Chesapeake Energy (CHK) is set to buy Southwestern Energy (SWN) for an all-stock deal valued at $7.4 billion. This would make Chesapeake the top US natural gas producer. Yahoo Finance Anchors Brad Smith and Seana Smith break down the latest development for these two companies and the impact it will have on the energy sector at large. For more expert insight and the latest market action, click here to watch this full episode of Yahoo Finance Live. Editor's note: This article was written by Nicholas Jacobino