Boston Omaha subsidiary Fiber Fast Homes appoints Randy Cosby, co-founder of Boston Omaha subsidiary InfoWest, as CEO ... Basil Sgourdos retiring as group chief financial officer-financial director of internet companies Naspers and Prosus, effective Nov. 30 ... IoT safety company Blackline Safety appoints Robin Kooyman, ex-Charger Ready Properties, as chief financial officer, effective Sept. 9 ... SaaS platform Semrush appoints Veronique Montreuil, ex-Covetrus, as chief customer and data officer ... Tech provider MelroseINC hires ex-Avid Technology’s JoLaine Hamwey and Joe Vandenberg as directors, respectively, for business development-cloud services and post-production engineering; promotes Zeke Margolis to vice president-cloud solutions ... IoT data company Samsara names former Square CEO Alyssa Henry to board.