XBiotech Inc.
DE ˙ DB ˙ CA98400H1029
1,91 € ↓ -0,13 (-6,24%)
2026-06-04
DEL PRIS
SecurityDE:4XB / XBiotech Inc.
InstitutionBnp Paribas Arbitrage, Sa
Latest Disclosed Ownership27,164 shares
Latest Disclosed Value $ 63,835
Bnp Paribas Arbitrage, Sa reports 1.12% increase in ownership of 4XB / XBiotech Inc.

On May 12, 2026 - Bnp Paribas Arbitrage, Sa filed a 13F-HR form disclosing ownership of 27,164 shares of XBiotech Inc. (DE:4XB) valued at $50,253 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 26,864 shares of XBiotech Inc.. This represents a change in shares of 1.12% during the quarter. The current value of the position is $51,829 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)
2026-05-12 2026-03-31 13F XBiotech Equity 98400H102 27,164 300 1.12 64 -1.56 0.0000
2026-02-10 2025-12-31 13F XBiotech Equity 98400H102 26,864 6,254 30.34 64 18.52 0.0000
2025-11-13 2025-09-30 13F XBiotech Equity 98400H102 20,610 -119 -0.57 55 -11.48 0.0000
2025-08-14 2025-06-30 13F XBiotech Equity 98400H102 20,729 4,416 27.07 62 17.31 0.0000
2025-05-14 2025-03-31 13F XBiotech Equity 98400H102 16,313 -1,055 -6.07 53 -23.53 0.0000
2025-02-14 2024-12-31 13F XBiotech Equity 98400H102 17,368 -22,672 -56.62 69 -77.99 0.0000
2024-11-13 2024-09-30 13F XBiotech Equity 98400H102 40,040 25,987 184.92 310 329.17 0.0002
2024-08-13 2024-06-30 13F XBiotech Equity 98400H102 14,053 1,531 12.23 72 -28.71 0.0001
2024-05-01 2024-03-31 13F XBiotech Equity 98400H102 12,522 1,200 10.60 102 124.44 0.0001
2024-02-14 2023-12-31 13F/A-2 XBiotech Equity 98400H102 11,322 500 4.62 45 2.27 0.0001
2024-02-07 2023-12-31 13F/A-1 XBiotech Equity 98400H102 11,322 500 45 0.0000
2024-02-07 2023-12-31 13F XBiotech Equity 98400H102 11,322 500 45 0.0000
2023-11-14 2023-09-30 13F XBiotech Equity 98400H102 10,822 1,235 12.88 45 -21.43 0.0001
2023-08-09 2023-06-30 13F XBiotech Equity 98400H102 9,587 8,114 550.85 57 1,020.00 0.0001
2023-05-12 2023-03-31 13F XBIOTECH EQUITY 98400H102 1,473 1,073 268.25 5 400.00 0.0000
2023-02-14 2022-12-31 13F XBiotech Equity 98400H102 400 -1,626 -80.26 1 -85.71 0.0000
2022-11-16 2022-09-30 13F/A-1 XBiotech Equity 98400H102 2,026 -5,989 -74.72 7 -84.44 0.0000
2022-11-15 2022-09-30 13F XBiotech Equity 98400H102 2,026 -5,989 7 0.0000
2022-08-12 2022-06-30 13F XBiotech Equity 98400H102 8,015 -3,889 -32.67 45 -55.88 0.0001
2022-05-18 2022-03-31 13F/A-1 XBiotech Equity 98400H102 11,904 -1,115 -8.56 103 -29.17 0.0001
2022-02-09 2021-12-31 13F XBIOTECH EQUITY 98400H102 13,019 8,409 182.41 145 144.07 0.0002
2021-11-16 2021-09-30 13F/A-1 XBIOTECH EQUITY 98400H102 4,610 1,787 63.30 60 28.26 0.0001
2021-11-12 2021-09-30 13F XBIOTECH EQUITY 98400H102 3,736 913 71 0.0000
2021-08-10 2021-06-30 13F XBIOTECH EQUITY 98400H102 2,823 -4,131 -59.40 47 -61.34 0.0001
2021-05-07 2021-03-31 13F XBIOTECH EQUITY 98400H102 6,954 3,139 82.28 119 101.69 0.0002
2021-02-10 2020-12-31 13F XBIOTECH EQUITY 98400H102 3,815 79 2.11 60 -16.90 0.0001
2020-10-30 2020-09-30 13F XBIOTECH EQUITY 98400H102 3,736 3,177 568.34 71 914.29 0.0001
2020-08-06 2020-06-30 13F XBIOTECH EQUITY 98400H102 559 -5,866 -91.30 8 -89.71 0.0000
2020-05-13 2020-03-31 13F XBIOTECH EQUITY 98400H102 6,425 4,223 191.78 68 65.85 0.0001
2020-02-12 2019-12-31 13F XBIOTECH EQUITY 98400H102 2,202 1,333 153.39 41 355.56 0.0001
2019-11-07 2019-09-30 13F XBIOTECH EQUITY 98400H102 869 778 854.95 9 0.0000
2019-07-30 2019-06-30 13F XBIOTECH EQUITY 98400H102 91 36 65.45 1 13.86 0.0000
2019-04-25 2019-03-31 13F XBIOTECH EQUITY 98400H102 55 0 0.00 1 117.20 0.0000
2019-02-12 2018-12-31 13F XBIOTECH EQUITY 98400H102 55 0 0.00 0 59.43 0.0000
2018-11-07 2018-09-30 13F XBIOTECH EQUITY 98400H102 55 0 0.00 0 -28.86 0.0000
2018-07-25 2018-06-30 13F XBIOTECH EQUITY 98400H102 55 -4,647 -98.83 0 -100.00 0.0000
2018-05-11 2018-03-31 13F XBIOTECH EQUITY 98400H102 4,702 188 4.16 25 47.06 0.0000
2018-03-05 2017-12-31 13F/A-1 XBIOTECH EQUITY 98400H102 4,514 2,041 82.53 18 70.00 0.0000
2018-02-01 2017-12-31 13F XBIOTECH EQUITY 98400H102 4,514 2,041 18
2017-11-03 2017-09-30 13F XBIOTECH STOCK 98400H102 2,473 0 0.00 11 -9.09 0.0000
2017-08-03 2017-06-30 13F XBIOTECH STOCK 98400H102 2,473 2,406 3,591.04 12 1,000.00 0.0000
2017-05-03 2017-03-31 13F XBIOTECH STOCK 98400H102 67 -560 -89.31 1 -83.33 0.0000
2017-02-14 2016-12-31 13F XBIOTECH STOCK 98400H102 627 -664 -51.43 6 -64.71 0.0000
2016-10-05 2016-09-30 13F * XBIOTECH INC COM STOCK 98400H102 1,291 601 87.10 17 21.43 0.0001
2016-07-06 2016-06-30 13F XBIOTECH INC COM STOCK 98400H102 690 690 14 0.0001
2016-04-22 2016-03-31 13F XBIOTECH INC COM STOCK 98400H102 0 -674 -100.00 0 -100.00
2016-04-19 2015-12-31 13F/A-1 XBIOTECH INC COM STOCK 98400H102 674 -272 -28.75 7 -50.00 0.0000
2016-02-10 2015-12-31 13F XBIOTECH INC COM STOCK 98400H102 674 7
2015-11-13 2015-09-30 13F XBIOTECH INC COM STOCK 98400H102 946 946 14 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.