Westamerica Bancorporation
US ˙ NasdaqGS ˙ US9570901036

SecurityWABC / Westamerica Bancorporation
InstitutionMorgan Stanley
Latest Disclosed Ownership255,156 shares
Latest Disclosed Value $ 13,306,395
Morgan Stanley reports 13.44% decrease in ownership of WABC / Westamerica Bancorporation

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 255,156 shares of Westamerica Bancorporation (US:WABC) valued at $13,306,385 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 294,769 shares of Westamerica Bancorporation. This represents a change in shares of -13.44% during the quarter. The current value of the position is $14,370,386 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)
2026-05-15 2026-03-31 13F WESTAMERICA BANCORPORATION COM 957090103 255,156 -39,613 -13.44 13,306 -5.62 0.0008
2026-05-27 2025-12-31 13F/A-1 WESTAMERICA BANCORPORATION COM 957090103 294,769 -392 -0.13 14,099 -4.45 0.0008
2026-02-13 2025-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 294,769 -392 14,099 0.0008
2026-05-27 2025-09-30 13F/A-1 WESTAMERICA BANCORPORATION COM 957090103 295,161 -21,030 -6.65 14,755 -3.66 0.0009
2025-11-14 2025-09-30 13F WESTAMERICA BANCORPORATION COM 957090103 295,161 -21,030 14,755 0.0009
2025-08-15 2025-06-30 13F WESTAMERICA BANCORPORATION COM 957090103 316,191 -249,768 -44.13 15,316 -46.55 0.0010
2025-05-15 2025-03-31 13F WESTAMERICA BANCORPORATION COM 957090103 565,959 -102,672 -15.36 28,655 -18.31 0.0020
2025-05-15 2024-12-31 13F/A-1 WESTAMERICA BANCORPORATION COM 957090103 668,631 -34,986 -4.97 35,076 0.87 0.0025
2025-02-14 2024-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 668,631 -34,986 35,076 0.0025
2025-05-14 2024-09-30 13F/A-2 WESTAMERICA BANCORPORATION COM 957090103 703,617 49,146 7.51 34,773 9.48 0.0025
2025-02-14 2024-09-30 13F/A-1 WESTAMERICA BANCORPORATION COM 957090103 703,617 49,146 34,773 0.0025
2024-11-14 2024-09-30 13F WESTAMERICA BANCORPORATION COM 957090103 703,617 49,146 34,773 0.0003
2025-05-14 2024-06-30 13F/A-2 WESTAMERICA BANCORPORATION COM 957090103 654,471 -79,129 -10.79 31,762 -11.43 0.0025
2024-10-17 2024-06-30 13F/A-1 WESTAMERICA BANCORPORATION COM 957090103 654,471 -79,129 31,762 0.0025
2024-08-14 2024-06-30 13F WESTAMERICA BANCORPORATION COM 957090103 654,471 -79,129 31,762 0.0025
2024-10-17 2024-03-31 13F/A-2 WESTAMERICA BANCORPORATION COM 957090103 733,600 -36,316 -4.72 35,858 -17.44 0.0029
2024-08-16 2024-03-31 13F/A-1 WESTAMERICA BANCORPORATION COM 957090103 733,600 -36,316 35,858 0.0003
2024-05-15 2024-03-31 13F WESTAMERICA BANCORPORATION COM 957090103 733,600 -36,316 35,858 0.0029
2024-08-16 2023-12-31 13F/A-1 WESTAMERICA BANCORPORATION COM 957090103 769,916 41,834 5.75 43,431 37.92 0.0038
2024-02-13 2023-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 769,916 41,834 43,431 0.0038
2023-11-15 2023-09-30 13F WESTAMERICA BANCORPORATION COM 957090103 728,082 -27,876 -3.69 31,490 8.76 0.0032
2023-08-14 2023-06-30 13F WESTAMERICA BANCORPORATION COM 957090103 755,958 64,326 9.30 28,953 -5.50 0.0029
2023-05-15 2023-03-31 13F WESTAMERICA BANCORPORATION COM 957090103 691,632 -3,987 -0.57 30,639 -25.36 0.0033
2023-02-14 2022-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 695,619 429,802 161.69 41,049 195.31 0.0047
2022-11-14 2022-09-30 13F WESTAMERICA BANCORPORATION COM 957090103 265,817 36,250 15.79 13,900 8.78 0.0019
2022-10-27 2022-06-30 13F/A-1 WESTAMERICA BANCORPORATION COM 957090103 229,567 94,856 70.41 12,778 56.79 0.0017
2022-08-15 2022-06-30 13F WESTAMERICA BANCORPORATION COM 957090103 229,567 94,856 12,778 0.0003
2022-10-27 2022-03-31 13F/A-1 WESTAMERICA BANCORPORATION COM 957090103 134,711 -2,385 -1.74 8,150 2.96 0.0011
2022-05-13 2022-03-31 13F WESTAMERICA BANCORPORATION COM 957090103 134,711 -2,385 8,150 0.0011
2022-02-14 2021-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 137,096 -38,709 -22.02 7,916 -19.96 0.0010
2021-11-15 2021-09-30 13F WESTAMERICA BANCORPORATION COM 957090103 175,805 18,259 11.59 9,890 8.18 0.0013
2021-08-23 2021-06-30 13F/A-1 WESTAMERICA BANCORPORATION COM 957090103 157,546 24,724 18.61 9,142 9.63 0.0012
2021-08-16 2021-06-30 13F WESTAMERICA BANCORPORATION COM 957090103 157,546 24,724 9,142 0.0003
