2:32pm: The Yankees have acquired Stewart in exchange for right-hander George Kontos, reports MLB.com's Bryan Hoch (on Twitter).
Kontos, 26, allowed two runs in six innings for New York last September, his big league debut. He pitched to a 2.62 ERA with 9.2 K/9 and 2.6 BB/9 in 89 1/3 Triple-A innings.
2:13pm: Shea hears that Stewart is being traded to the Yankees, but it is not official and the team hasn't announced anything yet (Twitter link).
1:53pm: The Giants will trade Chris Stewart according to John Shea of The San Francisco Chronicle (on Twitter). The deal is pending at the moment. The backstop is out of options.
Stewart, 30, hit .204/.283/.309 in 183 plate appearances with the Giants last season after Buster Posey's injury. A release from the team says the trade will be announced later today. The details are unknown.