Roku Inc. shares /zigman2/quotes/205087179/composite ROKU -3.79% are up 6% in Tuesday morning trading after Needham analyst Laura Martin raised her price target on the stock to $200 from $150. The new target is the highest listed on FactSet. Needham's increased optimism comes a day after Roku shares plunged 15% following a downgrade to underweight from Morgan Stanley. Martin recommends buying the dip on Roku and is upbeat about the company's potential to benefit from the launch of new streaming services, including from AT&T Inc. /zigman2/quotes/203165245/composite T -0.16% and Comcast Corp. /zigman2/quotes/209472081/composite CMCSA -0.43% . "In 2020, Roku's key upside valuation driver will be accelerating subscription [streaming-video-on-demand] revenues, which lowers investment risk, we believe," she wrote. "Additionally, Disney+, Apple+, Peacock/CMCSA and HBOMax/AT&T should accelerate customer acquisition spending, and Roku is a key beneficiary owing to its installed base of 32 million US connected-TV homes." She kept a buy rating on the stock, which has surged 373% so far this year, as the S&P 500 /zigman2/quotes/210599714/realtime SPX -1.05% has increased 23%.