Comment by jboggan

You can invoke CCPA (if applicable) and directly ask a covered business or registered data broker for an exact output of your existing information on their systems. This is honestly rare and most companies will find ways to deny you - asking for various documents to prove your identity and hoping you quit responding.

If you are a CA resident you can also get on the state's DROP platform to request that all registered data brokers delete your data, but it's only for deletion and not the other 4 types of data requests allowed under the CCPA (right to know, right to collect, right to opt out, and right to limit use).