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   <title>Form  4          COLUMBIA BANKING SYSTEM,  For: Jun 15  Filed by: MACHUCA LUIS</title>
   <link>http://www.streetinsider.com/SEC+Filings/Form++4++++++++++COLUMBIA+BANKING+SYSTEM%2C++For%3A+Jun+15++Filed+by%3A+MACHUCA+LUIS/26654855.html</link>
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   <title>Form  4          COLUMBIA BANKING SYSTEM,  For: Jun 15  Filed by: MACHUCA LUIS</title>
   <link>http://www.streetinsider.com/SEC+Filings/Form++4++++++++++COLUMBIA+BANKING+SYSTEM%2C++For%3A+Jun+15++Filed+by%3A+MACHUCA+LUIS/26654855.html</link>
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   <title>Form  11-K/A     COLUMBIA BANKING SYSTEM,  For: Dec 31</title>
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   <title>Form  11-K/A     COLUMBIA BANKING SYSTEM,  For: Dec 31</title>
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   <title>Form  4          COLUMBIA BANKING SYSTEM,  For: Jun 08  Filed by: Moore Devine David</title>
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   <title>Form  144        COLUMBIA BANKING SYSTEM,               Filed by: Moore Devine David</title>
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   <title>Form  144        COLUMBIA BANKING SYSTEM,               Filed by: Moore Devine David</title>
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   <title>Form  4          COLUMBIA BANKING SYSTEM,  For: May 14  Filed by: Varnado Anddria</title>
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   <pubDate>Mon, 18 May 2026 17:18:00 -0400</pubDate>
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   <title>Form  4          COLUMBIA BANKING SYSTEM,  For: May 14  Filed by: Terry Hilliard C. III</title>
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   <title>Form  4          COLUMBIA BANKING SYSTEM,  For: May 14  Filed by: Terry Hilliard C. III</title>
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   <title>Form  4          COLUMBIA BANKING SYSTEM,  For: May 14  Filed by: STUDENMUND JAYNIE M</title>
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   <pubDate>Mon, 18 May 2026 17:16:00 -0400</pubDate>
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   <title>Form  4          COLUMBIA BANKING SYSTEM,  For: May 14  Filed by: STUDENMUND JAYNIE M</title>
   <link>http://www.streetinsider.com/SEC+Filings/Form++4++++++++++COLUMBIA+BANKING+SYSTEM%2C++For%3A+May+14++Filed+by%3A+STUDENMUND+JAYNIE+M/26515115.html</link>
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   <title>Form  4          COLUMBIA BANKING SYSTEM,  For: May 14  Filed by: SEATON ELIZABETH WHITEHEAD</title>
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   <title>Form  4          COLUMBIA BANKING SYSTEM,  For: May 14  Filed by: SEATON ELIZABETH WHITEHEAD</title>
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   <title>Form  4          COLUMBIA BANKING SYSTEM,  For: May 14  Filed by: SCHULTZ JOHN F</title>
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   <pubDate>Mon, 18 May 2026 17:13:00 -0400</pubDate>
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   <title>Form  4          COLUMBIA BANKING SYSTEM,  For: May 14  Filed by: SCHULTZ JOHN F</title>
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   <title>Form  4          COLUMBIA BANKING SYSTEM,  For: May 14  Filed by: MITCHELL M CHRISTIAN</title>
   <link>http://www.streetinsider.com/SEC+Filings/Form++4++++++++++COLUMBIA+BANKING+SYSTEM%2C++For%3A+May+14++Filed+by%3A+MITCHELL+M+CHRISTIAN/26515044.html</link>
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   <title>Form  4          COLUMBIA BANKING SYSTEM,  For: May 14  Filed by: MITCHELL M CHRISTIAN</title>
   <link>http://www.streetinsider.com/SEC+Filings/Form++4++++++++++COLUMBIA+BANKING+SYSTEM%2C++For%3A+May+14++Filed+by%3A+MITCHELL+M+CHRISTIAN/26515044.html</link>
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   <title>Form  4          COLUMBIA BANKING SYSTEM,  For: May 14  Filed by: MACHUCA LUIS</title>
   <link>http://www.streetinsider.com/SEC+Filings/Form++4++++++++++COLUMBIA+BANKING+SYSTEM%2C++For%3A+May+14++Filed+by%3A+MACHUCA+LUIS/26515030.html</link>
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   <title>Form  4          COLUMBIA BANKING SYSTEM,  For: May 14  Filed by: MACHUCA LUIS</title>
   <link>http://www.streetinsider.com/SEC+Filings/Form++4++++++++++COLUMBIA+BANKING+SYSTEM%2C++For%3A+May+14++Filed+by%3A+MACHUCA+LUIS/26515030.html</link>
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   <title>Form  4          COLUMBIA BANKING SYSTEM,  For: May 14  Filed by: Lund Randal Lee</title>
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   <pubDate>Mon, 18 May 2026 17:09:00 -0400</pubDate>
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   <title>Form  4          COLUMBIA BANKING SYSTEM,  For: May 14  Filed by: Lund Randal Lee</title>
   <link>http://www.streetinsider.com/SEC+Filings/Form++4++++++++++COLUMBIA+BANKING+SYSTEM%2C++For%3A+May+14++Filed+by%3A+Lund+Randal+Lee/26515013.html</link>
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   <title>Form  4          COLUMBIA BANKING SYSTEM,  For: May 14  Filed by: Finkelstein Mark A</title>
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   <pubDate>Mon, 18 May 2026 16:32:00 -0400</pubDate>
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