ウェアメリカ銀行法人
US ˙ NasdaqGS ˙ US9570901036

SecurityWABC / Westamerica Bancorporation
InstitutionRhumbline Advisers
Latest Disclosed Ownership77,469 shares
Latest Disclosed Value $ 4,039,992
Rhumbline Advisers reports 0.01% decrease in ownership of WABC / Westamerica Bancorporation

On May 12, 2026 - Rhumbline Advisers filed a 13F-HR form disclosing ownership of 77,469 shares of Westamerica Bancorporation (US:WABC) valued at $4,040,008 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 77,480 shares of Westamerica Bancorporation. This represents a change in shares of -0.01% during the quarter. The current value of the position is $4,383,196 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)
2026-05-12 2026-03-31 13F WESTAMERICA BANCORPORATION COM COM 957090103 77,469 -11 -0.01 4,040 9.01 0.0035
2026-02-13 2025-12-31 13F WESTAMERICA BANCORPORATION COM COM 957090103 77,480 -4,514 -5.51 3,706 -9.59 0.0030
2025-11-06 2025-09-30 13F WESTAMERICA BANCORPORATION COM COM 957090103 81,994 -3,808 -4.44 4,099 -1.40 0.0033
2025-08-12 2025-06-30 13F WESTAMERICA BANCORPORATION COM COM 957090103 85,802 559 0.66 4,156 -3.68 0.0036
2025-05-29 2025-03-31 13F/A-1 WESTAMERICA BANCORPORATION COM COM 957090103 85,243 -4,102 -4.59 4,316 -7.94 0.0040
2025-04-08 2025-03-31 13F WESTAMERICA BANCORPORATION COM COM 957090103 85,243 -4,102 4,316 0.0040
2025-05-29 2024-12-31 13F/A-1 WESTAMERICA BANCORPORATION COM COM 957090103 89,345 58 0.06 4,687 6.23 0.0042
2025-01-30 2024-12-31 13F WESTAMERICA BANCORPORATION COM COM 957090103 89,345 58 4,687 0.0042
2024-11-12 2024-09-30 13F WESTAMERICA BANCORPORATION COM COM 957090103 89,287 -5,011 -5.31 4,413 -3.58 0.0040
2024-08-01 2024-06-30 13F WESTAMERICA BANCORPORATION COM COM 957090103 94,298 -83 -0.09 4,576 -0.80 0.0043
2024-05-09 2024-03-31 13F WESTAMERICA BANCORPORATION COM COM 957090103 94,381 -2,732 -2.81 4,613 -15.79 0.0044
2024-02-08 2023-12-31 13F WESTAMERICA BANCORPORATION COM COM 957090103 97,113 788 0.82 5,478 31.49 0.0057
2023-11-09 2023-09-30 13F WESTAMERICA BANCORPORATION COM COM 957090103 96,325 -267 -0.28 4,166 12.63 0.0048
2023-08-08 2023-06-30 13F WESTAMERICA BANCORPORATION COM COM 957090103 96,592 -778 -0.80 3,699 92,375.00 0.0041
2023-05-11 2023-03-31 13F WESTAMERICA BANCORPORATION COM COM 957090103 97,370 5,463 5.94 4 -99.93 0.0053
2023-02-14 2022-12-31 13F WESTAMERICA BANCORPORATION COM COM 957090103 91,907 -3,104 -3.27 5,423 9.16 0.0073
2022-11-10 2022-09-30 13F WESTAMERICA BANCORPORATION COM COM 957090103 95,011 11,939 14.37 4,968 7.44 0.0074
2022-08-11 2022-06-30 13F WESTAMERICA BANCORPORATION COM COM 957090103 83,072 2,724 3.39 4,624 -4.88 0.0067
2022-05-12 2022-03-31 13F WESTAMERICA BANCORPORATION COM COM 957090103 80,348 715 0.90 4,861 5.74 0.0063
2022-02-10 2021-12-31 13F WESTAMERICA BANCORPORATION COM COM 957090103 79,633 1,565 2.00 4,597 4.67 0.0056
2021-11-12 2021-09-30 13F WESTAMERICA BANCORPORATION COM COM 957090103 78,068 -16,588 -17.52 4,392 -20.04 0.0059
2021-08-05 2021-06-30 13F WESTAMERICA BANCORPORATION COM COM 957090103 94,656 -3,072 -3.14 5,493 -10.46 0.0072
2021-05-06 2021-03-31 13F WESTAMERICA BANCORPORATION COM COM 957090103 97,728 -93 -0.10 6,135 13.42 0.0083
2021-02-10 2020-12-31 13F WESTAMERICA BANCORPORATION COM COM 957090103 97,821 6,055 6.60 5,409 8.46 0.0075
