X0609 4 2026-10-01 0 0000874501 OCTAVE SPECIALTY GROUP INC OSG 0001559518 Stein Jeffrey Scott false C/O OCTAVE SPECIALTY GROUP, INC. 40 WALL STREET, 55TH FLOOR NEW YORK NY 10005 1 0 0 0 0 Restricted Stock Units 2026-10-01 4 A 0 8224 0 A Common Stock 8224 30815 D Each restricted stock unit ("RSU") represents a contingent right to receive one share of the common stock of Octave Specialty Group, Inc. (the "Company"). RSU's granted on October 1, 2026 shall vest one year later on October 1, 2027. RSUs that have become vested shall settle and convert into shares of common stock upon the earlier of the vesting date or the date that the reporting person resigns from, or otherwise ceases to be a member of, the Board of Directors of the Company, unless otherwise deferred upon the election of the reporting person. Exhibit 24.1 Power of Attorney Reid Powell, attorney-in-fact 2026-10-05