Chapter 11 ) ECHO ENERGY PARTNERS I, LLC ) Case No

Case 20-31920 Document 376 Filed in TXSB on 11/04/20 Page 1 of 10

IN THE UNITED STATES BANKRUPTCY COURT FOR THE SOUTHERN DISTRICT OF TEXAS

In re: ) Chapter 11 ) ECHO ENERGY PARTNERS I, LLC ) Case No. 20-31920 (DRJ) ) Debtor. )

CERTIFICATE OF SERVICE

I, Julian A. Del Toro, depose and say that I am employed by Stretto, the claims and noticing agent for the Debtors in the above-captioned cases.

On October 16, 2020 at my direction and under my supervision, employees of Stretto caused the following document to be served via first-class mail on the service list attached hereto as Exhibit A , and via electronic mail on the service list attached hereto as Exhibit B:

• Notice of Occurrence of Effective Date of Chapter 11 Plan of Liquidation and Deadlines for Filing Claims for Rejection Damages, Administrative Expenses and Application for Professional Fees (Docket No. 366)

Dated: November 4, 2020 /s/ Julian A. Del Toro Julian A. Del Toro STRETTO 410 Exchange, Suite 100 Irvine, CA 92602 Telephone: 855-422-8458 Email:[email protected] Case 20-31920 Document 376 Filed in TXSB on 11/04/20 Page 2 of 10

Exhibit A

Case 20-31920 Document 376 Filed in TXSB on 11/04/20 Page 3 of 10

Exhibit A Served Via First-Class Mail

Name Attention Address 1 Address 2 City State Zip 89 Energy LLC 123 NW 8th St Oklahoma City OK 73102-5804 c/o Foley Gardere, Foley & Lardner Attn: Stephen A. McCartin and Melina 2021 McKinney Avenue, Suite Acacia Energy Partners, LLC LLP Bales 1600 Dallas TX 75201 Acacia Exploration Partners, LLC Attn: Stephen McCartin 2021 McKinney Avenue, Suite 1600 Dallas TX 75201 14001 Dallas Parkway, Suite Acacia Exploration Partners, LLC c/o Acacia Energy Attn: Clayton Flurry 1200 Dallas TX 75240 Alta Mesa Services LP Janie Daniel 4119 Montrose Blvd Ste 230 Houston TX 77006-4964 Alta Mesa Services, LP c/o BCE-Mach III, LLC Attn: THE CORPORATION COMPANY 1833 SOUTH MORGAN ROAD OKLAHOMA CITY OK 73128 Alta Mesa Services, LP c/o Tribolet Advisors LLC Michael A. Tribolet 2305A Elmen Street Houston TX 77019 Apache Corporation PO Box 840094 Dallas TX 75284-0094 Apache Corporation Jay Buckley 2000 Post Oak Boulevard Suite 100 Houston TX 77056 ARP Operating LLC 119 North Robinson Suite 400 Oklahoma City OK 73102 Avalon Operating LLC 15 W. 6th Street Suite 2300 Tulsa OK 74119-0000 Basin Operating Services 1117 NW 24th St Oklahoma City OK 73106 Basis Resources Group, LLC 4334 NW Expressway Ste 201 Oklahoma City OK 73116-1516 Bayou City Energy Total Plaza, 1201 