Group 1 - Devon Energy (DVN.US) experienced a decline of 4.22% in stock price on January 15, closing at $36.32, but saw a pre-market increase of 1.18% to $36.75 on January 16 [1] - Coterra Energy (CTRA.US) had a significant intraday increase of over 12% before closing up 1.46% [1] - Coterra Energy is reportedly exploring a potential merger with Devon Energy, which could result in one of the largest oil and gas transactions in recent years [1] Group 2 - Both companies hold substantial assets in the resource-rich Permian Basin and are currently in discussions regarding the merger [1] - One of the proposed options for the merger is an all-stock transaction [1]