# EDGAR Filing Document

**Accession Number:** 0002024218
**File Stem:** 0001213900-25-082007
**Filing Date:** 2025-8
**Character Count:** 21486
**Document Hash:** f2e88abf894afc47f27bd17c8fe0d462
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001213900-25-082007.hdr.sgml**: 20250828

**ACCESSION NUMBER**: 0001213900-25-082007

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D/A

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20250828

**DATE AS OF CHANGE**: 20250828

**SUBJECT COMPANY**: 

**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

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-94684
- **FILM NUMBER:** 251275609

**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
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Connect Midstream, LLC
- **CENTRAL INDEX KEY:** 0002045908

**ORGANIZATION NAME:**
- **EIN:** 821957706
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A

**BUSINESS ADDRESS:**
- **STREET 1:** 2021 MCKINNEY AVE, SUITE 1250
- **CITY:** DALLAS
- **STATE:** TX
- **ZIP:** 75201
- **BUSINESS PHONE:** 214-269-8753

**MAIL ADDRESS:**
- **STREET 1:** 2021 MCKINNEY AVE, SUITE 1250
- **CITY:** DALLAS
- **STATE:** TX
- **ZIP:** 75201

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

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**(Amendment No. 1)**

**Summit Midstream Corp**

*(Name of Issuer)*

**Common Stock, par value $0.01 per share**

*(Title of Class of Securities)*

**86614G101**

*(CUSIP Number)*

**Brian Blakeman**<br>c/o Connect Midstream, LLC<br>2021 McKinney Ave, Suite 1250<br>Dallas TX 75201<br>(214) 269-8753

*(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)*

**08/26/2025**

*(Date of Event Which Requires Filing of this Statement)*

| **CUSIP No.** | **86614G101** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Connect Midstream, LLC** | Name of reporting person<br>**Connect Midstream, LLC** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**6644627.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**6644627.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**6644627.00** | Aggregate amount beneficially owned by each reporting person<br>**6644627.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**35.4%** | Percent of class represented by amount in Row (11)<br>**35.4%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

**Comment for Reporting Person:** (1) Row 11 represents (i) 6,524,467 shares of common stock of the Issuer ("Common Stock") issuable in respect of an equivalent number of common units ("Common Units") of the Partnership (as defined below) and class B common stock of the Issuer ("Class B Shares") beneficially owned by the Reporting Persons and (ii) 120,160 shares of Common Stock beneficially owned by the Reporting Persons.

(2) Row 13 is calculated assuming 18,766,331 shares of Common Stock outstanding based upon (i) 12,241,864 Common Stock outstanding as of July 31, 2025, as reported  in the Issuer's Quarterly Report on Form 10-Q filed with the SEC on August 11, 2025, as increased by (ii) 6,524,467 shares of Common Stock issuable in respect of an equivalent number of Common Units and Class B Shares beneficially owned by the Reporting Persons.

| **CUSIP No.** | **86614G101** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Tailwater Energy Fund III LP** | Name of reporting person<br>**Tailwater Energy Fund III LP** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**6644627.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**6644627.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**6644627.00** | Aggregate amount beneficially owned by each reporting person<br>**6644627.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**35.4%** | Percent of class represented by amount in Row (11)<br>**35.4%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**PN** | Type of Reporting Person (See Instructions)<br>**PN** | |

---

**Comment for Reporting Person:** (1) Row 11 represents (i) 6,524,467 shares of Common Stock issuable in respect of an equivalent number of Common Units of the Partnership (as defined below) and Class B Shares beneficially owned by the Reporting Persons and (ii) 120,160 shares of Common Stock beneficially owned by the Reporting Persons.

