Tesla Inc shareholders approved a compensation package potentially worth as much as $2.6 billion for Chief Executive Elon Musk on Wednesday in a test of their confidence in the leader of the electric car company.

A Tesla spokesperson confirmed that shareholders had approved the measure at a special shareholder’s meeting in Fremont, California, but did not disclose the number of votes for or against, according to Reuters.

The proposed compensation award for the Silicon Valley billionaire, valued at up to $2.6 billion, involves no salary or cash bonus but sets rewards based on Tesla’s market value rising to as much as $650 billion over the next 10 years.

Ahead of the vote, a top investor in Tesla Inc and a major proxy adviser offered opposing views on whether to support the compensation arrangement, which required majority approval from shareholders.

The vote has been seen as a test of whether big investors are prepared to support such a large payout at the founder-led company.

Musk’s pay plan “is well aligned with shareholders’ long-term interests,” a spokesman for T. Rowe Price Group, Tesla’s fourth-largest investor with about 6 percent of its shares, told Reuters on Wednesday, without saying which way the Baltimore fund firm would vote.

Earlier this month, proxy advisory firm Institutional Shareholder Services recommended Tesla stockholders reject the package, saying the “unprecedented” award was too rich.