Radiologix Inc $0 Care Guide Inc $0 Altimmune, Inc $4,244,062 American Caresource Holdings, Inc. $927 Lantheus Holdings, Inc. $2,793,911 Radiologix Inc $0 Care Guide Inc $0 Altimmune, Inc $4,244,062 American Caresource Holdings, Inc. $927 Lantheus Holdings, Inc. $2,793,911