A Bahraini court acquitted a prominent opposition MP on Monday, while the country's leading female pro-democracy campaigner was also released.
Former MP Mattar Ebrahim was found not guilty on charges of unlawful assembly in public places.
"The last charge against me has been dropped," said Ebrahim, who had been charged with "undermining public security by assembling with a group of more than five people."
Ebrahim had spent nearly 100 days in jail, including 45 in solitary confinement, before being released on bail in August.
The court had already dropped two of the three charges he was being tried for – calling for regime change and spreading rumors linked to pro-democracy protests in the Gulf kingdom.
Matar was among 18 MPs who resigned last year in protest at the government's crackdown on demonstrations that erupted on February 14.
A statement from Matar's wife Amal, who is also an activist, said that while "it is a step in the right direction, we are concerned that the selectivity in dealing with the political cases related to freedom of expression reflects a whitewash and a way to improve the image of the government."
Protester Zainab Alkhawaja, known for her meticulous documenting of the struggle under the Twitter name @angryarabiya, was also released on Monday.
Alkhawaja had been arrested at a rally 8 days ago as she attempted to reach Pearl Square, the scene of pro-democracy protests last year until Bahraini and Saudi forces crushed the uprising.
The crackdown left 35 people dead, according to a government-led commission of inquiry into the violence.