Citigroup Punk, Ziegel & Co upgrades Sell to Mkt Perform. Punk Ziegel upgraded C to Market Perform from Sell saying since investors have been clamoring for Mr. Prince's resignation, it is likely that they will view his stepping aside as a positive event for the company. Moreover, a second major write down and reserve addition is likely to calm fears of unknown events causing disarray with the firm's capital. Plus, the maintenance of the dividend will add confidence. The firm does say that they view that Mr. Prince's resignation as a major negative for the co.