Uber Technologies Inc.'s initial public offering (IPO), expected next month, will mean a massive payoff for many employees. In the company's hometown of San Francisco, it will also deepen fears that a wave of technology IPOs threatens to displace other residents who are being left behind. One city lawmaker plans to propose that tech companies share the wealth.

San Francisco Supervisor Gordon Mar is circulating a motion that, if approved by a majority of the county board, would place a payroll tax covering stock-based compensation on the November ballot. The proposal, a draft of which was obtained by Bloomberg, would impose a new cost, “for the privilege of engaging in business in the city,” on companies that dole out equity to employees.

Mar told local labor and community activists at a meeting Monday night that he plans to announce the proposal on Wednesday during a subcommittee hearing and to introduce it in the next couple weeks, said Kung Feng, executive director of Jobs With Justice San Francisco, a coalition of labor and community groups. A public agenda for that meeting lists “impacts on business tax revenue, housing costs, and gentrification” among the topics for discussion. Mar's office didn't respond to requests for comment, and Uber declined to comment because it hasn't seen the legislation.