Westamerica Bancorporation
US ˙ NasdaqGS ˙ US9570901036

SecurityWABC / Westamerica Bancorporation
InstitutionSei Investments Co
Latest Disclosed Ownership26,265 shares
Latest Disclosed Value $ 1,256,074
Sei Investments Co reports 19.58% increase in ownership of WABC / Westamerica Bancorporation

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 26,265 shares of Westamerica Bancorporation (US:WABC) valued at $1,256,255 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 21,965 shares of Westamerica Bancorporation. This represents a change in shares of 19.58% during the quarter. The current value of the position is $1,479,245 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)
2026-02-13 2025-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 26,265 4,300 19.58 1,256 14.39 0.0012
2025-11-13 2025-09-30 13F WESTAMERICA BANCORPORATION COM 957090103 21,965 5,281 31.65 1,098 35.89 0.0012
2025-08-14 2025-06-30 13F WESTAMERICA BANCORPORATION COM 957090103 16,684 -99,802 -85.68 808 -86.30 0.0009
2025-05-14 2025-03-31 13F/A-1 WESTAMERICA BANCORPORATION COM 957090103 116,486 -1,713 -1.45 5,898 -4.89 0.0076
2025-05-13 2025-03-31 13F WESTAMERICA BANCORPORATION COM 957090103 118,286 87 6,198 0.0067
2025-02-11 2024-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 118,199 -6,543 -5.25 6,201 0.58 0.0080
2024-11-12 2024-09-30 13F WESTAMERICA BANCORPORATION COM 957090103 124,742 -9,582 -7.13 6,165 -5.43 0.0080
2024-08-13 2024-06-30 13F WESTAMERICA BANCORPORATION COM 957090103 134,324 12,888 10.61 6,519 9.82 0.0092
2024-05-07 2024-03-31 13F WESTAMERICA BANCORPORATION COM 957090103 121,436 21,624 21.66 5,936 5.42 0.0087
2024-02-14 2023-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 99,812 5,194 5.49 5,630 37.59 0.0090
2023-11-14 2023-09-30 13F WESTAMERICA BANCORPORATION COM 957090103 94,618 11,794 14.24 4,092 29.00 0.0074
2023-08-11 2023-06-30 13F WESTAMERICA BANCORPORATION COM 957090103 82,824 5,243 6.76 3,172 -7.68 0.0055
2023-05-12 2023-03-31 13F WESTAMERICA BANCORPORATION COM 957090103 77,581 1,054 1.38 3,437 -23.90 0.0064
2023-02-10 2022-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 76,527 -15,866 -17.17 4,516 -6.54 0.0100
2022-11-14 2022-09-30 13F WESTAMERICA BANCORPORATION COM 957090103 92,393 1,135 1.24 4,831 -4.56 0.0108
2022-08-15 2022-06-30 13F WESTAMERICA BANCORPORATION COM 957090103 91,258 154 0.17 5,062 -7.85 0.0109
2022-05-13 2022-03-31 13F WESTAMERICA BANCORPORATION COM 957090103 91,104 3,527 4.03 5,493 9.05 0.0110
2022-02-14 2021-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 87,577 5,503 6.70 5,037 9.48 0.0094
2021-11-12 2021-09-30 13F WESTAMERICA BANCORPORATION COM 957090103 82,074 4,859 6.29 4,601 3.09 0.0097
2021-08-06 2021-06-30 13F WESTAMERICA BANCORPORATION COM 957090103 77,215 13,439 21.07 4,463 12.36 0.0099
2021-05-12 2021-03-31 13F WESTAMERICA BANCORPORATION COM 957090103 63,776 -1,233 -1.90 3,972 11.23 0.0100
2021-02-08 2020-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 65,009 -262 -0.40 3,571 0.68 0.0092
