XBIT · XBiotech Inc.

$2.30 -0.01 (-0.43%) At close · Aug 27

Market Cap

$69.21M

30.49M

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.

Quarter:

Holders: 37

Total Value: $4,898,474

Total Shares: 2,129,780

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 37 13F filers · Δ vs Mar 31, 2026

Top Holder

15.1%

+0.5 pts

Top 5

50.8%

−3.3 pts

Top 10

71.0%

−5.2 pts

HHI

691

Broadly held−60

Quarterly Activity

vs Mar 31, 2026

New

Increased

Decreased

Sold Out

Unchanged

Holder count: -1

Institutional value: +3.5%

Shares held: +5.8%

Top Buyers

vs Mar 31, 2026

Institution	Added	Now Holds
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP	+52,800	73,900
Mega BlackRock, Inc.	+28,042	321,146
Mega JANE STREET GROUP, LLC	+26,076	86,176
Large RENAISSANCE TECHNOLOGIES LLC	+19,225	41,663
Mega Qube Research & Technologies Ltd	+14,879	33,570

Top Sellers

vs Mar 31, 2026

Institution	Sold	Now Holds
Mega MILLENNIUM MANAGEMENT LLC	−26,210	79,330
Mega MORGAN STANLEY	−17,674	147,880
Mega GEODE CAPITAL MANAGEMENT, LLC	−16,904	214,116
Mega BANK OF AMERICA CORP /DE/	−12,900	23,789
Mega NORTHERN TRUST CORP	−9,829	66,258

Top New Positions

vs Mar 31, 2026

Institution	Acquired	Value (USD)
Mid GSA CAPITAL PARTNERS LLP	30,654	$70,504
Mega CITADEL ADVISORS LLC	29,192	$67,141
Mid Thomasville National Bank	13,350	$30,705
Mega BARCLAYS PLC	94	$216

Top Sold-Out Positions

vs Mar 31, 2026

Institution	Previously Held	Last Value (USD)
Mega RHUMBLINE ADVISERS	928	$2,180
Small McIlrath & Eck, LLC	753	$1,769
Mid Arax Advisory Partners	15	$35
Large CWM, LLC	13	$30
Mid Optiver Holding B.V.	8	$18

Filter: New 4 Increased 7 Reduced 11 Sold out 5 Unchanged 15

Showing 39 of 39

All Common Calls Puts

Compact Export CSV

Holder

Value (USD)

% of 13F

BlackRock, Inc.

$738,634

15.08%

321,146

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BLACKROCK FINANCIAL MANAGEMENT INC/DE	30,296	$69,680	9.4%	Sole
BlackRock Investment Management, LLC	5,302	$12,194	1.7%	Sole
BlackRock Fund Advisors	78,591	$180,759	24.5%	Sole
BlackRock Institutional Trust Company, N.A.	206,957	$476,001	64.4%	Sole

GEODE CAPITAL MANAGEMENT, LLC

$492,466

10.05%

214,116

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GEODE CAPITAL MANAGEMENT TRUST COMPANY, LLC	40,755	$93,736	19.0%	Defined
Held directly	173,361	$398,730	81.0%	Defined

VANGUARD CAPITAL MANAGEMENT LLC

$460,418

9.40%

200,182

RBF Capital, LLC

$456,552

9.32%

198,501

MORGAN STANLEY

$340,123

6.94%

147,880

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Morgan Stanley Canada LTD	917	$2,109	0.6%	Defined
MORGAN STANLEY CAPITAL SERVICES, LLC	146,963	$338,014	99.4%	Defined

BRIDGEWAY CAPITAL MANAGEMENT, LLC

$226,428

4.62%

98,447

VANGUARD FIDUCIARY TRUST CO

$212,439

4.34%

92,365

MILLENNIUM MANAGEMENT LLC

$182,459

3.72%

79,330

JANE STREET GROUP, LLC

$171,810

3.51%

74,700

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Jane Street Capital, LLC	74,700	$171,810	100.0%	Defined

STATE STREET CORP

$167,913

3.43%

73,006

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
STATE STREET GLOBAL ADVISORS TRUST COMPANY	73,006	$167,913	100.0%	Defined

