# EDGAR Filing Document

**Accession Number:** 0001549922
**File Stem:** 0001209191-23-019934
**Filing Date:** 2023-3
**Character Count:** 10873
**Document Hash:** 3513673af9982e68f4bc5a546269b0cf
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001209191-23-019934.hdr.sgml**: 20230317

**ACCESSION NUMBER**: 0001209191-23-019934

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20230315

**FILED AS OF DATE**: 20230317

**DATE AS OF CHANGE**: 20230317

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Sicinski Matthew B.
- **CENTRAL INDEX KEY:** 0001911802

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-35666
- **FILM NUMBER:** 23744679

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

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Summit Midstream Partners, LP
- **CENTRAL INDEX KEY:** 0001549922
- **STANDARD INDUSTRIAL CLASSIFICATION:** NATURAL GAS TRANSMISSION [4922]
- **IRS NUMBER:** 455200503
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 910 LOUISIANA STREET
- **STREET 2:** SUITE 4200
- **CITY:** HOUSTON
- **STATE:** TX
- **ZIP:** 77002
- **BUSINESS PHONE:** 832-413-4770

**MAIL ADDRESS:**
- **STREET 1:** 910 LOUISIANA STREET
- **STREET 2:** SUITE 4200
- **CITY:** HOUSTON
- **STATE:** TX
- **ZIP:** 77002

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Summit Midstream Partners LP
- **DATE OF NAME CHANGE:** 20120514

### 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>Sicinski Matthew B.<br><sub>(Last) (First) (Middle)</sub><br>C/O SUMMIT MIDSTREAM PARTNERS, LP<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>2023-03-15 | **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>_See remarks below._ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>Summit Midstream Partners, LP [ SMLP ] | **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 Units | 2023-03-15 |  | M |  | 2933 | A | <sup>(1)</sup> | 8024<sup>(2)</sup> | D |  |
| Common Units | 2023-03-15 |  | F |  | 715<sup>(3)</sup> | D | $16.00 | 7309 | D |  |
| Common Units | 2023-03-15 |  | M |  | 867 | A | <sup>(1)</sup> | 8176 | D |  |
| Common Units | 2023-03-15 |  | F |  | 212<sup>(3)</sup> | D | $16.00 | 7964 | D |  |
| Common Units | 2023-03-15 |  | M |  | 1747 | A | <sup>(1)</sup> | 9711 | D |  |
| Common Units | 2023-03-15 |  | F |  | 426<sup>(3)</sup> | D | $16.00 | 9285 | 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 |
| Phantom Units | <sup>(1)</sup> | 2023-03-15 |  | A |  | 9524 |  | <sup>(4)</sup> | <sup>(5)</sup> | Common Units | 9524 | $0.00 | 9524 | D |  |
| Phantom Units | <sup>(1)</sup> | 2023-03-15 |  | A |  | 6349 |  | <sup>(6)</sup> | <sup>(5)</sup> | Common Units | 6349 | $0.00 | 6349 | D |  |
| Phantom Units | <sup>(1)</sup> | 2023-03-15 |  | M |  |  | 2933 | <sup>(7)</sup> | <sup>(5)</sup> | Common Units | 2933 | $0.00 | 0<sup>(2)</sup> | D |  |
| Phantom Units | <sup>(1)</sup> | 2023-03-15 |  | M |  |  | 867 | <sup>(8)</sup> | <sup>(5)</sup> | Common Units | 867 | $0.00 | 866 | D |  |
| Phantom Units | <sup>(1)</sup> | 2023-03-15 |  | M |  |  | 1747 | <sup>(9)</sup> | <sup>(5)</sup> | Common Units | 1747 | $0.00 | 3493<sup>(10)</sup> | D |  |

---

### Footnotes:

(1) Each phantom unit is the economic equivalent of one common unit.

(2) On November 9, 2020, the Issuer effected a 1-for-15 reverse unit split (the "Reverse Unit Split"). Pursuant to the Reverse Unit Split, common unitholders received one common unit for every 15 common units owned at the close of business on November 9, 2020. All fractional units created by the Reverse Unit Split were rounded to the nearest whole unit. The common units began trading on a split-adjusted basis on November 10, 2020. After giving effect to the Reverse Unit Split, the number of issued and outstanding common units decreased to 3,774,992.

(3) Common units being withheld to pay tax liability.

(4) One-third of the phantom units (rounded down to the nearest whole number of units, except in the case of the final vesting date) shall vest on each ofthe first, second and third anniversaries of the March 15, 2023 reference date, subject to continued employment and accelerated vesting asprovided in the applicable award agreement. The Reporting Person will receive distribution equivalent rights ("DERs") for each phantom 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 phantom units.

(5) The phantom units and associated DERs do not expire. The phantom units are settled upon vesting in common units (on a one-for-one basis) or in cash, at the discretion of the Issuer.

(6) The phantom units shall vest if and to the extent that the phantom units are earned during the performance period from January 1, 2023 through December 31, 2025, which will depend on whether the performance criteria are achieved as determined by the committee as soon as reasonably practicable, but no later than Friday, March 6, 2026. The vesting of the phantom units is subject to continued employment and accelerated vesting as provided in the applicable award agreement. The Reporting Person will receive DERs for each phantom 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 phantom units.

(7) The final one-third of the phantom units (rounded down to the nearest whole number of units, except in the case of the final vesting date) subject to the original award agreement vested on March 15, 2022, on the third anniversary of the March 15, 2020 reference date. The Reporting Person received DERs for each phantom 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 phantom units.

(8) One-third of the phantom units subject to the original award agreement vested on March 15, 2023, with the final one-third of the phantom unitssubject to vesting on the third anniversary of the March 15, 2021 reference date, subject to continued employment. The Reporting Person received
DERs for each phantom unit, providing for payment on the vesting date of a lump sum of cash equal to the accrued distributions from and after thegrant date of the phantom units.

(9) One-third of the phantom units subject to the original award agreement vested on March 15, 2023, with the remaining phantom units subject tovesting on the second and third anniversaries of the March 15, 2022 reference date, subject to continued employment. The Reporting Personreceived DERs for each phantom unit, providing for payment on the vesting date of a lump sum of cash equal to the accrued distributions from andafter the grant date of the phantom units.

(10) After giving effect to the transactions reported in this Report, the Reporting Person holds an aggregate 32,379 phantom units. This total includes phantom units from other tranches with different vesting dates.

**Remarks:**
The Reporting Person is Senior Vice President, Chief Accounting Officer of Summit Midstream GP, LLC, the general partner of the Issuer (the "General Partner"). The Issuer is managed by the directors and executive officers of the General Partner.

**Signature:** /s/ James D. Johnston, Attorney-in-Fact for Matthew B. Sicinski  
**Date:** 2023-03-17

### 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.**