Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in WABC held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 3.4M | $179.9M | -1.4% | 13.881% | 0.00% |
| 2 | AMERICAN CENTURY COMPANIES INC | 1.9M | $99.4M | +3.9% | 7.674% | 0.05% |
| 3 | VANGUARD PORTFOLIO MANAGEMENT LLC | 1.8M | $91.8M | — | 7.081% | 0.00% |
| 4 | STATE STREET CORP | 1.2M | $62.8M | -1.5% | 4.842% | 0.00% |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 1.1M | $57.1M | — | 4.407% | 0.00% |
| 6 | DIMENSIONAL FUND ADVISORS LP | 945K | $49.3M | +5.3% | 3.802% | 0.01% |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | 613K | $32.0M | +1.1% | 2.468% | 0.00% |
| 8 | AQR CAPITAL MANAGEMENT LLC | 399K | $20.8M | +4.5% | 1.606% | 0.01% |
| 9 | Nuveen, LLC | 359K | $18.7M | +1.3% | 1.446% | 0.01% |
| 10 | TWO SIGMA INVESTMENTS, LP | 353K | $18.4M | +90.1% | 1.421% | 0.01% |
| 11 | PALISADE CAPITAL MANAGEMENT LLC/NJ | 305K | $15.9M | -4.3% | 1.227% | 0.53% |
| 12 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 298K | $15.5M | -0.2% | 1.199% | 0.00% |
| 13 | NORTHERN TRUST CORP | 289K | $15.1M | +0.5% | 1.163% | 0.00% |
| 14 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 284K | $14.8M | -3.9% | 1.142% | 0.01% |
| 15 | RBO & CO LLC | 282K | $14.7M | -1.6% | 1.136% | 2.38% |
| 16 | MORGAN STANLEY | 255K | $13.3M | -13.4% | 1.027% | 0.00% |
| 17 | GOLDMAN SACHS GROUP INC | 227K | $11.8M | -12.6% | 0.912% | 0.00% |
| 18 | Bank of New York Mellon Corp | 210K | $10.9M | +0.5% | 0.843% | 0.00% |
| 19 | Qube Research & Technologies Ltd | 171K | $8.9M | -25.0% | 0.690% | 0.01% |
| 20 | VANGUARD FIDUCIARY TRUST CO | 160K | $8.3M | — | 0.644% | 0.00% |
| 21 | UBS Group AG | 160K | $8.3M | -65.0% | 0.643% | 0.00% |
| 22 | RENAISSANCE TECHNOLOGIES LLC | 152K | $7.9M | +59.6% | 0.613% | 0.01% |
| 23 | PRINCIPAL FINANCIAL GROUP INC | 151K | $7.9M | +3.9% | 0.608% | 0.00% |
| 24 | Leeward Investments, LLC - MA | 138K | $7.2M | -2.6% | 0.556% | 0.36% |
| 25 | Invesco Ltd. | 132K | $6.9M | +16.3% | 0.532% | 0.00% |
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 WABC — a direct measure of their conviction.
Filings activity in WABC during Q1 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 |
|---|---|---|---|---|---|---|
| Q1 2026 | 198 | 6.2% | 65.16% | +1.34 pp | $942M | +2.1% |
| Q4 2025 | 211 | +0.0% | 63.82% | 1.89 pp | $922M | 2.9% |
| Q3 2025 | 211 | +3.9% | 65.71% | +1.36 pp | $949M | +2.1% |
| Q2 2025 | 203 | 1.5% | 64.35% | 4.91 pp | $930M | 7.1% |
| Q1 2025 | 206 | +0.5% | 69.26% | 1.85 pp | $1.00B | 2.6% |
| Q4 2024 | 205 | +6.8% | 71.11% | +5.15 pp | $1.03B | +7.8% |
| Q3 2024 | 192 | +1.1% | 65.96% | +0.76 pp | $953M | +1.2% |
| Q2 2024 | 190 | — | 65.20% | — | $942M | — |
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 WABC stock.
Based on Q1 2026 13F filings, institutional ownership of Westamerica Bancorporation stands at 65.2%, held across 198 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of WABC, with approximately 3,449,335 shares worth $0.18B as of Q1 2026.
Yes — 2 widely-followed marquee investors appear among the top 25 institutional holders of WABC, including TWO SIGMA INVESTMENTS, LP, RENAISSANCE TECHNOLOGIES LLC.
Our composite Smart Money Score for WABC is 58 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
22 institutions opened new positions in WABC during Q1 2026, while 35 fully exited. 131 added to existing positions and 42 trimmed.
WABC institutional ownership rose by 1.34 percentage points quarter-over-quarter, with a net change of -13 holders.
The top 10 institutions account for 66.9% of all reported 13F value in WABC, and the top 25 account for 84.7%.
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.
Westamerica Bancorporation (WABC) Institutional Ownership