Louisiana St Houston TX 77002 BCE-Mach III, LLC The Corporation Company 1833 S Morgan RD Oklahoma City OK 73128 Beck Resources Inc. PO Box 175 Hennessey OK 73742-0175 Black Mesa Production LLC 401 S. Boston Ave. Suite 450 Tulsa OK 74103 Blake Production Company Inc. 1601 NW Expressway Suite 77 Oklahoma City OK 73118-1446 BP America Production Company c/o Liskow & Lewis Attn: Michael D. Rubenstein 1001 Fannin Street, Suite 1800 Houston TX 77002 BP America Production Company Wender Moreno PO Box 848155 Dallas TX 75284 BP Energy Company 201 Helios Way Houston TX 77079-0000 Bracewell LLP 711 Louisiana Street Suite 2300 Houston TX 77002 Brandon O'Gara 3817 NW Expressway Suite 840 Oklahoma City OK 73112-1400 Bureau of Indian Affairs 1635 East Hwy 66 El Reno OK 73036 Bureau of Indian Affairs 1849 C Street, N.W. Washington DC 20240 Bureau of Land Management 201 Stephenson Parkway Suite 1200 Norman OK 73072 Camino Natural Resources LLC Mark Brown 1401 17th Street Suite 1000 Denver CO 80202 Camino Natural Resources, LLC c/o Davis Graham & Stubbs LLP Attn: Kyler Burgi 1550 17th Street, Suite 500 Denver CO 80202 Cargill Incorporated 9350 Excelsior Boulevard Hopkins MN 55343-9497 Carl L. Maloy 3716 South Winston Tulsa OK 74135 Carrera Energy LLC 901 W. Missouri Avenue Midland TX 79701-0000 Carrera Energy LLC P.O. Box 5036 Midland TX 79704 Cartesian Equity Management, LLC c/o The Corporation Trust Company Corporation Trust Center 1209 Orange Street Wilmington DE 19801 Cartesian Equity Management, LLC and Echo Energy, LLC c/o Philips Murrah P.C. Attn: Dawn M. Rahme 101 N. Robinson, 13th Fl Oklahoma City OK 73102 Casillas Operating LLC Zach Malchi PO Box 3668 Tulsa OK 74101 Castell Oil Company LLC 123 NW 8th Street Oklahoma City OK 73102 Chaparral Energy LLC Justin P. Byrne, General Counsel 701 Cedar Lake Boulevard Oklahoma City OK 73114 Chesapeake Energy Corporation Michael Lovelace P.O. Box 207295 Dallas TX 75320-7295 Cheyenne & Arapaho Tribes Tax Commission Oil & Gas Division 100 Redmoon Circle PO Box 68 Concho OK 73022 Cheyenne Petroleum Co 11714 PINE FOREST DRIVE Dallas TX 75230-2833 Christian Kanady 3817 NW Expressway Suite 840 Oklahoma City OK 73112-1400 Cimarex Energy Company Kevin Smith 4023 Solutions Center #774023 Chicago IL 60677 Citation Oil & Gas Corporation c/o Crowe & Dunlevy, PC Attn: Tim J. Gallegly 324 N. Robinson Ave., Ste. 100 Oklahoma City OK 73102 Citation Oil and Gas Corp Matthew Thompson 14077 Cutten Road Houston TX 77069 Citizen Energy II LLC 320 S Boston Ave Suite 1300 Tulsa OK 74103

