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 15-25-00095-CV FIFTEENTH COURT OF APPEALS AUSTIN, TEXAS 8/5/2025 3:34 PM No. 15-25-00120-CV CHRISTOPHER A. PRINE CLERK FILED IN 15th COURT OF APPEALS In the Court of Appeals AUSTIN, TEXAS for the Fifteenth District of Texas 8/5/2025 3:34:01 PM CHRISTOPHER A. PRINE Clerk

Primexx Energy Opportunity Fund, LP, et al., Appellants, v. Primexx Energy Corporation., et al., Appellees.

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

NOTICE OF RELATED CASES

Christopher J. Schwegmann Yaman Desai Texas Bar No. 24051315 Texas Bar No. 24101695 schwegmann@lynnllp.com ydesai@lynnllp.com David S. Coale Kyle A. Gardner Texas Bar No. 00787255 Texas State Bar No. 24116412 dcoale@lynnllp.com kgardner@lynnllp.com Christopher W. Patton Jessica D. Cox Texas Bar No. 24083634 Texas Bar No. 24114769 cpatton@lynnllp.com jcox@lynnllp.com Lynn Pinker Hurst & Schwegmann LLP 2100 Ross Avenue, Suite 2700 Dallas, Texas 75201 Telephone: (214) 981-3800 Facsimile: (214) 981-3839

NOTICE OF RELATED CASE Page 1 of 5 NOW COMES Appellees Blackstone EMA II LLC, Blackstone Holdings

III LP, Angelo Acconcia, BPP Holdco LLC, Blackstone Management

Associates VIII LLC, Blackstone, Inc., Blackstone Energy Partners II LP,

Blackstone Energy Management Associates II LLC, BCP VII/BEP II

Holdings Manager LLC, BX Primexx Topco LLC, BMA VII LLC, and

Blackstone Capital Partners VII LP (collectively “Appellees”) hereby certifies

as follows.

Appellees certify that this case is related to Case Number 15-25-00014-

CV, 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 VI 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 and Case Number 15-25-00095-CV,

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

NOTICE OF RELATED CASE Page 2 of 5 Manager LLC, BX Primexx Topco LLC and BPP Holdco LLC. Each of these

cases arise from Case Number 24-BC01A-0010, Primex 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. These cases each arise from the

same central controversy and involve the parties to Case Number 24-BC01A-

0010.

NOTICE OF RELATED CASE Page 3 of 5 DATE: August 5, 2025 Respectfully submitted,

/s/ Kyle Gardner Christopher J. Schwegmann Texas Bar No. 24051315 cschwegmann@lynnllp.com David S. Coale Texas Bar No. 00787255 dcoale@lynnllp.com Christopher W. Patton Texas Bar No. 24083634 cpatton@lynnllp.com Yaman Desai Texas Bar No. 24101695 ydesai@lynnllp.com Kyle A. Gardner Texas State Bar No. 24116412 kgardner@lynnllp.com Jessica D. Cox Texas Bar No. 24114769 jcox@lynnllp.com Lynn Pinker Hurst & Schwegmann LLP 2100 Ross Avenue, Suite 2700 Dallas, Texas 75201 Telephone: (214) 981-3800 Facsimile: (214) 981-3839

Attorneys for Appellees

NOTICE OF RELATED CASE Page 4 of 5 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 eFile Texas on August 5, 2025. /s/ Kyle Gardner Kyle A. Gardner

NOTICE OF RELATED CASE Page 5 of 5 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.

Gina Flores on behalf of Kyle Gardner Bar No. 24116412 gflores@lynnllp.com Envelope ID: 104003789 Filing Code Description: Other Document Filing Description: 2025-08-05 Notice of Related Case (120 appeal) Status as of 8/5/2025 3:37 PM CST

Case Contacts

Name BarNumber Email TimestampSubmitted Status

Jeremy Fielding 24040895 jeremy.fielding@kirkland.com 8/5/2025 3:34:01 PM SENT

Christopher Patton 24083634 cpatton@lynnllp.com 8/5/2025 3:34:01 PM SENT

Roger BCowie Roger.Cowie@troutman.com 8/5/2025 3:34:01 PM SENT

Sarah Hannigan shannigan@susmangodfrey.com 8/5/2025 3:34:01 PM SENT

Bryan Caforio bcaforio@susmangodfrey.com 8/5/2025 3:34:01 PM SENT

Michelle Williams mwilliams@susmangodfrey.com 8/5/2025 3:34:01 PM SENT

Josephine Wang jwang@susmangodfrey.com 8/5/2025 3:34:01 PM SENT

Lindsey Godfrey Eccles leccles@susmangodfrey.com 8/5/2025 3:34:01 PM SENT

Marc M.Seltzer mseltzer@susmangodfrey.com 8/5/2025 3:34:01 PM SENT

Taylor Levesque taylor.levesque@troutman.com 8/5/2025 3:34:01 PM SENT

Veronica Long Veronica.Long@troutman.com 8/5/2025 3:34:01 PM SENT

Yaman Desai ydesai@lynnllp.com 8/5/2025 3:34:01 PM SENT