On December 22, 2016, Montreal traded Shipp to newly crowned MLS Cup champion Seattle Sounders FC in exchange for allocation money. Shipp made his Sounders debut on March 11, 2017, when he started against his former team in a 2–2 draw against Montreal. Shipp scored his first Sounders goal in a 3–1 win over New York on March 19, 2017, redirecting a shot by Joevin Jones into the goal. On June 16, 2020, Shipp announced his retirement from professional soccer to pursue an MBA at Northwestern University's Kellogg School of Management.