XBIT
XBiotech Inc.Company with tickers: XBIT
CIK
1626878
CUSIP
98400H102
Shares Outstanding
30,487,731
13F Activity (30d)
38 filings
35 filers
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Holders: 38
Total Value: $4,732,602
Total Shares: 2,013,883
Institutional Ownership Trend
Holder Concentration
Across 38 13F filers · Δ vs Dec 31, 2025Top Holder
14.6%
+1.6 pts
Top 5
54.1%
+2.4 pts
Top 10
76.2%
+1.3 pts
HHI
750
Broadly held
+32
Quarterly Activity
vs Dec 31, 2025
New
7
Increased
8
Decreased
12
Sold Out
11
Unchanged
11
Holder count:
-4
Institutional value:
-14.4%
Shares held:
-13.0%
Top Buyers
vs Dec 31, 2025| Institution | Added | Now Holds | Open |
|---|---|---|---|
| Mega GEODE CAPITAL MANAGEMENT, LLC | +9,899 | 231,020 | |
| Mid BRIDGEWAY CAPITAL MANAGEMENT, LLC | +8,900 | 98,447 | |
| Mega BlackRock, Inc. | +4,472 | 293,104 | |
| Mega MORGAN STANLEY | +2,135 | 165,554 | |
| Mega ROYAL BANK OF CANADA | +1,003 | 1,189 |
Top Sellers
vs Dec 31, 2025| Institution | Sold | Now Holds | Open |
|---|---|---|---|
| Mega MILLENNIUM MANAGEMENT LLC | −29,898 | 105,540 | |
| Large Squarepoint Ops LLC | −22,790 | 41,214 | |
| Mega DIMENSIONAL FUND ADVISORS LP | −14,642 | 36,053 | |
| Mega JANE STREET GROUP, LLC | −9,638 | 60,100 | |
| Mega Bank of New York Mellon Corp | −9,096 | 39,355 |
Top New Positions
vs Dec 31, 2025| Institution | Acquired | Value (USD) | Open |
|---|---|---|---|
| Mega VANGUARD CAPITAL MANAGEMENT LLC | 200,971 | $472,281 | |
| Mega VANGUARD FIDUCIARY TRUST CO | 91,576 | $215,203 | |
| Large RENAISSANCE TECHNOLOGIES LLC | 22,438 | $52,729 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | 21,100 | $49,585 | |
| Mega Vanguard Global Advisers, LLC | 7,009 | $16,471 |
Top Sold-Out Positions
vs Dec 31, 2025| Institution | Previously Held | Last Value (USD) | Open |
|---|---|---|---|
| Mega VANGUARD GROUP INC | 299,556 | $715,937 | |
| Mega AMERIPRISE FINANCIAL INC | 186,796 | $446,442 | |
| Mega CITADEL ADVISORS LLC | 18,400 | $43,976 | |
| Mega GOLDMAN SACHS GROUP INC | 16,831 | $40,226 | |
| Large TWO SIGMA ADVISERS, LP | 16,300 | $38,957 |
| Holder | Value (USD) | % of 13F | Shares | Type | Discretion | Filed | Open | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Mega BlackRock, Inc. | $688,792 | 14.55% | 293,104 | Shares | Sole | 2026-05-13 | ||||
| Mega GEODE CAPITAL MANAGEMENT, LLC | $542,896 | 11.47% | 231,020 | Shares | Defined | 2026-05-15 | ||||
| Mega VANGUARD CAPITAL MANAGEMENT LLC | $472,281 | 9.98% | 200,971 | Shares | Defined | 2026-05-15 | ||||
| Mid RBF Capital, LLC | $466,477 | 9.86% | 198,501 | Shares | Sole | 2026-05-18 | ||||
| Mega MORGAN STANLEY | $389,050 | 8.22% | 165,554 | Shares | Defined | 2026-05-15 | ||||
| Mega MILLENNIUM MANAGEMENT LLC | $248,019 | 5.24% | 105,540 | Shares | Sole | 2026-05-15 | ||||
| Mid BRIDGEWAY CAPITAL MANAGEMENT, LLC | $231,350 | 4.89% | 98,447 | Shares | Sole | 2026-05-15 | ||||
| Mega VANGUARD FIDUCIARY TRUST CO Bank | $215,203 | 4.55% | 91,576 | Shares | Defined | 2026-05-08 | ||||
