Summit Midstream Corp (SMC) CEO details major RSU grants and vesting in Form 4

Rhea-AI Filing Summary

Summit Midstream Corp Chairman, President and CEO Heath Deneke reported a mix of equity awards and vesting activity. On March 16, 2026, he received two grants of corporation restricted stock units totaling 119,614 units, each economically equivalent to one share of common stock.

Earlier, on March 13, 2026, 103,939 corporation restricted stock units vested and were settled into common stock through derivative exercises. To cover tax liabilities, 40,297 common shares were withheld at a price of $30.29 per share. Following these transactions, he directly held 354,350 shares of common stock.

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^*

Deneke J Heath

(Last) (First) (Middle)

C/O SUMMIT MIDSTREAM CORPORATION

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)
	Chairman, President and CEO

3. Date of Earliest Transaction (Month/Day/Year)
03/13/2026

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	03/13/2026		M		58,049	A	(1)	348,757	D
Common Stock	03/13/2026		F		22,239(2)	D	$30.29	326,518	D
Common Stock	03/13/2026		M		15,875	A	(1)	342,393	D
Common Stock	03/13/2026		F		6,247(2)	D	$30.29	336,146	D
Common Stock	03/13/2026		M		30,015	A	(1)	366,161	D
Common Stock	03/13/2026		F		11,811(2)	D	$30.29	354,350	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)	03/13/2026		M			58,049	(3)	(4)	Common Stock	58,049	$0	225,507	D
Corporation Restricted Stock Units	(1)	03/13/2026		M			15,875	(5)	(4)	Common Stock	15,875	$0	209,632	D
Corporation Restricted Stock Units	(1)	03/13/2026		M			30,015	(6)	(4)	Common Stock	30,015	$0	179,617	D
Corporation Restricted Stock Units	(1)	03/16/2026		A		59,807		(7)	(4)	Common Stock	59,807	$0	239,424	D
Corporation Restricted Stock Units	(1)	03/16/2026		A		59,807		(8)	(4)	Common Stock	59,807	$0	297,251(9)	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. The corporation restricted stock units subject to the original award agreement vested on March 13, 2026. 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. One-third of the corporation restricted stock units (rounded down to the nearest whole number of units, except in the case of the final vesting date) vested on March 13, 2026, with the remaining corporation restricted stock units vesting on the second and third anniversaries of the March 14, 2025, reference date, subject to continued employment and accelerated vesting as provided in the applicable award agreement. The Reporting Person received 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.

6. The final one-third of the corporation restricted stock units subject to the original award agreement vested on March 13, 2026. The Reporting Person received 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.

7. One-third of the corporation restricted stock units (rounded down to the nearest whole number of units, except in the case of the final vesting date) shall vest on each of the first, second and third anniversaries of the March 16, 2026, reference date, subject to continued employment and accelerated vesting as provided in the applicable award agreement. The Reporting Person will receive 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.

8. The corporation restricted stock units shall vest if and to the extent that the corporation restricted stock units are earned during the performance period from January 1, 2026 through December 31, 2028, which will depend on whether the performance criteria are achieved as determined by the committee as soon as reasonably practicable, but no later than sixty (60) days following December 31, 2028, the last day of the Performance Period. The vesting of the corporation restricted stock units is subject to continued employment and accelerated vesting as provided in the applicable award agreement. The Reporting Person will receive 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.

9. This total includes corporation restricted stock units from other tranches with different vesting dates. On March 16, 2026, when the original award agreement vested, it was certified at an achievement level of 96.7% of the target number of corporation restricted stock units. The remaining 3.3% of the target corporation restricted stock units that were not earned based on the certified performance level were forfeited. The difference between the number of outstanding awards reflected in the Reporting Person's brokerage account and the number previously reported is attributable to this certification and the corresponding forfeiture of the unearned portion of the original award.

Remarks:

	/s/ James D. Johnston, Attorney-in-Fact for J. Heath Deneke	03/17/2026
	** Signature of Reporting Person	Date
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FAQ

What did Summit Midstream Corp CEO Heath Deneke report in this Form 4 for SMC?

Heath Deneke reported equity compensation activity, including new restricted stock unit grants and vesting of prior awards. Several corporation restricted stock units converted into common stock, and a portion of the resulting shares was withheld to satisfy tax liabilities rather than sold in the open market.

How many restricted stock units were granted to the Summit Midstream Corp CEO?

On March 16, 2026, Heath Deneke received two separate corporation restricted stock unit grants totaling 119,614 units. Each unit is the economic equivalent of one share of common stock and will vest over future service and performance periods, subject to the applicable award agreements.

How many Summit Midstream Corp restricted stock units vested and converted to common stock?

On March 13, 2026, 103,939 corporation restricted stock units vested and were exercised into common stock. These derivative exercises reflect previously granted awards reaching their vesting dates, rather than open-market purchases, and are typical of long-term equity incentive arrangements for senior executives.

Were any Summit Midstream Corp shares sold by the CEO in this Form 4?

No open-market sales were reported. Instead, 40,297 common shares were withheld at a price of $30.29 per share to cover tax liabilities associated with the vesting and settlement of restricted stock units, a standard non-discretionary mechanism for equity awards.

What are DERs mentioned in the Summit Midstream Corp CEO’s Form 4 footnotes?

Distribution equivalent rights (DERs) provide cash payments equal to distributions that would have been paid on the underlying shares during the vesting period. For these corporation restricted stock units, DERs are paid in a lump sum of cash on each vesting date, alongside the equity settlement.

How many Summit Midstream Corp common shares does the CEO hold after these transactions?

After the reported transactions, Heath Deneke directly held 354,350 shares of Summit Midstream Corp common stock. This figure reflects the net position after derivative exercises of restricted stock units and share withholdings to satisfy associated tax obligations on March 13, 2026.