Trick David 4

4 · OCTAVE SPECIALTY GROUP INC · Filed Mar 5, 2026

Form 4

Period: 2026-03-03

Exec VP, CFO & Treasurer

Transactions

Exercise/Conversion
Common Stock
[F1]
2026-03-03+1,715→ 262,346 total
Tax Payment
Common Stock
[F2]
2026-03-03$5.60/sh−1,715$9,604→ 260,631 total
Exercise/Conversion
Restricted Stock Units
[F3][F4]
2026-03-03−11,505→ 111,934 total
→ Common Stock (11,505 underlying)
Exercise/Conversion
Deferred Share Units
[F5][F6]
2026-03-03−9,790→ 36,510 total
→ Common Stock (9,790 underlying)

Footnotes (6)

[F1]The reporting person acquired shares of common stock of Octave Specialty Group, Inc. (the "Company") upon the vesting and settlement of a portion of the reporting person's 2023 and 2024 restrictive stock unit ("RSU") awards.
[F2]Represents the amount of RSUs that were converted into shares of common stock and withheld by the Company to satisfy certain tax withholding obligations.
[F3]Each RSU represents a contingent right to receive one share of the Company's common stock.
[F4]Represents the aggregate amount of RSUs that vested.
[F5]Each deferred share unit ("DSU") represents a contingent right to receive one share of common stock of the Company.
[F6]Represents the aggregate amount of RSUs that were converted into an equivalent number of DSUs pursuant to the Company's Executive Stock Deferral Plan, which was designed to enable participants to elect to defer the settlement and income taxation of RSU and Performance Stock Unit awards in accordance with Section 409A of the Internal Revenue Code of 1986, as amended.

Signature

William White, attorney-in-fact|2026-03-05

Documents

1 file