Primexx Energy Opportunity Fund, LP and Primexx Energy Opportunity Fund II, LP v. Primexx Energy Corporation, M. Christopher Doyle, Angelo Acconcia, Blackstone Inc., 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, BX Primexx Topco LLC, and BPP Holdco LLC

Opinion

ACCEPTED 15-25-00120-CV FIFTEENTH COURT OF APPEALS AUSTIN, TEXAS 10/24/2025 3:16 PM No. 15-25-00120-CV CHRISTOPHER A. PRINE CLERK FILED IN IN THE COURT OF APPEALS 15th COURT OF APPEALS AUSTIN, TEXAS FOR THE FIFTEENTH DISTRICT OF TEXAS 10/24/2025 3:16:21 PM CHRISTOPHER A. PRINE Clerk PRIMEXX ENERGY OPPORTUNITY FUND L.P., ET AL., Appellants, V.

PRIMEXX ENERGY CORPORATION, ET AL., Appellees.

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

NOTICE OF APPEARANCE

TO THE HONORABLE FIFTEENTH COURT OF APPEALS:

Please take notice that the following counsel from the law firm of Kirkland

& Ellis, LLP, hereby enter their appearance as counsel of record for Appellee,

Primexx Energy Corporation pursuant to Texas Rules of Appellate Procedure 6.1

and 6.2:

Jeremy A. Fielding, P.C. – Lead Counsel State Bar No. 24040895 jeremy.fielding@kirkland.com Kasdin M. Mitchell, P.C. State Bar No. 24135030 kasdin.mitchell@kirkland.com KIRKLAND & ELLIS LLP 4550 Travis Street Dallas, Texas 75205 Telephone: (214) 972-1770 Facsimile: (214) 972-1771

Zack C. Ewing State Bar No. 24113650 zack.ewing@kirkland.com KIRKLAND & ELLIS LLP 401 W. 4th Street Austin, Texas 78701 Telephone: (512)-678-9050 Facsimile: (512) 678-9101

Appellee respectfully requests that the Court, Clerk and all counsel of record take

notice and direct all future correspondence and other papers filed in this matter to

the counsel identified above.

Respectfully submitted,

By: /s/ Jeremy A. Fielding, P.C. Jeremy A. Fielding, P.C. State Bar No. 24040895 jeremy.fielding@kirkland.com Kasdin M. Mitchell, P.C. State Bar No. 24135030 kasdin.mitchell@kirkland.com KIRKLAND & ELLIS LLP 4550 Travis Street Dallas, Texas 75205 Telephone: (214) 972-1770 Facsimile: (214) 972-1771

2 Zack C. Ewing State Bar No. 24113650 zack.ewing@kirkland.com KIRKLAND & ELLIS LLP 401 W. 4th Street Austin, Texas 78701 Telephone: (512)-678-9050 Facsimile: (512) 678-9101

Attorneys For Appellee, Primexx Energy Corporation

3 CERTIFICATE OF SERVICE I certify that on October 24, 2025, a true and correct copy of the foregoing

was served on all counsel of record through the electronic filing system in

accordance with the Texas Rules of Appellate Procedure.

/s/ Jeremy A. Fielding, P.C. Jeremy A. Fielding, P.C.

4 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.

Gary Vogt on behalf of Jeremy Fielding Bar No. 24040895 gvogt@kirkland.com Envelope ID: 107273935 Filing Code Description: Other Document Filing Description: Notice of Appearance Status as of 10/24/2025 3:28 PM CST

Case Contacts

Name BarNumber Email TimestampSubmitted Status

Roger Cowie 783886 roger.cowie@troutman.com 10/24/2025 3:16:21 PM SENT

Christopher Patton 24083634 cpatton@lynnllp.com 10/24/2025 3:16:21 PM SENT

NATALIE STALLBOHM nstallbohm@lynnllp.com 10/24/2025 3:16:21 PM SENT

SCOTT SMOOT ssmoot@lynnllp.com 10/24/2025 3:16:21 PM SENT

Gary Vogt gvogt@kirkland.com 10/24/2025 3:16:21 PM SENT

Griffin Vail griffin.vail@kirkland.com 10/24/2025 3:16:21 PM SENT

Yaman Desai ydesai@lynnllp.com 10/24/2025 3:16:21 PM SENT

Austin Lesch austin.lesch@kirkland.com 10/24/2025 3:16:21 PM SENT

Michael Patton michael.patton@kirkland.com 10/24/2025 3:16:21 PM SENT

Taylor Levesque Taylor.Levesque@troutman.com 10/24/2025 3:16:21 PM SENT

Louisa Karam Louisa.Karam@troutman.com 10/24/2025 3:16:21 PM SENT

Kasdin Mitchell 24135030 kasdin.mitchell@kirkland.com 10/24/2025 3:16:21 PM SENT

Jeremy Fielding 24040895 jeremy.fielding@kirkland.com 10/24/2025 3:16:21 PM SENT

Zack Ewing zack.ewing@kirkland.com 10/24/2025 3:16:21 PM SENT

Nicholas Perrone nicholas.perrone@kirkland.com 10/24/2025 3:16:21 PM SENT

Stephen Shackelford 24062998 sshackelford@susmangodfrey.com 10/24/2025 3:16:21 PM SENT

Associated Case Party: Primexx Energy Opportunity Fund, LP

Name BarNumber Email TimestampSubmitted Status

Sarah Hannigan shannigan@susmangodfrey.com 10/24/2025 3:16:21 PM SENT

Bryan Caforio bcaforio@susmangodfrey.com 10/24/2025 3:16:21 PM SENT

Michelle Williams mwilliams@susmangodfrey.com 10/24/2025 3:16:21 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.

Gary Vogt on behalf of Jeremy Fielding Bar No. 24040895 gvogt@kirkland.com Envelope ID: 107273935 Filing Code Description: Other Document Filing Description: Notice of Appearance Status as of 10/24/2025 3:28 PM CST

Associated Case Party: Primexx Energy Opportunity Fund, LP

Michelle Williams mwilliams@susmangodfrey.com 10/24/2025 3:16:21 PM SENT

Josephine Wang jwang@susmangodfrey.com 10/24/2025 3:16:21 PM SENT