ACCEPTED 15-25-00095-CV FIFTEENTH COURT OF APPEALS AUSTIN, TEXAS 8/5/2025 2:36 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 8/5/2025 2:36:36 PM CHRISTOPHER A. PRINE Clerk Blackstone 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

NOTICE OF RELATED CASES

Christopher J. Schwegmann Yaman Desai Texas Bar No. 24051315 Texas Bar No. 24101695 [email protected] [email protected] David S. Coale Kyle A. Gardner Texas Bar No. 00787255 Texas State Bar No. 24116412 [email protected] [email protected] Christopher W. Patton Jessica D. Cox Texas Bar No. 24083634 Texas Bar No. 24114769 [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

NOTICE OF RELATED CASE Page 1 of 5 NOW COMES Appellants Blackstone Holdings III LP, Blackstone EMA II LLC, BMAVII LLC, Blackstone 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, BMX Primexx Topco LC (Collectively “Appellants”) hereby certifies as follows.

Appellants certify that this case is related to 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 Manager LLC, BX Primexx Topco LLC and BPP Holdco LLC and Case Number 15-25-00120-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,

NOTICE OF RELATED CASE Page 2 of 5 Blackstone Capital Partners VI LP, BCP VII/BEP II Holdings 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 [email protected] David S. Coale Texas Bar No. 00787255 [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

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 [email protected] Envelope ID: 103998182 Filing Code Description: Other Document Filing Description: 2025-08-05 Notice of Related Case (014 appeal) Status as of 8/5/2025 2:40 PM CST Case Contacts Name BarNumber Email TimestampSubmitted Status Jeremy Fielding 24040895 [email protected] 8/5/2025 2:36:36 PM SENT Christopher Patton 24083634 [email protected] 8/5/2025 2:36:36 PM SENT Roger BCowie [email protected] 8/5/2025 2:36:36 PM SENT Sarah Hannigan [email protected] 8/5/2025 2:36:36 PM SENT Bryan Caforio [email protected] 8/5/2025 2:36:36 PM SENT Michelle Williams [email protected] 8/5/2025 2:36:36 PM SENT Josephine Wang [email protected] 8/5/2025 2:36:36 PM SENT Lindsey Godfrey Eccles [email protected] 8/5/2025 2:36:36 PM SENT Marc M.Seltzer [email protected] 8/5/2025 2:36:36 PM SENT Taylor Levesque [email protected] 8/5/2025 2:36:36 PM SENT Veronica Long [email protected] 8/5/2025 2:36:36 PM SENT Yaman Desai [email protected] 8/5/2025 2:36:36 PM SENT