# XBIOTECH INC (XBIT)

> Institutional ownership reported to the SEC as of Q2 2026, from Form 13F filings. Source: https://holderbook.com/stocks/XBIT/

- Reporting holders: 39
- Reported value: $5.2M
- Shares held by institutions: 2,083,378 of 30,487,731 outstanding
- Held through calls: 4.7%
- Held through puts: 2.2%

A 13F reports long US equity positions only. Shorts, bonds, foreign listings and cash are not visible here, and positions are disclosed up to 45 days after the quarter ends.

## Largest holders

| Manager | Value | Shares | Share of their book | Quarters held |
|---|---|---|---|---|
| [BlackRock, Inc.](https://holderbook.com/funds/2012383-blackrock-inc/) | $738.6K | 321,146 | 0.0% | 8 |
| [GEODE CAPITAL MANAGEMENT, LLC](https://holderbook.com/funds/1214717-geode-capital-management-llc/) | $492.8K | 214,116 | 0.0% | 31 |
| [VANGUARD CAPITAL MANAGEMENT LLC](https://holderbook.com/funds/2100119-vanguard-capital-management-llc/) | $460.4K | 200,182 | 0.0% | 2 |
| [RBF Capital, LLC](https://holderbook.com/funds/1134621-rbf-capital-llc/) | $456.6K | 198,501 | 0.0% | 5 |
| [MORGAN STANLEY](https://holderbook.com/funds/895421-morgan-stanley/) | $340.1K | 147,880 | 0.0% | 28 |
| [STATE STREET CORP](https://holderbook.com/funds/93751-state-street-corp/) | $335.8K | 146,012 | 0.0% | 31 |
| [BRIDGEWAY CAPITAL MANAGEMENT, LLC](https://holderbook.com/funds/1107261-bridgeway-capital-management-llc/) | $226.4K | 98,447 | 0.0% | 17 |
| [VANGUARD FIDUCIARY TRUST CO](https://holderbook.com/funds/933478-vanguard-fiduciary-trust-co/) | $212.4K | 92,365 | 0.0% | 2 |
| [JANE STREET GROUP, LLC](https://holderbook.com/funds/1595888-jane-street-group-llc/) | $198.2K | 11,476 | 0.0% | 5 |
| [MILLENNIUM MANAGEMENT LLC](https://holderbook.com/funds/1273087-millennium-management-llc/) | $182.5K | 79,330 | 0.0% | 20 |
| [SUSQUEHANNA INTERNATIONAL GROUP, LLP](https://holderbook.com/funds/1446194-susquehanna-international-group-llp/) | $170.0K | 0 | 0.0% | 2 |
| [NORTHERN TRUST CORP](https://holderbook.com/funds/73124-northern-trust-corp/) | $152.4K | 66,258 | 0.0% | 31 |
| [Empowered Funds, LLC](https://holderbook.com/funds/1592828-empowered-funds-llc/) | $137.0K | 59,547 | 0.0% | 13 |
| [CITADEL ADVISORS LLC](https://holderbook.com/funds/1423053-citadel-advisors-llc/) | $134.3K | 58,384 | 0.0% | 1 |
| [RENAISSANCE TECHNOLOGIES LLC](https://holderbook.com/funds/1037389-renaissance-technologies-llc/) | $95.8K | 41,663 | 0.0% | 2 |
| [Bank of New York Mellon Corp](https://holderbook.com/funds/1390777-bank-of-new-york-mellon-corp/) | $90.5K | 39,355 | 0.0% | 31 |
| [DIMENSIONAL FUND ADVISORS LP](https://holderbook.com/funds/354204-dimensional-fund-advisors-lp/) | $83.0K | 36,053 | 0.0% | 31 |
| [Squarepoint Ops LLC](https://holderbook.com/funds/1642575-squarepoint-ops-llc/) | $79.9K | 34,757 | 0.0% | 5 |
| [Qube Research & Technologies Ltd](https://holderbook.com/funds/1729829-qube-research-technologies-ltd/) | $77.2K | 33,570 | 0.0% | 5 |
| [GSA CAPITAL PARTNERS LLP](https://holderbook.com/funds/1362033-gsa-capital-partners-llp/) | $71.0K | 30,654 | 0.0% | 1 |
| [Connor, Clark & Lunn Investment Management Ltd.](https://holderbook.com/funds/1596800-connor-clark-lunn-investment-management-ltd/) | $64.3K | 27,943 | 0.0% | 18 |
| [BNP PARIBAS FINANCIAL MARKETS](https://holderbook.com/funds/1166588-bnp-paribas-financial-markets/) | $60.9K | 26,464 | 0.0% | 31 |
| [NATIONAL BANK OF CANADA /FI/](https://holderbook.com/funds/926171-national-bank-of-canada-fi/) | $57.5K | 25,000 | 0.0% | 11 |
| [BANK OF AMERICA CORP /DE/](https://holderbook.com/funds/70858-bank-of-america-corp-de/) | $54.7K | 23,789 | 0.0% | 31 |
| [AMERICAN CENTURY COMPANIES INC](https://holderbook.com/funds/748054-american-century-companies-inc/) | $42.3K | 18,381 | 0.0% | 9 |

## Quarter by quarter

| Quarter | Holders | Reported value |
|---|---|---|
| Q2 2026 | 39 | $5.2M |
| Q1 2026 | 40 | $4.9M |
| Q4 2025 | 40 | $6.0M |
| Q3 2025 | 47 | $7.8M |
| Q2 2025 | 53 | $10.2M |
| Q1 2025 | 54 | $14.5M |
| Q4 2024 | 53 | $18.7M |
| Q3 2024 | 50 | $37.6M |
| Q2 2024 | 46 | $23.3M |
| Q1 2024 | 45 | $35.0M |
| Q4 2023 | 39 | $14.2M |
| Q3 2023 | 37 | $14.0M |