WESTAMERICA BANCORPORATION

Ticker: WABC CUSIP: 957090103 Class: Common Stock

CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM's Holding History (CIK: 0001081019)

Note: Option positions (PUT/CALL) are excluded.

Q4 2025

Shares 24,267 Value ($000) $1,161 Avg Close $47.37 Range $44.09 - $50.85

Q3 2025

Shares 24,366 Value ($000) $1,218 Avg Close $48.41 Range $45.39 - $50.63

Q2 2025

Shares 33,886 Value ($000) $1,641 Avg Close $46.41 Range $40.44 - $50.21

Q1 2025

Shares 24,897 Value ($000) $1,261 Avg Close $48.88 Range $46.41 - $51.42

Q4 2024

Shares 24,897 Value ($000) $1,306 Avg Close $50.92 Range $44.42 - $57.25

Q3 2024

Shares 25,175 Value ($000) $1,244 Avg Close $47.96 Range $44.53 - $54.88

Q2 2024

Shares 25,979 Value ($000) $1,261 Avg Close $44.71 Range $41.94 - $47.91

Q1 2024

Shares 26,583 Value ($000) $1,299 Avg Close $44.93 Range $40.74 - $52.58

Q4 2023

Shares 27,992 Value ($000) $1,579 Avg Close $45.49 Range $38.59 - $53.38

Q3 2023

Shares 29,291 Value ($000) $1,267 Avg Close $40.65 Range $34.46 - $45.59

Q2 2023

Shares 31,392 Value ($000) $1,202 Avg Close $36.02 Range $31.77 - $39.59

Q1 2023

Shares 33,328 Value ($000) $1,476 Avg Close $47.96 Range $39.01 - $52.93

Q4 2022

Shares 33,798 Value ($000) $1,994 Avg Close $52.03 Range $45.87 - $56.69

Q3 2022

Shares 33,425 Value ($000) $1,748 Avg Close $50.12 Range $46.08 - $54.37

Q2 2022

Shares 34,019 Value ($000) $1,893 Avg Close $51.14 Range $48.47 - $53.70

Q1 2022

Shares 33,880 Value ($000) $2,050 Avg Close $51.69 Range $48.38 - $55.12

Q4 2021

Shares 36,991 Value ($000) $2,135 Avg Close $48.46 Range $45.96 - $50.44

Q3 2021

Shares 36,093 Value ($000) $2,031 Avg Close $48.00 Range $45.58 - $50.22

Q2 2021

Shares 35,990 Value ($000) $2,088 Avg Close $52.96 Range $48.87 - $55.24

Q1 2021

Shares 39,380 Value ($000) $2,472 Avg Close $51.31 Range $45.76 - $56.46

Q4 2020

Shares 39,380 Value ($000) $2,177 Avg Close $46.10 Range $42.70 - $50.73

Q3 2020

Shares 39,626 Value ($000) $2,154 Avg Close $48.57 Range $43.00 - $54.06

Q2 2020

Shares 39,626 Value ($000) $2,275 Avg Close $48.00 Range $42.78 - $54.53

Q1 2020

Shares 39,626 Value ($000) $2,329 Avg Close $50.93 Range $38.54 - $56.36

Q4 2019

Shares 39,822 Value ($000) $2,699 Avg Close $53.22 Range $48.47 - $56.23

Q3 2019

Shares 40,627 Value ($000) $2,526 Avg Close $50.16 Range $47.48 - $52.86

Q2 2019

Shares 40,142 Value ($000) $2,473 Avg Close $49.98 Range $47.55 - $52.33

Q1 2019

Shares 39,459 Value ($000) $2,439 Avg Close $49.51 Range $43.81 - $52.00

Q4 2018

Shares 40,336 Value ($000) $2,246 Avg Close $46.68 Range $41.39 - $50.57

Q3 2018

Shares 39,427 Value ($000) $2,372 Avg Close $48.42 Range $42.38 - $51.15

Q2 2018

Shares 39,441 Value ($000) $2,229 Avg Close $45.23 Range $42.53 - $47.73

Q1 2018

Shares 38,780 Value ($000) $2,252 Avg Close $46.10 Range $42.86 - $48.73

Q4 2017

Shares 40,139 Value ($000) $2,390 Avg Close $45.39 Range $41.22 - $49.73

Q3 2017

Shares 40,700 Value ($000) $2,423 Avg Close $41.22 Range $37.95 - $46.20

Q2 2017

Shares 45,141 Value ($000) $2,530 Avg Close $41.48 Range $38.41 - $44.70

Q1 2017

Shares 48,673 Value ($000) $2,717 Avg Close $43.50 Range $40.27 - $48.84

Q4 2016

Shares 50,873 Value ($000) $3,201 Avg Close $42.49 Range $35.31 - $49.16

Q3 2016

Shares 52,273 Value ($000) $2,660 Avg Close $36.26 Range $34.29 - $38.21

Q2 2016

Shares 51,773 Value ($000) $2,550 Avg Close $35.72 Range $33.77 - $38.30

