Top Reported Dirty Spot Charterers for 2017 Every year Poten ranks the dirty spot charterers to see who tops the list in each segment and which companies are moving up or down in the ranking of the largest reported dirty spot charterers*. Each year it is a game of “spot the difference”, because a lot of the positions do not change year over year. The top 4 of 2017 are the same as the top 4 of 2016. The biggest mover was ExxonMobil, which dropped from 5th in 2016 to 13th in 2017. Total fixtures were up 3.6%. Please fill out the form to read the article.