Radiologix Inc $0 Care Guide Inc $0 Altimmune, Inc $3,483,667 American Caresource Holdings, Inc. $927 Lantheus Holdings, Inc. $2,035,471 Radiologix Inc $0 Care Guide Inc $0 Altimmune, Inc $3,483,667 American Caresource Holdings, Inc. $927 Lantheus Holdings, Inc. $2,035,471