Deep-pocketed investors have adopted a bearish approach towards Vistra (NYSE:VST), and it’s something market players shouldn’t ignore. Our tracking of public options records at Benzinga unveiled this significant move today. The identity of these investors remains unknown, but such a substantial move in VST usually suggests something big is about to happen. We gleaned this information from our observations today when Benzinga’s options scanner highlighted 21 extraordinary options activities for Vistra. This level of activity is out of the ordinary. The general mood among these heavyweight inves…