Tesla Motors' SolarCity deal gets a boost from shareholder advisory firm

Institutional Shareholder Services (ISS) on Friday recommended that investors in both companies approve Tesla Motors' plan to buy solar panel installer SolarCity for more than $2 billion. ISS' backing of the deal is a key endorsement at a time when shareholder resistance against the takeover remains high. SolarCity's stock rose 9 percent on Friday to $20.40.