Kosmos Energy Ltd. (NYSE:KOS) is included among the 8 Best Oil and Gas Penny Stocks to Buy Now. Kosmos Energy (KOS) - Among the Best Oil and Gas Penny Stocks to Buy Now Kosmos Energy Ltd. (NYSE:KOS) is a leading deepwater exploration and production company focused on meeting the world’s growing demand for energy. On March 23, Goldman Sachs raised its price target on Kosmos Energy Ltd. (NYSE:KOS) from $2 to $2.25, while maintaining a ‘Neutral’ rating on the shares. The bumped target indicates a downside ...