ACRAMENTO — Californians would have more control over the collection of their health and financial data and there would be stiff penalties for companies that wrongly share and sell data about children under a November 2020 statewide ballot measure that will be submitted on Wednesday.

The proposal was drafted by San Francisco real estate developer Alastair Mactaggart, who last year used the threat of a ballot measure to pressure the California Legislature to enact sweeping new privacy protections. Although that law doesn’t take effect until January, Mactaggart said that it’s important to press ahead and do more.

“I think it’s a great baseline,” he said of the 2018 law, which will provide consumers with new information about their data that has been shared or sold. “But I think there are additional rights that Californians deserve.”

A central component of the ballot measure is additional consumer control over what Mactaggart calls “sensitive personal information,” including data on a person’s race, health, Social Security number and recent locations using GPS technology. If enacted by voters, the law would grant consumers the right to prevent that kind of data from being sold and or used for advertising purposes.