# WESTAMERICA BANCORPORATION COM

WESTAMERICA BANCORPORATION COM is a security (CUSIP 957090103) tracked across SEC portfolio filings. 219 institutional managers reported $937.4M on Form 13F as of 2026-06-30; 18 registered fund positions totaling $35.3M via N-PORT as of 2026-05-31.

## Summary

- Issuer: WESTAMERICA BANCORPORATION
- Class: COM
- CUSIP: 957090103
- Asset category: EC
- 13F holders: 219
- 13F value: $937.4M
- 13F period: 2026-06-30
- N-PORT fund positions: 18
- N-PORT value: $35.3M
- N-PORT report: 2026-05-31

## Top institutional holders (Form 13F)

_Showing 15 of 219 managers by value._

| Manager | Location | Value | Shares |
| --- | --- | --- | --- |
| BlackRock, Inc. | New York, NY | $179.9M | 3,449,335 |
| [VANGUARD GROUP INC](https://search.stillhousedata.com/firm/105958) | Valley Forge, PA | $151.7M | 3,170,769 |
| AMERICAN CENTURY COMPANIES INC | KANSAS CITY, MO | $99.4M | 1,906,870 |
| STATE STREET CORP | BOSTON, MA | $62.8M | 1,203,283 |
| DIMENSIONAL FUND ADVISORS LP | AUSTIN, TX | $49.3M | 944,699 |
| [GEODE CAPITAL MANAGEMENT, LLC](https://search.stillhousedata.com/firm/115504) | BOSTON, MA | $32.0M | 613,162 |
| [AQR CAPITAL MANAGEMENT LLC](https://search.stillhousedata.com/firm/111883) | Greenwich, CT | $20.8M | 399,046 |
| Nuveen, LLC | CHARLOTTE, NC | $18.7M | 359,345 |
| [TWO SIGMA INVESTMENTS, LP](https://search.stillhousedata.com/firm/137137) | New York, NY | $18.4M | 353,032 |
| PALISADE CAPITAL MANAGEMENT, LP | FORT LEE, NJ | $15.9M | 304,954 |
| [CHARLES SCHWAB INVESTMENT MANAGEMENT INC](https://search.stillhousedata.com/firm/106753) | SAN FRANCISCO, CA | $15.5M | 297,925 |
| NORTHERN TRUST CORP | CHICAGO, IL | $15.1M | 288,977 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | BOSTON, MA | $14.8M | 283,809 |
| [RBO & CO LLC](https://search.stillhousedata.com/firm/112172) | ST HELENA, CA | $14.7M | 282,198 |
| MORGAN STANLEY | NEW YORK, NY | $13.3M | 255,156 |

## Top fund holders (N-PORT)

_Showing 15 of 18 fund positions by value._

| Fund | Registrant | Value | % of fund |
| --- | --- | --- | --- |
| [VANGUARD EXTENDED MARKET INDEX FUND](https://search.stillhousedata.com/fund/S000002841) | VANGUARD INDEX FUNDS | $14.3M | 1.76% |
| [VANGUARD RUSSELL 2000 INDEX FUND](https://search.stillhousedata.com/fund/S000030003) | VANGUARD SCOTTSDALE FUNDS | $6.8M | 3.86% |
| [U.S. MICRO CAP PORTFOLIO](https://search.stillhousedata.com/fund/S000000948) | DFA INVESTMENT DIMENSIONS GROUP INC | $5.8M | 7.71% |
| ROYCE SMALL-CAP TRUST, INC. | ROYCE SMALL-CAP TRUST, INC. | $2.2M | 10.04% |
| [Master Small Cap Index Series](https://search.stillhousedata.com/fund/S000002716) | Quantitative Master Series LLC | $2.1M | 4.26% |
| [VANGUARD MARKET NEUTRAL FUND](https://search.stillhousedata.com/fund/S000019457) | VANGUARD MONTGOMERY FUNDS | $798K | 18.49% |
| [VANGUARD BALANCED INDEX FUND](https://search.stillhousedata.com/fund/S000002560) | VANGUARD VALLEY FORGE FUNDS | $752K | 0.13% |
| [BNY Mellon Smallcap Stock Index Fund](https://search.stillhousedata.com/fund/S000000132) | BNY MELLON INDEX FUNDS, INC. | $679K | 8.01% |
| [VANGUARD INSTITUTIONAL TOTAL STOCK MARKET INDEX FUND](https://search.stillhousedata.com/fund/S000002855) | VANGUARD INSTITUTIONAL INDEX FUNDS | $633K | 0.21% |
| [Goldman Sachs ActiveBeta(R) U.S. Small Cap Equity ETF](https://search.stillhousedata.com/fund/S000048296) | Goldman Sachs ETF Trust | $501K | 5.08% |
| [Strategic Allocation: Aggressive Fund](https://search.stillhousedata.com/fund/S000005931) | American Century Strategic Asset Allocations Inc | $251K | 3.41% |
| [Bridge Builder Tax Managed Small/Mid Cap Fund](https://search.stillhousedata.com/fund/S000076295) | Bridge Builder Trust | $203K | 0.67% |
| [DWS Small Cap Index VIP](https://search.stillhousedata.com/fund/S000006223) | DEUTSCHE DWS INVESTMENTS VIT FUNDS | $173K | 4.13% |
| [Vericimetry U.S. Small Cap Value Fund](https://search.stillhousedata.com/fund/S000033942) | VERICIMETRY FUNDS | $85K | 5.06% |
| [Blackstone Alternative Multi-Strategy Fund](https://search.stillhousedata.com/fund/S000045538) | Blackstone Alternative Investment Funds | $47K | 0.13% |

## More

- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/security/957090103.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

---

Source: public SEC filing data via Adviser Search (https://search.stillhousedata.com).
Agents: this data is also queryable via MCP tools and read-only SQL — see https://search.stillhousedata.com/llms.txt.