In presenting James River Group Holdings, Ltd.'s results, management has included financial measures that are not calculated under standards or rules that comprise accounting principles generally accepted in the United States ("GAAP"). Such measures, including underwriting (loss) profit, adjusted net operating (loss) income, tangible equity, tangible common equity, and adjusted net operating return on tangible equity (which is calculated as annualized adjusted net operating income divided by the average quarterly tangible equity balances in the respective period), are referred to as non-GAAP measures. These non-GAAP measures may be defined or calculated differently by other companies. These measures should not be viewed as a substitute for those measures determined in accordance with GAAP. Reconciliations of such measures to the most comparable GAAP figures are included at the end of this press release.