Starboard Value may have a better-than-average track record in its proxy fights, but there have been no conflicts in recent history in which activist investors have successfully replaced the full board of a company Yahoo's size.
The firm's full sweep of Darden Restaurants' board in 2014 was the biggest replacement on record in FactSet's SharkRepellent database, but Yahoo is five times larger than Darden. Starboard recently announced it was launching a proxy battle to replace Yahoo's entire board.