Ranked by reported Q1 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. | 6.6M | $447.1M | -1.0% | 10.687% | 0.01% |
| 2 | VANGUARD PORTFOLIO MANAGEMENT LLC | 3.4M | $228.9M | β | 5.471% | 0.01% |
| 3 | AMERICAN CENTURY COMPANIES INC | 3.2M | $217.3M | +0.9% | 5.192% | 0.11% |
| 4 | DIMENSIONAL FUND ADVISORS LP | 3.2M | $214.4M | +0.3% | 5.125% | 0.04% |
| 5 | STATE STREET CORP | 2.6M | $176.6M | +6.6% | 4.221% | 0.01% |
| 6 | VANGUARD CAPITAL MANAGEMENT LLC | 2.5M | $166.5M | β | 3.980% | 0.00% |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | 1.5M | $100.3M | +3.9% | 2.398% | 0.01% |
| 8 | Azora Capital LP | 1.3M | $88.3M | -13.9% | 2.111% | 5.81% |
| 9 | FIRST TRUST ADVISORS LP | 1.1M | $76.5M | -16.6% | 1.829% | 0.05% |
| 10 | Boston Trust Walden Corp | 1.1M | $73.2M | -8.7% | 1.749% | 0.60% |
| 11 | GOLDMAN SACHS GROUP INC | 924K | $62.2M | +56.5% | 1.486% | 0.01% |
| 12 | Tamar Securities, LLC | 757K | $50.9M | +2.5% | 1.217% | 5.45% |
| 13 | REINHART PARTNERS, INC. | 746K | $50.2M | +0.9% | 1.199% | 1.44% |
| 14 | MILLENNIUM MANAGEMENT LLC | 712K | $47.9M | +28.7% | 1.146% | 0.03% |
| 15 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 704K | $47.4M | -69.1% | 1.132% | 0.01% |
| 16 | NORTHERN TRUST CORP | 667K | $44.9M | +3.2% | 1.073% | 0.01% |
| 17 | AQR CAPITAL MANAGEMENT LLC | 496K | $33.4M | -1.1% | 0.797% | 0.02% |
| 18 | Polaris Capital Management, LLC | 463K | $31.2M | -3.0% | 0.745% | 2.55% |
| 19 | Bank of New York Mellon Corp | 448K | $30.2M | -0.8% | 0.721% | 0.01% |
| 20 | PANAGORA ASSET MANAGEMENT INC | 386K | $26.0M | -0.5% | 0.621% | 0.10% |
| 21 | Invesco Ltd. | 386K | $26.0M | +44.2% | 0.620% | 0.00% |
| 22 | ProShare Advisors LLC | 367K | $24.7M | -27.0% | 0.590% | 0.04% |
| 23 | VANGUARD FIDUCIARY TRUST CO | 356K | $24.0M | β | 0.573% | 0.01% |
| 24 | MORGAN STANLEY | 296K | $19.9M | -1.5% | 0.476% | 0.00% |
| 25 | ALLIANCEBERNSTEIN L.P. | 220K | $14.6M | -19.7% | 0.354% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). β% of Fundβ shows how much of that investorβs total 13F portfolio is invested in IBOC β a direct measure of their conviction.
Filings activity in IBOC during Q1 2026, grouped by how each filer changed its position.
Institutions that opened a new IBOC position in Q1 2026
Institutions that fully closed their IBOC position in Q1 2026
8 quarters of 13F filings Β· Ξ columns show change vs prior quarter
| Quarter | Inst. Holders | Ξ Holders | Ownership % | Ξ Ownership | Total 13F Value | Ξ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 287 | +9.5% | 57.04% | 0.73 pp | $2.71B | 1.3% |
| Q4 2025 | 262 | +5.6% | 57.77% | 0.47 pp | $2.75B | 0.8% |
| Q3 2025 | 248 | 1.2% | 58.24% | +1.15 pp | $2.77B | +2.0% |
| Q2 2025 | 251 | +1.2% | 57.09% | +3.80 pp | $2.72B | +7.1% |
| Q1 2025 | 248 | +3.3% | 53.29% | 0.28 pp | $2.54B | 0.5% |
| Q4 2024 | 240 | +3.4% | 53.57% | +4.67 pp | $2.55B | +9.6% |
| Q3 2024 | 232 | +12% | 48.90% | +1.17 pp | $2.33B | +2.5% |
| Q2 2024 | 208 | β | 47.73% | β | $2.27B | β |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Ξ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying IBOC stock.
Based on Q1 2026 13F filings, institutional ownership of International Bancshares Corporation stands at 57.0%, held across 287 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of IBOC, with approximately 6,645,092 shares worth $0.45B as of Q1 2026.
Yes β 1 widely-followed marquee investor appear among the top 25 institutional holders of IBOC, including MILLENNIUM MANAGEMENT LLC.
Our composite Smart Money Score for IBOC is 53 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
50 institutions opened new positions in IBOC during Q1 2026, while 25 fully exited. 169 added to existing positions and 64 trimmed.
IBOC institutional ownership fell by 0.73 percentage points quarter-over-quarter, with a net change of +25 holders.
The top 10 institutions account for 65.9% of all reported 13F value in IBOC, and the top 25 account for 85.6%.
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