Guardant Health needs cash. Until it can get it from selling enough services, it must sell its own shares instead. Shares of precision medicine company Guardant Health (GH -11.13%), which specializes in liquid biopsies to test for cancer, fell 10.6% through 10:05 a.m. ET Monday morning. Monday was the first trading day in which investors got to react to a Guardant announcement late Friday, that it plans to sell stock and raise $400 million in new cash to fund its operations. Guardant needs money Guardant's ...