BARUFFI KUMI YAMAMOTO has filed 44 insider transactions across 1 company since December 2022.
Most recent transaction: a tax payment of 937 shares of COLUMBIA BANKING SYSTEM, INC. ($COLB) on March 13, 2026.
Activity breakdown: 2 open-market purchases and 1 sale.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| March 13, 2026 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | EVP General Counsel, Corp Sec | F | Common Stock | 937 | $26.23 | 53,715.0000 | 299,147,000 | 1.71% | 0.00% |
| March 13, 2026 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | EVP General Counsel, Corp Sec | M | Common Stock | 2381 | $26.23 | 54,652.0000 | 299,147,000 | 4.56% | 0.00% |
| March 13, 2026 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | EVP General Counsel, Corp Sec | S | Common Stock | 937 | $26.23 | 53,715.0000 | 299,147,000 | 1.71% | 0.00% |
| March 13, 2026 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | EVP General Counsel, Corp Sec | M | Restricted Stock Unit | 2381 | $0.00 | 13,083.0000 | 299,147,000 | 15.40% | 0.00% |
| March 1, 2026 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | EVP General Counsel, Corp Sec | F | Common Stock | 1799 | $28.45 | 52,271.0000 | 299,147,000 | 3.33% | 0.00% |
| Feb. 18, 2026 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | EVP General Counsel, Corp Sec | A | Restricted Stock Unit | 8322 | $31.24 | 15,464.0000 | 299,147,000 | 116.52% | 0.00% |
| Feb. 15, 2026 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | EVP General Counsel, Corp Sec | F | Common Stock | 1036 | $31.49 | 54,070.0000 | 299,147,000 | 1.88% | 0.00% |
| Feb. 2, 2026 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | EVP General Counsel, Corp Sec | A | Common Stock | 5093 | $29.69 | 57,216.0000 | 299,147,000 | 9.77% | 0.00% |
| Feb. 2, 2026 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | EVP General Counsel, Corp Sec | F | Common Stock | 2110 | $29.69 | 55,106.0000 | 299,147,000 | 3.69% | 0.00% |
| Jan. 20, 2026 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | EVP General Counsel, Corp Sec | D | Common Stock | 632 | $0.00 | 53,631.0000 | 299,147,000 | 1.16% | 0.00% |
| Jan. 20, 2026 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | EVP General Counsel, Corp Sec | F | Common Stock | 1508 | $28.35 | 52,123.0000 | 299,147,000 | 2.81% | 0.00% |
| Feb. 28, 2025 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | General Counsel, Corporate Sec | F | Common Stock | 1799 | $26.73 | 54,263.0000 | 209,536,323 | 3.21% | 0.00% |
| Feb. 25, 2025 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | General Counsel, Corporate Sec | A | Performance Restricted Stock Unit | 3571 | $26.60 | 20,852.0000 | 209,536,323 | 20.66% | 0.00% |
| Feb. 25, 2025 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | General Counsel, Corporate Sec | A | Performance Restricted Stock Unit | 3571 | $26.60 | 17,281.0000 | 209,536,323 | 26.05% | 0.00% |
| Feb. 25, 2025 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | General Counsel, Corporate Sec | A | Restricted Stock Unit | 7142 | $26.60 | 7,142.0000 | 209,536,323 | 9999.99% | 0.00% |
| Feb. 14, 2025 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | General Counsel, Corporate Sec | F | Common Stock | 442 | $27.41 | 57,093.0000 | 209,536,323 | 0.77% | 0.00% |
| Feb. 14, 2025 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | General Counsel, Corporate Sec | A | Common Stock | 1012 | $27.41 | 57,535.0000 | 209,536,323 | 1.79% | 0.00% |
| Feb. 14, 2025 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | General Counsel, Corporate Sec | F | Common Stock | 1031 | $27.41 | 56,062.0000 | 209,536,323 | 1.81% | 0.00% |
| Jan. 1, 2025 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | General Counsel, Corporate Sec | F | Common Stock | 772 | $27.01 | 56,523.0000 | 209,536,323 | 1.35% | 0.00% |
| Jan. 1, 2025 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | General Counsel, Corporate Sec | F | Common Stock | 689 | $27.01 | 57,295.0000 | 209,536,323 | 1.19% | 0.00% |