| Mega NORTHERN TRUST CORP Bank | $178,804 | 3.78% | 76,087 | Shares | Defined | 2026-05-14 | ||||
| Mega STATE STREET CORP | $171,564 | 3.63% | 73,006 | Shares | Defined | 2026-05-15 | ||||
| Mega JANE STREET GROUP, LLC | $141,234 | 2.98% | 60,100 | Shares | Defined | 2026-05-12 | ||||
| Large Empowered Funds, LLC | $139,935 | 2.96% | 59,547 | Shares | Other | 2026-05-15 | ||||
| Large Squarepoint Ops LLC | $96,852 | 2.05% | 41,214 | Shares | Defined | 2026-05-15 | ||||
| Mega Bank of New York Mellon Corp Bank | $92,483 | 1.95% | 39,355 | Shares | Defined | 2026-05-05 | ||||
| Mega BANK OF AMERICA CORP /DE/ Bank | $86,219 | 1.82% | 36,689 | Shares | Defined | 2026-05-18 | ||||
| Mega DIMENSIONAL FUND ADVISORS LP | $84,723 | 1.79% | 36,053 | Shares | Sole | 2026-05-07 | ||||
| Large Connor, Clark & Lunn Investment Management Ltd. | $67,358 | 1.42% | 28,663 | Shares | Sole | 2026-05-11 | ||||
| Mega BNP PARIBAS ARBITRAGE, SA | $63,835 | 1.35% | 27,164 | Shares | Defined | 2026-05-12 | ||||
| Large NATIONAL BANK OF CANADA /FI/ Bank | $58,750 | 1.24% | 25,000 | Shares | Defined | 2026-05-15 | ||||
| Large RENAISSANCE TECHNOLOGIES LLC | $52,729 | 1.11% | 22,438 | Shares | Sole | 2026-05-14 | ||||
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $49,585 | 1.05% | 21,100 | Call | Other | 2026-05-15 | ||||
| Mega AMERICAN CENTURY COMPANIES INC | $44,370 | 0.94% | 18,881 | Shares | Defined | 2026-05-15 | ||||
| Large Qube Research & Technologies Ltd | $43,923 | 0.93% | 18,691 | Shares | Sole | 2026-05-15 | ||||
| Mid XTX Topco Ltd | $42,067 | 0.89% | 17,901 | Shares | Defined | 2026-05-15 | ||||
| Mid Pinnacle Financial Partners, Inc. | $27,720 | 0.59% | 11,796 | Shares | Defined | 2026-05-14 | ||||
| Mega Vanguard Global Advisers, LLC | $16,471 | 0.35% | 7,009 | Shares | Defined | 2026-05-08 | ||||
| Mega UBS Group AG | $11,832 | 0.25% | 5,035 | Shares | Defined | 2026-05-05 | ||||
| Mega ROYAL BANK OF CANADA Bank | $2,794 | 0.06% | 1,189 | Shares | Defined | 2026-05-15 | ||||
| Mega RHUMBLINE ADVISERS | $2,180 | 0.05% | 928 | Shares | Sole | 2026-05-12 | ||||
| Small McIlrath & Eck, LLC | $1,769 | 0.04% | 753 | Shares | Sole | 2026-05-19 | ||||
| Large JONES FINANCIAL COMPANIES LLLP | $869 | 0.02% | 370 | Shares | Sole | 2026-05-15 | ||||
| Mega JPMORGAN CHASE & CO | $225 | 0.00% | 96 | Shares | Defined | 2026-05-13 | ||||
| Mid SBI Securities Co., Ltd. Broker-Dealer | $86 | 0.00% | 37 | Shares | Defined | 2026-04-28 | ||||
| Mid Larson Financial Group LLC | $49 | 0.00% | 21 | Shares | Sole | 2026-05-15 | ||||
| Mid Arax Advisory Partners | $35 | 0.00% | 15 | Shares | Sole | 2026-05-13 | ||||
| Large CWM, LLC | $30 | 0.00% | 13 | Shares | Sole | 2026-05-14 | ||||
| Small Caitong International Asset Management Co., Ltd | $25 | 0.00% | 11 | Shares | Sole | 2026-05-11 | ||||
| Mid Optiver Holding B.V. | $18 | 0.00% | 8 | Shares | Defined | 2026-05-15 | ||||
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