(2) Row 13 is calculated assuming 18,766,331 shares of Common Stock outstanding based upon (i) 12,241,864 Common Stock outstanding as of July 31, 2025, as reported in the Issuer's Quarterly Report on Form 10-Q filed with the SEC on August 11, 2025, as increased by (ii) 6,524,467 shares of Common Stock issuable in respect of an equivalent number of Common Units and Class B Shares beneficially owned by the Reporting Persons.

| **CUSIP No.** | **86614G101** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Tailwater Capital LLC** | Name of reporting person<br>**Tailwater Capital LLC** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**6644627.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**6644627.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**6644627.00** | Aggregate amount beneficially owned by each reporting person<br>**6644627.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**35.4%** | Percent of class represented by amount in Row (11)<br>**35.4%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

**Comment for Reporting Person:** (1) Row 11 represents (i) 6,524,467 shares of Common Stock issuable in respect of an equivalent number of Common Units of the Partnership (as defined below) and Class B Shares beneficially owned by the Reporting Persons and (ii) 120,160 shares of Common Stock beneficially owned by the Reporting Persons.

(2) Row 13 is calculated assuming 18,766,331 shares of Common Stock outstanding based upon (i) 12,241,864 Common Stock outstanding as of July 31, 2025, as reported  in the Issuer's Quarterly Report on Form 10-Q filed with the SEC on August 11, 2025, as increased by (ii) 6,524,467 shares of Common Stock issuable in respect of an equivalent number of Common Units and Class B Shares beneficially owned by the Reporting Persons.

| **CUSIP No.** | **86614G101** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Jason H. Downie** | Name of reporting person<br>**Jason H. Downie** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**6644627.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**6644627.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**6644627.00** | Aggregate amount beneficially owned by each reporting person<br>**6644627.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**35.4%** | Percent of class represented by amount in Row (11)<br>**35.4%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

**Comment for Reporting Person:** (1) Row 11 represents (i) 6,524,467 shares of Common Stock issuable in respect of an equivalent number of Common Units of the Partnership (as defined below) and Class B Shares beneficially owned by the Reporting Persons and (ii) 120,160 shares of Common Stock beneficially owned by the Reporting Persons.

(2) Row 13 is calculated assuming 18,766,331 shares of Common Stock outstanding based upon (i) 12,241,864 Common Stock outstanding as of July 31, 2025, as reported  in the Issuer's Quarterly Report on Form 10-Q filed with the SEC on August 11, 2025, as increased by (ii) 6,524,467 shares of Common Stock issuable in respect of an equivalent number of Common Units and Class B Shares beneficially owned by the Reporting Persons.

| **CUSIP No.** | **86614G101** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Edward Herring** | Name of reporting person<br>**Edward Herring** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**6644627.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**6644627.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**6644627.00** | Aggregate amount beneficially owned by each reporting person<br>**6644627.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**35.4%** | Percent of class represented by amount in Row (11)<br>**35.4%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

**Comment for Reporting Person:** (1) Row 11 represents (i) 6,524,467 shares of Common Stock issuable in respect of an equivalent number of Common Units of the Partnership (as defined below) and Class B Shares beneficially owned by the Reporting Persons and (ii) 120,160 shares of Common Stock beneficially owned by the Reporting Persons.

(2) Row 13 is calculated assuming 18,766,331 shares of Common Stock outstanding based upon (i) 12,241,864 Common Stock outstanding as of July 31, 2025, as reported  in the Issuer's Quarterly Report on Form 10-Q filed with the SEC on August 11, 2025, as increased by (ii) 6,524,467 shares of Common Stock issuable in respect of an equivalent number of Common Units and Class B Shares beneficially owned by the Reporting Persons.

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Common Stock, par value $0.01 per share

**(b) Name of Issuer:**
Summit Midstream Corp

**(c) Address of Issuer's Principal Executive Offices:**
901 Louisiana Street, Suite 4200, Houston, TX, 77002

This Amendment No. 1 to Schedule 13D ("Amendment No. 1") amends the Statement on Schedule 13D (as amended, the "Schedule 13D") initially filed on December 3, 2024 with the Securities and Exchange Commission and relates to the Common Stock of Summit Midstream Corporation (the "Issuer").

