As of November 7, 2026, Westamerica BanCorp is a publicly traded company (Nasdaq: WABC); its largest reported holder is American Century Investments, with 8.3% on Schedule 13G/A of August 14, 2026, then Vanguard (7.33%). The largest insider holding is George S. Ensinger, the senior vice president and human resources div. mgr, with 7,492.9 shares (0.03% of shares outstanding), per Form 4 of March 2, 2026 (Schedule 13G/A, August 14, 2026).
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Is Westamerica BanCorp a real, registered company?
- Westamerica BanCorp files with the SEC under CIK 311094 (its SEC filings).
- Its shares are listed under the ticker WABC on Nasdaq (SEC company record).
- Incorporated in California; business address in San Rafael, California, as its SEC filings state.
- Court and bankruptcy records: see Before you sign or pay below.
Before you sign or pay
- Court and bankruptcy: No federal court case or bankruptcy filing found under Westamerica BanCorp in our court records and SEC 8-K records (as of 2026-11-07).
- Ownership: 5%+ holders are reported on Schedule 13D or 13G; the latest names American Century Investments (filed 2026-08-14).
Who are Westamerica BanCorp's owners and officers?
Westamerica BanCorp: incorporated in California; business address in San Rafael, California; industry National Commercial Banks (Schedule 13G/A, 2026-10-30).
| Report | Holder | Share |
|---|---|---|
| Schedule 13G/A, 2026-10-30 | Vanguard Capital Management | 4.9% |
| Schedule 13G/A, 2026-08-14 | American Century Investment Management, Inc. | 8.3% |
| Schedule 13G, 2026-08-07 | State Street Corporation | 5.9% |
| Schedule 13G, 2026-04-30 | Vanguard Capital Management | 5.28% |
| Schedule 13G, 2026-04-29 | Vanguard Portfolio Management | 7.33% |
| Schedule 13G/A, 2026-03-27 | The Vanguard Group | 0% |
Questions about who owns Westamerica BanCorp
Who owns Westamerica BanCorp?
On this page, 3 holders' latest ownership filings report 5% or more of Westamerica BanCorp: American Century Investment Management, Inc. (8.3%, Schedule 13G/A, filed 2026-08-14), Vanguard Portfolio Management (7.33%, Schedule 13G, filed 2026-04-29) and State Street Corporation (5.9%, Schedule 13G, filed 2026-08-07).
Who are the largest shareholders of Westamerica BanCorp?
By the share each holder's latest filing reports, the largest holders of Westamerica BanCorp on this page are American Century Investment Management, Inc. (8.3%), Vanguard Portfolio Management (7.33%) and State Street Corporation (5.9%).
When did American Century Investment Management, Inc. buy into Westamerica BanCorp?
The filings give report dates, not purchase dates. The earliest filing from American Century Investment Management, Inc. on this page is the Schedule 13G/A, filed 2026-08-14, reporting 8.3%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 6 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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What They Do, And How The Money Works
Who Runs It, And How To Reach Them
The Money: Funding, Valuation, Runway
Who Pays Them, And Who They Are Up Against
Warning Bells
Sources
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Which insiders own Westamerica BanCorp shares?
Directors, officers and holders of 10% or more report their shares on Forms 3, 4 and 5. Each line is the latest such report, largest holding first.
- , the senior vice president and human resources div. mgr: 7,492.9 shares (0.03% of shares outstanding), 6,831.2 held directly and 661.7 indirectly (Form 4, 2026-03-02).
- , the senior vice president and treasurer: 4,527.7 shares (0.02% of shares outstanding), 2,595 held directly and 1,932.7 indirectly (Form 4, 2025-07-11).
- , the senior vice president and banking division manager: 3,800.76 shares (0.02% of shares outstanding), held indirectly (the form does not name the holder) (Form 4, 2026-07-20).
- , the chief financial officer and senior vice president: 2,762 shares (0.01% of shares outstanding), 235.55 held directly and 2,526.45 indirectly (Form 4, 2026-02-25).
- , the senior vice president and chief information officer: 2,322.02 shares (0.01% of shares outstanding), 46.84 held directly and 2,275.18 indirectly (Form 4, 2026-07-20).
Shares outstanding: 23,097,337 as of 2026-10-30, from the company's latest SEC cover page.
How much has Westamerica BanCorp raised?
No fundraising or offering filing from Westamerica BanCorp is on file with us.
Keep reading
More on Westamerica BanCorp and the records around it.
Companies that share a holder
- American Century Investment Management, Inc. also filed stake reports on 83 other companies: Visteon Corporation (Oct 2026), MarineMax, Inc. (Sep 2026), AdvanSix Inc. (Aug 2026)
- STATE STREET CORPORATION also filed stake reports on 343 other companies: TRADE DESK INC/THE (Oct 2026), CENTRUS ENERGY CORP (Sep 2026), ACADIA PHARMACEUTICALS INC (Aug 2026)
- Vanguard Portfolio Management also filed stake reports on 941 other companies: Newmark Group Inc (Nov 2026), A10 Networks Inc (Oct 2026), ADT Inc (Oct 2026)
Related pages
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