XBiotech Inc.
DE ˙ DB ˙ CA98400H1029
1,91 € ↓ -0,13 (-6,24%)
2026-06-04
DEL PRIS
SecurityDE:4XB / XBiotech Inc.
InstitutionMillennium Management Llc
ManagerIsrael Englander
Latest Disclosed Ownership105,540 shares
Latest Disclosed Value $ 248,019
Millennium Management Llc reports 22.08% decrease in ownership of 4XB / XBiotech Inc.

On May 15, 2026 - Millennium Management Llc filed a 13F-HR form disclosing ownership of 105,540 shares of XBiotech Inc. (DE:4XB) valued at $195,249 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 135,438 shares of XBiotech Inc.. This represents a change in shares of -22.08% during the quarter. The current value of the position is $201,370 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F XBIOTECH COM 98400H102 105,540 -29,898 -22.08 248 -23.22 0.0001
2026-02-17 2025-12-31 13F XBIOTECH COM 98400H102 135,438 -280,906 -67.47 324 -70.82 0.0001
2025-11-14 2025-09-30 13F XBIOTECH COM 98400H102 416,344 -135,003 -24.49 1,107 -32.38 0.0005
2025-08-14 2025-06-30 13F XBIOTECH COM 98400H102 551,347 468,991 569.47 1,638 515.41 0.0008
2025-05-15 2025-03-31 13F XBIOTECH COM 98400H102 82,356 -181,166 -68.75 267 -74.42 0.0001
2025-02-14 2024-12-31 13F XBIOTECH COM 98400H102 263,522 -17,497 -6.23 1,041 -52.12 0.0005
2024-11-14 2024-09-30 13F XBIOTECH COM 98400H102 281,019 -80,642 -22.30 2,172 16.90 0.0010
2024-08-14 2024-06-30 13F XBIOTECH COM 98400H102 361,661 -565,707 -61.00 1,859 -75.35 0.0009
2024-05-15 2024-03-31 13F XBIOTECH COM 98400H102 927,368 131,642 16.54 7,540 136.93 0.0032
2024-02-14 2023-12-31 13F XBIOTECH COM 98400H102 795,726 -135,718 -14.57 3,183 -17.07 0.0014
2023-11-14 2023-09-30 13F XBIOTECH COM 98400H102 931,444 -28,314 -2.95 3,838 -32.68 0.0019
2023-08-14 2023-06-30 13F XBIOTECH COM 98400H102 959,758 914,107 2,002.38 5,701 3,530.57 0.0028
2023-05-15 2023-03-31 13F XBIOTECH COM 98400H102 45,651 -6,593 -12.62 157 -14.21 0.0001
2023-02-14 2022-12-31 13F XBIOTECH COM 98400H102 52,244 -85,743 -62.14 183 -63.40 0.0001
2022-11-14 2022-09-30 13F XBIOTECH COM 98400H102 137,987 -146,692 -51.53 500 -68.81 0.0003
2022-08-15 2022-06-30 13F XBIOTECH COM 98400H102 284,679 267,953 1,602.01 1,603 1,005.52 0.0010
2022-05-16 2022-03-31 13F XBIOTECH COM 98400H102 16,726 -2,071 -11.02 145 -30.62 0.0001
2022-02-14 2021-12-31 13F XBIOTECH COM 98400H102 18,797 3,787 25.23 209 7.73 0.0001
2021-11-15 2021-09-30 13F XBIOTECH COM 98400H102 15,010 15,010 194 0.0001
2021-08-16 2021-06-30 13F XBIOTECH COM 98400H102 0 -10,056 -100.00 0 -100.00
2021-05-17 2021-03-31 13F XBIOTECH COM 98400H102 10,056 10,056 173 0.0001
2020-08-14 2020-06-30 13F XBIOTECH COM 98400H102 0 -30,047 -100.00 0 -100.00
2020-05-14 2020-03-31 13F XBIOTECH COM 98400H102 30,047 -108,510 -78.31 319 -87.66 0.0007
2020-02-14 2019-12-31 13F XBIOTECH COM 98400H102 138,557 121,895 731.57 2,586 1,386.21 0.0032
2019-11-14 2019-09-30 13F XBIOTECH COM 98400H102 16,662 5,146 44.69 174 100.00 0.0003
2019-08-15 2019-06-30 13F/A-1 XBIOTECH COM 98400H102 11,516 -200,832 -94.58 87 -96.28 0.0001
2019-08-14 2019-06-30 13F BP PRUDHOE BAY RTY TR UNIT BEN INT 98400H102 13,251 -199,097 205
2019-05-14 2019-03-31 13F XBIOTECH COM 98400H102 212,348 163,312 333.05 2,340 839.76 0.0035
2019-02-15 2018-12-31 13F/A-1 XBIOTECH COM 98400H102 49,036 -113,392 -69.81 249 -51.84 0.0004
2019-02-14 2018-12-31 13F XBIOTECH COM 98400H102 49,036 249
2018-11-14 2018-09-30 13F XBIOTECH COM 98400H102 162,428 -45,340 -21.82 517 -44.47 0.0006
2018-08-14 2018-06-30 13F XBIOTECH COM 98400H102 207,768 207,768 931 0.0012
2018-05-15 2018-03-31 13F XBIOTECH COM 98400H102 0 -21,714 -100.00 0 -100.00
2018-02-14 2017-12-31 13F XBIOTECH COM 98400H102 21,714 21,714 86 0.0001
2016-05-16 2016-03-31 13F XBIOTECH COM 98400H102 0 -15,771 -100.00 0 -100.00
2016-02-16 2015-12-31 13F XBIOTECH COM 98400H102 15,771 3,323 26.70 171 -8.06 0.0004
2015-11-16 2015-09-30 13F XBIOTECH COM 98400H102 12,448 -554 -4.26 186 -20.85 0.0004
2015-08-14 2015-06-30 13F XBIOTECH COM 98400H102 13,002 13,002 235 0.0004
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.