Malcolm Owen, AppleInsider:

Owners of Apple Card are reporting Apple is finally expanding the number of credit reference agencies it will report to, with claims the Apple-branded credit card is starting to appear on credit reports generated by Experian.

So far, Apple has limited its reporting of consumer balances to one credit bureau, TransUnion, while no reporting was being made to either Experian or Equifax. While this has been the case for months, it now seems that the reporting is being made to more agencies.

Have an Apple Card? Your credit behavior just got more exposure, with Goldman-Sachs being an extra creditor reporting to Experian.

See also, this Reddit thread of folks reporting Apple Card sightings on their Experian credit reports.