William J. Mault - 13 Mar 2026 Form 4 Insider Report for Summit Midstream Corp (SMC)

Role
Executive VP and CFO
Signature
/s/ James D. Johnston, Attorney-in-Fact for William J. Mault
Issuer symbol
SMC
Transactions as of
13 Mar 2026
Net transactions value
$0
Form type
4
Filing time
17 Mar 2026, 19:47:33 UTC
Previous filing
21 Jan 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Mault William J. Executive VP and CFO C/O SUMMIT MIDSTREAM CORPORATION, 910 LOUISIANA STREET, SUITE 4200, HOUSTON /s/ James D. Johnston, Attorney-in-Fact for William J. Mault 17 Mar 2026 0001911803

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction SMC Common Stock Options Exercise +16,522 +23% 87,110 13 Mar 2026 Direct F1
transaction SMC Common Stock Tax liability -6,502 -7.5% $30.29* 80,608 13 Mar 2026 Direct F2
transaction SMC Common Stock Options Exercise +4,793 +5.9% 85,401 13 Mar 2026 Direct F1
transaction SMC Common Stock Tax liability -1,887 -2.2% $30.29* 83,514 13 Mar 2026 Direct F2
transaction SMC Common Stock Options Exercise +8,542 +10% 92,056 13 Mar 2026 Direct F1
transaction SMC Common Stock Tax liability -3,362 -3.7% $30.29* 88,694 13 Mar 2026 Direct F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction SMC Corporation Restricted Stock Units Options Exercise -16,522 -19% $0.000000* 68,224 13 Mar 2026 Common Stock 16,522 Direct F1, F3, F4
transaction SMC Corporation Restricted Stock Units Options Exercise -4,793 -7% $0.000000* 63,431 13 Mar 2026 Common Stock 4,793 Direct F1, F4, F5
transaction SMC Corporation Restricted Stock Units Options Exercise -8,542 -13% $0.000000* 54,889 13 Mar 2026 Common Stock 8,542 Direct F1, F4, F6
transaction SMC Corporation Restricted Stock Units Award +18,071 +33% $0.000000* 72,960 16 Mar 2026 Common Stock 18,071 Direct F1, F4, F7
transaction SMC Corporation Restricted Stock Units Award +18,071 +25% $0.000000* 90,467 16 Mar 2026 Common Stock 18,071 Direct F1, F4, F8, F9
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Each corporation restricted stock unit is the economic equivalent of one common stock.
F2 Common stocks being withheld to pay tax liability.
F3 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.
F4 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.
F5 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.
F6 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.
F7 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.
F8 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.
F9 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.