciary Trust Co91.6K0.30%+91.6KnewMay 8, 2026

Ownership statements13D/G · 5% or more, as filed

Holder% of classSharesFormFiled
John Simard17.70%5.72M13GJan 23, 2026 ↗
W. Thorpe McKenzie9.76%3.01M13GJan 23, 2026 ↗

Insider tradesForm 4

Latest trades

No open-market trades in the last 12 months.

CongressHouse and Senate disclosures

Not reported.