Well, a quick answer to this is- Capital One typically’ provides your credit information to Experian, Equifax, and TransUnion (the three national credit bureaus), once per month.
For the specific dates it provides your credit information to the three credit bureaus- not given. However, various posts by said cardholders’ give varying answers, with some saying at the end of every month, while others claiming this happens several days after every statement date. It may take a few days for the bureau to update your information.
Capital One doesn’t specify on its website the content of its report, but various posts in online forums indicates they share your card balances with the three bureaus. After all, the credit bureaus are only interested in your balance and credit limit. With this information, they can easily determine your utilization ratio.
Irrespective of when Capital One report to credit bureaus, it is best to maintain a positive credit report across the credit bureaus. You can do this by keeping your debt balances low and paying your debts on time.