In re: Echo Energy Partners I, LLC Case No. 20-31920 (DRJ) Page 1 of 5 Case 20-31920 Document 376 Filed in TXSB on 11/04/20 Page 4 of 10

Exhibit A Served Via First-Class Mail

Name Attention Address 1 Address 2 City State Zip Citizen Energy III LLC Curtis Johnson 320 S Boston Ave Ste 900 Tulsa OK 74103 Collins Permian, LP PO BOX 27 Midland TX 79702 Comanche Exploration Company 6520 N. Western Avenue Suite 300 Oklahoma City OK 73116 Commissioners Of The Land Office 204 N Robinson Suite 900 Oklahoma City OK 73102 CONTINENTAL RESOURCES INC. PO BOX 268835 OKLAHOMA CITY OK 731260000 Continental Resources Inc. Brooks Richardson PO Box 952724 St. Louis MO 63195 Attn Sidney K. Swinson & Brandon C. 1100 ONEOK Plaza 100 West Continental Resources, Inc c/o GableGotwals Bickle Fifth Street Tulsa OK 74103-4217 COR Operating LLC 6120 S. Yale Avenue Suite 1200 Tulsa OK 74136 Council Oak Resources 6120 S Yale Ave Ste 1200 Tulsa OK 74136 CT Corporation PO Box 4349 Carol Stream IL 60197-4349 CWC Holdings LLC PMB 414 3824 Cedar Springs Rd Dallas TX 75219-4136 CWC Holdings, LLC c/o Legal Dept. Two Lincoln Centre 5420 LBJ Freeway, Suite 750 Dallas TX 75240 Delaware Department of Justice Carvel State Office Building 820 N French Street Wilmington DE 19801 Delaware Secretary Of State 401 Federal Street Suite 4 Dover DE 19901 Department of Environmental Air Quality Division PO Box 2036 Oklahoma City OK 731012036 Dept of Environmntl Air Quality Div PO Box 1677 Oklahoma City OK 73101 Devon Energy Production Company LP Amy Carpenter PO Box 842485 Dallas TX 75284 Eagle Exploration Production LLC 2488 E 81St Ste 2000 Tulsa OK 74137-4224 ECHO E&P LLC 120 ROBERT S KERR AVE STE 701 OKLAHOMA CITY OK 73102-6439 Echo E&P LLC 120 Robert S Kerr Ave Ste 701 Oklahoma City OK 73102-6439 Echo E&P, LLC and Echo Energy, LLC Tanner W. Hicks 120 Robert S. Kerr Avenue, Suite 701 Oklahoma City OK 73102 Echo Energy, LLC 120 Robert S Kerr Ave Ste C7 Oklahoma City OK 73102-6439 Echo Investment Partners, LLC Attn: Christian Kanady 120 Robert S Kerr Ave #701 Oklahoma City OK 73102-6439 Echo Minerals LP 120 Robert S Kerr Ave #701 Oklahoma City OK 73102-6439 Echo Minerals Ac LLC 120 Robert S Kerr Ave Ste C7 Oklahoma City OK 73102-6439 Echo Minerals Ac III LLC 120 Robert S Kerr Ave Ste C7 Oklahoma City OK 73102-6439 Echo Minerals I LLC 120 Robert S Kerr Ave Ste C7 Oklahoma City OK 73102-6439 Echo Operating, LLC The Corporation Company 1833 S Morgan Rd Oklahoma City OK 73128 Echo Warwick Minerals LLC 120 Robert S Kerr Ave Ste C7 Oklahoma City OK 73102-6439 Enable Gathering & Processing LLC Andy Bush PO Box Dept 96-0387 Oklahoma City OK 73196 Enable Midstream Partners, LP and Enable Gas Gathering & Processing, LLC c/o HAYNES AND BOONE, LLP Attn Arsalan Muhammad & David Trausch 1221 McKinney, Suite 2100 Houston TX 77010 Encana Oil & Gas Inc 730 17th Street Ste 1700 Denver CO 80202 EOG Resources Inc. Dax Taylor 14701 Hertz Quail Springs Pkwy Oklahoma City OK 73134-2646 Evercore Group LLC 55 East 52nd Street New York NY 10055 Excalibur Resources LLC 1100 Louisiana St Suite 5100 Houston TX 77002-5220 Forrest "Butch" Freeman, Oklahoma County Treasurer 320 Robert S. Kerr RM 307 Oklahoma City OK 73102 Gaedeke Oil & Gas Operating L.L.C. Brenda Loftis 3710 Rawlins Street Suite 1100 Dallas TX 75219 Glenn Resources Corp 15218 King of Spain Court Dallas TX 75248 Gulfport Midcon LLC Rebecca Addison P.O. Box 1945 Memphis TN 38101 Hall Estill Hardwick Gable 320 S Boston Avenue Suite 200 Tulsa OK 74103 Harris County PO Box 3547 Houston TX 77253-3547 HighPoint Energy LLC 6800 W Loop S # 120 Bellaire TX 77401 HighPointe Energy LLC PMB 171 13919 N May Ave Ste B Oklahoma City OK 73134-5004 Hogan Taylor LLP PO Box 1481 Lowell AR 72745-0000

In re: Echo Energy Partners I, LLC Case No. 20-31920 (DRJ) Page 2 of 5 Case 20-31920 Document 376 Filed in TXSB on 11/04/20 Page 5 of 10

