** Shares of streaming platform Roku ROKU.O rise 2.9% to $91.2 premarket
** Brokerage KeyBanc Capital Markets upgrades ROKU to "overweight" from "sector weight"
** KeyBanc says that the combination of budget shift and ad innovation is creating multi-year tailwinds for ROKU
** "Roku is benefiting from a combination of secular drivers, monetization initiatives, and an expense "self-help" story," brokerage says
** 19 of 33 brokerages rate the stock "buy" or higher, 13 "hold" and 1 "sell"; their median PT is $87.5
** Up to last close, stock had risen 19.2% YTD
(Reporting by Harshita Mary Varghese in Bengaluru)
((HarshitaMary.Varghese@thomsonreuters.com))