Seaport Entertainment Group (SEG) withholds CEO shares for tax liability

Rhea-AI Filing Summary

Seaport Entertainment Group Inc. reported that Chief Executive Officer Matthew Morris Partridge had 4,544 shares of common stock withheld on July 31, 2026 to satisfy tax liability arising from the vesting of stock granted under the company’s 2024 Equity Incentive Plan. The tax-withholding disposition was valued at $26.23 per share, and following this event he directly owns 111,071 shares of Seaport Entertainment common stock. This was a tax-related share withholding rather than an open-market sale.

Insider Trade Summary

Net Seller: 4,544 shares

Net Sell 1 txn

Insider PARTRIDGE MATTHEW MORRIS

Role Chief Executive Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F1	4,544	$26.23	$119K

Holdings After Transaction: Common Stock — 111,071 shares (Direct)

Footnotes (1)

1. F1. On July 31, 2026, Seaport Entertainment Group Inc. (the "Issuer") withheld 4,544 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 taxes: 4,544 shares Per-share value for withholding: $26.23 per share Shares owned after transaction: 111,071 shares +1 more

4 metrics

Shares withheld for taxes 4,544 shares Common stock withheld from CEO to cover tax on vested equity

Per-share value for withholding $26.23 per share Value used for the tax-withholding disposition on July 31, 2026

Shares owned after transaction 111,071 shares Direct common stock holdings of CEO following withholding

Transaction date July 31, 2026 Date of tax-withholding disposition of common stock

Key Terms

tax liability, vesting, 2024 Equity Incentive Plan, Reporting Person

4 terms

tax liability financial

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

vesting financial

"incident to the vesting of shares of common stock granted by the Issuer"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

2024 Equity Incentive Plan financial

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

Reporting Person regulatory

"withheld 4,544 shares of common stock of the Issuer from the Reporting Person"

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

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/03/2026 - 04:45 PM Accepted by SEC EDGAR 08/03/2026 - 04:45 PM Learn about SEC filing dates

FAQ

What insider transaction did Seaport Entertainment (SEG) disclose for its CEO?

Seaport Entertainment’s CEO Matthew Morris Partridge reported a tax-withholding disposition where the company withheld 4,544 shares of common stock to cover taxes due on vested equity granted under the 2024 Equity Incentive Plan.

How many Seaport Entertainment (SEG) shares were withheld for taxes from the CEO?

The company withheld 4,544 shares of Seaport Entertainment common stock from CEO Matthew Morris Partridge to pay his tax liability related to the vesting of stock awards granted under the 2024 Equity Incentive Plan.

At what value were the withheld SEG shares recorded for the CEO’s tax payment?

The withheld shares were valued at $26.23 per share. This per-share value was used to determine the amount of stock needed to cover the CEO’s tax liability triggered by the vesting of equity awards.

How many Seaport Entertainment (SEG) shares does the CEO own after this transaction?

After the tax-related withholding of 4,544 shares, CEO Matthew Morris Partridge directly owns 111,071 shares of Seaport Entertainment common stock, as reported in the insider transaction disclosure for July 31, 2026.

Was the Seaport Entertainment (SEG) CEO’s share withholding done under a Rule 10b5-1 plan?

The disclosure indicates the transaction was not made under a Rule 10b5-1 trading plan. It is specifically characterized as a tax-withholding event tied to the vesting of stock granted under the 2024 Equity Incentive Plan.

Why did Seaport Entertainment (SEG) withhold stock from its CEO on July 31, 2026?

On July 31, 2026, Seaport Entertainment withheld 4,544 shares of common stock from its CEO to pay the tax liability incident to the vesting of shares granted under the company’s 2024 Equity Incentive Plan.

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)
07/31/2026

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	07/31/2026		F(1)		4,544	D	$26.23	111,071	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 July 31, 2026, Seaport Entertainment Group Inc. (the "Issuer") withheld 4,544 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	08/03/2026
	** 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)