Exhibit A Served Via First-Class Mail

Name Attention Address 1 Address 2 City State Zip Internal Revenue Service PO Box 7346 Philadelphia PA 19101-7346 Internal Revenue Service 1111 Constitution Avenue NW Washington DC 20224 Matthew D. Cavenaugh, Elizabeth C. Jackson Walker LLP Freeman, and Victoria Argeroplos 1401 McKinney St, Ste 1900 Houston TX 77010 James Petroleum Trust dated 2/2/1974 Bradley E. Davenport 210 Park Avenue Suite 1200 Oklahoma City OK 73102-5603 Jeffries LLC 520 Madison Avenue New York NY 10022 John T Young, Jr 2216 Chilton Road Houston TX 77019 Jones Energy LLC Scott Van Sickle 14301 Caliber Dr Ste 110 Oklahoma City OK 73134-1016 Joshua Hood 3817 NW Expressway Suite 840 Oklahoma City OK 73112-1400 K S Oil Company Inc. 3100 S Berry Road Suite 210 Norman OK 73072 Attn Michael J. Durrschmidt & Brian A. K S OIL COMPANY, INC. c/o Hirsch & Westheimer Buescher 1415 Louisiana, Floor 36 Houston TX 77002 c/o Luanne M. Walker, Managing Keith F. Walker Oil & Gas Company Member P.O. Box 1725 Ardmore OK 73402 Keith F. Walker Oil & Gas Company LLC 710 Cedar Lake Blvd Ste 102 Oklahoma City OK 73114-7811 Kirby Minerals PO Box 268947 Oklahoma City OK 73126-8947 Kirby Minerals, an OK general partnership 101 N. ROBINSON AVE., SUITE 1000 OKLAHOMA CITY OK 73102 Kirkland & Ellis LLP 300 N Lasalle Drive Chicago Il IL 60654 Kirkland & Ellis LLP and Kirkland & Ellis International LLP Anna G. Rotman and Jamie A. Aycock 609 Main St Houston TX 77002 Kirkland & Ellis LLP and Kirkland & Ellis International LLP Joshua A. Sussberg 601 Lexington Ave New York NY 10022 Kirkpatrick Oil Company Inc. 1001 West Wilshire Boulevard Oklahoma City OK 73116 Leslie J. Arnold 28176 Portland Ave Blanchard OK 73010-7152 Lime Rock Resources Operating Company Melissa Bell 1111 Bagby Street Suite 4600 Houston TX 77002 Linn Operating Inc. P.O. Box 671631 Dallas TX 75267-1631 Mack Energy Co. 1202 N 10th Street Duncan OK 73534 MAP2004-OK, an OK general partnership 101 N. ROBINSON AVE., SUITE 1000 OKLAHOMA CITY OK 73102 Map2009 OK PO Box 248833 Oklahoma City OK 73124-8833 MAP2009-OK, an OK general partnership 101 N. ROBINSON AVE., SUITE 1000 OKLAHOMA CITY OK 73102 c/o Bonds Ellis Eppich Schafer Jones Attn: Clay M. Taylor and J. Robertson 420 Throckmorton Street, Suite Marathon Oil Company LLP Clarke 1000 Fort Worth TX 76102 Marathon Oil Company Todd Richards PO Box 732309 Dallas TX 75373 Mewbourne Oil Company P.O. Box 7698 Tyler TX 75711 Midfirst Bank 5800 N. Western Avenue Oklahoma City OK 73118-0000 Minri LLC 171 Pier Ave 359 Santa Monica CA 90405-0000 N.V. Shires PO Box 5998 Norman OK 73070 N.V. Shires and Roger Beavers Scott R. Farris 6500 N. Grand Blvd. #172 Oklahoma City OK 73116 N.V. Shires and Roger L. Beavers PO BOX 5998 Norman OK 73070 Native Exploration Operating P.O. BOX 18108 Oklahoma City OK 73154 Newfield Exploration MI PO Box 204374 Dallas TX 75320-4374 Hector Duran, Jr & Stephen Douglas Office of the United States Trustee Statham 515 Rusk Street, Suite 3516 Houston TX 77002 Oklahoma Corporation Commission PO Box 52000 Oklahoma City OK 73152-2000 Oklahoma County Treasurer PO Box 268875 Oklahoma City OK 73126 Oklahoma Independent Petroleum Assc 500 N E 4th Street Oklahoma City OK 73104 Oklahoma Office of the Attorney General 313 NE 21st St Oklahoma City OK 73105 Oklahoma Tax Commission PO Box 26860 Oklahoma City OK 731260860