2020-11-12 2020-09-30 13F WESTAMERICA BANCORPORATION COM COM 957090103 91,766 -9,523 -9.40 4,987 -14.25 0.0078
2020-08-13 2020-06-30 13F WESTAMERICA BANCORPORATION COM COM 957090103 101,289 -5,795 -5.41 5,816 -7.59 0.0097
2020-05-06 2020-03-31 13F WESTAMERICA BANCORPORATION COM COM 957090103 107,084 11,507 12.04 6,294 -2.83 0.0132
2020-02-05 2019-12-31 13F WESTAMERICA BANCORPORATION COM COM 957090103 95,577 5,475 6.08 6,477 15.60 0.0108
2019-10-23 2019-09-30 13F WESTAMERICA BANCORPORATION COM COM 957090103 90,102 4,732 5.54 5,603 6.52 0.0102
2019-08-14 2019-06-30 13F WESTAMERICA BANCORPORATION COM COM 957090103 85,370 1,921 2.30 5,260 2.00 0.0099
2019-05-01 2019-03-31 13F WESTAMERICA BANCORPORATION COM COM 957090103 83,449 1,341 1.63 5,157 12.80 0.0100
2019-01-31 2018-12-31 13F WESTAMERICA BANCORPORATION COM COM 957090103 82,108 12,215 17.48 4,572 8.73 0.0099
2018-11-07 2018-09-30 13F WESTAMERICA BANCORPORATION COM COM 957090103 69,893 -5,644 -7.47 4,205 -1.50 0.0081
2018-08-06 2018-06-30 13F WESTAMERICA BANCORPORATION COM COM 957090103 75,537 107 0.14 4,269 -2.56 0.0086
2018-05-02 2018-03-31 13F WESTAMERICA BANCORPORATION COM COM 957090103 75,430 1,428 1.93 4,381 -0.59 0.0092
2018-02-09 2017-12-31 13F WESTAMERICA BANCORPORATION COM COM 957090103 74,002 7,762 11.72 4,407 11.74 0.0090
2017-11-06 2017-09-30 13F WESTAMERICA BANCORPORATION COM COM 957090103 66,240 7,774 13.30 3,944 20.39 0.0086
2017-08-02 2017-06-30 13F WESTAMERICA BANCORPORATION COM COM 957090103 58,466 638 1.10 3,276 1.46 0.0075
2017-05-02 2017-03-31 13F WESTAMERICA BANCORPORATION COM COM 957090103 57,828 4,523 8.49 3,229 -3.73 0.0075
2017-01-27 2016-12-31 13F WESTAMERICA BANCORPORATION COM COM 957090103 53,305 -1,121 -2.06 3,354 21.13 0.0085
2016-11-08 2016-09-30 13F WESTAMERICA BANCORPORATION COM COM 957090103 54,426 810 1.51 2,769 4.85 0.0076
2016-08-11 2016-06-30 13F WESTAMERICA BANCORPORATION COM COM 957090103 53,616 -8,236 -13.32 2,641 -12.35 0.0078
2016-05-02 2016-03-31 13F WESTAMERICA BANCORPORATION COM COM 957090103 61,852 5,235 9.25 3,013 13.83 0.0093
2016-02-03 2015-12-31 13F WESTAMERICA BANCORPORATION COM COM 957090103 56,617 1,955 3.58 2,647 8.97 0.0085
2015-11-04 2015-09-30 13F WESTAMERICA BANCORPORATION COM COM 957090103 54,662 722 1.34 2,429 -11.09 0.0083
2015-08-04 2015-06-30 13F WESTAMERICA BANCORPORATION COM COM 957090103 53,940 -2,450 -4.34 2,732 12.11 0.0087
2015-05-12 2015-03-31 13F WESTAMERICA BANCORPORATION COM COM 957090103 56,390 610 1.09 2,437 -10.86 0.0070
2015-02-06 2014-12-31 13F WESTAMERICA BANCORPORATION COM COM 957090103 55,780 -883 -1.56 2,734 3.72 0.0079
2014-11-12 2014-09-30 13F WESTAMERICA BANCORPORATION COM COM 957090103 56,663 -15,608 -21.60 2,636 -30.23 0.0079
2014-08-06 2014-06-30 13F WESTAMERICA BANCORPORATION COM COM 957090103 72,271 -5,811 -7.44 3,778 -10.54 0.0111
2014-05-06 2014-03-31 13F WESTAMERICA BANCORPORATION COM COM 957090103 78,082 1,940 2.55 4,223 -1.77 0.0125
2014-02-03 2013-12-31 13F WESTAMERICA BANCORPORATION COM COM 957090103 76,142 -4,006 -5.00 4,299 7.83 0.0127
2013-11-05 2013-09-30 13F WESTAMERICA BANCORPORATION COM COM 957090103 80,148 -1,723 -2.10 3,987 6.58 0.0124
2013-08-07 2013-06-30 13F WESTAMERICA BANCORPORATION COM COM 957090103 81,871 81,871 3,741 0.0120
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.