XBiotech Inc.
XBiotech Inc. (XBIT) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · XBIT · as of Sep 30, 2025
Ownership Breakdown
46
Institutional Holders
▼ 7 vs Q2
$7.81M
Total Inst. Value
▼ $2.34M vs Q2
30.49M
Shares Outstanding
freeFloat 63.39%
2.94M
13F Shares Held
▼ 480,841 vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
XBIT largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
VANGUARD GROUP INC pharmaceutical preparations | 819.2K | 2.69% | 2.69% | $2.18B | Nov 7, 2025 | ▼ 126.2K |
MILLENNIUM MANAGEMENT LLC pharmaceutical preparations | 416.3K | 1.37% | 1.37% | $1.11B | Nov 14, 2025 | ▼ 135.0K |
BLACKROCK, INC. pharmaceutical preparations | 302.4K | 99.18% | 99.18% | $804.35M | Nov 12, 2025 | ▼ 71.2K |
GEODE CAPITAL MANAGEMENT, LLC pharmaceutical preparations | 221.9K | 72.77% | 72.77% | $590.47M | Nov 12, 2025 | ▲ 1.2K |
RBF CAPITAL, LLC pharmaceutical preparations | 200.0K | 65.60% | 65.60% | $532.00M | Nov 14, 2025 | — held |
MORGAN STANLEY pharmaceutical preparations | 121.5K | 39.84% | 39.84% | $323.06M | May 27, 2026 | ▲ 35.6K |
NORTHERN TRUST CORP pharmaceutical preparations | 81.6K | 26.77% | 26.77% | $217.12M | Nov 14, 2025 | ▼ 11.5K |
STATE STREET CORP pharmaceutical preparations | 67.3K | 22.08% | 22.08% | $179.03M | Nov 14, 2025 | ▼ 1.2K |
DIMENSIONAL FUND ADVISORS LP pharmaceutical preparations | 64.3K | 21.10% | 21.10% | $171.15M | Nov 12, 2025 | ▼ 6.6K |
SQUAREPOINT OPS LLC pharmaceutical preparations | 62.2K | 20.39% | 20.39% | $165.34M | Nov 14, 2025 | ▲ 22.4K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
11
Increased
+131.6K shares4
New Positions
first time holders20
Decreased
−504.1K shares4
Sold Out
fully exitedNet shares change (top 50)
372.5K
+131.6K / −504.1K
Net new holders
-9
4 new / 4 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
XBIT insider trading · insider activity
Source: SEC Form 4
Insiders have been net buyers of shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
1
Buy transactions
1
Sell transactions
1.00
Buy/Sell ratio
$2M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Rademaker Craig Evan director | Oct 1, 2025 | Award | 92,104 | $2.64 | $243.2K | 92.1K | Form 4 ↗ |
Soffer David Spencer director | Oct 1, 2025 | Award | 51,000 | $2.64 | $134.6K | 51.0K | Form 4 ↗ |
Kuendig Thomas Martin director | Oct 1, 2025 | Award | 79,115 | $2.64 | $208.9K | 79.1K | Form 4 ↗ |
Troy Tevi David director | Oct 1, 2025 | Award | 56,000 | $2.64 | $147.8K | 56.0K | Form 4 ↗ |
SIMARD JOHN Chief Executive Officer | Mar 17, 2025 | Award | 1,026,228 | $3.52 | $3.61M | 1.90M | Form 4 ↗ |
SIMARD JOHN Chief Executive Officer | Jan 31, 2025 | J-Other | 2,470,355 | $4.05 | $10.00M | 870.4K | Form 4 ↗ |
MCKENZIE W THORPE
| Jun 20, 2024 | Award | 37,500 | $5.12 | $192.0K | 37.5K | Form 4 ↗ |
Waldin Jan-Paul director | Jun 20, 2024 | Award | 37,500 | $5.12 | $192.0K | 37.5K | Form 4 ↗ |
MacAdam Donald H. director | Jun 20, 2024 | Award | 37,500 | $5.12 | $192.0K | 37.5K | Form 4 ↗ |
Libby Peter director | Jun 20, 2024 | Award | 37,500 | $5.12 | $192.0K | 37.5K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
XBiotech Inc. (XBIT) is primarily owned by institutional investors, who hold approximately 9.6% of total shares outstanding. Company insiders own approximately 36.61%, while retail and public investors account for the remaining 53.76%.
The largest institutional shareholder of XBiotech Inc. is VANGUARD GROUP INC, holding approximately 819,239 shares — equal to 2.69% of outstanding shares — as of September 30, 2025.
A total of 46 institutional investors currently hold XBIT stock, with a combined institutional value of approximately $7,807,438 as of the most recent 13F filing period.
Frequently asked questions
XBIT ownershipXBiotech Inc. (XBIT) is primarily owned by institutional investors, who hold approximately 9.6% of shares. The largest shareholder is VANGUARD GROUP INC with a 2.69% stake. Company insiders hold 36.61%. Data sourced from SEC Form 13F as of September 30, 2025.