Citi Investment Research analyst downgrades Watson Wyatt on near-term concerns of combination

NEW YORK — Shares of Watson Wyatt Worldwide Inc. tumbled more than 7 percent in afternoon trading Monday after a Citi Investment Research analyst downgraded the stock to “Hold” from “Buy,” citing short-term concerns about the management consulting firm’s proposed combination with competitor Towers, Perrin, Forster & Crosby Inc.