Radiologix Inc $0 Care Guide Inc $0 Altimmune, Inc $4,014,175 American Caresource Holdings, Inc. $927 Lantheus Holdings, Inc. $2,620,044 Radiologix Inc $0 Care Guide Inc $0 Altimmune, Inc $4,014,175 American Caresource Holdings, Inc. $927 Lantheus Holdings, Inc. $2,620,044