ISS A/S revenue for the last year amounted to 9.81 B CHF, the most of which — 3.82 B CHF — came from its highest performing source at the moment, Office-based, the year earlier bringing 4.07 B CHF. The greatest contribution to the revenue figure was made by Other — last year it brought ISS A/S 3.39 B CHF, and the year before that — 3.83 B CHF.