Hedge fund manager David Einhorn's Greenlight has been pressuring GM to split its common stock into two classes to help boost its share price.

Glass Lewis agreed with the automaker that "there are a number of risks and uncertainties associated with Greenlight's plan and that it is speculative in nature," GM said. (http://bit.ly/2rYpykb)

(Reporting by Arunima Banerjee in Bengaluru; Editing by Arun Koyyur)