I would try entities in the California data broker registry as a starting point. https://www.oag.ca.gov/data-brokers https://www.oag.ca.gov/data-brokers De-an

I would try entities in the California data broker registry as a starting point. https://www.oag.ca.gov/data-brokers https://www.oag.ca.gov/data-brokers De-anonymization shouldn't be that tough if you have the cash to pay for a handful of data sets that you think are likely to contain overlap.