Shares of Roku Inc. undefined are up more than 13% in Monday trading after the company announced that NBC's Peacock streaming service would now be available on its platform. Peacock, which is owned by Comcast Corp. undefined, offers a free version as well as paid tiers. "The ad sharing agreement in the Peacock deal could be a benchmark for others," Deutsche Bank's Jeffrey Rand said in an August note to clients, though Roku and Comcast didn't provide details about their ad-sharing arrangement in the release. Comcast shares are off 2.4% in Monday's session. They've added 13% over the past three months as Roku's stock has risen 42%.