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Investing.com -- Goldman Sachs downgraded Kosmos Energy to sell from neutral in a note on Thursday, arguing that the stock's substantial year-to-date rally has left it overvalued relative to larger-cap peers that offer more compelling risk/reward.
Analyst Neil Mehta acknowledged the factors behind Kosmos's surge, which has made it the best-performing stock in the XOP energy ETF this year, but said the run has gone too far.
"After sharp outperformance, we see less upside than to larger cap peers," Mehta wrote.
Goldman attributed the roughly 200% year-to-date gain to three drivers, including improved production volumes at the Tortue LNG project in Mauritania and Senegal following a challenging start-up, significant oil price sensitivity as investors raised mid-cycle Brent expectations toward Goldman's own $75 per barrel outlook, and steps taken by management to reduce debt.
Despite those positives, Goldman outlined four reasons for caution at current levels.
Leverage is said to remain elevated even after a strong 2026, limiting the company's capacity to return capital to shareholders.
Meanwhile, the bank explained that the cost structure, while improving, stays high given the maturity and scale of its asset base.
Goldman also argued that execution risk, asset concentration and geographic exposure justify a higher cost of capital for the stock.
Finally, the firm cited a track record of earnings and production execution that has been "more mixed relative to GS/consensus models."
Among alternatives, Goldman flagged ConocoPhillips, which is a conviction list buy, as its preferred large-cap name, alongside Ovintiv, Permian Resources and Viper Energy in the mid-cap space.