# EDGAR Filing Document

**Accession Number:** 0001555671
**File Stem:** 0002024218-26-000031
**Filing Date:** 2026-3
**Character Count:** 10908
**Document Hash:** 4b1b1d4cd8e92488d45031771e2df602
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0002024218-26-000031.hdr.sgml**: 20260317

**ACCESSION NUMBER**: 0002024218-26-000031

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20260313

**FILED AS OF DATE**: 20260317

**DATE AS OF CHANGE**: 20260317

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Deneke J Heath
- **CENTRAL INDEX KEY:** 0001555671

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-42201
- **FILM NUMBER:** 26764319

**BUSINESS ADDRESS:**
- **BUSINESS PHONE:** 832-519-2203

**MAIL ADDRESS:**
- **STREET 1:** 700 LOUISIANA STREET
- **STREET 2:** SUITE 2550
- **CITY:** HOUSTON
- **STATE:** TX
- **ZIP:** 77002
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Summit Midstream Corp
- **CENTRAL INDEX KEY:** 0002024218
- **STANDARD INDUSTRIAL CLASSIFICATION:** NATURAL GAS TRANSMISSION [4922]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 910 LOUISIANA STREET, SUITE 4200
- **CITY:** HOUSTON
- **STATE:** TX
- **ZIP:** 77002
- **BUSINESS PHONE:** 832-413-4770

**MAIL ADDRESS:**
- **STREET 1:** 910 LOUISIANA STREET, SUITE 4200
- **CITY:** HOUSTON
- **STATE:** TX
- **ZIP:** 77002

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## FORM 4

### STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

[ ] 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**<sup>*</sup><br>Deneke J Heath<br><sub>(Last) (First) (Middle)</sub><br>C/O SUMMIT MIDSTREAM CORPORATION<br>910 LOUISIANA STREET, SUITE 4200<br><sub>(Street)</sub><br>HOUSTON, TX 77002<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2026-03-13 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [ ] 10% Owner<br>[X] Officer (give title below) [ ] Other (specify below)<br>_Chairman, President and CEO_ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>Summit Midstream Corp [ SMC ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | 3. Transaction Code (V) | 3. Transaction Code (V) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | Code | V | Amount | (A) or (D) | Price | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| Common Stock | 2026-03-13 |  | M |  | 58049 | A | <sup>(1)</sup> | 348757 | D |  |
| Common Stock | 2026-03-13 |  | F |  | 22239<sup>(2)</sup> | D | $30.29 | 326518 | D |  |
| Common Stock | 2026-03-13 |  | M |  | 15875 | A | <sup>(1)</sup> | 342393 | D |  |
| Common Stock | 2026-03-13 |  | F |  | 6247<sup>(2)</sup> | D | $30.29 | 336146 | D |  |
| Common Stock | 2026-03-13 |  | M |  | 30015 | A | <sup>(1)</sup> | 366161 | D |  |
| Common Stock | 2026-03-13 |  | F |  | 11811<sup>(2)</sup> | D | $30.29 | 354350 | D |  |

---

## Table II - Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | 4. Transaction Code (V) | 4. Transaction Code (V) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 6. Date Exercisable and Expiration Date | 6. Date Exercisable and Expiration Date | 7. Title and Amount of Underlying Securities | 7. Title and Amount of Underlying Securities | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| Corporation Restricted Stock Units | <sup>(1)</sup> | 2026-03-13 |  | M |  |  | 58049 | <sup>(3)</sup> | <sup>(4)</sup> | Common Stock | 58049 | $0 | 225507 | D |  |
| Corporation Restricted Stock Units | <sup>(1)</sup> | 2026-03-13 |  | M |  |  | 15875 | <sup>(5)</sup> | <sup>(4)</sup> | Common Stock | 15875 | $0 | 209632 | D |  |
| Corporation Restricted Stock Units | <sup>(1)</sup> | 2026-03-13 |  | M |  |  | 30015 | <sup>(6)</sup> | <sup>(4)</sup> | Common Stock | 30015 | $0 | 179617 | D |  |
| Corporation Restricted Stock Units | <sup>(1)</sup> | 2026-03-16 |  | A |  | 59807 |  | <sup>(7)</sup> | <sup>(4)</sup> | Common Stock | 59807 | $0 | 239424 | D |  |
| Corporation Restricted Stock Units | <sup>(1)</sup> | 2026-03-16 |  | A |  | 59807 |  | <sup>(8)</sup> | <sup>(4)</sup> | Common Stock | 59807 | $0 | 297251<sup>(9)</sup> | D |  |

---

### Footnotes:

(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.

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

### Remarks:

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.**