COLUMBIA BKG SYS INC

Ticker: COLB CUSIP: 197236102 Class: Common Stock

AMG National Trust Bank's Holding History (CIK: 0001388829)

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

Q4 2025

Shares 65,965 Value ($000) $1,844 Avg Close $26.85 Range $23.52 - $29.61

Q3 2025

Shares 64,243 Value ($000) $1,654 Avg Close $24.85 Range $22.17 - $27.12

Q1 2020

Shares 25,506 Value ($000) $684 Avg Close $26.37 Range $16.50 - $30.72

Q4 2019

Shares 25,508 Value ($000) $1,038 Avg Close $28.93 Range $25.93 - $30.83

Q3 2019

Shares 25,206 Value ($000) $930 Avg Close $26.32 Range $24.40 - $28.14

Q2 2019

Shares 24,083 Value ($000) $871 Avg Close $25.85 Range $23.83 - $27.76

Q1 2019

Shares 24,162 Value ($000) $790 Avg Close $26.24 Range $22.24 - $28.02

Q4 2018

Shares 28,951 Value ($000) $1,050 Avg Close $26.74 Range $22.25 - $29.45

Q3 2018

Shares 30,600 Value ($000) $1,186 Avg Close $29.39 Range $27.14 - $30.95

Q2 2018

Shares 26,489 Value ($000) $1,084 Avg Close $30.05 Range $27.72 - $31.69

Q1 2018

Shares 26,584 Value ($000) $1,115 Avg Close $30.33 Range $27.89 - $32.56

Q4 2017

Shares 26,288 Value ($000) $1,142 Avg Close $30.37 Range $28.50 - $33.50

Q3 2017

Shares 26,267 Value ($000) $1,106 Avg Close $26.76 Range $24.74 - $29.77

Q2 2017

Shares 20,769 Value ($000) $828 Avg Close $26.82 Range $24.90 - $28.62

Q1 2017

Shares 16,938 Value ($000) $660 Avg Close $27.57 Range $24.96 - $31.16

Q4 2016

Shares 15,104 Value ($000) $675 Avg Close $25.64 Range $21.40 - $30.88

Q3 2016

Shares 22,035 Value ($000) $721 Avg Close $20.96 Range $17.45 - $22.43

Q2 2016

Shares 21,758 Value ($000) $611 Avg Close $19.43 Range $17.42 - $20.90

Q1 2016

Shares 19,660 Value ($000) $588 Avg Close $19.19 Range $17.45 - $20.84

Q4 2015

Shares 17,930 Value ($000) $583 Avg Close $21.56 Range $18.94 - $23.51

Q3 2015

Shares 17,930 Value ($000) $560 Avg Close $20.19 Range $18.36 - $21.62

Q2 2015

Shares 17,993 Value ($000) $585 Avg Close $19.28 Range $17.74 - $21.20

Q1 2015

Shares 18,099 Value ($000) $524 Avg Close $17.14 Range $15.27 - $18.50

Q4 2014

Shares 18,301 Value ($000) $505 Avg Close $16.65 Range $14.67 - $17.82

Q3 2014

Shares 19,738 Value ($000) $490 Avg Close $15.78 Range $14.87 - $16.51

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	65,965	$1,844	$26.85	$23.52 - $29.61
Q3 2025	64,243	$1,654	$24.85	$22.17 - $27.12
Q1 2020	25,506	$684	$26.37	$16.50 - $30.72
Q4 2019	25,508	$1,038	$28.93	$25.93 - $30.83
Q3 2019	25,206	$930	$26.32	$24.40 - $28.14
Q2 2019	24,083	$871	$25.85	$23.83 - $27.76
Q1 2019	24,162	$790	$26.24	$22.24 - $28.02
Q4 2018	28,951	$1,050	$26.74	$22.25 - $29.45
Q3 2018	30,600	$1,186	$29.39	$27.14 - $30.95
Q2 2018	26,489	$1,084	$30.05	$27.72 - $31.69
Q1 2018	26,584	$1,115	$30.33	$27.89 - $32.56
Q4 2017	26,288	$1,142	$30.37	$28.50 - $33.50
Q3 2017	26,267	$1,106	$26.76	$24.74 - $29.77
Q2 2017	20,769	$828	$26.82	$24.90 - $28.62
Q1 2017	16,938	$660	$27.57	$24.96 - $31.16
Q4 2016	15,104	$675	$25.64	$21.40 - $30.88
Q3 2016	22,035	$721	$20.96	$17.45 - $22.43
Q2 2016	21,758	$611	$19.43	$17.42 - $20.90
Q1 2016	19,660	$588	$19.19	$17.45 - $20.84
Q4 2015	17,930	$583	$21.56	$18.94 - $23.51
Q3 2015	17,930	$560	$20.19	$18.36 - $21.62
Q2 2015	17,993	$585	$19.28	$17.74 - $21.20
Q1 2015	18,099	$524	$17.14	$15.27 - $18.50
Q4 2014	18,301	$505	$16.65	$14.67 - $17.82
Q3 2014	19,738	$490	$15.78	$14.87 - $16.51