Q1 2016

Shares 54,326 Value ($000) $2,646 Avg Close $33.33 Range $29.47 - $37.02

Q4 2015

Shares 47,333 Value ($000) $2,213 Avg Close $33.66 Range $30.28 - $36.28

Q3 2015

Shares 46,566 Value ($000) $2,069 Avg Close $34.11 Range $30.99 - $37.49

Q2 2015

Shares 46,666 Value ($000) $2,364 Avg Close $32.83 Range $29.86 - $37.32

Q1 2015

Shares 48,000 Value ($000) $2,074 Avg Close $30.86 Range $28.78 - $34.76

Q4 2014

Shares 48,800 Value ($000) $2,392 Avg Close $33.70 Range $29.79 - $36.02

Q3 2014

Shares 48,592 Value ($000) $2,261 Avg Close $33.99 Range $32.17 - $37.33

Q2 2014

Shares 48,016 Value ($000) $2,510 Avg Close $35.20 Range $33.12 - $38.02

Q1 2014

Shares 49,116 Value ($000) $2,656 Avg Close $35.67 Range $33.22 - $38.53

Q4 2013

Shares 48,816 Value ($000) $2,756 Avg Close $36.29 Range $32.69 - $39.26

Q3 2013

Shares 48,516 Value ($000) $2,413 Avg Close $32.64 Range $30.72 - $34.37

Q2 2013

Shares 47,016 Value ($000) $2,148 Avg Close $29.77 Range $27.86 - $31.27

Q1 2013

Shares 48,470 Value ($000) $2,197 Avg Close $29.62 Range $28.15 - $30.49

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	24,267	$1,161	$47.37	$44.09 - $50.85
Q3 2025	24,366	$1,218	$48.41	$45.39 - $50.63
Q2 2025	33,886	$1,641	$46.41	$40.44 - $50.21
Q1 2025	24,897	$1,261	$48.88	$46.41 - $51.42
Q4 2024	24,897	$1,306	$50.92	$44.42 - $57.25
Q3 2024	25,175	$1,244	$47.96	$44.53 - $54.88
Q2 2024	25,979	$1,261	$44.71	$41.94 - $47.91
Q1 2024	26,583	$1,299	$44.93	$40.74 - $52.58
Q4 2023	27,992	$1,579	$45.49	$38.59 - $53.38
Q3 2023	29,291	$1,267	$40.65	$34.46 - $45.59
Q2 2023	31,392	$1,202	$36.02	$31.77 - $39.59
Q1 2023	33,328	$1,476	$47.96	$39.01 - $52.93
Q4 2022	33,798	$1,994	$52.03	$45.87 - $56.69
Q3 2022	33,425	$1,748	$50.12	$46.08 - $54.37
Q2 2022	34,019	$1,893	$51.14	$48.47 - $53.70
Q1 2022	33,880	$2,050	$51.69	$48.38 - $55.12
Q4 2021	36,991	$2,135	$48.46	$45.96 - $50.44
Q3 2021	36,093	$2,031	$48.00	$45.58 - $50.22
Q2 2021	35,990	$2,088	$52.96	$48.87 - $55.24
Q1 2021	39,380	$2,472	$51.31	$45.76 - $56.46
Q4 2020	39,380	$2,177	$46.10	$42.70 - $50.73
Q3 2020	39,626	$2,154	$48.57	$43.00 - $54.06
Q2 2020	39,626	$2,275	$48.00	$42.78 - $54.53
Q1 2020	39,626	$2,329	$50.93	$38.54 - $56.36
Q4 2019	39,822	$2,699	$53.22	$48.47 - $56.23
Q3 2019	40,627	$2,526	$50.16	$47.48 - $52.86
Q2 2019	40,142	$2,473	$49.98	$47.55 - $52.33
Q1 2019	39,459	$2,439	$49.51	$43.81 - $52.00
Q4 2018	40,336	$2,246	$46.68	$41.39 - $50.57
Q3 2018	39,427	$2,372	$48.42	$42.38 - $51.15
Q2 2018	39,441	$2,229	$45.23	$42.53 - $47.73
Q1 2018	38,780	$2,252	$46.10	$42.86 - $48.73
Q4 2017	40,139	$2,390	$45.39	$41.22 - $49.73
Q3 2017	40,700	$2,423	$41.22	$37.95 - $46.20
Q2 2017	45,141	$2,530	$41.48	$38.41 - $44.70
Q1 2017	48,673	$2,717	$43.50	$40.27 - $48.84
Q4 2016	50,873	$3,201	$42.49	$35.31 - $49.16
Q3 2016	52,273	$2,660	$36.26	$34.29 - $38.21
Q2 2016	51,773	$2,550	$35.72	$33.77 - $38.30
Q1 2016	54,326	$2,646	$33.33	$29.47 - $37.02
Q4 2015	47,333	$2,213	$33.66	$30.28 - $36.28
Q3 2015	46,566	$2,069	$34.11	$30.99 - $37.49
Q2 2015	46,666	$2,364	$32.83	$29.86 - $37.32
Q1 2015	48,000	$2,074	$30.86	$28.78 - $34.76
Q4 2014	48,800	$2,392	$33.70	$29.79 - $36.02
Q3 2014	48,592	$2,261	$33.99	$32.17 - $37.33
Q2 2014	48,016	$2,510	$35.20	$33.12 - $38.02
Q1 2014	49,116	$2,656	$35.67	$33.22 - $38.53
Q4 2013	48,816	$2,756	$36.29	$32.69 - $39.26
Q3 2013	48,516	$2,413	$32.64	$30.72 - $34.37
Q2 2013	47,016	$2,148	$29.77	$27.86 - $31.27
Q1 2013	48,470	$2,197	$29.62	$28.15 - $30.49