Radiologix Inc $0 Care Guide Inc $0 Altimmune, Inc $4,208,694 American Caresource Holdings, Inc. $927 Lantheus Holdings, Inc. $1,980,777 Radiologix Inc $0 Care Guide Inc $0 Altimmune, Inc $4,208,694 American Caresource Holdings, Inc. $927 Lantheus Holdings, Inc. $1,980,777