Over the past two decades, the regulatory landscape for non-GAAP reporting has evolved significantly. Despite a temporary decline in the frequency of non-GAAP reporting following Regulation G, the incidence of non-GAAP disclosure has continued to increase steadily, leading to a current all-time...

We use a novel dataset to examine the across-time consistency and across-firm comparability of firms’ non-GAAP earnings disclosures. We begin by identifying firms that change their non-GAAP earnings definition from one year to the next. These deviations are uncommon, but when managers change...