**Item 5. Interest in Securities of the Issuer**

**(a)**
The information set forth in rows eleven and thirteen on the cover pages of this Amendment No. 1 is incorporated by reference into this Item 5(a).

The reported securities represent (i) 6,524,467 shares of Common Stock issuable in respect of an equivalent number of Common Units and Class B Shares beneficially owned by the Reporting Persons and (ii) 120,160 shares of Common Stock directly held by Connect Midstream, which represents 35.4% of the shares of Common Stock outstanding as of the date hereof. Such percentage is calculated assuming 18,766,331 shares of Common Stock outstanding based upon (i) 12,241,864 Common Stock outstanding as of July 31, 2025, as reported in the Issuer's Quarterly Report on Form 10-Q filed with the SEC on August 11, 2025, as increased by (ii) 6,524,467 shares of Common Stock issuable in respect of an equivalent number of Common Units and Class B Shares beneficially owned by the Reporting Persons.

In this regard, Connect Midstream is the direct holder of (i) 6,524,467 Common Units which are convertible into an equivalent number of shares of Common Stock and the direct holder of (ii) 120,160 shares of Common Stock. Connect Midstream is also the direct holder of 6,524,467 Class B Shares, which do not represent an economic interest in the Issuer but provide holders of Common Units with voting rights. Upon conversion of Common Units into shares of Common Stock, an equivalent number of Class B Shares are forfeited for no consideration. Tailwater Energy is the sole member of Connect Midstream. TW GP EF-III LP is the general partner of Tailwater Energy. TW GP EF-III GP, LLC is the general partner of TW GP EF-III LP. Tailwater Capital LLC is the sole member of TW GP EF-III GP, LLC. Jason H. Downie and Edward Herring are both Managing Partners of Tailwater Capital. As a result of these relationships, each of the foregoing may be deemed to beneficially own the reported securities, provided that neither the filing of this Schedule 13D nor any of its contents shall be deemed to constitute an admission by any of the Reporting Persons or any of the foregoing that it is the beneficial owner of any of the Common Stock referred to herein for the purposes of Section 13(d) of the Act, or for any other purpose.

**(b)**
The information set forth in rows seven through ten on the cover pages of this Amendment No. 1 and the information set forth in Item 5(a) of this Amendment No. 1 are each incorporated by reference into this Item 5(b).

**(c)**
Connect Midstream purchased shares of Common Stock on the public market within the prior 60 days as follows:

Date           Purchase/(Sale)     Amount of Shares     Average Price     Low Price     High Price

8/26/25      Purchase                72,759                        $20.46                 $19.87           $20.87
8/27/25      Purchase                47,401                        $20.50                 $20.35           $20.82

The Reporting Persons undertake to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, full information regarding the number of shares purchased or sold at each separate price within the ranges set forth above.

Except for the foregoing or as otherwise set forth herein, each of the Reporting Persons reports that neither it, nor to its knowledge, any other person named in Item 2 of the Schedule 13D, has effected any transactions in Common Stock during the past 60 days.

### SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Connect Midstream, LLC

**Signature:** /s/ Jason H. Downie

**Name/Title:** Jason H. Downie/Director

**Date:** 08/28/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Tailwater Energy Fund III LP

**Signature:** /s/ Jason H. Downie

**Name/Title:** Jason H. Downie/Managing Partner

**Date:** 08/28/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Tailwater Capital LLC

**Signature:** /s/ Jason H. Downie

**Name/Title:** Jason H. Downie/Managing Partner

**Date:** 08/28/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Jason H. Downie

**Signature:** /s/ Jason H. Downie

**Name/Title:** Jason H. Downie

**Date:** 08/28/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Edward Herring

**Signature:** /s/ Edward Herring

**Name/Title:** Edward Herring

**Date:** 08/28/2025