But today, according to FactSet, more than 90% of S&P 500 companies use their own metrics in an attempt to make their numbers look better. Some conceal revenue and other key numbers in hard-to-access tables. And a recent NYSE rule change has led some companies to report very early in the morning and pushed others to join the posse reporting after the closing bell, creating bottlenecks. While all this has meant more stress for reporters and analysts, it’s also made things harder for everyday investors trying to do due diligence on the companies they own. Experts say more companies seem to be breaking the most fundamental pact they have with their co-owners: to keep them informed of the true state of their business.