Westamerica Bancorporation
US ˙ NasdaqGS ˙ US9570901036

SecurityWABC / Westamerica Bancorporation
InstitutionRenaissance Technologies Llc
ManagerJames Simons
Latest Disclosed Ownership152,431 shares
Latest Disclosed Value $ 7,949,277
Renaissance Technologies Llc reports 59.56% increase in ownership of WABC / Westamerica Bancorporation

On May 14, 2026 - Renaissance Technologies Llc filed a 13F-HR form disclosing ownership of 152,431 shares of Westamerica Bancorporation (US:WABC) valued at $7,949,277 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 95,531 shares of Westamerica Bancorporation. This represents a change in shares of 59.56% during the quarter. The current value of the position is $8,624,546 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-14 2026-03-31 13F WESTAMERICA BANCORPORATION COM 957090103 152,431 56,900 59.56 7,949 73.98 0.0124
2026-02-12 2025-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 95,531 6,000 6.70 4,569 2.10 0.0071
2025-11-13 2025-09-30 13F WESTAMERICA BANCORPORATION COM 957090103 89,531 -63,800 -41.61 4,476 -39.75 0.0059
2025-08-13 2025-06-30 13F WESTAMERICA BANCORPORATION COM 957090103 153,331 29,300 23.62 7,427 18.28 0.0099
2025-05-14 2025-03-31 13F WESTAMERICA BANCORPORATION COM 957090103 124,031 99,200 399.50 6,280 382.26 0.0095
2025-02-13 2024-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 24,831 24,831 1,303 0.0019
2024-08-09 2024-06-30 13F WESTAMERICA BANCORPORATION COM 957090103 0 -46,566 -100.00 0 -100.00
2024-05-13 2024-03-31 13F WESTAMERICA BANCORPORATION COM 957090103 46,566 46,566 2 0.0036
2024-02-13 2023-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 0 -28,631 -100.00 0 -100.00
2023-11-14 2023-09-30 13F WESTAMERICA BANCORPORATION COM 957090103 28,631 -5,070 -15.04 1 0.00 0.0021
2023-08-11 2023-06-30 13F WESTAMERICA BANCORPORATION COM 957090103 33,701 -2,630 -7.24 1 0.00 0.0019
2023-05-12 2023-03-31 13F WESTAMERICA BANCORPORATION COM 957090103 36,331 6,531 21.92 2 0.00 0.0021
2023-02-13 2022-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 29,800 11,800 65.56 2 -99.89 0.0024
2022-11-14 2022-09-30 13F WESTAMERICA BANCORPORATION COM 957090103 18,000 -2,100 -10.45 941 -15.91 0.0013
2022-08-12 2022-06-30 13F WESTAMERICA BANCORPORATION COM 957090103 20,100 20,100 1,119 0.0013
2022-05-13 2022-03-31 13F WESTAMERICA BANCORPORATION COM 957090103 0 -11,331 -100.00 0 -100.00
2022-02-11 2021-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 11,331 -34,900 -75.49 654 -74.86 0.0008
2021-11-12 2021-09-30 13F WESTAMERICA BANCORPORATION COM 957090103 46,231 -13,100 -22.08 2,601 -24.46 0.0034
2021-08-13 2021-06-30 13F WESTAMERICA BANCORPORATION COM 957090103 59,331 -20,000 -25.21 3,443 -30.86 0.0043
2021-05-13 2021-03-31 13F WESTAMERICA BANCORPORATION COM 957090103 79,331 33,900 74.62 4,980 98.25 0.0062
2021-02-10 2020-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 45,431 -1,300 -2.78 2,512 -1.10 0.0027
2020-11-13 2020-09-30 13F WESTAMERICA BANCORPORATION COM 957090103 46,731 -38,200 -44.98 2,540 -47.92 0.0025
2020-08-13 2020-06-30 13F WESTAMERICA BANCORPORATION COM 957090103 84,931 41,031 93.46 4,877 89.03 0.0042
2020-05-14 2020-03-31 13F WESTAMERICA BANCORPORATION COM 957090103 43,900 1,269 2.98 2,580 -10.70 0.0025
2020-02-13 2019-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 42,631 11,000 34.78 2,889 46.87 0.0022
2019-11-13 2019-09-30 13F WESTAMERICA BANCORPORATION COM 957090103 31,631 26,100 471.89 1,967 476.83 0.0017
2019-08-12 2019-06-30 13F WESTAMERICA BANCORPORATION COM 957090103 5,531 5,531 341 0.0003
2018-02-13 2017-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 0 -8,100 -100.00 0 -100.00
2017-11-13 2017-09-30 13F WESTAMERICA BANCORPORATION COM 957090103 8,100 -36,731 -81.93 482 -80.81 0.0006
2017-08-11 2017-06-30 13F WESTAMERICA BANCORPORATION COM 957090103 44,831 1,900 4.43 2,512 4.80 0.0032
2017-05-12 2017-03-31 13F WESTAMERICA BANCORPORATION COM 957090103 42,931 -90,769 -67.89 2,397 -71.51 0.0033
2017-02-13 2016-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 133,700 -51,500 -27.81 8,414 -10.71 0.0133
2016-11-14 2016-09-30 13F WESTAMERICA BANCORPORATION COM 957090103 185,200 24,200 15.03 9,423 18.81 0.0167
2016-08-12 2016-06-30 13F WESTAMERICA BANCORPORATION COM 957090103 161,000 -1,000 -0.62 7,931 0.51 0.0151
2016-05-13 2016-03-31 13F WESTAMERICA BANCORPORATION COM 957090103 162,000 99,378 158.70 7,891 169.50 0.0150
2016-02-11 2015-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 62,622 -17,828 -22.16 2,928 -18.10 0.0064
2015-11-12 2015-09-30 13F WESTAMERICA BANCORPORATION COM 957090103 80,450 44,050 121.02 3,575 93.87 0.0085
2015-08-14 2015-06-30 13F WESTAMERICA BANCORPORATION COM 957090103 36,400 -106,831 -74.59 1,844 -70.21 0.0042
2015-05-13 2015-03-31 13F WESTAMERICA BANCORPORATION COM 957090103 143,231 83,796 140.99 6,189 112.39 0.0132
2015-02-13 2014-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 59,435 59,435 -58.50 2,914 -52.92 0.0070
2013-11-13 2013-09-30 13F WESTAMERICA BANCORPORATION COM 957090103 0 -77,431 -100.00 0 -100.00
2013-08-12 2013-06-30 13F WESTAMERICA BANCORPORATION COM 957090103 77,431 77,431 3,538 0.0093
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.