Seaport CEO has 1,804 shares withheld for taxes

CEO Matthew Morris Partridge had Seaport Entertainment Group shares withheld to cover taxes on vested equity, leaving him directly holding over 100,000 shares.

Rhea-AI Filing Summary

Seaport Entertainment Group Inc. (SEG) reported that Chief Executive Officer and director Matthew Morris Partridge had 1,804 shares of common stock withheld on September 18, 2026 to satisfy tax liability related to vesting of equity awards under the company’s 2024 Equity Incentive Plan. The shares were valued at $24.14 per share for this tax-withholding transaction, and Partridge now directly holds 109,267 shares of Seaport Entertainment Group Inc. common stock. No Rule 10b5-1 trading plan is reported for this transaction.

Insider Trade Summary

Tax Withholding: 1,804 shares

Tax Withholding 1 txn

Insider PARTRIDGE MATTHEW MORRIS

Role Chief Executive Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F1	1,804	$24.14	$44K

Holdings After Transaction: Common Stock — 109,267 shares (Direct)

Footnotes (1)

1. F1. On September 18, 2026, Seaport Entertainment Group Inc. (the "Issuer") withheld 1,804 shares of common stock of the Issuer from the Reporting Person for payment of the tax liability incident to the vesting of shares of common stock granted by the Issuer pursuant to the terms of the Issuer's 2024 Equity Incentive Plan.

Key Figures

Shares withheld for tax liability: 1,804 shares Valuation price per share: $24.14 per share Shares held after transaction: 109,267 shares

3 metrics

Shares withheld for tax liability 1,804 shares Common stock withheld on September 18, 2026 to pay tax liability on vesting

Valuation price per share $24.14 per share Value used for the 1,804-share tax-withholding disposition

Shares held after transaction 109,267 shares Common stock directly owned by CEO after the September 18, 2026 transaction

Key Terms

Payment of tax liability, withheld, 2024 Equity Incentive Plan

3 terms

Payment of tax liability financial

"for payment of the tax liability incident to the vesting of shares"

withheld financial

"the Issuer withheld 1,804 shares of common stock of the Issuer"

2024 Equity Incentive Plan financial

"granted by the Issuer pursuant to the terms of the Issuer's 2024 Equity Incentive Plan"

FAQ

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

What insider transaction did SEG report for CEO Matthew Morris Partridge?

SEG reported that CEO Matthew Morris Partridge had 1,804 shares of common stock withheld on September 18, 2026 to pay tax liability arising from vesting of equity awards under the 2024 Equity Incentive Plan.

At what price were the withheld SEG shares valued in this Form 4?

The 1,804 withheld SEG shares were valued at $24.14 per share for the tax-withholding disposition related to the vesting of common stock granted under the company’s 2024 Equity Incentive Plan.

How many SEG shares does the CEO hold after this reported transaction?

After the September 18, 2026 tax-withholding disposition, CEO Matthew Morris Partridge directly holds 109,267 shares of Seaport Entertainment Group Inc. common stock.

Was the SEG insider transaction made under a Rule 10b5-1 trading plan?

No. The filing indicates that the Rule 10b5-1 checkbox is not marked, so this tax-withholding disposition of 1,804 shares was not reported as being made under a Rule 10b5-1 trading plan.

What caused the tax-withholding share disposition reported by SEG?

The disposition occurred because Seaport Entertainment Group Inc. withheld 1,804 shares of common stock from the CEO to pay the tax liability that arose when previously granted shares vested under the 2024 Equity Incentive Plan.

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

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Available on EDGAR 09/22/2026 - 04:40 PM Accepted by SEC EDGAR 09/22/2026 - 04:40 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^*

PARTRIDGE MATTHEW MORRIS

(Last) (First) (Middle)

199 WATER STREET

28TH FLOOR

(Street)

NEW YORK NEW YORK 10038

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Seaport Entertainment Group Inc. [ SEG ]

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

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Executive Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/18/2026

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	09/18/2026		F(1)		1,804	D	$24.14	109,267	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

Explanation of Responses:

1. On September 18, 2026, Seaport Entertainment Group Inc. (the "Issuer") withheld 1,804 shares of common stock of the Issuer from the Reporting Person for payment of the tax liability incident to the vesting of shares of common stock granted by the Issuer pursuant to the terms of the Issuer's 2024 Equity Incentive Plan.

	/s/ Lenah Elaiwat, Attorney-in-Fact	09/22/2026
	** 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)