HIV Transmission along the Continuum of Care, 2016
HIV transmission rates from persons who are "taking ART and virally suppressed" were--zero. Most infections (8 out of 10) come from people living with HIV who do not know they are infected with HIV or do know but are not in HIV care.
These findings are presented in an MMWR from March titled Vital Signs: HIV Transmission Along the Continuum of Care — United States, 2016. The study used the CDC Progression and Transmission of HIV (PATH 2.0) model and data and national HIV surveillance data.