XBiotech Inc.
DE ˙ DB ˙ CA98400H1029
1,91 € ↓ -0,13 (-6,24%)
2026-06-04
DEL PRIS
SecurityDE:4XB / XBiotech Inc.
InstitutionBlackRock, Inc.
Latest Disclosed Ownership293,104 shares
Latest Disclosed Value $ 688,795
BlackRock, Inc. reports 1.55% increase in ownership of 4XB / XBiotech Inc.

On May 13, 2026 - BlackRock, Inc. filed a 13F-HR form disclosing ownership of 293,104 shares of XBiotech Inc. (DE:4XB) valued at $542,242 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 288,632 shares of XBiotech Inc.. This represents a change in shares of 1.55% during the quarter. The current value of the position is $559,242 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)
2026-05-13 2026-03-31 13F XBIOTECH COM 98400H102 293,104 4,472 1.55 689 -0.15 0.0000
2026-02-12 2025-12-31 13F XBIOTECH COM 98400H102 288,632 -13,754 -4.55 690 -14.30 0.0000
2025-11-12 2025-09-30 13F XBIOTECH COM 98400H102 302,386 -71,220 -19.06 804 -27.50 0.0000
2025-08-12 2025-06-30 13F XBIOTECH COM 98400H102 373,606 -912,157 -70.94 1,110 -73.37 0.0000
2025-05-02 2025-03-31 13F XBIOTECH COM 98400H102 1,285,763 -8,357 -0.65 4,166 -18.51 0.0001
2025-02-07 2024-12-31 13F XBIOTECH COM 98400H102 1,294,120 44,119 3.53 5,112 -47.10 0.0001
2024-11-13 2024-09-30 13F XBIOTECH COM 98400H102 1,250,001 115,855 10.22 9,663 65.76 0.0002
2024-08-13 2024-06-30 13F XBIOTECH COM 98400H102 1,134,146 827,522 269.88 5,830 133.91 0.0001
2024-05-10 2024-03-31 13F XBIOTECH COM 98400H102 306,624 28,465 10.23 2,493 124.10 0.0001
2024-02-13 2023-12-31 13F XBIOTECH COM 98400H102 278,159 -676 -0.24 1,113 -3.14 0.0000
2023-11-13 2023-09-30 13F XBIOTECH COM 98400H102 278,835 -11,012 -3.80 1,149 -33.29 0.0000
2023-08-11 2023-06-30 13F XBIOTECH COM 98400H102 289,847 27,651 10.55 1,722 90.38 0.0000
2023-05-12 2023-03-31 13F XBIOTECH COM 98400H102 262,196 995 0.38 905 -1.31 0.0000
2023-02-13 2022-12-31 13F XBIOTECH COM 98400H102 261,201 2,267 0.88 917 -2.35 0.0000
2022-11-14 2022-09-30 13F XBIOTECH COM 98400H102 258,934 4,002 1.57 938 -34.63 0.0000
2022-08-12 2022-06-30 13F XBIOTECH COM 98400H102 254,932 -774,178 -75.23 1,435 -83.86 0.0000
2022-05-12 2022-03-31 13F XBIOTECH COM 98400H102 1,029,110 -26,666 -2.53 8,890 -24.35 0.0002
2022-02-10 2021-12-31 13F XBIOTECH COM 98400H102 1,055,776 -167,878 -13.72 11,751 -25.85 0.0003
2021-11-09 2021-09-30 13F XBIOTECH COM 98400H102 1,223,654 22,057 1.84 15,847 -20.37 0.0004
2021-08-11 2021-06-30 13F XBIOTECH COM 98400H102 1,201,597 -155,978 -11.49 19,900 -14.63 0.0006
2021-05-07 2021-03-31 13F XBIOTECH COM 98400H102 1,357,575 53,564 4.11 23,311 14.22 0.0007
2021-02-05 2020-12-31 13F XBIOTECH COM 98400H102 1,304,011 20,301 1.58 20,408 -16.72 0.0007
2020-11-06 2020-09-30 13F XBIOTECH COM 98400H102 1,283,710 -16,150 -1.24 24,505 37.51 0.0009
2020-08-14 2020-06-30 13F XBIOTECH COM 98400H102 1,299,860 8,956 0.69 17,820 29.99 0.0007
2020-05-01 2020-03-31 13F XBIOTECH COM 98400H102 1,290,904 -461,017 -26.31 13,709 -58.08 0.0007
2020-02-13 2019-12-31 13F XBIOTECH COM 98400H102 1,751,921 483,022 38.07 32,700 146.36 0.0013
2019-11-08 2019-09-30 13F XBIOTECH COM 98400H102 1,268,899 74,985 6.28 13,273 46.68 0.0006
2019-08-22 2019-06-30 13F/A-1 XBIOTECH COM 98400H102 1,193,914 1,088,946 1,037.41 9,049 682.11 0.0004
2019-08-13 2019-06-30 13F XBIOTECH COM 98400H102 1,193,914 1,088,946 9,049
2019-05-09 2019-03-31 13F XBIOTECH COM 98400H102 104,968 16,907 19.20 1,157 158.84 0.0001
2019-02-08 2018-12-31 13F XBIOTECH COM 98400H102 88,061 654 0.75 447 60.79 0.0000
2018-11-09 2018-09-30 13F XBIOTECH COM 98400H102 87,407 2,313 2.72 278 -27.03 0.0000
2018-08-09 2018-06-30 13F XBIOTECH COM 98400H102 85,094 -820,971 -90.61 381 -92.14 0.0000
2018-05-09 2018-03-31 13F XBIOTECH COM 98400H102 906,065 -10,223 -1.12 4,847 34.27 0.0002
2018-02-09 2017-12-31 13F XBIOTECH COM 98400H102 916,288 -555,485 -37.74 3,610 -43.87 0.0002
2017-11-14 2017-09-30 13F XBIOTECH COM 98400H102 1,471,773 29,832 2.07 6,432 -5.09 0.0003
2017-08-10 2017-06-30 13F XBIOTECH COM 98400H102 1,441,941 150,783 11.68 6,777 -68.17 0.0004
2017-05-12 2017-03-31 13F XBIOTECH COM 98400H102 1,291,158 1,290,253 142,569.39 21,291 236,466.67 0.0012
2017-02-10 2016-12-31 13F XBIOTECH COM 98400H102 905 0 0.00 9 -25.00 0.0000
2016-11-08 2016-09-30 13F XBIOTECH COM 98400H102 905 254 39.02 12 -14.29 0.0000
2016-08-10 2016-06-30 13F XBIOTECH COM 98400H102 651 537 471.05 14 1,300.00 0.0000
2016-05-10 2016-03-31 13F XBIOTECH COM 98400H102 114 114 1 0.0000
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.