Blackstone Holdings III LP, Blackstone EMA II LLC, BMA VII LLC, Blackstone Energy Management Associates II LLC, Blackstone Energy Partners II LP, Blackstone Management Associates VII LLC, Blackstone Capital Partners VII LP, BCP VII/BEP II Holdings Manager LLC, and BX Primexx Topco LLC v. Primexx Energy Opportunity Fund, LP and Primexx Energy Opportunity Fund II, LP

ACCEPTED 15-25-00014-CV FIFTEENTH COURT OF APPEALS AUSTIN, TEXAS 6/6/2025 2:30 PM No. 15-25-00014-CV CHRISTOPHER A. PRINE CLERK FILED IN 15th COURT OF APPEALS In the Court of Appeals AUSTIN, TEXAS for the Fifteenth District of Texas 6/6/2025 2:30:57 PM CHRISTOPHER A. PRINE Clerk Blacstone Holdings III LP, et al., Appellants, v. Primexx Energy Opportunity Fund, LP., et al., Appellees.

Appeal from the First Business Court Division Dallas County, Texas Honorable Bill Whitehill, Judge Presiding

FIRST UNOPPOSED MOTION FOR EXTENSION OF TIME TO FILE APPELLANTS’ REPLY BRIEF

David S. Coale Yaman Desai [email protected] [email protected] Christopher J. Schwegmann Kyle A. Gardner [email protected] [email protected] Christopher W. Patton Jessica D. Cox [email protected] [email protected] Lynn Pinker Hurst & Schwegmann LLP 2100 Ross Avenue, Suite 2700 Dallas, Texas 75201 Telephone: (214) 981-3800 Facsimile: (214) 981-3839 Attorneys for Appellants TO THE HONORABLE COURT OF APPEALS: Under Texas Rules of Appellate Procedure 10.5(b)(1) and 38.6(d), Appellants (“Appellants”), file this first unopposed motion for an extension of time and respectfully requests a 9-day extension, or until Friday, June 27, 2025, to file Appellants’ Reply Brief.

I. CURRENT DEADLINE Appellants’ Reply Brief is currently due on Wednesday, June 18, 2025.

II. REASONS FOR EXTENSION Appellants require additional time to review the record, analyze relevant law, and prepare the brief. In addition to preparing Appellants’ brief, counsel for Appellants has been and continues to have responsibilities for additional cases between the present date and the current deadline to submit Appellants’ brief. This extension of time is sought so that justice may be done in the disposition of this case and is not sought for purposes of delay. This is the first extension of the briefing deadline sought by Appellants.

III. REQUEST FOR RELIEF For these reasons, Appellants request that the Court grant this First Unopposed Motion for Extension of Time to File Appellants’ Reply Brief, extending the time to file the brief until June 27, 2025. Appellants further request all additional relief to which they may be justly entitled.

DATE: June 6, 2025 Respectfully submitted, /s/ Jessica D. Cox David S. Coale Texas Bar No. 00787255 [email protected] Christopher J. Schwegmann Texas Bar No. 24051315 [email protected] Christopher W. Patton Texas Bar No. 24083634 [email protected] Yaman Desai Texas Bar No. 24101695 [email protected] Kyle A. Gardner Texas State Bar No. 24116412 [email protected] Jessica D. Cox Texas Bar No. 24114769 [email protected] Lynn Pinker Hurst & Schwegmann LLP 2100 Ross Avenue, Suite 2700 Dallas, Texas 75201 Telephone: (214) 981-3800 Facsimile: (214) 981-3839 Attorneys for Appellants

Certificate of Service The undersigned hereby certifies that a true and correct copy of the above and foregoing document was served on all counsel of record via eFileTexas on June 6, 2025.

/s/ Jessica D. Cox Jessica D. Cox

Certificate of Conference The undersigned certifies that counsel for Appellants conferred with Anne Johnson, counsel for Appellees, on June 5, 2025, and the relief requested by this Motion is not opposed.

/s/ Jessica D. Cox Jessica D. Cox

Automated Certificate of eService This automated certificate of service was created by the efiling system.

The filer served this document via email generated by the efiling system on the date and to the persons listed below. The rules governing certificates of service have not changed. Filers must still provide a certificate of service that complies with all applicable rules.

Jessica Cox on behalf of Jessica Cox Bar No. 24114769 [email protected] Envelope ID: 101727088 Filing Code Description: Motion Filing Description: First Unopposed Motion for Extension of Time to File Appellants' Reply Brief Status as of 6/6/2025 2:44 PM CST Associated Case Party: Blackstone Holdings III LP, et al.

Name BarNumber Email TimestampSubmitted Status David S.Coale [email protected] 6/6/2025 2:30:57 PM SENT Christopher JSchwegmann [email protected] 6/6/2025 2:30:57 PM SENT Christopher W.Patton [email protected] 6/6/2025 2:30:57 PM SENT Kay Ridenour [email protected] 6/6/2025 2:30:57 PM SENT Scott Smoot [email protected] 6/6/2025 2:30:57 PM SENT Yaman Desai [email protected] 6/6/2025 2:30:57 PM SENT Gina Flores [email protected] 6/6/2025 2:30:57 PM SENT Kyle A.Gardner [email protected] 6/6/2025 2:30:57 PM SENT Julie Archuleta [email protected] 6/6/2025 2:30:57 PM SENT Kerri Jones [email protected] 6/6/2025 2:30:57 PM SENT Jessica Cox [email protected] 6/6/2025 2:30:57 PM SENT

Case Contacts Name BarNumber Email TimestampSubmitted Status Theressa Washington [email protected] 6/6/2025 2:30:57 PM SENT

Associated Case Party: Primexx Energy Opportunity Fund, LP., et al.

Name BarNumber Email TimestampSubmitted Status Bryan Caforio [email protected] 6/6/2025 2:30:57 PM SENT Michelle Williams [email protected] 6/6/2025 2:30:57 PM SENT Josephine Wang [email protected] 6/6/2025 2:30:57 PM SENT Automated Certificate of eService This automated certificate of service was created by the efiling system.

The filer served this document via email generated by the efiling system on the date and to the persons listed below. The rules governing certificates of service have not changed. Filers must still provide a certificate of service that complies with all applicable rules.

Jessica Cox on behalf of Jessica Cox Bar No. 24114769 [email protected] Envelope ID: 101727088 Filing Code Description: Motion Filing Description: First Unopposed Motion for Extension of Time to File Appellants' Reply Brief Status as of 6/6/2025 2:44 PM CST Associated Case Party: Primexx Energy Opportunity Fund, LP., et al.

Josephine Wang [email protected] 6/6/2025 2:30:57 PM SENT Stephen Shackelford [email protected] 6/6/2025 2:30:57 PM SENT Sarah Hannigan [email protected] 6/6/2025 2:30:57 PM SENT Lindsey Eccles [email protected] 6/6/2025 2:30:57 PM SENT Jeremy Fielding [email protected] 6/6/2025 2:30:57 PM SENT Zack Ewing [email protected] 6/6/2025 2:30:57 PM SENT Roger Cowie [email protected] 6/6/2025 2:30:57 PM SENT Taylor Levesque [email protected] 6/6/2025 2:30:57 PM SENT Laura Brigham [email protected] 6/6/2025 2:30:57 PM SENT