Summit Midstream (SMC) SVP nets 3,593 shares, sells 1,066 for tax

Rhea-AI Filing Summary

Summit Midstream Corp executive Matthew B. Sicinski, Senior VP and CAO, reported equity award activity and related tax withholding. On January 16, 2026, 3,593 corporation restricted stock units were exercised and converted to common stock at an exercise price of $0, reflecting the vesting of part of a prior award. Each unit is economically equivalent to one share of common stock.

On the same date, 1,066 common shares were withheld at $26.81 per share to cover tax liabilities tied to the vesting. After these transactions, Sicinski directly owned 31,347 common shares and 29,362 corporation restricted stock units, which will vest over time under earlier grant terms and may settle in shares or cash at the issuer’s discretion.

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^*

Sicinski Matthew B.

(Last) (First) (Middle)

C/O SUMMIT MIDSTREAM PARTNERS, LP

910 LOUISIANA STREET, SUITE 4200

(Street)

HOUSTON TX 77002

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Summit Midstream Corp [ SMC ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Senior VP and CAO

3. Date of Earliest Transaction (Month/Day/Year)
01/16/2026

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

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

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

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	01/16/2026		M		3,593	A	(1)	32,413	D
Common Stock	01/16/2026		F		1,066(2)	D	$26.81	31,347	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
Corporation Restricted Stock Units	(1)	01/16/2026		M			3,593	(3)	(4)	Common Stock	3,593	$0	29,362(5)	D

Explanation of Responses:

1. Each corporation restricted stock unit is the economic equivalent of one common stock.

2. Common stocks being withheld to pay tax liability.

3. One-third of the corporation restricted stock units subject to the original award agreement vested on January 16, 2026, with the remaining corporation restricted stock units subject to vesting on the third anniversary of the January 18, 2024 reference date, subject to continued employment. The Reporting Person received distribution equivalent rights ("DERs") for each corporation restricted stock unit, providing for payment on the vesting date of a lump sum of cash equal to the accrued distributions from and after the grant date of the corporation restricted stock units.

4. The corporation restricted stock units and associated DERs do not expire. The corporation restricted stock units are settled upon vesting in common stocks (on a one-for-one basis) or in cash, at the discretion of the Issuer.

5. This total includes corporation restricted stock units from other tranches with different vesting dates.

Remarks:

	/s/ James D. Johnston, Attorney-in-Fact for Matthew B. Sicinski	01/21/2026
	** 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.
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FAQ

What insider transaction did Summit Midstream Corp (SMC) report for Matthew B. Sicinski?

The filing shows that Matthew B. Sicinski, Senior VP and CAO of Summit Midstream Corp, had 3,593 corporation restricted stock units vest and convert into common stock on January 16, 2026, followed by the withholding of 1,066 common shares to satisfy tax obligations.

How many Summit Midstream Corp (SMC) restricted stock units vested in this Form 4?

On January 16, 2026, 3,593 corporation restricted stock units vested and were exercised at an exercise price of $0, converting into an equal number of Summit Midstream Corp common shares.

Why were 1,066 Summit Midstream Corp (SMC) shares sold or withheld at $26.81?

The Form 4 indicates that 1,066 common shares at $26.81 per share were designated with transaction code F, which the footnote explains as common stock being withheld to pay tax liability arising from the vesting of restricted stock units.

How many Summit Midstream Corp (SMC) shares does Matthew B. Sicinski own after these transactions?

After the reported transactions, Matthew B. Sicinski directly owned 31,347 Summit Midstream Corp common shares, as shown in the Form 4 table for non-derivative securities.

How many Summit Midstream Corp (SMC) restricted stock units does the insider still hold?

Following the vesting of 3,593 units, the Form 4 states that Sicinski beneficially owned 29,362 corporation restricted stock units, which include tranches with different vesting dates.

How are Summit Midstream Corp (SMC) restricted stock units settled for this insider?

The footnotes explain that each corporation restricted stock unit is economically equivalent to one common share and is settled upon vesting in common stock on a one-for-one basis or in cash, at Summit Midstream Corp’s discretion. The units and related distribution equivalent rights do not expire.