The upcoming departure of analyst Michael Mayo from Credit Suisse First Boston is giving Chase Manhattan Corp.’s investment ranking a bit of a boost on Wall Street.

Mr. Mayo, who had rated Chase’s shares as a “hold,” last week dropped his entire banking coverage upon being notified by Credit Suisse First Boston that his job would be a casualty of the firm’s merger with Donaldson, Lufkin & Jenrette. On Monday, DLJ bank analyst Susan Roth reiterated a “buy” rating on Chase shares. Mr. Mayo’s low rating of Chase was not surprising. He was not bashful about using low ratings on stocks — his rating on Chase had been “sell” until it announced its deal last month to buy J.P. Morgan & Co., which he had also rated a “sell.”

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