Greenlight Capital, which has been pressuring General Motors to restructure its share class, said on Tuesday it believed the automaker’s shareholders will vote in their best financial interests and support the hedge fund’s two-class stock proposal and nominees for the board.

A representative for General Motors said Greenlight’s proposal to create two classes of stock represents an “unacceptable risk and is not in the best interests of shareholders.”

In a broad-ranging letter to investors about the first quarter of 2017, seen by Reuters, Greenlight also said it had added three new long positions and exited several short positions. Greenlight is run by billionaire investor David Einhorn.

Greenlight added bets on Conduent, Perrigo and an unnamed European financial institution. The hedge fund said it lost money on bets against three Canadian banks.

Greenlight has contended for some time that General Motors shares are undervalued and says it has a plan to boost the automaker’s valuation.

A spokesman for Greenlight, Jonathan Gasthalter, declined to comment.

Einhorn proposed in late March that the US automaker create one class of stock that pays a dividend and one that does not, but would be tied to General Motors’ potential growth.

No other General Motors shareholder has backed Einhorn’s proposal, with Warren Buffett’s Berkshire Hathaway remaining conspicuously silent.

Moody’s Investors Service and S&P Global Ratings said such a structure could hurt the automaker’s credit rating.

Einhorn has since floated three nominees for General Motors’ board and accused the automaker of misrepresenting his plan to rating agencies, a claim General Motors has rejected.

“We believe others recognize that the stock is deeply undervalued and when shareholders grasp the math and the extent of General Motors’ behavior, they will vote with their wallets and for needed change at the Board level,” the letter dated April 25 said.

General Motors shares closed 0.2 percent higher at $33.99 on Tuesday.

Greenlight also said that Tesla, the electric carmaker that earlier this month briefly passed General Motors as the most valuable US automaker, was overvalued.

Greenlight said in the letter that sooner or later what it called the Tesla bubble was bound to burst. “There was no catalyst that we know of that burst the dot-com bubble in March 2000, and we don’t have a particular catalyst in mind here,” the letter said. “That said, the top will be the top and it’s hard to predict when it will happen.”