XBiotech Inc. (XBIT) Ownership
XBIT ownership summary
as of October 18, 2026- Institutions
- 6.7% of shares outstanding
- Insiders
- 36.87% of shares outstanding
- Shares outstanding
- 30.5M
- Float
- 22.8M shares available to trade
- Short interest
- 1.26% 328K shares short
- Days to cover
- 6.30 short interest down 5.5% vs prior month
- Institutions 6.73%
- Insiders 36.87%
- Other investors 56.40%
XBIT top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 1.05% | 321K | $680,830 | +28,042 (+9.6%) | June 30, 2026 |
| 2 | Geode Capital Management, LLC | 0.70% | 214K | $453,926 | −16,904 (−7.3%) | June 30, 2026 |
| 3 | Vanguard Capital Management, LLC | 0.66% | 200K | $424,386 | −789 (−0.4%) | June 30, 2026 |
| 4 | RBF LLC | 0.65% | 199K | $420,822 | — | June 30, 2026 |
| 5 | Morgan Stanley - Brokerage Accounts | 0.48% | 148K | $313,506 | −17,674 (−10.7%) | June 30, 2026 |
| 6 | Bridgeway Capital Management, LLC | 0.32% | 98K | $208,708 | — | June 30, 2026 |
| 7 | Vanguard Fiduciary Trust Co | 0.30% | 92K | $195,814 | +789 (+0.9%) | June 30, 2026 |
| 8 | Millennium Management LLC | 0.26% | 79K | $168,180 | −26,210 (−24.8%) | June 30, 2026 |
| 9 | State Street Corp | 0.24% | 73K | $154,773 | — | June 30, 2026 |
| 10 | Northern Trust Corp | 0.22% | 66K | $140,467 | −9,829 (−12.9%) | June 30, 2026 |
| 11 | Empowered Funds, LLC | 0.20% | 60K | $126,240 | — | June 30, 2026 |
| 12 | Renaissance Technologies Corp | 0.14% | 42K | $88,326 | +19,225 (+85.7%) | June 30, 2026 |
| 13 | Bank of New York Mellon Corp | 0.13% | 39K | $83,433 | — | June 30, 2026 |
| 14 | Dimensional Fund Advisors, Inc. | 0.12% | 36K | $76,432 | — | June 30, 2026 |
| 15 | Squarepoint Ops LLC | 0.11% | 35K | $73,685 | −6,457 (−15.7%) | June 30, 2026 |
| 16 | Qube Research & Technologies | 0.11% | 34K | $71,168 | +14,879 (+79.6%) | June 30, 2026 |
| 17 | GSA Capital Partners LLP | 0.10% | 31K | $64,986 | +30,654 (0.0%) | June 30, 2026 |
| 18 | Citadel Advisors Llc | 0.10% | 29K | $61,887 | +29,192 (0.0%) | June 30, 2026 |
| 19 | Connor Clark & Lunn Inv Mgmt Ltd | 0.09% | 28K | $59,239 | −720 (−2.5%) | June 30, 2026 |
| 20 | BNP Paribas Arbitrage, SA | 0.09% | 26K | $56,104 | −700 (−2.6%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 6 holders added 123K shares and 8 cut 79K.
XBIT top mutual fund and ETF holders
19 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Fidelity Extended Market Index | 0.31% | 94K | $199,770 | −506 (−0.5%) | August 31, 2026 |
| 2 | iShares Micro-Cap ETF | 0.25% | 75K | $158,941 | −517 (−0.7%) | September 30, 2026 |
| 3 | EA Bridgeway Omni Small-Cap Value ETF | 0.20% | 60K | $126,240 | — | September 30, 2026 |
| 4 | Bridgeway Ultra-Small Company | 0.13% | 39K | $82,468 | — | June 30, 2026 |
| 5 | Fidelity Total Market Index | 0.12% | 35K | $74,526 | — | August 31, 2026 |
| 6 | Fidelity Series Total Market Index | 0.09% | 28K | $58,315 | — | August 31, 2026 |
| 7 | Fidelity Nasdaq Composite Index | 0.05% | 15K | $32,828 | — | August 31, 2026 |
| 8 | Avantis US Small Cap Equity ETF | 0.04% | 13K | $28,043 | — | September 30, 2026 |
| 9 | Vanguard U.S. Eq Idx £ Acc | 0.02% | 7,009 | $14,859 | — | August 31, 2026 |
| 10 | Dimensional Global Core Equity USD Acc | 0.02% | 6,506 | $13,793 | — | August 31, 2026 |
| 11 | JNL/DFA US Small Cap A | 0.02% | 6,066 | $12,860 | — | June 30, 2026 |
| 12 | 1290 VT Micro Cap K | 0.02% | 5,290 | $11,215 | — | August 31, 2026 |
| 13 | Dimensional Global Small Coms USD Acc | 0.01% | 3,667 | $7,774 | — | August 31, 2026 |
| 14 | AST Small-Cap Equity Portfolio | 0.01% | 2,660 | $5,639 | — | August 31, 2026 |
| 15 | Dimensional International Core Eq Acc | 0.01% | 2,245 | $4,759 | — | August 31, 2026 |
| 16 | Dimensional World Equity GBP Acc | <0.01% | 1,332 | $2,824 | — | August 31, 2026 |
| 17 | Global Core Equity UCITS ETF USD Acc | <0.01% | 419 | $888 | — | September 30, 2026 |
| 18 | Avantis® U.S. Small Cap Value Instl | <0.01% | 282 | $598 | — | September 30, 2026 |
| 19 | BSF Systematic US Eq Abs Ret A2 USD | <0.01% | 200 | $424 | — | December 31, 2025 |
Funds report holdings monthly or quarterly; dates differ by fund.
XBIT insider transactions
latest 1| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2021-10-14 | John Simard | Sell | $12.90 | 21,125 | $272,512 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
XBIT shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns XBIT
Institutional investors own 6.7% of XBiotech's shares and insiders 36.87%. The largest holder is BlackRock Inc with 1.05% of the shares (321K), as of June 30, 2026. Among the top 20 institutions, 6 added shares and 8 reduced their stake in the latest filings. Short interest is 1.26% of the float, or 6.30 days of average trading volume. The share count fell 3.9% since 2014.
Related: XBIT key metrics. See the XBIT stock overview for the latest quote and news.
XBIT ownership FAQ
Who owns the most XBiotech stock?
The largest shareholders of XBiotech are BlackRock Inc (1.05%), Geode Capital Management, LLC (0.70%), Vanguard Capital Management, LLC (0.66%), RBF LLC (0.65%), Morgan Stanley - Brokerage Accounts (0.48%).
What percentage of XBiotech is owned by institutions?
Institutions hold 6.7% of XBiotech's shares outstanding; insiders hold 36.87%.
Which funds own XBiotech?
The largest fund holders of XBiotech are Fidelity Extended Market Index (0.31%), iShares Micro-Cap ETF (0.25%), EA Bridgeway Omni Small-Cap Value ETF (0.20%), Bridgeway Ultra-Small Company (0.13%), Fidelity Total Market Index (0.12%).
What is XBiotech's short interest?
328K shares of XBiotech were sold short, 1.26% of the float; at the average daily volume it would take 6.30 days to cover.
Are insiders buying or selling XBiotech?
Of the latest 1 reported insider transactions in XBiotech (since October 14, 2021), 0 were purchases and 1 were sales.
How many shares of XBiotech are outstanding?
XBiotech has 30.5M shares outstanding, of which 22.8M are in the public float.