Table of Contents Index to Financial Statements 135 4.18 Indenture  dated as of September 25  2017 between Southwestern Energy Company and U.S. Bank National Association  as trustee (Incorporated by reference to Exhibit 4.1 to the Registrant’s Current Report on Form 8-K filed on September 25  2017) 4.19 First Supplemental Indenture  dated as of September 25  2017 between Southwestern Energy Company and U.S. Bank National Association  as trustee (Incorporated by reference to Exhibit 4.2 to the Registrant’s Current Report on Form 8-K filed on September 25  2017) 4.20 Second Supplemental Indenture  dated as of April 26  2018 between Southwestern Energy Company  the guarantors named therein and U.S. Bank National Association  as trustee (Incorporated by reference to Exhibit 4.3 to the Registrant’s Current Report on Form 8-K filed on April 26  2018) 4.21* Third Supplemental Indenture  dated as of December 3  2018 between Southwestern Energy Company  the guarantors named therein and U.S. Bank National Association  as trustee 4.22 Fourth Supplemental Indenture  dated as of August 27  2020 between Southwestern Energy Company  the guarantors named therein and U.S. Bank National Association  as trustee (Incorporated by reference to Exhibit 4.2 to the Registrant's Current Report on Form 8-K filed on August 27  2020) 4.23* Fifth Supplemental Indenture  dated as of December 10  2020 between Southwestern Energy Company  the guarantors named therein and U.S. Bank National Association  as trustee 4.24 Form of 7.50% Notes due 2026. (Incorporated by reference to Exhibit 4.3 to the Registrant’s Current Report on Form 8-K filed on September 25  2017) 4.25 Form of 7.75% Notes due 2027. (Incorporated by reference to Exhibit 4.4 to the Registrant’s Current Report on Form 8-K filed on September 25  2017) 4.26 Form of 8.375% Notes due 2028. (Incorporated by reference to Exhibit 4.3 to the Registrant's Current Report on Form 8-K filed on August 27  2020) 10.1 Form of Second Amended and Restated Indemnity Agreement between Southwestern Energy Company and each Executive Officer and Director of the Registrant. (Incorporated by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K/A filed August 3  2006) 10.2 Form of Executive Severance Agreement between Southwestern Energy Company and each of the Executive Officers of Southwestern Energy Company  effective February 17  1999. (Incorporated by reference to Exhibit 10.12 of the Registrant’s Annual Report on Form 10-K (Commission File No. 1-08246) for the year ended December 31  1998) 10.3 Form of Amendment to Executive Severance Agreement between Southwestern Energy Company and each of the Executive Officers of Southwestern Energy Company prior to 2011. (Incorporated by reference to Exhibit 10.3 to the Registrant’s Annual Report on Form 10- K (Commission File No. 1-08246) for the year ended December 31  2008) 10.4 Form of Executive Severance Agreement between Southwestern Energy Company and Executive Officers Post 2011. (Incorporated by reference to Exhibit 10.4 to the Registrant’s Annual Report on Form 10-K (Commission File No.1-08426) for the year ended December 31  2011) 10.5 Southwestern Energy Company Supplemental Retirement Plan as amended. (Incorporated by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K filed on February 19  2008) 10.6 Southwestern Energy Company Non-Qualified Retirement Plan as amended. (Incorporated by reference to Exhibit 10.2 to the Registrant’s Current Report on Form 8-K filed on February 19  2008)  10.7 Amendment One to the Southwestern Energy Company Non-Qualified Retirement Plan (Incorporated by reference to Exhibit 10.9 to the Registrant’s Annual Report on Form 10-K (Commission File No. 1-08246) for the year ended December 31  2009) 10.8 Southwestern Energy Company 2013 Incentive Plan. (Incorporated by reference to Annex A of the Registrant’s Proxy Statement filed April 8  2013) 10.9 First Amendment to Southwestern Energy Company 2013 Incentive Plan. (Incorporated by reference to Exhibit 4.1 of the Registrant’s Current Report on Form 8-K filed on May 20  2016) 10.10 Second Amendment to Southwestern Energy Company 2013 Incentive Plan. (Incorporated by reference to Exhibit 4.1 of the Registrant’s Current Report on Form 8-K filed on May 30  2017) 10.11 Third Amendment to Southwestern Energy Company 2013 Incentive Plan. (Incorporated by reference to Exhibit 4.1 of the Registrant’s Current Report on Form 8-K filed on May 22  2019) 10.12 Southwestern Energy Company 2013 Incentive Plan Form of Performance Unit Award Agreement  for awards granted prior to February 25  2020. (Incorporated by reference to Exhibit 10.2 to the Registrant’s Current Report on Form 8-K filed on March 8  2018) 10.13 Southwestern Energy Company 2013 Incentive Plan Form of Performance Unit Award Agreement  for awards granted on or after February 25  2020 and prior to February 23  2021. (Incorporated by reference to Exhibit 10.13 to the Registrant's Annual Report on Form 10-K (Commission No. 001-08246) for the year ended December 31  2019)