Manufacturing software vendor Plex has named Don Clarke as CFO. Clarke comes to the Troy, Mich.-based cloud company after having spent five years at Eloqua, which produces marketing automation applications, through its IPO in 2012 and purchase by Oracle early last year. Press accounts interpreted this as another part of Plex's own move towards an IPO of its own, supported by statements from Plex CEO Jason Blessing that it is following the steps to get to the public market.