Radiologix Inc $0 Care Guide Inc $0 Altimmune, Inc $4,367,847 American Caresource Holdings, Inc. $927 Lantheus Holdings, Inc. $2,055,040 Radiologix Inc $0 Care Guide Inc $0 Altimmune, Inc $4,367,847 American Caresource Holdings, Inc. $927 Lantheus Holdings, Inc. $2,055,040