FWIW- Just checked my free Experian report from AmEx and all my pulls were on it (I'm in DC). There was no SPG biz card pull but I assume they did one for personal & biz. Citi was on for two personals but biz was missing. Again either one pull for both or biz accounts don't show on personal credit accounts. Chase was also on it.
I like CreditKarma (TransUnion) but in DC almost every pull seems to be on Experian. Very limiting and why the free AmEx report is good.