Exhibit Number Description of Document 10.15 Deed of Assignment relating to Block 5 Offshore Sao Tome between the Democratic Republic of Sao Tome and Principe, Equator Exploration STP Block 5 Limited, Galp Energia S˜ ao Tom´ e e Pr´ ıncipe, Unipessoal, LDA and Kosmos Energy Sao Tome and Principe dated December 13, 2016 (filed as Exhibit 10.16 to the Company’s Annual Report on Form 10-K of the year ended December 31, 2016, and incorporated herein by reference). 10.16 Production Sharing Contract relating to Block 6 Offshore Sao Tome between the Democratic Republic of Sao Tome and Principe and Galp Energia S˜ ao Tom´ e e Pr´ ıncipe, Unipessoal, LDA dated October 26, 2015 (filed as Exhibit 10.6 to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2016, and incorporated herein by reference). 10.17 Addendum, dated November 9, 2015, to the Production Sharing Contract relating to Block 6 Offshore Sao Tome between the Democratic Republic of Sao Tome and Principe and Galp Energia S˜ ao Tom´ e e Pr´ ıncipe, Unipessoal, LDA dated October 26, 2015 (filed as Exhibit 10.7 to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2016, and incorporated herein by reference). 10.18 Deed of Assignment relating to Block 6 Offshore Sao Tome between the Democratic Republic of Sao Tome and Principe, Galp Energia S˜ ao Tom´ e e Pr´ ıncipe, Unipessoal, LDA and Kosmos Energy Sao Tome and Principe dated November 9, 2015 (filed as Exhibit 10.8 to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2016, and incorporated herein by reference). 10.19 Production Sharing Contract relating to Block 11 Offshore Sao Tome between the Democratic Republic of Sao Tome and Principe and ERHC Energy EEZ, LDA dated July 23, 2014 (filed as Exhibit 10.9 to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2016, and incorporated herein by reference). 10.20 Deed of Assignment relating to Block 11 Offshore Sao Tome between EHRC Energy EEZ, LDA and Kosmos Energy Sao Tome and Principe dated October 16, 2015 (filed as Exhibit 10.10 to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2016, and incorporated herein by reference). 10.21 First Addendum, dated December 17, 2015, to the Production Sharing Contract relating to Block 11 Offshore Sao Tome between the Democratic Republic of Sao Tome and Kosmos Energy Sao Tome and Principe dated July 23, 2014 (filed as Exhibit 10.11 to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2016, and incorporated herein by reference). 10.22 Deed of Assignment relating to Block 11 Offshore Sao Tome between the Democratic Republic of Sao Tome and Principe, Galp Energia S˜ ao Tom´ e e Pr´ ıncipe, Unipessoal, LDA and Kosmos Energy Sao Tome and Principe dated December 13, 2016 (filed as Exhibit 10.23 to the Company’s Annual Report on Form 10-K of the year ended December 31, 2016, and incorporated herein by reference). 10.23 Production Sharing Contract relating to Block 12 Offshore Sao Tome between the Democratic Republic of Sao Tome and Principe and Equator Exploration STP Block 12 Limited dated February 19, 2016 (filed as Exhibit 10.12 to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2016, and incorporated herein by reference). 167