(Reuters) - Institutional Shareholder Services recommended investors vote against ratifying the pay plan of Tesla CEO Elon Musk at the electric carmaker's June 13 annual meeting, calling the award value "outsized."

In a report sent by a representative late on Thursday the proxy adviser also recommends votes against Tesla director James Murdoch, but recommended votes for director Kimbal Musk and for the company's proposed move to change its state of incorporation to Texas from Delaware.