Octave Specialty Group CFO's 66,519 stock units vest

The reported activity also includes a deferral-plan conversion into 63,472 DSUs and tax withholding of 3,047 common shares.

Rhea-AI Filing Summary

Octave Specialty Group Inc. (OSG) Executive Vice President, CFO & Treasurer David Trick reported 66,519 restricted stock units vesting on October 3, 2026. On that date, 3,047 common shares were issued upon vesting and settlement and withheld by the company for tax obligations at a reported $4.60 per share. Separately, 63,472 RSUs were converted into an equivalent number of deferred share units under the Executive Stock Deferral Plan. Reported post-transaction balances were 58,459 RSUs and 120,015 DSUs.

Insider Trade Summary

129,991 shares exercised/converted

Exercise 4 txns

Insider Trick David

Role Exec VP, CFO & Treasurer

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units F3, F4	66,519	$0.00	$0.00
Exercise	Deferred Share Units F5, F6	63,472	$0.00	$0.00
Exercise	Common Stock F1	3,047	--	--
Tax Withholding	Common Stock F2	3,047	$4.60	$14K

Holdings After Transaction: Restricted Stock Units — 58,459 contracts (Direct); Deferred Share Units — 120,015 contracts (Direct); Common Stock — 267,096 shares (Direct)

Footnotes (6)

1. F1. The reporting person acquired shares of common stock 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.
2. 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.
3. F3. Each RSU represents a contingent right to receive one share of the common stock of the Company's common stock.
4. F4. Represents the aggregate amount of RSUs that vested.
5. F5. Each deferred share unit ("DSU") represents a contingent right to receive one share of common stock of the Company.
6. 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.

Key Figures

RSUs vested: 66,519 RSUs Common shares withheld for tax obligations: 3,047 shares Reported per-share price: $4.60 per share +3 more

6 metrics

RSUs vested 66,519 RSUs October 3, 2026

Common shares withheld for tax obligations 3,047 shares October 3, 2026

Reported per-share price $4.60 per share Shares withheld for tax obligations on October 3, 2026

RSUs converted into DSUs 63,472 RSUs Under the Executive Stock Deferral Plan on October 3, 2026

RSUs following transaction 58,459 RSUs Reported after the October 3, 2026 transaction

DSUs following transaction 120,015 DSUs Reported after the October 3, 2026 transaction

Key Terms

restricted stock unit, deferred share unit, Executive Stock Deferral Plan, Section 409A

4 terms

restricted stock unit technical

"restricted stock unit ("RSU") awards"

A restricted stock unit is a promise from a company to give an employee shares of stock after certain conditions are met, like staying with the company for a set amount of time. It’s like earning a bonus that turns into company stock once you’ve proven your commitment, making it a way to motivate and reward employees.

deferred share unit technical

"deferred share unit ("DSU")"

Executive Stock Deferral Plan financial

"pursuant to the Company's Executive Stock Deferral Plan"

Section 409A regulatory

"in accordance with Section 409A of the Internal Revenue Code"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many OSG RSUs vested, and how many shares were withheld for taxes?

David Trick reported 66,519 RSUs vesting on October 3, 2026, and 3,047 common shares were withheld by the company for tax obligations at a reported $4.60 per share. He also reported converting 63,472 RSUs into DSUs under the Executive Stock Deferral Plan.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 4 Insider Transactions: What Each Field Means →

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Available on EDGAR 10/06/2026 - 07:20 PM Accepted by SEC EDGAR 10/06/2026 - 07:20 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Trick David

(Last) (First) (Middle)

C/O OCTAVE SPECIALTY GROUP, INC.

40 WALL STREET, 55TH FLOOR

(Street)

NEW YORK NEW YORK 10005

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
OCTAVE SPECIALTY GROUP INC [ OSG ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Exec VP, CFO & Treasurer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/03/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	10/03/2026		M		3,047	A	(1)	270,143	D
Common Stock	10/03/2026		F		3,047	D	$4.6	267,096(2)	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Units	(3)	10/03/2026		M			66,519	(4)	(4)	Common Stock	66,519	$0	58,459	D
Deferred Share Units	(5)	10/03/2026		M		63,472		(6)	(6)	Common Stock	63,472	$0	120,015	D

Explanation of Responses:

1. The reporting person acquired shares of common stock 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.

2. Represents the amount of RSUs that were converted into shares of common stock and withheld by the Company to satisfy certain tax withholding obligations.

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

4. Represents the aggregate amount of RSUs that vested.

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

6. 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.

Remarks:

	Reid Powell, attorney-in-fact	10/06/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)