Claude LeBlanc - 09 Jul 2026 Form 4 Insider Report for OCTAVE SPECIALTY GROUP INC (OSG)

Reporting relationship: Chief Executive Officer, Director
Issuer ticker: OSG
Reported as of: 09 Jul 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 13 Jul 2026, 16:05:44 UTC
Prior SEC filing: 25 Mar 2026
Source filing: View source filing
Reporting owner signature: Reid Powell, attorney-in-fact

Key filing fact

Claude LeBlanc filed Form 4 for OCTAVE SPECIALTY GROUP INC (OSG) on 13 Jul 2026.

Key facts

This page summarizes Claude LeBlanc's Form 4 filing for OCTAVE SPECIALTY GROUP INC (OSG).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 13 Jul 2026, 16:05.

Change

Previous filing in this sequence was filed on 25 Mar 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: Reid Powell, attorney-in-fact
Signature date: 13 Jul 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: +39,380
Change %: +3.8%
Price
Shares after: 1,087,011
Date: 09 Jul 2026
Ownership: Direct
Footnotes: F1

OSG transaction

Common Stock

Tax liability

Transaction value
Shares: -21,777
Change %: -2%
Price: $6.08^*
Shares after: 1,065,234
Date: 09 Jul 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: -39,380
Change %: -7.6%
Price: $0.000000^*
Shares after: 480,832
Date: 09 Jul 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 39,380
Exercise price
Footnotes: F3, F4

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 4 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 restricted stock unit ("RSU") awards as part of their 2025 Long Term Incentive Plan.

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

The RSUs vested pursuant to the first of three equal annual installments under the reporting person's 2025 Long Term Incentive Plan award, which vests in equal installments on July 9, 2026, July 9, 2027, and July 9, 2028.

SEC remarks

Exhibit 24.1. Power of Attorney