6. Staying Put: Bobby Lashley

Where he's currently employed: The WWE on their RAW brand.
Why he's not likely to change companies in 2019: His WWE contract is lucrative even if he's not in the main event picture at present time.
Bobby Lashley seems like he was born to be a pro wrestler. After a successful military career, the amateur wrestling standout joined the WWE and was given an instant push. Lashley took on two and even three enhancement talents at once during his build up, and wound up wearing mid-card gold.
He also participated in one of the highest-profile moments in Wrestlemania history, when he and Donald Trump shaved Vince McMahon's head live on Pay per view. However, Lashley wanted to branch out into MMA, and the WWE's stringent road schedule prevented this. He wound up signing with TNA/Impact on two separate occasions, both times wearing their big belt.
Now he's back in WWE, and despite the fact that he is being used mostly in the mid card he is said to be happy and satisfied with the company.