Hong Kong has been bracing for the outcome of the territory's largest ever national security trial for months.
Forty-five pro-democracy activists have been sentenced with jail terms ranging from four years to ten years.
They were accused of conspiracy to commit subversion after holding an unofficial primary election in Hong Kong in 2020. They were arrested in 2021.
Hong Kong authorities say the defendants were trying to overthrow the territory's government.
Democracy activist Benny Tai received the longest sentence of ten years. He became the face of the movement when thousands of protesters took to the city's streets during the "Umbrella Movement" demonstrations.
However, Hong Kong officials accused him of being behind the plan to organise elections to select candidates.
Tai had pleaded guilty, his lawyers argued he believed his election plan was allowed under the city's Basic Law.
Another prominent activist Joshua Wong received a sentence of more than four years.
Wong became one of the leading figures in the protests. His activism started as a 15 year old when he spearheaded a huge rally against a government plan to change the school curriculum.
Then in 2019 Hong Kong erupted in protests after the city's government proposed a bill that would allow extradition to mainland China. It peaked in June 2019 when Amnesty International reported that up to two million people marched on the streets, paralysing parts of Hong Kong's business district.
The extradition bill was later dropped but it had ignited a movement demanding political change and freedom to elect their own leaders in Hong Kong.
China's central government called the protests "riots" that could not continue.
Hong Kong introduced a national security law in the aftermath of the protests.
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The US has called the trial "politically motivated".
Dozens of family and friends of the accused were waiting for the verdict outside the West Kowloon Magistrates Court.
British citizen and media mogul Jimmy Lai is due to testify on Wednesday.
Meeting on the sidelines of the G20 in Brazil, British Prime Minister Keir Starmer told China's President Xi Jinping he's concerned about the health of Lai.
He faces charges of fraud and the 2019 protests. He has also been charged with sedition and collusion with foreign forces.