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 4/22/2025 10:43 AM No. 15-25-00014-CV CHRISTOPHER A. PRINE CLERK In the Court of Appeals FILED IN 15th COURT OF APPEALS for the Fifteenth District of Texas AUSTIN, TEXAS 4/22/2025 10:43:57 AM CHRISTOPHER A. PRINE Clerk Blackstone Holdings III LP, et al., Appellants, v. Primexx Energy Opportunity Fund LP, et al., Appellees.

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

FIRST UNOPPOSED MOTION FOR EXTENSION OF TIME TO FILE APPELLEES’ BRIEF

SUSMAN GODFREY L.L.P. Pro hac vice forthcoming: Stephen Shackelford, Jr. Marc M. Seltzer State Bar No. 24062998 (TX) [email protected] [email protected] Bryan Caforio 1000 Louisiana Street, Ste 5100 [email protected] Houston, Texas 77002 Lindsey Godfrey Eccles Telephone: (713) 651-9366 [email protected] Facsimile: (713) 654-6666 Sarah Hannigan [email protected]

Attorneys for Appellees Pursuant to Texas Rules of Appellate Procedure 10.5(b) and 38.6(d), Primexx Energy Opportunity Fund LP and Primexx Energy Opportunity Fund II LP (“Appellees”) file this first unopposed motion for a 30-day extension of time to file Appellees’ Brief, with a new submission date of May 29, 2025.

On March 4, 2025, the Clerk granted Appellants’ unopposed motion for a 30-day extension of time to file Appellants’ Brief. Appellees request a commensurate extension, which Appellants do not oppose. Appellees require additional time given ongoing proceedings in the trial court in this action. This is Appellees’ first request for an extension.

Appellees respectfully request that the Court grant its first unopposed motion for a 30-day extension of time to file Appellees’ Brief, with a new submission date of May 29, 2025.

Dated: April 22, 2025 Respectfully submitted, SUSMAN GODFREY L.L.P. By: /s/ Stephen Shackelford, Jr. Stephen Shackelford, Jr. State Bar No. 24062998 (TX) [email protected]

SUSMAN GODFREY L.L.P. 1000 Louisiana Street, Suite 5100 Houston, Texas 77002 Telephone: (713) 651-9366 Facsimile: (713) 654-6666 Marc M. Seltzer (pro hac vice forthcoming) State Bar No. 54534 (CA) [email protected] Bryan Caforio (pro hac vice forthcoming) State Bar No. 261265 (CA) [email protected] SUSMAN GODFREY L.L.P. 1900 Avenue of the Stars, Suite 1400 Los Angeles, CA 90067 Telephone: (310) 789-3100 Facsimile: (310) 789-3150 Lindsey Godfrey Eccles (pro hac vice forthcoming) State Bar No. 33566 (WA) [email protected] SUSMAN GODFREY L.L.P. Union Street, Suite 3000 Seattle, WA 98101 Telephone: (206) 516-3880 Facsimile: (206) 516-3883 Sarah Hannigan (pro hac vice forthcoming) State Bar No. 5961248 (NY) [email protected] SUSMAN GODFREY L.L.P. One Manhattan West New York, NY 10001 Telephone: (212) 336-8330

Facsimile: (212) 336-8340 Attorneys for Appellees

Certificate of Service This is to certify that on April 22, 2025, a true and correct copy of the above and foregoing instrument was properly forwarded to counsel of record in accordance with Rule 21 of the Texas Rules of Civil Procedure.

/s/ Stephen Shackelford, Jr. Stephen Shackelford, Jr.

Certificate of Conference Counsel for Appellees conferred with counsel for Appellants via e- mail on April 12, 2025 regarding this motion. Appellants do not oppose this motion.

/s/ Stephen Shackelford, Jr. Stephen Shackelford, Jr.

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.

Josephine Wang on behalf of Stephen Shackelford Bar No. 24062998 [email protected] Envelope ID: 99926273 Filing Code Description: Motion Filing Description: Motion for Extension of time to file Appellees' Brief Status as of 4/22/2025 11:14 AM CST Associated Case Party: Blackstone Holdings III LP, et al.

Name BarNumber Email TimestampSubmitted Status David S.Coale [email protected] 4/22/2025 10:43:57 AM SENT Christopher JSchwegmann [email protected] 4/22/2025 10:43:57 AM SENT Christopher W.Patton [email protected] 4/22/2025 10:43:57 AM SENT Kay Ridenour [email protected] 4/22/2025 10:43:57 AM SENT Scott Smoot [email protected] 4/22/2025 10:43:57 AM SENT Kyle A.Gardner [email protected] 4/22/2025 10:43:57 AM SENT Kerri Jones [email protected] 4/22/2025 10:43:57 AM SENT Jessica Cox [email protected] 4/22/2025 10:43:57 AM SENT Yaman Desai [email protected] 4/22/2025 10:43:57 AM SENT Gina Flores [email protected] 4/22/2025 10:43:57 AM SENT Julie Archuleta [email protected] 4/22/2025 10:43:57 AM SENT

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

Name BarNumber Email TimestampSubmitted Status Stephen Shackelford [email protected] 4/22/2025 10:43:57 AM SENT Zack Ewing [email protected] 4/22/2025 10:43:57 AM SENT Roger Cowie [email protected] 4/22/2025 10:43:57 AM SENT Taylor Levesque [email protected] 4/22/2025 10:43:57 AM SENT Laura Brigham [email protected] 4/22/2025 10:43:57 AM SENT Sarah Hannigan [email protected] 4/22/2025 10:43:57 AM SENT Lindsey Eccles [email protected] 4/22/2025 10:43:57 AM SENT Jeremy Fielding [email protected] 4/22/2025 10:43:57 AM 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.

Josephine Wang on behalf of Stephen Shackelford Bar No. 24062998 [email protected] Envelope ID: 99926273 Filing Code Description: Motion Filing Description: Motion for Extension of time to file Appellees' Brief Status as of 4/22/2025 11:14 AM CST Case Contacts Name BarNumber Email TimestampSubmitted Status Theressa Washington [email protected] 4/22/2025 10:43:57 AM SENT Josephine Wang [email protected] 4/22/2025 10:43:57 AM SENT Bryan Caforio [email protected] 4/22/2025 10:43:57 AM SENT Michelle Williams [email protected] 4/22/2025 10:43:57 AM SENT