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Exhibit A Served Via First-Class Mail

Name Attention Address 1 Address 2 City State Zip Oklahoma Tax Commission PO Box 26940 Oklahoma City OK 73126-0940 Opportune 711 Louisiana Street Suite 3100 Houston TX 77002-0000 Ovintiv Mid Continent Inc. Sarah Robertson 370 17th Street Suite 1700 Denver CO 80202 Ovintiv Mid Continent, Inc. c/o DAVIS GRAHAM & STUBBS LLP Attn Kyler K. Burgi 1550 17th Street, Suite 500 Denver CO 80202 Ovintiv Mid Continent, Inc. c/o Davis Graham & Stubbs LLP Attn: Kyler Burgi 1550 17th Street, Suite 500 Denver CO 80202 Ovintiv Mid Continent, Inc. Ovintiv Exploration Inc. PO Box 660367 Mail Code 5241 Dallas TX 75266-0367 Paloma Partners IV LLC Lynn Graves 1100 Louisiana Street Suite 5100 Houston TX 77002 Petroleum Strategies I 303 W Wall Street Suite 2400 Midland TX 79701 Phoenix Petrocorp Inc. 1201 S. Stonebridge Drive Unite 1201 Mckinney TX 75070-0000 Phoenix Petrocorp Inc. 15400 Lookout Point Cirlce Frisco TX 75035 1221 McKinney Street Suite Pivotal Petroleum Partners II LP c/o Haynes and Boone, LLP Attn: Patrick L. Hughes & David Trausch 4000 Houston TX 77010 Pride Energy Company 4641 E. 91st St Tulsa OK 74137 Pride Energy Company 4641 E. 91st St. Tulsa OK 74137 Pride Energy Company Attn: Matthew L. Pride PO Box 701950 Tulsa OK 74170-1950 R Payne Family Limited 8890 N. 2445 Road Thomas OK 73669 Ranken Energy Corporation 417 W. 18th Street Edmond OK 73013 Ranken Energy Corporation 457 West 18th Street #101 Edmond OK 73013-3663 Red Bluff Resources Operating LLC Andrew Jennings 3030 N.W. Expressway Suite 650 Oklahoma City OK 73112 Red Rocks Oil & Gas Operating LLC Randy Stalcup 1321 N. Robinson Avenue Oklahoma City OK 73101 Red Wolf Operating LLC Jay Buckley 801 W. Covell Rd Edmond OK 73003 Rex M. Maloy 8805 S 70th East Avenue Tulsa OK 74133 Rimrock Resources Operating LLC 20 E. Fifth Street Suite 1300 Tulsa OK 74103 Roan Resources LLC Curtis Johnson 320 S Boston Ave Ste 900 Tulsa OK 74103-3729 Roy M. Maloy PO Box 690235 Tulsa OK 74169 Sandridge Exploration & Production LLC 123 Robert S. Kerr Avenue Oklahoma City OK 73102 Sandridge Exploration & Production LLC PO Box 654166 Dallas TX 75265-4166 Secretary of State 421 NW 13th Suite 210 Oklahoma City OK 73103 Securities and Exchange Commission 100 F Street NE Washington DC 20549 Securities and Exchange Commission New York Regional Office Attn: Andrew Calamari 200 Vesey St Suite 400 New York NY 10281-1022 Shadow Creek Merge Asse 10443 N May Ave Pmn 611 Oklahoma City OK 73120 Shepherd Royalty, LLC 8214 Westchester Drive Suite 740 Dallas TX 75225 Sheridan Holding Company 9 Greenway Plaza Ste 1300 Houston TX 77046-0922 SK Nemaha LLC 11700 Katy Freeway Suite 900 Houston TX 77079-1222 SK Plymouth LLC 11700 Katy Freeway Suite 900 Houston TX 77079-1222 Southern Echo, LLC Attn: Legal Dept. 120 Roberts S Kerr Ave Ste C7 Oklahoma City OK 73102-6439 Staghorn Petroleum II LLC 1 W. Third Street Suite 1000 Tulsa OK 74103 Stone Creek Operating, LLC 5728 NW 132nd St Oklahoma City OK 73142 T2 Land Resources, LLC PO Box 1263 Fort Worth TX 76101 Tanner Hicks 3817 NW Expressway Suite 840 Oklahoma City OK 73112-1400 Tapstone Energy LLC 211 N Robinson Ave Ste 1000 Oklahoma City OK 73102-7103 TAPSTONE ENERGY, LLC 100 E. MAIN STREET OKLAHOMA CITY OK 73104-0000 TEP Anadarko Basin Operating LLC 2000 McKinney Ave Ste 2050 Dallas TX 75201-2011 TEP Anadarko Basin Operating, LLC c/o Snow Spence Green LLP Attn: Kenneth P Green PO Box 549 Hockely TX 77447 TEP Anadarko Basin South III, LLC, TEP Anadarko Basin South IV, LLC and VP Stack 2929 Allen Parkway, Suite 1, LLC c/o Snow Spence Green LLP Attn: Kenneth P. Green 2800 Houston TX 77019 Territory Resources LLC 1511 S Sangre Road Stillwater OK 74074

