Southwestern Energy Announces Public Offering of $350 Million of Senior Notes

Southwestern Energy Company (“Southwestern Energy”) (NYSE: SWN) today announced that it is commencing, subject to market conditions, a registered underwritten public offering (the “Offering”) of $350 million aggregate principal amount of senior notes due 2028 (the “Notes”).

Southwestern Energy intends to use the net proceeds from the Offering, together with the net proceeds received from its recent common stock offering and borrowings under its credit agreement, to fund a redemption of Montage Resource Corporation’s (“Montage”) issued and outstanding Senior Notes (the “Montage Notes”) that it will assume upon the closing of its recently announced merger with Montage (the “Merger”).

Citigroup, BofA Securities and Wells Fargo Securities are acting as representatives of the underwriters and joint book-running managers for the Offering. The Offering is being made under an effective automatic shelf registration statement on Form S-3, as amended (Registration No. 333- 333-238633), filed by Southwestern Energy with the Securities and Exchange Commission (“SEC”) and only by means of a prospectus supplement and accompanying prospectus. A preliminary prospectus supplement has been filed with the SEC to which this communication relates. Prospective investors should read the preliminary prospectus supplement and the accompanying prospectus included in the registration statement and other documents Southwestern Energy has filed with the SEC for more complete information about Southwestern Energy and the Offering. These documents are available at no charge by visiting EDGAR on the SEC website at http://www.sec.gov.

Alternatively, a copy of the base prospectus and the preliminary prospectus supplement may be obtained, when available, from:

Citigroup
c/o Broadridge Financial Solutions
1155 Long Island Avenue
Edgewood, NY 11717
Telephone: [phone]

BofA Securities
NC1-004-03-43
200 North College Street, 3rd floor
Charlotte NC 28255-0001
Attention: Prospectus Department
Telephone: 1‐800‐294‐1322
Email: [e-mail]

Wells Fargo Securities
550 S. Tryon Street, 5th Floor
Charlotte, NC 28202
Email: [e-mail]
Fax: [phone] (with such fax to be confirmed by telephone to [phone])
Attention: Leveraged Syndicate

This news release shall not constitute an offer to sell or the solicitation of an offer to buy these securities or the Montage Notes, nor shall there be any sale of these securities, in any state or jurisdiction in which such offer, solicitation or sale of these securities would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.