WESTAMERICA BANCORPORATION

Ticker: WABC CUSIP: 957090103 Class: Common Stock

Robeco Institutional Asset Management B.V.'s Holding History (CIK: 0001418773)

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

Q4 2023

Shares 39 Value ($000) $2 Avg Close $45.49 Range $38.59 - $53.38

Q1 2023

Shares 28,801 Value ($000) $1,276 Avg Close $47.96 Range $39.01 - $52.93

Q4 2022

Shares 156,070 Value ($000) $9,210 Avg Close $52.03 Range $45.87 - $56.69

Q3 2022

Shares 156,070 Value ($000) $8,161 Avg Close $50.12 Range $46.08 - $54.37

Q2 2022

Shares 103,716 Value ($000) $5,772 Avg Close $51.14 Range $48.47 - $53.70

Q4 2020

Shares 13,400 Value ($000) $741 Avg Close $46.10 Range $42.70 - $50.73

Q3 2020

Shares 13,400 Value ($000) $728 Avg Close $48.57 Range $43.00 - $54.06

Q2 2020

Shares 13,400 Value ($000) $769 Avg Close $48.00 Range $42.78 - $54.53

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2023	39	$2	$45.49	$38.59 - $53.38
Q1 2023	28,801	$1,276	$47.96	$39.01 - $52.93
Q4 2022	156,070	$9,210	$52.03	$45.87 - $56.69
Q3 2022	156,070	$8,161	$50.12	$46.08 - $54.37
Q2 2022	103,716	$5,772	$51.14	$48.47 - $53.70
Q4 2020	13,400	$741	$46.10	$42.70 - $50.73
Q3 2020	13,400	$728	$48.57	$43.00 - $54.06
Q2 2020	13,400	$769	$48.00	$42.78 - $54.53