There have been questions about whether Nick Kingham would qualify for a fourth option year in 2018. John Dreker wrote about that in September, noting that there were conflicting reports on the rules for getting a fourth option. I recently confirmed with Pirates' Director of Minor League Operations Larry Broadway that Kingham does indeed have a fourth option year in 2018.
Kingham was added to the 40-man roster in November 2014, and was optioned for the 2015 season. He spent 29 days on the active roster in Indianapolis, before being shut down with an elbow injury that eventually required Tommy John surgery.