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

Court of Appeals of Texas·Decided October 16, 2025·No. 15-25-00120-CV·Published

Opinion

ACCEPTED 15-25-00120-CV FIFTEENTH COURT OF APPEALS AUSTIN, TEXAS 10/16/2025 11:54 AM No. 15-25-000120-CV CHRISTOPHER A. PRINE CLERK In the Court of Appeals FILED IN 15th COURT OF APPEALS for the Fifteenth District of Texas AUSTIN, TEXAS 10/16/2025 11:54:14 AM CHRISTOPHER A. PRINE Clerk Primexx Energy Opportunity Fund, LP and Primexx Energy Opportunity Fund II, LP, Appellants, v.

Primexx Energy Corporation, et al., Appellees.

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

APPELLANTS’ BRIEF

ORAL ARGUMENT REQUESTED

SUSMAN GODFREY L.L.P.

Stephen Shackelford, Jr. Bryan Caforio State Bar No. 24062998 (TX) bcaforio@susmangodfrey.com sshackelford@susmangodfrey.com Lindsey Godfrey Eccles 1000 Louisiana Street, Ste 5100 leccles@susmangodfrey.com Houston, Texas 77002 Sarah Hannigan Telephone: (713) 651-9366 shannigan@susmangodfrey.com Facsimile: (713) 654-6666

Attorneys for Appellants Table of Contents

STATEMENT OF THE CASE................................................................ 1

STATEMENT REGARDING ORAL ARGUMENT ............................. 2

ISSUES PRESENTED ............................................................................ 2

STATEMENT OF FACTS ...................................................................... 4

I. APPELLANTS ALLEGE THAT BLACKSTONE SOLD PRIMEXX IN BAD FAITH IN VIOLATION OF THE PARTNERSHIP AGREEMENT. ................. 4

II. PLAINTIFFS BEGAN SEEKING RECOURSE IN TEXAS COURTS IN 2022. 7

III. THE BUSINESS COURT GRANTED SUMMARY JUDGMENT AND REJECTED APPELLANTS’ REQUEST TO CONDUCT DISCOVERY AFTER PEC AND BPP EXPRESSLY WAIVED RELIANCE ON ANY FACTS. ........................ 9

THE BUSINESS COURT DISMISSED THE MAJORITY OF IV. DEFENDANTS ON SUA SPONTE MOTIONS TO DISMISS............................. 16

THE BUSINESS COURT GRANTED BLACKSTONE’S AND ANGELO V. ACCONCIA’S SPECIAL APPEARANCES. ..................................................... 17

VI. PLAINTIFFS APPEALED THE FINAL JUDGMENT...................... 19

SUMMARY OF THE ARGUMENT ..................................................... 20

ARGUMENT .......................................................................................... 26

I. EXTENSIVE FACTUAL ISSUES PRECLUDE PRE-DISCOVERY SUMMARY JUDGMENT. ........................................................................... 26

A. Appellees must introduce sufficient facts to establish as a matter of law that they acted according to the “Agreed Duties” of “good faith and fair dealing” when liquidating Primexx to satisfy Blackstone’s ESG priorities. ............................................................. 27

ii B. The Business Court erred in denying Appellants’ request to conduct discovery and granting summary judgment when Appellees waived all reliance on any facts. ...................................... 32

C. The Business Court erred in relying on Texas Beef to find that Appellees necessarily act in good faith when acting pursuant to any other purported contractual right. ............................................ 35

D. The drag-along provision does not modify the § 152.002 “obligation of good faith,” and the contractual “Agreed Duties” of “good faith and fair dealing” create an independent separate duty.38

1. The procedural requirements in the drag-along provision are not standards by which to measure good faith. ..... 39 2. Any modification to the minimum statutory obligation of good faith does not impact the separate and independent contractual “Agreed Duties.” ........................................................ 43

E. Section 152.002 prevents the Partnership Agreement from entirely eliminating the duties of loyalty and care. ......................... 43

AT A MINIMUM, THE PARTNERSHIP AGREEMENT IS II. AMBIGUOUS—WHICH ITSELF PRECLUDES SUMMARY JUDGMENT AND MANDATES REVERSAL. .......................................................................... 46

III. APPELLANTS PROPERLY STATE CLAIMS AGAINST BLACKSTONE, THE BLACKSTONE ENTITIES, AND DOYLE. ........................ 48

A. Blackstone and the Blackstone Entities owe fiduciary duties to Appellants based on their control of PEC and BPP. ......... 50

B. Blackstone and the Blackstone Entities are alter egos of BPP and therefore liable for both breach of fiduciary duty and breach of contract on that basis. ...................................................... 56

C. Appellants state derivative claims against Blackstone and the Blackstone Entities. ............................................................. 62

iii D. Section 13.9 of the Partnership Agreement does not compel dismissal of any claims. ....................................................... 64

ACCONCIA AND BLACKSTONE ARE SUBJECT TO SPECIFIC IV. PERSONAL JURISDICTION IN TEXAS. ....................................................... 67

A. Acconcia, President of BPP and Director on the PEC Board, personally traveled to Texas and continuously directed and solicited Texas residents regarding the Primexx investment and Callon Sale in Texas. ........................................................................ 68

B. Blackstone controlled and managed, and directed the sale of, the Texas oil assets of a Texas partnership to profit. ........... 73

PRAYER FOR RELIEF ........................................................................ 77

iv Index of Authorities

Page(s)

Cases

Allen v. Devon Energy Holdings, L.L.C., 367 S.W.3d 355 (Tex. App.—Houston [1st Dist.] 2012, no pet.) ............................................................................................... 55, 56

American Star Energy and Minerals Corp. v. Stowers, 457 S.W.3d 427 (Tex. 2015) ................................................................ 37

Ballantyne v. Champion Builders, Inc., 144 S.W.3d 417 (Tex. 2004) ................................................................ 36

Belliveau v. Barco, Inc., 987 F.3d 122 (5th Cir. 2021) ............................................................... 62

BMC Software Belgium, N.V. v. Marchand, 83 S.W.3d 789 (Tex. 2002) .................................................................. 68

Bohatch v. Butler & Binion, 977 S.W.2d 543 (Tex. 1998) ................................................................ 45

Burger King Corp. v. Rudzewicz, 471 U.S. 462 (1985) ....................................................................... 71, 75

Carlile Bancshares, Inc. v. Armstrong, No. 02-14-00014-CV, 2014 WL 3891658 (Tex. App.—Fort Worth Aug. 7, 2014, no pet.) ............................................................... 71

Castleberry v. Branscum, 721 S.W.2d 270 (Tex. 1986) ................................................................ 57

CBIF Ltd. P’ship v. TGI Friday’s Inc., No. 05-15-00157-CV, 2017 WL 1455407 (Tex. App.— Dallas Apr. 21, 2017, pet. denied) ................................................ 52, 54

Chien v. Chen, 759 S.W.2d 484 (Tex. App.—Austin 1988, no writ) ........................... 45

v Coleman v. Klockner & Co. AG, 180 S.W.3d 577 (Tex. App.—Houston [14th Dist.] 2005, no pet.) ..................................................................................................... 74

ConocoPhillips Co. v. Koopmann, 547 S.W.3d 858 (Tex. 2018) ................................................................ 47

Cook v. Brundidge, Fountain, Elliott & Churchill, 533 S.W.2d 751 (Tex. 1976) ................................................................ 34

Dalton v.

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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, (Tex. Ct. App. 2025).

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 (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) — published by Counsel Stack Legal Research, free access to 12M+ legal documents.

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