Nippon Telegraph and Telephone (OTCMKTS:NTTYY – Get Rating) was upgraded by investment analysts at Citigroup from a “neutral” rating to a “buy” rating in a report issued on Monday, The Fly reports. NTTYY traded down $0.07 during trading on Monday, reaching $31.68. 211,300 shares of the company’s stock were exchanged, compared to its average volume […]