“Thirty percent support for the proposal in its first year at Uber shows a significant base of support for this reform, which we believe will only grow over time,” a spokeswoman for the Teamsters said Tuesday. “Transparency and accountability are necessary at Uber and throughout the ‘gig’ industry.”

Michael Connor, executive director of Open MIC (Media and Information Companies Initiative), a nonprofit that works on socially responsible investing, agreed with that assessment.

“[It’s] a strong signal that the underlying issues are important to an influential contingent of investors — and the company’s board and management would be wise to begin addressing those issues,” he said.

Michael Connor, executive director of Open MIC (Media and Information Companies Initiative), a nonprofit that works on socially responsible investing and shareholder engagement, told MarketWatch that recommendations by Glass Lewis and ISS, which advise many of the world’s largest asset managers, “are a big deal and can translate into an additional twenty percentage points or more in the final tabulation for a proposal.”

The San Francisco-based company’s investors are scheduled to vote on this and other proposals at the May 10 annual shareholder meeting.