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Exhibit A Served Via First-Class Mail

Name Attention Address 1 Address 2 City State Zip Texas Capital Bank N.A. P.O. Box 224315 Dallas TX 75222-4318 500 Winstead Building 2728 N. Texas Capital Bank, N.A. c/o Winstead PC Attn: Annmarie Chiarello Harwood Street Dallas TX 75201 Texas Capital Bank, N.A. Grant Leigh 2000 McKinney Ave Suite 1800 Dallas TX 75201 Texas Capital Bank, National Association Attn: Energy Banking Group 2000 McKinney Avenue Suite 1800 Dallas TX 75201 Texas Office of the Attorney General Ken Paxton 300 W 15th St Austin TX 78701 TGS-NOPEC Geophysical Company ASA and A2D Technologies, Inc. d/b/a TGS Geological Products and Services c/o Gieger Laborde & Laperouse, L.L.C Attn: Andrew A. Braun Suite 4800, 701 Poydras Street New Orleans LA 70139-4800 The City Of Oklahoma City 420 W Main #700 Oklahoma City OK 73102 Town of Cole 16066 252nd Street Blanchard OK 73010 TPR Mid Continent LLC 1100 Louisiana Street Suite 5100 Houston TX 77002 Triumph Energy Partners LLC 14001 Dallas Pkwy Ste 1200 Dallas TX 75240-7369 TRP Operating LLC Joey Bernica 9811 Katy Fwy Ste 225 Houston TX 77024-1282 U.S. Attorney's Office Southern District of Texas 1000 Louisiana St Suite 2300 Houston TX 77002 UNIT PETROLEUM COMPANY DEPT. 247 TULSA OK 741820000 Unit Petroleum Company Jon Strickler PO Box 702500 Tulsa OK 74170 Vanguard Operating LLC 5847 San Felipe Street Houston TX 77057-3399 Vinson & Elkins LLP PO Box 301019 Dallas TX 75303-1019 Wallace Family Partnership LP 508 W. Wall Street Suite 1200 Midland TX 79701 Walsh Mineral Properties LLC PO Box 54714 Oklahoma City OK 73154-1714 Warwick Bacchus, LLC 6608 N WESTERN AVE BOX 417 Oklahoma City OK 73116 Warwick Jupiter LLC Michael Brown 6608 N. Western Avenue #417 Oklahoma City OK 73116 Winstead PC Attorneys 2728 N Harwood Street Suite 500 Dallas TX 75201-1743 XTO Energy Inc. Noele Fischer PO Box 840791 Dallas TX 75284-0791

