X0609 4 2026-05-22 0 0001210708 Star Equity Holdings, Inc. STRR 0001548312 Eberwein Jeffrey E. false 53 FOREST AVENUE, SUITE 101 OLD GREENWICH CT 06870 1 1 1 0 Chief Executive Officer 0 Common Stock. 2026-05-22 4 P 0 694 11.06 A 1060078 D Common Stock. 2026-05-26 4 P 0 2414 11.51 A 1062492 D Common Stock. 2026-05-27 4 P 0 2288 11.76 A 1064780 D The price reported in Column 4 is a weighted average price, rounded to the nearest cent. These shares were purchased in multiple transactions at prices ranging from $10.90 to $11.26 on May 22, 2026, $11.40 to $11.51 on May 26, 2026, and $11.51 to $11.76 on May 27, 2026, inclusive. The Reporting Person undertakes to provide the Issuer and any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price such shares were purchased. Includes (i) 21,125 shares of restricted stock credited to the Reporting Person's account under the Issuer's 2009 Incentive Plan; (ii) 6,750 RSUs; and (iii) 1,036,905 shares of common stock. Excludes 1,690 shares indirectly owned in contributory 401(k) and IRA accounts. Each share of restricted stock and each RSU represents the right to receive, at settlement, one share of common stock. /s/ Jeffrey E. Eberwein 2026-05-27