Claude LeBlanc - 03 Mar 2026 Form 4 Insider Report for OCTAVE SPECIALTY GROUP INC (OSG)

Reporting relationship: Chief Executive Officer, Director
Issuer ticker: OSG
Reported as of: 03 Mar 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 05 Mar 2026, 17:14:27 UTC
Prior SEC filing: 05 Jan 2026
Next SEC filing: 25 Mar 2026
Source filing: View source filing
Reporting owner signature: William White, attorney-in-fact

Key filing fact

Claude LeBlanc filed Form 4 for OCTAVE SPECIALTY GROUP INC (OSG) on 05 Mar 2026.

Key facts

This page summarizes Claude LeBlanc's Form 4 filing for OCTAVE SPECIALTY GROUP INC (OSG).
4 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 05 Mar 2026, 17:14.

Change

Previous filing in this sequence was filed on 05 Jan 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001380820 Primary reporting owner

LeBlanc Claude

Relationship: Chief Executive Officer, Director
Address: C/O OCTAVE SPECIALTY GROUP, INC., 40 WALL STREET, 55TH FLOOR, NEW YORK
Signature: William White, attorney-in-fact
Signature date: 04 Mar 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

OSG transaction

Common Stock

Options Exercise

Transaction value
Shares: +24,548
Change %: +2.4%
Price: $0.000000^*
Shares after: 1,058,325
Date: 03 Mar 2026
Ownership: Direct
Footnotes: F1

OSG transaction

Common Stock

Tax liability

Transaction value
Shares: -10,694
Change %: -1%
Price: $5.60^*
Shares after: 1,047,631
Date: 03 Mar 2026
Ownership: Direct
Footnotes: F2

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

OSG transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares: -47,130
Change %: -9.2%
Price: $0.000000^*
Shares after: 466,487
Date: 03 Mar 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 47,130
Exercise price
Footnotes: F3, F4

OSG transaction Derivative

Deferred Share Units

Options Exercise

Transaction value
Shares: +22,582
Change %: +13%
Price: $0.000000^*
Shares after: 197,543
Date: 03 Mar 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 22,582
Exercise price
Footnotes: F5, F6

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 6 footnotes

Footnote 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.

Footnote 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.

Footnote F3

Each RSU represents a contingent right to receive one share of the Company's common stock.

Footnote F4

Represents the aggregate amount of RSUs that vested.

Footnote F5

Each deferred share unit ("DSU") represents a contingent right to receive one share of common stock of the Company.

Footnote 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.