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Columbia Banking System EVP and Chief Accounting Officer Lakely Brock exercised restricted stock units and sold a small portion of the resulting shares. On March 13, 2026, 846 Restricted Stock Units converted into 846 shares of common stock on a one-for-one basis. The common shares were acquired at $26.23 per share, then 211 shares were sold at $26.23 per share. After these transactions, Brock directly owned 11,104 shares of common stock. According to a prior grant dated February 25, 2025, 2,537 Restricted Stock Units vest in three annual installments beginning March 13, 2026.
COLUMBIA BANKING SYSTEM EVP and General Counsel Kumi Yamamoto Baruffi exercised restricted stock units and sold a portion of the resulting shares. On March 13, 2026, 2,381 Restricted Stock Units were converted into 2,381 shares of common stock at an effective price of $0.00 per share. On the same date, 937 common shares were sold at $26.23 per share, leaving 53,715 common shares held directly after the sale. A prior grant of 7,142 Restricted Stock Units made on February 25, 2025 vests in three annual installments beginning March 13, 2026.
COLUMBIA BANKING SYSTEM, INC. executive Drew K. Anderson, EVP Chief Admin Officer, exercised 2,506 Restricted Stock Units into the same number of common shares on March 13, 2026. The RSUs convert to common stock on a one-for-one basis.
To cover tax obligations, 1,215 common shares were withheld at $26.23 per share, a non-market disposition rather than an open-market sale. After these transactions, Anderson directly holds 21,969 common shares. A prior grant of 7,518 RSUs vests in three annual installments beginning on March 13, 2026.
Columbia Banking System EVP Aaron James Deer exercised restricted stock units into common shares as part of his compensation. On March 13, 2026 he converted 1,567 restricted stock units into common stock, with 617 common shares withheld at $26.23 per share to cover tax obligations, rather than sold in the market.
Following these transactions, he directly owns 41,875 common shares and 7,133 restricted stock units. The RSUs convert into common stock on a one-for-one basis. They stem from a 4,699-unit grant made on February 25, 2025, vesting in three annual installments beginning March 13, 2026.
COLUMBIA BANKING SYSTEM, INC. Senior Executive VP Nixon Torran B reported open-market sales of common stock. On 2026-03-04, he sold 2,240 shares at an average price of $28.85, and on 2026-03-03 he sold 2,241 shares at $28.25.
After these transactions, he held 98,229 shares directly. Indirect holdings included 3,650 shares by a family trust and 1,876 shares by a 401(k) as of 2026-03-03. An open-market sale was made pursuant to a Rule 10b5-1 trading plan established on 2025-11-25.
Issuer filed a Form 144 reporting a proposed sale of 2,240 common shares tied to a restricted stock vesting on 03/01/2026 as compensation. The filing also records that Torran B. Nixon sold 2,241 common shares on 03/03/2026 for $63,308.25.
COLUMBIA BANKING SYSTEM, INC. Chair, President and CEO Clint Stein reported a tax-related share disposition under a Form 4. On March 1, 2026, 9,789 shares of common stock were disposed of at $28.45 per share to satisfy tax withholding obligations. After this transaction, Stein’s directly held common stock totaled 140,564 shares.
COLUMBIA BANKING SYSTEM, INC. executive Andrew H. Ognall reported a tax-related share disposition on Common Stock. An automatic tax-withholding transaction disposed of 1,304 shares at $28.45 per share, leaving 72,702 shares held directly and 2,635 shares held indirectly through a 401(k) plan.
Columbia Banking System Senior Executive VP Torran B. Nixon reported a tax-related share disposition. On Common Stock, 2,980 shares were withheld at $28.45 per share to cover taxes, a non-open-market transaction coded as a tax-withholding disposition.
After this event, Nixon directly held 102,710 common shares. Indirectly, 3,650 shares were held by a family trust and 1,876 shares were held through a 401(k) account, reflecting total reported beneficial ownership across direct and indirect accounts.