Investor Presentaiton

Emerging Basin Exploration - Mauritania / Senegal KOSMOS Giant gas resource base found at best-in-class metrics with significant remaining potential Exploration to date ENERGY. - Two phases of exploration completed 7 prospects tested with a success rate of ~60% Explore Discovered 40 Tcf of gas and derisked/delineated 40 Tcf at a cost of $0.20/boe for oil - First phase-Inboard Central Anticline Trend 3 discoveries, 100% success rate, Tortue, Marsouin, and Teranga Tortue discovery targeting first gas late 2021 Second phase - Outboard Basin Floor Fan Fairway 4 prospects tested, including 33% success rate in southern Mauritania/northern Senegal gas trend, and 0 for 1 in northern Mauritania oil trend Yaakar Field gas discovery (largest find in the world in 2017), together with Teranga creates potential additional gas hub Gained proprietary technical knowledge providing key petroleum system insights and competitive advantage for next phase of exploration Lamantin Hippocampe Marsouin Nouakchott Explore / appraise for gas MAURITANIA SENEGAL Tortue • Future exploration of this emerging basin - 2018 Drilling pause to integrate well results and rebuild prospect inventory 2019 and beyond Design and execute program to target oil in northern Mauritania (both inboard and outboard) Requin Tigre Yakaar Teranga Dakar Delineate gas resources in southern Mauritania /northern Senegal for additional gas hubs 50 km 60 miles SNE OIL Albian/CT Liquids or Gas Lead / Prospect Gas Discovery Gas Prospect Future 3D Seismic 18

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