Morgan Stanley Downgrades National-Oilwell Varco To Underperform By: Benzinga via Benzinga April 29, 2015 at 08:03 AM EDT Analysts at Morgan Stanley downgraded National-Oilwell Varco, Inc. (NYSE: NOV) from Equal-weight to Underperform. The price target ... Read More >> Related Stocks: Natl Oilwell Varco