Despite a lengthy record of research into equity market investors' short-term responses to restructuring announcements, results remain ambiguous. In this study, we investigate investors' reactions to restructuring announcements based on the behavior of short sellers. Relative to other equity investors, short sellers are better equipped to discern whether restructuring plans will succeed. In a sample of corporate restructurings announced from 2010 to 2017, we find evidence of increased trading by short sellers on and after (but not before) restructuring announcements. We find a modest but significant association between short selling activity on or after the restructuring announcement and negative future stock returns. For cost restructurings, we find evidence of a strong association between short selling activity and the restructuring announcement and negative future stock returns, but not for asset restructurings. This result suggests short sellers only trade profitably on cost restructuring announcements, meaning those firms' restructuring announcements foretold bad news.