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

Opinion

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 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 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 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 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 gflores@lynnllp.com 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 jeremy.fielding@kirkland.com 8/5/2025 2:36:36 PM SENT

Christopher Patton 24083634 cpatton@lynnllp.com 8/5/2025 2:36:36 PM SENT

Roger BCowie Roger.Cowie@troutman.com 8/5/2025 2:36:36 PM SENT

Sarah Hannigan shannigan@susmangodfrey.com 8/5/2025 2:36:36 PM SENT

Bryan Caforio bcaforio@susmangodfrey.com 8/5/2025 2:36:36 PM SENT

Michelle Williams mwilliams@susmangodfrey.com 8/5/2025 2:36:36 PM SENT

Josephine Wang jwang@susmangodfrey.com 8/5/2025 2:36:36 PM SENT

Lindsey Godfrey Eccles leccles@susmangodfrey.com 8/5/2025 2:36:36 PM SENT

Marc M.Seltzer mseltzer@susmangodfrey.com 8/5/2025 2:36:36 PM SENT

Taylor Levesque taylor.levesque@troutman.com 8/5/2025 2:36:36 PM SENT

Veronica Long Veronica.Long@troutman.com 8/5/2025 2:36:36 PM SENT

Yaman Desai ydesai@lynnllp.com 8/5/2025 2:36:36 PM SENT