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Exhibit B

Case 20-31920 Document 376 Filed in TXSB on 11/04/20 Page 9 of 10

Exhibit B Served Via Electronic Mail Name Attention Email Acacia Energy Partners LLC Clayton Flurry [email protected] [email protected] Acacia Energy Partners, LLC c/o Foley Gardere, Foley & Lardner LLP [email protected] Apache Corporation Jay Buckley [email protected] BP America Production Company Wender Moreno [email protected] BP America Production Company c/o Liskow & Lewis [email protected] Camino Natural Resources LLC Mark Brown [email protected] Casillas Operating LLC Zach Malchi [email protected] Chaparral Energy LLC Justin P. Byrne, General Counsel [email protected] Cheyenne & Arapaho Tribes Tax Commission Oil & Gas Division [email protected] Cimarex Energy Company Kevin Smith [email protected] [email protected] Citation Oil and Gas Corp Matthew Thompson [email protected] Citizen Energy II LLC [email protected] Citizen Energy III LLC Curtis Johnson [email protected] Continental Resources Inc. Brooks Richardson [email protected] Devon Energy Production Company LP Amy Carpenter [email protected] [email protected] Echo E&P, LLC and Echo Energy, LLC c/o Sidley Austin LLP [email protected] Enable Gathering & Processing LLC Andy Bush [email protected] EOG Resources Inc. Dax Taylor [email protected] Gaedeke Oil & Gas Operating L.L.C. Brenda Loftis [email protected] Gaedeke Oil & Gas Operating, LLC c/o Pronske & Kathman, P.C. [email protected] Gulfport Midcon LLC Rebecca Addison [email protected] Harris County c/o Linebarger Goggan Blair & Sampson, LLP [email protected] [email protected] Matthew D. Cavenaugh, Elizabeth C. Freeman, [email protected] Jackson Walker LLP and Victoria Argeroplos [email protected] Jones Energy LLC Scott Van Sickle [email protected] Kirkland & Ellis LLP and Kirkland & Ellis International LLP Joshua A. Sussberg [email protected] Kirkland & Ellis LLP and Kirkland & Ellis International [email protected] LLP Anna G. Rotman and Jamie A. Aycock [email protected] Lime Rock Resources Operating Company Melissa Bell [email protected] Marathon Oil Company Todd Richards [email protected] [email protected] Marathon Oil Company c/o Bonds Ellis Eppich Schafer Jones LLP [email protected] [email protected] Office of the United States Trustee Hector Duran, Jr & Stephen Douglas Statham [email protected] In re: Echo Energy Partners I, LLC Case No. 20-31920 (DRJ) Page 1 of 2 Case 20-31920 Document 376 Filed in TXSB on 11/04/20 Page 10 of 10

Exhibit B Served Via Electronic Mail Name Attention Email Oklahoma County Treasurer Attn: Tammy Jones [email protected] Ovintiv Mid Continent Inc. Sarah Robertson [email protected] Paloma Partners IV LLC Lynn Graves [email protected] [email protected] Pivotal Petroleum Partners II LP c/o Haynes and Boone, LLP [email protected] Red Bluff Resources Operating LLC Andrew Jennings [email protected] Red Rocks Oil & Gas Operating LLC Randy Stalcup [email protected] Red Wolf Operating LLC Jay Buckley [email protected] Roan Resources LLC Curtis Johnson [email protected] Sandridge Exploration & Production LLC [email protected] Staghorn Petroleum II LLC [email protected] Tapstone Energy LLC [email protected] TEP Anadarko Basin Operating, LLC c/o Snow Spence Green LLP [email protected] TEP Anadarko Basin South III, LLC, TEP Anadarko Basin South IV, LLC and VP Stack 1, LLC c/o Snow Spence Green LLP [email protected] Texas Capital Bank, N.A. as Lender and [email protected] Administrative Agent c/o Winstead PC [email protected] Triumph Energy Partners LLC [email protected] TRP Operating LLC Joey Bernica [email protected] U.S. Attorney's Office Southern District of Texas Unit Petroleum Company Jon Strickler [email protected] Warwick Jupiter LLC Michael Brown [email protected] Warwick-Jupiter, LLC c/o McAfee & Taft A Professional Corporation [email protected] WesternGeco LLC c/o Gieger, Laborde & Laperouse, L.L.C. [email protected] XTO Energy Inc. Noele Fischer [email protected] [email protected] XTO Energy Inc. and ExxonMobil Corporation c/o Forshey & Prostok LLP [email protected]

In re: Echo Energy Partners I, LLC Case No. 20-31920 (DRJ) Page 2 of 2