Realty Income (O), the publicly traded single-tenant REIT saw its share price drop 4.6% on a statement from hedge fund manager William Ackman of Pershing Square Capital Management. Mr. Ackman announced that his firm has taken a short position in the REIT, citing concerns about the REIT’s portfolio. From the New York Post article:

….[Mr. Ackman] believes that the commercial property outfit will get pinched as consumers further tighten their belts. He also accused the retail landlord of not being transparent about its roster of tenants, which he believes is of questionable quality and very vulnerable to market downturns.