The 74-year-old media mogul Jimmy Lai is convicted, along with former journalist Gwyneth Ho and activist Chow Hang-Tung, of illegally initiating and participating in a banned memorial service.
A verdict that in practice will make minimal difference, according to The Guardian.
They are among two dozen pro-democracy politicians and activists last to receive their verdict after denying the allegations.
The trio have been detained since the time of the vigil.
Jimmy Lai is the founder of the now defunct, democratic newspaper Apple Daily.
The magazine was one of the best-selling Chinese magazines in Hong Kong between the years 1995-2021.
Organized for three decades
The vigil took place in June 2020 and commemorates the massacre at Tiananmen Square in 1989, where democracy activists were killed by military forces.
The vigil is a tradition in Hong Kong and has been organized for three decades.
It was banned, for the first time, last year due to coronary restrictions.
Critical voices have been raised that the authorities use the pandemic as an excuse to silence pro-democratic voices, writes The Guardian.
Others convicted as a result of the vigil are Democracy campaigner Joshua Wong, whose sentence included 10 months in prison.
Listen to Jimmy Lai in the clip above and see the arrest.