Ranked by reported Q2 2026 13F market value
Share of total reported institutional value in IBOC held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 7.0M | $535.3M | +6.1% | 11.335% | 0.01% |
| 2 | VANGUARD PORTFOLIO MANAGEMENT LLC | 3.4M | $254.4M | -1.5% | 5.388% | 0.01% |
| 3 | DIMENSIONAL FUND ADVISORS LP | 3.3M | $247.5M | +2.3% | 5.241% | 0.04% |
| 4 | AMERICAN CENTURY COMPANIES INC | 3.1M | $237.6M | -3.1% | 5.031% | 0.11% |
| 5 | STATE STREET CORP | 2.8M | $213.5M | +7.1% | 4.520% | 0.00% |
| 6 | VANGUARD CAPITAL MANAGEMENT LLC | 2.5M | $189.6M | +0.9% | 4.014% | 0.00% |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | 1.6M | $119.5M | +5.5% | 2.530% | 0.01% |
| 8 | Boston Trust Walden Corp | 1.3M | $99.2M | +20.1% | 2.101% | 0.76% |
| 9 | GOLDMAN SACHS GROUP INC | 1.0M | $78.7M | +12.1% | 1.666% | 0.01% |
| 10 | Azora Capital LP | 886K | $67.3M | -32.5% | 1.425% | 2.83% |
| 11 | FIRST TRUST ADVISORS LP | 821K | $62.3M | -27.8% | 1.320% | 0.04% |
| 12 | NORTHERN TRUST CORP | 751K | $57.0M | +12.6% | 1.208% | 0.01% |
| 13 | REINHART PARTNERS, LLC. | 750K | $56.9M | +0.5% | 1.206% | 1.30% |
| 14 | Tamar Securities, LLC | 721K | $54.8M | -4.7% | 1.160% | 5.12% |
| 15 | NORGES BANK | 700K | $53.2M | — | 1.126% | 0.01% |
| 16 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 695K | $52.8M | -1.3% | 1.117% | 0.01% |
| 17 | MILLENNIUM MANAGEMENT LLC | 651K | $49.4M | -8.6% | 1.047% | 0.02% |
| 18 | AQR CAPITAL MANAGEMENT LLC | 588K | $44.6M | +18.5% | 0.945% | 0.02% |
| 19 | Bank of New York Mellon Corp | 437K | $33.2M | -2.6% | 0.702% | 0.01% |
| 20 | PANAGORA ASSET MANAGEMENT INC | 423K | $32.1M | +9.7% | 0.681% | 0.10% |
| 21 | ProShare Advisors LLC | 378K | $28.7M | +2.9% | 0.607% | 0.04% |
| 22 | VANGUARD FIDUCIARY TRUST CO | 366K | $27.8M | +2.8% | 0.588% | 0.01% |
| 23 | Polaris Capital Management, LLC | 321K | $24.4M | -30.6% | 0.516% | 2.30% |
| 24 | BANK OF AMERICA CORP /DE/ | 311K | $23.6M | +59.9% | 0.500% | 0.00% |
| 25 | TWO SIGMA INVESTMENTS, LP | 307K | $23.3M | +82.0% | 0.493% | 0.02% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in IBOC — a direct measure of their conviction.
Filings activity in IBOC during Q2 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q2 2026 | 302 | +3.1% | 71.20% | +2.30 pp | $3.17B | +16% |
| Q1 2026 | 293 | +12% | 68.90% | 0.14 pp | $2.72B | 0.9% |
| Q4 2025 | 262 | +5.6% | 69.04% | +1.05 pp | $2.75B | 0.8% |
| Q3 2025 | 248 | 1.2% | 67.99% | 0.62 pp | $2.77B | +2.0% |
| Q2 2025 | 251 | +1.2% | 68.61% | +1.47 pp | $2.72B | +7.1% |
| Q1 2025 | 248 | +3.3% | 67.14% | 0.36 pp | $2.54B | 0.5% |
| Q4 2024 | 240 | +3.4% | 67.50% | +2.40 pp | $2.55B | +9.6% |
| Q3 2024 | 232 | — | 65.10% | — | $2.33B | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying IBOC stock.
Based on Q2 2026 13F filings, institutional ownership of International Bancshares Corporation stands at 71.2%, held across 302 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of IBOC, with approximately 7,048,194 shares worth $0.54B as of Q2 2026.
Yes — 2 widely-followed marquee investors appear among the top 25 institutional holders of IBOC, including MILLENNIUM MANAGEMENT LLC, TWO SIGMA INVESTMENTS, LP.
Our composite Smart Money Score for IBOC is 68 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
34 institutions opened new positions in IBOC during Q2 2026, while 24 fully exited. 222 added to existing positions and 39 trimmed.
IBOC institutional ownership rose by 2.30 percentage points quarter-over-quarter, with a net change of +9 holders.
The top 10 institutions account for 64.4% of all reported 13F value in IBOC, and the top 25 account for 84.1%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
International Bancshares Corporation (IBOC) Institutional Ownership