2020-12-04 2020-09-30 13F/A-1 WESTAMERICA BANCORPORATION COM 957090103 65,271 13,250 25.47 3,547 18.75 0.0103
2020-11-06 2020-09-30 13F WESTAMERICA BANCORPORATION COM 957090103 65,271 13,250 3,547 8,540.3874
2020-08-17 2020-06-30 13F/A-1 WESTAMERICA BANCORPORATION COM 957090103 52,021 17,621 51.22 2,987 47.73 0.0093
2020-08-11 2020-06-30 13F WESTAMERICA BANCORPORATION COM 957090103 36,720 2,320 2,489 6,751.5450
2020-05-14 2020-03-31 13F WESTAMERICA BANCORPORATION COM 957090103 34,400 -2,320 -6.32 2,022 -18.76 0.0074
2020-02-06 2019-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 36,720 -1,279 -3.37 2,489 5.33 0.0074
2019-11-12 2019-09-30 13F WESTAMERICA BANCORPORATION COM 957090103 37,999 942 2.54 2,363 3.50 0.0060
2019-08-14 2019-06-30 13F WESTAMERICA BANCORPORATION COM 957090103 37,057 -7,456 -16.75 2,283 -17.01 0.0075
2019-05-15 2019-03-31 13F WESTAMERICA BANCORPORATION COM 957090103 44,513 -11,637 -20.72 2,751 -18.56 0.0092
2019-02-13 2018-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 56,150 0 0.00 3,378 0.00 0.0120
2018-11-08 2018-09-30 13F WESTAMERICA BANCORPORATION COM 957090103 56,150 16,557 41.82 3,378 51.01 0.0122
2018-08-03 2018-06-30 13F WESTAMERICA BANCORPORATION COM 957090103 39,593 143 0.36 2,237 -2.36 0.0076
2018-05-11 2018-03-31 13F WESTAMERICA BANCORPORATION COM 957090103 39,450 3,430 9.52 2,291 6.81 0.0088
2018-02-08 2017-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 36,020 5,953 19.80 2,145 19.83 0.0074
2017-11-06 2017-09-30 13F WESTAMERICA BANCORPORATION COM 957090103 30,067 -28,131 -48.34 1,790 -45.11 0.0064
2017-07-31 2017-06-30 13F WESTAMERICA BANCORPORATION COM 957090103 58,198 2,931 5.30 3,261 5.71 0.0130
2017-05-05 2017-03-31 13F WESTAMERICA BANCORPORATION COM 957090103 55,267 -25,062 -31.20 3,085 -38.97 0.0135
2017-02-02 2016-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 80,329 2,343 3.00 5,055 27.39 0.0245
2016-11-04 2016-09-30 13F WESTAMERICA BANCORPORATION COM 957090103 77,986 3,905 5.27 3,968 8.74 0.0202
2016-08-11 2016-06-30 13F WESTAMERICA BANCORPORATION COM 957090103 74,081 -4,937 -6.25 3,649 -5.20 0.0219
2016-05-10 2016-03-31 13F/A-1 WESTAMERICA BANCORPORATION COM 957090103 79,018 364 0.46 3,849 4.68 0.0240
2016-02-03 2015-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 78,654 71,339 975.24 3,677 1,031.38 0.0224
2015-11-02 2015-09-30 13F/A-1 WESTAMERICA BANCORPORATION COM 957090103 7,315 -644 -8.09 325 -19.35 0.0030
2015-10-30 2015-09-30 13F WESTAMERICA BANCORPORATION COM 957090103 7,315 326
2015-08-07 2015-06-30 13F/A-1 WESTAMERICA BANCORPORATION COM 957090103 7,959 1,544 24.07 403 45.49 0.0036
2015-08-04 2015-06-30 13F WESTAMERICA BANCORPORATION COM 957090103 7,959 1,544 403 0.0036
2015-05-14 2015-03-31 13F/A-1 WESTAMERICA BANCORPORATION COM 957090103 6,415 515 8.73 277 -4.15 0.0024
2015-05-01 2015-03-31 13F WEST PHARMACEUTICAL SVSC SDCV 4.000% 3/1 957090103 6,415 277
2015-02-10 2014-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 5,900 5,900 289 0.0026
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.