What bureaus do brokerages use and report to, other than the big 3 credit bureaus?

[TyrannicalDuncery]

What bureaus do brokerages use and report to, other than the big 3 credit bureaus? I'm especially interested in bureaus that record "non-terrible" events, like the opening and closing of accounts, or the pulling of scores.

My quick ctrl+f through this document from the CFPB did not find the words "broker" or "stock," but I confess I did not actually read it. Plus I don't know whether maybe every brokerage implicitly comes with a bank account, and some of the process that goes with that.

As I understand it, Chex Systems records not only "terrible" things like fraud and stuff, but also "normal" things like account openings and pulls from Chex systems. But that's for banks. Is there something like this for brokerages?

Similarly, I would like to know what bureaus brokerages pull data from, although this is a much lower priority for me. My quick google seems to suggest that they often do a soft credit pull, and no Chex pull. But I could be wrong, and there are other bureaus out there....

[GatorGuy]

Some use Chex, some use Early Warning System. Fidelity definitely pulls EWS.

[cem13]

I use TastyTrade and they SP Equifax when I opened an IRA.  I already have a Brokerage account with them.  However, they saw the need to SP me on the new account.

[TyrannicalDuncery]

I was hoping I could get the TastyWorks SUB without pulling Chex or otherwise messing up my banking. You think my chances are any good?