PRINCIPAL FINANCIAL GROUP INC revenue for the last year amounted to 13.30 B EUR, the most of which — 6.57 B EUR — came from its highest performing source at the moment, Retirement and Income Solutions, the year earlier bringing 5.58 B EUR. The greatest contribution to the revenue figure was made by United States — last year it brought PRINCIPAL FINANCIAL GROUP INC 10.69 B EUR, and the year before that — 9.61 B EUR.