Summit Midstream (SMC) CFO granted new RSUs and settles prior awards

Rhea-AI Filing Summary

Summit Midstream Corp Executive VP and CFO William J. Mault reported a series of equity compensation moves. On March 16, 2026, he received two awards of 18,071 corporation restricted stock units each, economically equivalent to common stock and accompanied by distribution equivalent rights (DERs). These RSUs include time-based vesting over three years and a separate performance-based tranche tied to results from January 1, 2026 through December 31, 2028.

On March 13, 2026, earlier RSU tranches vested and were settled into common stock via exercises of 16,522, 4,793 and 8,542 units, with a total of 11,751 common shares withheld at $30.29 per share to cover tax liabilities. After these transactions, Mault holds 88,694 shares of common stock directly, along with multiple RSU tranches scheduled to vest over future dates or based on performance outcomes.

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^*

Mault William J.

(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)
	Executive VP and CFO

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		16,522	A	(1)	87,110	D
Common Stock	03/13/2026		F		6,502(2)	D	$30.29	80,608	D
Common Stock	03/13/2026		M		4,793	A	(1)	85,401	D
Common Stock	03/13/2026		F		1,887(2)	D	$30.29	83,514	D
Common Stock	03/13/2026		M		8,542	A	(1)	92,056	D
Common Stock	03/13/2026		F		3,362(2)	D	$30.29	88,694	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			16,522	(3)	(4)	Common Stock	16,522	$0	68,224	D
Corporation Restricted Stock Units	(1)	03/13/2026		M			4,793	(5)	(4)	Common Stock	4,793	$0	63,431	D
Corporation Restricted Stock Units	(1)	03/13/2026		M			8,542	(6)	(4)	Common Stock	8,542	$0	54,889	D
Corporation Restricted Stock Units	(1)	03/16/2026		A		18,071		(7)	(4)	Common Stock	18,071	$0	72,960	D
Corporation Restricted Stock Units	(1)	03/16/2026		A		18,071		(8)	(4)	Common Stock	18,071	$0	90,467(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 William J. Mault	03/17/2026
	** Signature of Reporting Person	Date
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FAQ

What equity awards did Summit Midstream (SMC) CFO William J. Mault receive?

William J. Mault received two grants of 18,071 corporation restricted stock units each on March 16, 2026. These RSUs are economically equivalent to common stock and come with distribution equivalent rights that pay cash equal to accrued distributions on vesting.

How many Summit Midstream (SMC) RSUs vested and were exercised in this Form 4?

On March 13, 2026, RSU tranches of 16,522, 4,793 and 8,542 units vested and were exercised into common stock. Each corporation restricted stock unit converts into one share of common stock or cash, at the issuer’s discretion, upon vesting.

How were tax obligations handled for the Summit Midstream (SMC) CFO’s RSU vesting?

To cover tax liabilities on March 13, 2026 vestings, 6,502, 1,887 and 3,362 common shares were withheld at $30.29 per share. These F-code dispositions are payments of tax obligations, not open-market sales of stock by the executive.

What is the vesting schedule for the new Summit Midstream (SMC) RSU awards?

One RSU tranche vests in three annual installments starting March 16, 2026, subject to continued employment and possible acceleration. A separate performance-based tranche may vest based on criteria measured from January 1, 2026 through December 31, 2028, as determined by the committee.

How many Summit Midstream (SMC) shares does the CFO hold after these transactions?

After the March 13, 2026 RSU vestings, exercises and tax withholdings, William J. Mault directly holds 88,694 shares of Summit Midstream common stock. He also holds additional RSU awards that will vest over time or based on future performance outcomes.

What are distribution equivalent rights (DERs) mentioned in the Summit Midstream (SMC) filing?

Distribution equivalent rights provide cash payments equal to distributions that would have been received on underlying shares. For these RSUs, DERs pay a lump sum of cash on each vesting date equal to accrued distributions from the grant date through vesting.