technology stocks are in the midst of their worst selloff in years upheaval in the currencies market might make the rout even worse large technology companies generate 58 of their revenue outside of the us—the highest share of the sp 500’s 11 groups according to factset that makes them particularly vulnerable to fallout from the surging dollar when the dollar strengthens sales that companies earn in nondollar currencies are worth less that in turn can shave millions of dollars off company earnings