OSG (OSG) CAO receives 8,067 RSUs and settles prior 835-unit award

Rhea-AI Filing Summary

Octave Specialty Group’s Chief Accounting Officer, Cristina E. Ahn, reported routine equity compensation activity and tax withholding transactions. On March 23, 2026, she received a grant of 8,067 restricted stock units (RSUs) as part of her 2026 Long Term Incentive Plan award, bringing her RSU holdings to 9,718.

Footnotes state each RSU represents a right to receive one share of common stock, vesting in three equal annual installments starting on March 23, 2027, then on March 23, 2028 and March 23, 2029. On March 10, 2026, 835 RSUs were settled into 835 shares of common stock, and 203 shares were withheld at $4.90 per share to cover tax obligations, leaving 632 common shares directly held after withholding.

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

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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^*

Ahn Cristina E.

(Last) (First) (Middle)

C/O OCTAVE SPECIALTY GROUP, INC.

ONE WORLD TRADE CENTER

(Street)

NEW YORK NEW YORK 10007

(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)
	Chief Accounting Officer

2a. Foreign Trading Symbol

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

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, par value $0.01 per share	03/10/2026		M		835(1)	A	(1)	835	D
Common Stock, par value $0.01 per share	03/10/2026		F		203(2)	D	$4.9	632	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)	03/10/2026		M			835(1)	(3)	(3)	Common Stock	835	(1)	1,651	D
Restricted Stock Units	(3)	03/23/2026		A		8,067		(4)	(4)	Common Stock	8,067	(4)	9,718	D

Explanation of Responses:

1. Represents the aggregate amount of restricted stock units ("RSUs") that were converted into shares of common stock of Octave Specialty Group, Inc. (the "Company") upon settlement of a portion of the reporting person's 2025 Long Term Incentive Plan award.

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 Company's common stock.

4. On March 23, 2026 the reporting person received a grant of 8,067 restricted stock units ("RSUs") as part of her 2026 Long Term Incentive Plan award. The RSUs will vest in three equal annual installments commencing March 23, 2027, March 23, 2028, and March 23, 2029.

Remarks:

	William J. White, attoney-in-fact	03/25/2026
	** 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)

FAQ

What insider transactions did OSG’s Cristina Ahn report on this Form 4?

Cristina E. Ahn reported an equity grant and routine equity settlement. She received 8,067 RSUs on March 23, 2026 and had 835 RSUs convert into common shares on March 10, 2026, with 203 shares withheld to cover tax obligations.

How many restricted stock units did OSG grant to Cristina Ahn?

Octave Specialty Group granted Cristina Ahn 8,067 RSUs on March 23, 2026. The filing explains this forms part of her 2026 Long Term Incentive Plan award, increasing her total RSU holdings to 9,718 units after the grant was recorded.

When will Cristina Ahn’s new OSG RSU grant vest?

The 8,067 RSUs will vest in three equal annual installments. According to the filing, vesting begins on March 23, 2027, with additional vesting on March 23, 2028 and March 23, 2029, subject to the standard conditions of the long-term incentive award.

What happened to the 835 OSG RSUs that settled in March 2026?

On March 10, 2026, 835 RSUs converted into 835 shares of Octave Specialty Group common stock. Of those, 203 shares were withheld by the company at $4.90 per share to satisfy tax obligations, leaving 632 shares directly held afterward.

Is the Form 4 for OSG showing an open-market stock purchase or sale?

The Form 4 shows no open-market buy or sell transactions. Instead, it records an RSU grant, an RSU-to-share conversion, and a tax-withholding disposition where 203 shares were withheld to pay taxes, all typical for equity compensation.

How many OSG RSUs does Cristina Ahn hold after the reported grant?

After the March 23, 2026 grant, Cristina Ahn holds a total of 9,718 RSUs. The filing describes this as the aggregate restricted stock unit balance following the new 8,067-unit award under the 2026 Long Term Incentive Plan.