Exhibit 99.1

Rex Energy and Subsidiaries     Privileged & Confidential, Attorney Work Product, Attorney-Client Communication
Business Plan Overview     Preliminary Draft – Subject to Material Change
Scenario: April 17 Strip Pricing; Reduced Capex Case     Prepared at the Request of Counsel
Prepared in Contemplation of Litigation
U.S. $ 000’s    Forecast Forecast Forecast Forecast Forecast
2018    2019 202020212022
(Apr-Dec)    FY FY FY FY
Pricing    
NYMEX Oil ($/Bbl)    $ 64.29 $ 60.21$ 55.85$ 53.02$ 51.33
NYMEX Natural Gas ($/Mcf)    $ 2.88 $ 2.80$ 2.78$ 2.82$ 2.87
C2/Ethane ($/Bbl)    $ 10.20 $ 10.41$ 10.39$ 10.31$ 10.01
C3/Propane ($/Bbl)    $ 32.07 $ 28.65$ 26.52$ 26.05$ 25.31
Realized $/Mcfe    $ 3.15 $ 2.88$ 2.74$ 2.70$ 2.67
Production    
Oil & Condensate (Bbl)    624,661 434,259345,537284,228240,893
Natural Gas (Mcf)    36,010,379 50,015,60253,765,66657,658,37262,231,500
C2 (Bbl)    2,857,826 3,992,1934,431,8984,856,6325,258,749
C3 (Bbl)    1,879,708 2,490,0092,767,4473,026,6763,230,473
Planned Total Production (Mcfe)    68,183,550 91,514,37099,034,960106,663,589114,612,186
Mcfe/d    249,072 250,724271,329292,229314,006
Natural Gas, NGL and Condensate Sales    214,697 263,525271,126287,791305,581
Hedge Settlements    (3,665) (5,590)(2,679)(1,465)(658)
LOE    (105,552) (142,446)(153,427)(172,498)(183,039)
Cash G&A    (10,829) (15,637)(15,924)(16,091)(16,259)
MVC Adjustment    (3,556) (6,679)(902)726750
EBITDA    $ 91,094 $ 93,174$ 98,194$ 98,462$ 106,376
CAPEX    $ (66,373) $ (96,330)$ (59,992)$ (77,699)$ (87,539)
EBITDA Margin    42.4% 35.4%36.2%34.2%34.8%
LOE/Mcfe (incl. MVC)    $ 1.60 $ 1.63$ 1.56$ 1.61$ 1.59
G&A/Mcfe    $ 0.16 $ 0.17$ 0.16$ 0.15$ 0.14

DRAFT Privileged & Confidential, Attorney Work Product, Attorney-Client Communication Preliminary Draft – Subject to Material Change Prepared at the Request of Counsel Prepared in Contemplation of Litigation
Illustrative Stand-Alone Business Plan Summary – Reduced Capex Case

DRAFT Privileged & Confidential, Attorney Work Product, Attorney-Client Communication Preliminary Draft – Subject to Material Change Prepared at the Request of Counsel Prepared in Contemplation of Litigation
Illustrative Stand-Alone Business Plan Summary – Reduced Capex Case
2018E (Apr-Dec)    2019E 2020E2021E2022E2023E
EBITDAX    $89.3 $79.8$88.0$91.6$99.7$115.1
CapEx    (33.8) (72.7)(77.6)(71.2)(76.8)(76.6)
Restructuring Fees    (42.0) 0.00.00.00.00.0
Make-Whole Resolution    (50.0) 0.00.00.00.00.0
Working Capital Catch Up    (59.7) 0.00.00.00.00.0
Other    (1.6) (0.6)(0.6)(0.8)(0.1)(5.1)
Unlevered FCF    ($97.9) $6.4$9.8$19.6$22.8$33.4
Cash Int. & Fees    (32.6) (26.6)(27.4)(27.1)(26.8)(26.8)
Levered FCF    ($130.5) ($20.2)($17.6)($7.6)($4.0)$6.5
Beg. Cash    $25.1 $5.0$5.0$5.0$5.0$5.0
FCF    (130.5) (20.2)(17.6)(7.6)(4.0)6.5
Net Incremental Financing    110.4 20.26.30.00.00.0
Funding Needed    0.0 0.011.37.64.00.0
End Cash    $5.0 $5.0$5.0$5.0$5.0$11.5
First Out Revolver    $23.5 $43.7$50.0$50.0$50.0$50.0
First Out TL Bal.    250.0 250.0250.0250.0250.0250.0
Last Out Bal.    75.0 75.075.075.075.075.0
Total Debt    $348.5 $368.7$375.0$375.0$375.0$375.0
Available Revolver    $26.5 $6.3$0.0$0.0$0.0$0.0
Total Leverage    NA 4.6x4.3x4.1x3.8x3.3x
Total Net Leverage    NA 4.6x4.2x4.0x3.7x3.2x
CONFIDENTIAL AND PROPRIETARY INFORMATION OF STEPHENS INC| MEMBER NYSE SIPC 2