NORTHERN TRUST CORP

$152,392

3.11%

66,258

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
NORTHERN TRUST CO joint	37,743	$86,808	57.0%	Defined
NORTHERN TRUST GLOBAL INVESTMENTS LTD	28,515	$65,584	43.0%	Defined

Empowered Funds, LLC

$136,958

2.80%

59,547

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Bridgeway Capital Management, LLC	59,547	$136,958	100.0%	Other

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$101,200

2.07%

44,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	44,000	$101,200	100.0%	Other

RENAISSANCE TECHNOLOGIES LLC

$95,824

1.96%

41,663

Bank of New York Mellon Corp

$90,515

1.85%

39,355

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
The Bank of New York Mellon	1,956	$4,498	5.0%	Defined
Newton Investment Management North America, LLC	37,399	$86,017	95.0%	Defined

DIMENSIONAL FUND ADVISORS LP

$82,920

1.69%

36,053

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Dimensional Fund Advisors Ltd.	2,245	$5,163	6.2%	Defined
DFA Australia Ltd.	562	$1,292	1.6%	Defined
Dimensional Ireland Ltd	11,926	$27,429	33.1%	Defined
Held directly	21,320	$49,036	59.1%	Sole

Squarepoint Ops LLC

$79,941

1.63%

34,757

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Squarepoint Capital LLP	34,757	$79,941	100.0%	Defined

Qube Research & Technologies Ltd

$77,211

1.58%

33,570

GSA CAPITAL PARTNERS LLP

$70,504

1.44%

30,654

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$68,770

1.40%

29,900

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	29,900	$68,770	100.0%	Other

CITADEL ADVISORS LLC

$67,141

1.37%

29,192

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	29,192	$67,141	100.0%	Defined

Connor, Clark & Lunn Investment Management Ltd.

$64,268

1.31%

27,943

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Manager 1	27,943	$64,268	100.0%	Sole

BNP PARIBAS ARBITRAGE, SA

$60,867

1.24%

26,464

NATIONAL BANK OF CANADA /FI/

$57,500

1.17%

25,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
National Bank Financial Inc.	25,000	$57,500	100.0%	Defined

BANK OF AMERICA CORP /DE/

$54,714

1.12%

23,789

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
MERRILL LYNCH INTERNATIONAL	23,789	$54,714	100.0%	Defined

AMERICAN CENTURY COMPANIES INC

$42,276

0.86%

18,381

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
AMERICAN CENTURY INVESTMENT MANAGEMENT INC	18,381	$42,276	100.0%	Defined

Thomasville National Bank

$30,705

0.63%

13,350

XTX Topco Ltd

$30,084

0.61%

13,080

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
XTX EXECUTION SERVICES LLC joint	13,080	$30,084	100.0%	Defined

Pinnacle Financial Partners, Inc.

$27,130

0.55%

11,796

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SYNOVUS TRUST CO NA	11,796	$27,130	100.0%	Defined

JANE STREET GROUP, LLC

$26,394

0.54%

11,476

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Jane Street Capital, LLC	1	$2	0.0%	Defined
Jane Street Global Trading, LLC	11,475	$26,392	100.0%	Defined

Vanguard Global Advisers, LLC

$16,120

0.33%

7,009

UBS Group AG

$11,580

0.24%

5,035

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
UBS AG	5,035	$11,580	100.0%	Defined

ROYAL BANK OF CANADA

$2,773

0.06%

1,206

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
RBC CMA LTD.	74	$170	6.1%	Defined
RBC Capital Markets, LLC	1,132	$2,603	93.9%	Defined

JONES FINANCIAL COMPANIES LLLP

$851

0.02%

370

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Edward D. Jones & Co., L.P.	370	$851	100.0%	Sole

JPMORGAN CHASE & CO

$220

0.00%

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
J.P. Morgan Securities plc	96	$220	100.0%	Defined

BARCLAYS PLC

$216

0.00%

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BARCLAYS CAPITAL INC.	94	$216	100.0%	Defined

SBI Securities Co., Ltd.

$85

0.00%

Larson Financial Group LLC

$48

0.00%

Caitong International Asset Management Co., Ltd

$25

0.00%

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Optiver VOF	8	$18	100.0%	Defined

Key facts CIK 1626878 CUSIP 98400H102 13F (30d) 35 filings 35 filers Visit website Investor relations