I checked the last of the three major credit bureaus today, checked a few months apart. Capital One (for the Venture Card 100k points match) hit me on Experian, Equifax and Transunion.

No other credit card I have applied hit me on two or three, only one hit per credit card.
Does anyone know what reporting agency do they use for the following:
- Amex Plat
- Barclays US Airways card
- Chase Sapphire Preferred