International Bancshares Corporation
US ˙ NasdaqGS ˙ US4590441030

SecurityIBOC / International Bancshares Corporation
InstitutionAlliancebernstein L.p.
Latest Disclosed Ownership219,967 shares
Latest Disclosed Value $ 14,614,607
Alliancebernstein L.p. reports 19.73% decrease in ownership of IBOC / International Bancshares Corporation

On May 15, 2026 - Alliancebernstein L.p. filed a 13F-HR form disclosing ownership of 219,967 shares of International Bancshares Corporation (US:IBOC) valued at $14,801,579 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 274,018 shares of International Bancshares Corporation. This represents a change in shares of -19.73% during the quarter. The current value of the position is $15,617,657 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.

Upgrade to unlock premium data and export to Excel .

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 219,967 -54,051 -19.73 14,615 -19.73 0.0047
2026-02-17 2025-12-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 274,018 49,499 22.05 18,206 17.95 0.0057
2025-11-14 2025-09-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 224,519 39,812 21.55 15,436 25.55 0.0049
2025-08-14 2025-06-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 184,707 -1,210 -0.65 12,294 4.87 0.0040
2025-05-15 2025-03-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 185,917 8,189 4.61 11,724 4.44 0.0042
2025-02-12 2024-12-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 177,728 -4,370 -2.40 11,225 3.10 0.0038
2024-11-14 2024-09-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 182,098 -1,876 -1.02 10,888 3.44 0.0037
2024-08-14 2024-06-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 183,974 -1,450 -0.78 10,525 1.11 0.0037
2024-05-14 2024-03-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 185,424 -9,656 -4.95 10,410 -1.76 0.0037
2024-02-14 2023-12-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 195,080 653 0.34 10,597 25.75 0.0041
2023-11-14 2023-09-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 194,427 -1,834 -0.93 8,426 -2.86 0.0036
2023-08-15 2023-06-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 196,261 -4,056 -2.02 8,675 1.13 0.0035
2023-05-15 2023-03-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 200,317 506 0.25 8,578 -6.19 0.0037
2023-02-15 2022-12-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 199,811 273 0.14 9,143 7.82 0.0041
2022-11-15 2022-09-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 199,538 -3,428 -1.69 8,480 4.24 0.0041
2022-08-15 2022-06-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 202,966 550 0.27 8,135 -4.79 0.0037
2022-05-13 2022-03-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 202,416 -2,849 -1.39 8,544 -1.80 0.0033
2022-02-14 2021-12-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 205,265 -7,292 -3.43 8,701 -1.69 0.0031
2021-11-10 2021-09-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 212,557 -5,192 -2.38 8,851 -5.34 0.0035
2021-07-30 2021-06-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 217,749 -960 -0.44 9,350 -7.90 0.0038
2021-05-06 2021-03-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 218,709 -618 -0.28 10,152 23.62 0.0045
2021-02-08 2020-12-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 219,327 -2,527 -1.14 8,212 42.03 0.0039
2020-11-12 2020-09-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 221,854 -21,517 -8.84 5,782 -25.81 0.0031
2020-08-13 2020-06-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 243,371 1,829 0.76 7,793 20.02 0.0046
2020-05-14 2020-03-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 241,542 1,260 0.52 6,493 -37.26 0.0047
2020-02-18 2019-12-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 240,282 -2,780 -1.14 10,349 10.25 0.0059
2019-11-14 2019-09-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 243,062 2,260 0.94 9,387 3.37 0.0058
2019-08-14 2019-06-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 240,802 -2,810 -1.15 9,081 -1.99 0.0056
2019-05-14 2019-03-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 243,612 -6,620 -2.65 9,265 7.63 0.0060
2019-02-13 2018-12-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 250,232 46,093 22.58 8,608 -6.29 0.0064
2018-11-08 2018-09-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 204,139 -30,151 -12.87 9,186 -8.40 0.0060
2018-08-13 2018-06-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 234,290 41,550 21.56 10,028 33.74 0.0070
2018-05-14 2018-03-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 192,740 -4,200 -2.13 7,498 -4.11 0.0054
2018-02-13 2017-12-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 196,940 -4,470 -2.22 7,819 -3.19 0.0056
2017-11-13 2017-09-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 201,410 -60 -0.03 8,077 14.37 0.0060
2017-08-10 2017-06-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 201,470 15,720 8.46 7,062 7.39 0.0055
2017-05-11 2017-03-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 185,750 -32,310 -14.82 6,576 -26.09 0.0052
2017-02-13 2016-12-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 218,060 -49,410 -18.47 8,897 11.70 0.0074
2016-11-10 2016-09-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 267,470 106,420 66.08 7,965 89.55 0.0067
2016-08-11 2016-06-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 161,050 50,470 45.64 4,202 54.09 0.0036
2016-05-13 2016-03-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 110,580 18,970 20.71 2,727 15.85 0.0023
2016-02-16 2015-12-31 13F/A-1 INTERNATIONAL BANCSHARES COR COM 459044103 91,610 -12,020 -11.60 2,354 -9.25 0.0020
2016-02-12 2015-12-31 13F INTERNATIONAL BANCSHARES COR COM 459044103 91,610 2,293
2015-11-13 2015-09-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 103,630 -2,430 -2.29 2,594 -8.98 0.0022
2015-08-14 2015-06-30 13F INTERNATIONAL BANCSHARES COR COM 459044103 106,060 -150 -0.14 2,850 3.07 0.0024
2015-05-13 2015-03-31 13F INTERNATIONAL BANCSHARES COM 459044103 106,210 -50 -0.05 2,765 -1.95 0.0022
2015-02-13 2014-12-31 13F INTERNATIONAL BANCSHARES COM 459044103 106,260 -2,550 -2.34 2,820 5.07 0.0023
2014-11-13 2014-09-30 13F INTERNATIONAL BANCSHARES COM 459044103 108,810 -3,620 -3.22 2,684 -11.59 0.0023
2014-08-13 2014-06-30 13F INTERNATIONAL BANCSHARES COM 459044103 112,430 16,850 17.63 3,036 26.66 0.0026
2014-05-13 2014-03-31 13F INTERNATIONAL BANCSHARES COM 459044103 95,580 -1,180 -1.22 2,397 -6.11 0.0021
2014-02-13 2013-12-31 13F INTERNATIONAL BANCSHARES COM 459044103 96,760 -10,900 -10.12 2,553 9.62 0.0023
2013-11-14 2013-09-30 13F INTERNATIONAL BANCSHARES COM 459044103 107,660 6 0.01 2,329 -4.20 0.0023
2013-08-13 2013-06-30 13F INTERNATIONAL BANCSHARES COM 459044103 107,654 107,654 2,431 0.0026
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.