| March 1, 2024 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | General Counsel, Corporate Sec | A | Performance Restricted Stock Unit | 6855 | $17.87 | 13,710.0000 | 208,585,000 | 100.00% | 0.00% |
| March 1, 2024 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | General Counsel, Corporate Sec | A | Common Stock | 13710 | $17.87 | 57,984.0000 | 208,585,000 | 30.97% | 0.01% |
| March 1, 2024 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | General Counsel, Corporate Sec | A | Performance Restricted Stock Unit | 6855 | $17.87 | 6,855.0000 | 208,585,000 | 9999.99% | 0.00% |
| Feb. 15, 2024 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | General Counsel, Corporate Sec | A | Common Stock | 673 | $19.01 | 43,262.0000 | 208,585,000 | 1.58% | 0.00% |
| Feb. 15, 2024 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | General Counsel, Corporate Sec | A | Common Stock | 1012 | $19.01 | 44,274.0000 | 208,585,000 | 2.34% | 0.00% |
| Jan. 1, 2024 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | General Counsel, Corporate Sec | F | Common Stock | 461 | $26.68 | 42,589.0000 | 208,585,000 | 1.07% | 0.00% |
| Jan. 1, 2024 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | General Counsel, Corporate Sec | F | Common Stock | 461 | $26.68 | 43,050.0000 | 208,585,000 | 1.06% | 0.00% |
| June 30, 2023 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | General Counsel, Corporate Sec | P | Common Stock | 854 | $18.25 | 43,511.0000 | 208,200,000 | 2.00% | 0.00% |
| March 27, 2023 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | General Counsel, Corporate Sec | F | Common Stock | 507 | $20.81 | 42,657.0000 | 208,200,000 | 1.17% | 0.00% |
| Feb. 28, 2023 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | EVP General Counsel | A | Common | 1020 | $0.00 | 39,942.0000 | 129,320,962 | 2.62% | 0.00% |
| Feb. 28, 2023 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | EVP General Counsel | A | Common | 1702 | $0.00 | 41,644.0000 | 129,320,962 | 4.26% | 0.00% |
| Feb. 28, 2023 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | EVP General Counsel | A | Common | 1520 | $0.00 | 43,164.0000 | 129,320,962 | 3.65% | 0.00% |
| Feb. 28, 2023 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | EVP General Counsel | A | Common | 1020 | $0.00 | 38,922.0000 | 129,320,962 | 2.69% | 0.00% |
| Feb. 21, 2023 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | EVP General Counsel | F | Common | 609 | $30.77 | 26,055.0000 | 129,320,962 | 2.28% | 0.00% |
| Feb. 21, 2023 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | EVP General Counsel | A | Common | 7898 | $0.00 | 33,953.0000 | 129,320,962 | 30.31% | 0.01% |
| Feb. 21, 2023 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | EVP General Counsel | A | Common | 3948 | $0.00 | 37,901.0000 | 129,320,962 | 11.63% | 0.00% |
| Feb. 21, 2023 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | EVP General Counsel | A | Common | 1456 | $0.00 | 26,664.0000 | 129,320,962 | 5.78% | 0.00% |
| Feb. 15, 2023 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | EVP General Counsel | A | Common | 859 | $32.05 | 24,675.0000 | 129,320,962 | 3.61% | 0.00% |
| Feb. 15, 2023 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | EVP General Counsel | F | Common | 458 | $32.05 | 25,208.0000 | 129,320,962 | 1.78% | 0.00% |
| Feb. 15, 2023 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | EVP General Counsel | A | Common | 1012 | $32.05 | 25,666.0000 | 129,320,962 | 4.10% | 0.00% |
| Feb. 15, 2023 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | EVP General Counsel | F | Common | 305 | $32.05 | 24,654.0000 | 129,320,962 | 1.22% | 0.00% |
| Feb. 15, 2023 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | EVP General Counsel | A | Common | 673 | $32.05 | 24,959.0000 | 129,320,962 | 2.77% | 0.00% |
| Feb. 15, 2023 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | EVP General Counsel | F | Common | 389 | $32.05 | 24,286.0000 | 129,320,962 | 1.58% | 0.00% |
| Dec. 30, 2022 | COLUMBIA BANKING SYSTEM, INC. | $COLB | BARUFFI KUMI YAMAMOTO | EVP General Counsel | P | Common | 232 | $26.84 | 23,816.0000 | 129,065,476 | 0.98% | 0.00% |