300 institutional investment managers reported IBOC positions in their Form 13F filings for Q2 2026, holding 44,253,436 shares worth $3.4B in total. BlackRock, Inc. reported the largest position.

Are funds buying or selling IBOC?

In Q2 2026, 37 managers opened new IBOC positions, 122 added, 84 trimmed and 25 sold out. Managers that filed in both quarters added a net 1,424,548 shares.

How current is this IBOC institutional ownership data?

It covers holdings as of the end of Q2 2026. Managers have 45 days after the quarter ends to file Form 13F (by August 14, 2026 for Q2 2026), so positions may have changed since.

Funds · IBOC

Who owns IBOC?

Institutional ownership of International Bancshares Corporation from Form 13F, Q2 2026

300 institutional managers reported holding International Bancshares Corporation (IBOC) in Form 13F filings for Q2 2026, with 44,253,436 shares worth $3.4B. The largest reported holder was BlackRock, Inc. Managers that filed both quarters added a net 1,424,548 shares (+3.3%). 37 opened new positions and 25 sold out.

Funds holding: 300
Value held: $3.4B
New / sold out: 37 / 25
Net shares, same filers: +3.3%

Holdings as of June 30, 2026, the end of Q2 2026. Managers have 45 days after a quarter ends to file Form 13F (by August 14, 2026 for Q2 2026), so positions may have changed since.

Largest holders of IBOC

Fund	Value	Share of 13F holdings	Shares	Move
BlackRock, Inc.	$535M	15.9%	7,048,194	Added
Vanguard Portfolio Management LLC	$254M	7.6%	3,350,198	Trimmed
Dimensional Fund Advisors LP	$247M	7.4%	3,258,656	Added
American Century Companies Inc	$238M	7.1%	3,128,416	Trimmed
State Street Corp	$213M	6.4%	2,810,776	Added
Vanguard Capital Management LLC	$190M	5.6%	2,495,909	Added
Geode Capital Management, LLC	$120M	3.6%	1,573,378	Added
Boston Trust Walden Corp	$99.2M	3.0%	1,306,605	Added
T. Rowe Price Investment Management, Inc.	$88.2M	2.6%	1,161,106	Trimmed
Goldman Sachs Group Inc	$78.7M	2.3%	1,035,745	Added
Azora Capital LP	$67.3M	2.0%	885,768	Trimmed
Price T Rowe Associates Inc	$63.8M	1.9%	839,850	Added
First Trust Advisors LP	$62.3M	1.9%	820,840	Trimmed
Northern Trust Corp	$57.0M	1.7%	750,864	Added
Reinhart Partners, LLC.	$56.9M	1.7%	749,761	Added
Tamar Securities, LLC	$54.8M	1.6%	721,211	Trimmed
Norges Bank	$53.2M	1.6%	700,374	New
Charles Schwab Investment Management Inc	$52.8M	1.6%	694,616	Trimmed
Millennium Management LLC	$49.4M	1.5%	650,775	Trimmed
AQR Capital Management LLC	$44.6M	1.3%	587,610	Added
Bank of New York Mellon Corp	$33.2M	1.0%	436,744	Trimmed
Panagora Asset Management Inc	$32.1M	1.0%	423,256	Added
ProShare Advisors LLC	$28.7M	0.9%	377,605	Added
Vanguard Fiduciary Trust Co	$27.8M	0.8%	365,865	Added
Polaris Capital Management, LLC	$24.4M	0.7%	321,100	Trimmed

Share of 13F holdings is each fund's shares as a share of the 44,253,436 IBOC shares all 13F filers reported, not of shares outstanding.

Biggest buyers in Q2 2026

Norges Bank New+$53.2M
BlackRock, Inc. Added+$30.6M
Price T Rowe Associates Inc Added+$22.4M
Boston Trust Walden Corp Added+$16.6M
Walleye Capital LLC New+$15.2M
State Street Corp Added+$14.1M
Mackenzie Financial Corp Added+$13.6M
Two Sigma Investments, LP Added+$10.5M
Bank of America Corp Added+$8.8M
Goldman Sachs Group Inc Added+$8.5M

Biggest sellers in Q2 2026

Azora Capital LP Trimmed-$32.4M
First Trust Advisors LP Trimmed-$24.1M
Polaris Capital Management, LLC Trimmed-$10.8M
Qube Research & Technologies Ltd Sold out-$9.3M
HRT Financial LP Sold out-$9.1M
Jane Street Group, LLC Trimmed-$8.9M
American Century Companies Inc Trimmed-$7.6M
Invesco Ltd. Trimmed-$6.7M
BW Gestao de Investimentos Ltda. Sold out-$6.1M
Millennium Management LLC Trimmed-$4.7M

The change in shares since the quarter before, adjusted for stock splits and priced at the Q2 2026 value per share. Funds bought $297M and sold $185M; 122 added and 84 trimmed.

Schedule 13D and 13G filings on IBOC

Owners of more than 5% must file within days, so these can be newer than the 13F data.

2026-04-29VANGUARD PORTFOLIO MANAGEMENT LLC SCHEDULE 13G filed by International Bancshares CorporationSchedule 13G
2026-02-13AMERICAN CENTURY INVESTMENT MANAGEMENT INC SCHEDULE 13G filed by International Bancshares CorporationSchedule 13G

Questions about IBOC ownership

Who owns IBOC stock?: 300 institutional investment managers reported IBOC positions in their Form 13F filings for Q2 2026, holding 44,253,436 shares worth $3.4B in total. BlackRock, Inc. reported the largest position.
Are funds buying or selling IBOC?: In Q2 2026, 37 managers opened new IBOC positions, 122 added, 84 trimmed and 25 sold out. Managers that filed in both quarters added a net 1,424,548 shares.
How current is this IBOC institutional ownership data?: It covers holdings as of the end of Q2 2026. Managers have 45 days after the quarter ends to file Form 13F (by August 14, 2026 for Q2 2026), so positions may have changed since.

From the SEC's Form 13F data sets for Q2 2026: every 13F holdings report, matched to IBOC by CUSIP. Options are left out. IBOC news and filings · IBOC insider trades · Top funds