International Bancshares Corporation
US ˙ NasdaqGS ˙ US4590441030

SecurityIBOC / International Bancshares Corporation
InstitutionQube Research & Technologies Ltd
Latest Disclosed Ownership138,113 shares
Latest Disclosed Value $ 9,293,624
Qube Research & Technologies Ltd reports 696.82% increase in ownership of IBOC / International Bancshares Corporation

On May 15, 2026 - Qube Research & Technologies Ltd filed a 13F-HR form disclosing ownership of 138,113 shares of International Bancshares Corporation (US:IBOC) valued at $9,293,624 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 17,333 shares of International Bancshares Corporation. This represents a change in shares of 696.82% during the quarter. The current value of the position is $9,806,023 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 INTERNATIONAL BANCSHARES COR COM 459044103 138,113 120,780 696.82 9,294 707.38 0.0103
2026-02-17 2025-12-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 17,333 -47,446 -73.24 1,152 -74.15 0.0012
2025-11-14 2025-09-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 64,779 -18,700 -22.40 4,454 -19.85 0.0046
2025-08-14 2025-06-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 83,479 -252 -0.30 5,556 5.23 0.0056
2025-05-15 2025-03-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 83,731 -44,096 -34.50 5,280 -34.60 0.0061
2025-02-14 2024-12-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 127,827 2,182 1.74 8,074 7.47 0.0106
2024-11-14 2024-09-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 125,645 65,962 110.52 7,512 120.04 0.0111
2024-08-14 2024-06-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 59,683 -10,391 -14.83 3,414 -13.20 0.0054
2024-05-14 2024-03-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 70,074 -15,002 -17.63 3,934 -14.89 0.0062
2024-02-13 2023-12-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 85,076 26,810 46.01 4,621 83.01 0.0090
2023-11-13 2023-09-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 58,266 51,627 777.63 2,525 761.77 0.0066
2023-08-14 2023-06-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 6,639 -596 -8.24 293 -5.18 0.0011
2023-05-15 2023-03-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 7,235 7,235 310 0.0013
2022-11-14 2022-09-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 0 -5,317 -100.00 0 -100.00
2022-08-15 2022-06-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 5,317 5,317 213 0.0016
2022-05-09 2022-03-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 0 -10,062 -100.00 0 -100.00
2022-02-10 2021-12-31 13F/A-1 INTERNATIONAL BANCSHARES COR COM 459044103 10,062 -718 -6.66 427 -4.90 0.0033
2022-02-01 2021-12-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 10,062 -718 427 0.0033
2021-11-12 2021-09-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 10,780 2,307 27.23 449 23.35 0.0056
2021-08-13 2021-06-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 8,473 8,473 364 0.0041
2021-02-16 2020-12-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 0 -19,925 -100.00 0 -100.00
2020-11-12 2020-09-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 19,925 430 2.21 519 -16.83 0.0074
2020-08-14 2020-06-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 19,495 19,495 -2.16 624 20.23 0.0092
2020-05-15 2020-03-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 0 -8,837 -100.00 0 -100.00
2020-02-13 2019-12-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 8,837 8,837 381 0.0120
2019-02-14 2018-12-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 0 -1,951 -100.00 0 -100.00
2018-11-14 2018-09-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 1,951 1,714 723.21 88 780.00 0.0117
2018-08-15 2018-06-30 13F/A-1 INTERNATIONAL BANCSHARES COR COM 459044103 237 237 10 0.0063
2018-08-14 2018-06-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 237 10 0.0063
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.