International Bancshares Corporation
US ˙ NasdaqGS ˙ US4590441030

SecurityIBOC / International Bancshares Corporation
InstitutionNorthern Trust Corp
Latest Disclosed Ownership666,974 shares
Latest Disclosed Value $ 44,880,680
Northern Trust Corp reports 3.17% increase in ownership of IBOC / International Bancshares Corporation

On May 14, 2026 - Northern Trust Corp filed a 13F-HR form disclosing ownership of 666,974 shares of International Bancshares Corporation (US:IBOC) valued at $44,880,680 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 646,450 shares of International Bancshares Corporation. This represents a change in shares of 3.17% during the quarter. The current value of the position is $48,649,084 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)
2026-05-14 2026-03-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 666,974 20,524 3.17 44,881 4.49 0.0012
2026-02-17 2025-12-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 646,450 -46,813 -6.75 42,950 -9.88 0.0011
2025-11-14 2025-09-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 693,263 -1,222 -0.18 47,662 3.11 0.0061
2025-08-13 2025-06-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 694,485 -116,857 -14.40 46,225 -9.65 0.0064
2025-05-13 2025-03-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 811,342 -33,175 -3.93 51,163 -4.08 0.0076
2025-02-14 2024-12-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 844,517 79,814 10.44 53,340 16.66 0.0076
2024-11-13 2024-09-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 764,703 -8,029 -1.04 45,722 3.42 0.0075
2024-08-14 2024-06-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 772,732 -1,617,549 -67.67 44,208 -67.06 0.0074
2024-05-14 2024-03-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 2,390,281 1,553,590 185.68 134,190 195.25 0.0232
2024-02-13 2023-12-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 836,691 20,258 2.48 45,449 28.45 0.0082
2023-11-13 2023-09-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 816,433 -9,035 -1.09 35,384 -3.02 0.0069
2023-08-11 2023-06-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 825,468 -4,458 -0.54 36,486 2.67 0.0070
2023-05-15 2023-03-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 829,926 -10,430 -1.24 35,537 -7.59 0.0070
2023-02-13 2022-12-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 840,356 -7,650 -0.90 38,455 6.70 0.0081
2022-11-14 2022-09-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 848,006 -13,409 -1.56 36,040 4.39 0.0082
2022-08-12 2022-06-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 861,415 -7,177 -0.83 34,526 -5.83 0.0074
2022-05-13 2022-03-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 868,592 -29,194 -3.25 36,663 -3.66 0.0064
2022-02-08 2021-12-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 897,786 -19,967 -2.18 38,056 -0.42 0.0062
2021-11-15 2021-09-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 917,753 -24,590 -2.61 38,216 -5.56 0.0068
2021-08-13 2021-06-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 942,343 -15,388 -1.61 40,464 -8.98 0.0071
2021-05-12 2021-03-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 957,731 -197,448 -17.09 44,457 2.79 0.0083
2021-02-11 2020-12-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 1,155,179 -32,153 -2.71 43,249 39.77 0.0084
2020-11-16 2020-09-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 1,187,332 -34,754 -2.84 30,942 -20.93 0.0068
2020-08-14 2020-06-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 1,222,086 -12,329 -1.00 39,131 17.93 0.0093
2020-05-14 2020-03-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 1,234,415 -327 -0.03 33,181 -37.61 0.0095
2020-02-14 2019-12-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 1,234,742 -16,429 -1.31 53,179 10.05 0.0119
2019-11-13 2019-09-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 1,251,171 38,844 3.20 48,321 5.70 0.0116
2019-08-13 2019-06-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 1,212,327 15,652 1.31 45,716 0.45 0.0108
2019-05-13 2019-03-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 1,196,675 9,006 0.76 45,509 11.39 0.0112
2019-02-12 2018-12-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 1,187,669 -581 -0.05 40,856 -23.59 0.0115
2018-11-14 2018-09-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 1,188,250 -6,392 -0.54 53,472 4.58 0.0131
2018-09-18 2018-06-30 13F/A-1 INTERNATIONAL BANCSHARES COR COM 459044103 1,194,642 -709,718 -37.27 51,131 -30.98 0.0130
2018-08-14 2018-06-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 1,198,960 -705,400 51,316
2018-05-09 2018-03-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 1,904,360 -1,665 -0.09 74,080 -2.10 0.0193
2018-02-14 2017-12-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 1,906,025 -40,659 -2.09 75,669 -3.07 0.0192
2017-11-13 2017-09-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 1,946,684 -7,213 -0.37 78,062 13.99 0.0203
2017-08-11 2017-06-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 1,953,897 25,918 1.34 68,484 0.34 0.0191
2017-05-12 2017-03-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 1,927,979 18,454 0.97 68,251 -12.40 0.0197
2017-02-13 2016-12-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 1,909,525 12,879 0.68 77,910 37.94 0.0239
2016-11-09 2016-09-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 1,896,646 25,434 1.36 56,483 15.70 0.0176
2016-08-12 2016-06-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 1,871,212 10,617 0.57 48,820 6.40 0.0158
2016-08-19 2016-03-31 13F/A-1 INTERNATIONAL BANCSHARES COR COM 459044103 1,860,595 11,086 0.60 45,882 -3.47 0.0152
2016-05-13 2016-03-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 1,860,595 45,882
2016-02-12 2015-12-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 1,849,509 -38,469 -2.04 47,533 0.59 0.0158
2015-11-12 2015-09-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 1,887,978 1,887,978 0.00 47,256 0.0158
2015-08-13 2015-06-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 0 -1,929,246 -100.00 0 -100.00
2015-05-14 2015-03-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 1,929,246 35,327 1.87 50,218 -0.09 0.0151
2015-02-12 2014-12-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 1,893,919 -14,533 -0.76 50,265 6.78 0.0152
2014-11-13 2014-09-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 1,908,452 -6,177 -0.32 47,072 -8.94 0.0148
2014-08-14 2014-06-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 1,914,629 -45,703 -2.33 51,695 5.15 0.0161
2014-05-14 2014-03-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 1,960,332 -62,189 -3.07 49,165 -7.78 0.0155
2014-02-21 2013-12-31 13F/A-1 INTERNATIONAL BANCSHARES COR COM 459044103 2,022,521 16,865 0.84 53,313 22.95 0.0171
2014-02-12 2013-12-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 2,022,521 53,313
2013-11-13 2013-09-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 2,005,656 64,877 3.34 43,363 -1.05 0.0153
2013-08-09 2013-06-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 1,940,779 1,940,779 43,823 0.0159
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.