2021-05-17 2021-03-31 13F WESTAMERICA BANCORPORATION COM 957090103 132,822 -26,548 -16.66 8,339 -5.37 0.0012
2021-02-16 2020-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 159,370 21,107 15.27 8,812 17.26 0.0014
2020-11-13 2020-09-30 13F WESTAMERICA BANCORPORATION COM 957090103 138,263 8,108 6.23 7,515 0.55 0.0015
2020-08-14 2020-06-30 13F WESTAMERICA BANCORPORATION COM 957090103 130,155 17,642 15.68 7,474 13.00 0.0017
2020-05-26 2020-03-31 13F/A-1 WESTAMERICA BANCORPORATION COM 957090103 112,513 -66,148 -37.02 6,614 -45.37 0.0018
2020-05-15 2020-03-31 13F WESTAMERICA BANCORPORATION COM 957090103 112,513 -66,148 6,614 508.0931
2020-02-14 2019-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 178,661 41,533 30.29 12,108 42.01 0.0028
2019-11-14 2019-09-30 13F WESTAMERICA BANCORPORATION COM 957090103 137,128 -28,260 -17.09 8,526 -16.32 0.0023
2019-08-14 2019-06-30 13F WESTAMERICA BANCORPORATION COM 957090103 165,388 109,759 197.31 10,189 196.36 0.0027
2019-05-15 2019-03-31 13F WESTAMERICA BANCORPORATION COM 957090103 55,629 -33,149 -37.34 3,438 -30.45 0.0010
2019-02-14 2018-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 88,778 -4,888 -5.22 4,943 -12.28 0.0015
2019-04-23 2018-09-30 13F/A-2 WESTAMERICA BANCORPORATION COM 957090103 93,666 -14,113 -13.09 5,635 -7.47 0.0014
2018-11-20 2018-09-30 13F/A-1 WESTAMERICA BANCORPORATION COM 957090103 93,666 0 5,635 0.0014
2018-11-14 2018-09-30 13F WESTAMERICA BANCORPORATION COM 957090103 93,666 -14,113 5,635
2019-04-23 2018-06-30 13F/A-1 WESTAMERICA BANCORPORATION COM 957090103 107,779 -4,335 -3.87 6,090 -6.47 0.0016
2018-08-14 2018-06-30 13F WESTAMERICA BANCORPORATION COM 957090103 107,779 -4,335 6,090
2019-04-23 2018-03-31 13F/A-1 WESTAMERICA BANCORPORATION COM 957090103 112,114 3,531 3.25 6,511 0.68 0.0018
2018-05-14 2018-03-31 13F WESTAMERICA BANCORPORATION COM 957090103 112,114 3,531 6,511
2019-04-23 2017-12-31 13F/A-1 WESTAMERICA BANCORPORATION COM 957090103 108,583 24,689 29.43 6,467 29.44 0.0018
2018-02-14 2017-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 108,583 24,689 6,467
2017-11-14 2017-09-30 13F WESTAMERICA BANCORPORATION COM 957090103 83,894 10,409 14.16 4,996 21.35 0.0015
2017-08-11 2017-06-30 13F WESTAMERICA BANCORPORATION COM 957090103 73,485 -4,275 -5.50 4,117 -5.18 0.0012
2017-05-22 2017-03-31 13F/A-1 WESTAMERICA BANCORPORATION COM 957090103 77,760 -34,921 -30.99 4,342 -38.77 0.0013
2017-05-12 2017-03-31 13F WESTAMERICA BANCORPORATION COM 957090103 77,760 4,342
2017-02-22 2016-12-31 13F/A-1 WESTAMERICA BANCORPORATION COM 957090103 112,681 63,318 128.27 7,091 182.29 0.0023
2017-02-13 2016-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 112,681 7,091
2016-11-10 2016-09-30 13F WESTAMERICA BANCORPORATION COM 957090103 49,363 3,349 7.28 2,512 10.76 0.0009
2016-08-12 2016-06-30 13F WESTAMERICA BANCORPORATION COM 957090103 46,014 -58 -0.13 2,268 1.07 0.0008
2016-05-12 2016-03-31 13F WESTAMERICA BANCORPORATION COM 957090103 46,072 -4,153 -8.27 2,244 -4.43 0.0009
2016-02-09 2015-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 50,225 -56,415 -52.90 2,348 -50.44 0.0008
2016-02-08 2015-09-30 13F/A-1 WESTAMERICA BANCORPORATION COM 957090103 106,640 58,929 123.51 4,738 96.11 0.0018
2015-11-09 2015-09-30 13F WESTAMERICA BANCORPORATION COM 957090103 106,640 4,738
2015-08-12 2015-06-30 13F WESTAMERICA BANCORPORATION COM 957090103 47,711 -78,937 -62.33 2,416 -55.85 0.0008
2015-05-14 2015-03-31 13F WESTAMERICA BANCORPORATION COM 957090103 126,648 83,481 193.39 5,472 158.48 0.0020
2015-02-13 2014-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 43,167 876 2.07 2,117 7.57 0.0008
2014-12-16 2014-09-30 13F/A-1 WESTAMERICA BANCORPORATION COM 957090103 42,291 11,781 38.61 1,968 19.27 0.0008
2014-11-14 2014-09-30 13F WESTAMERICA BANCORPORATION COM 957090103 42,291 1,968
2014-05-13 2014-03-31 13F WESTAMERICA BANCORPORATION COM 957090103 30,510 -3,199 -9.49 1,650 -13.29 0.0007
2014-02-13 2013-12-31 13F WESTAMERICA BANCORPORATION COM 957090103 33,709 13,205 64.40 1,903 86.57 0.0008
2013-11-13 2013-09-30 13F WESTAMERICA BANCORPORATION COM 957090103 20,504 -5 -0.02 1,020 8.74 0.0005
2013-08-08 2013-06-30 13F WESTAMERICA BANCORPORATION COM 957090103 20,509 20,509 938 0.0005
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.