Ganfeng said in a response to Reuters that no discussions on a floor price had taken place.
Zhicun Lithium, one of the top lithium carbonate producers in China, was also represented at the meeting, said four of the people, but could not be reached for comment.
It is not clear how long the companies, which account for over half China's lithium carbonate output, will follow the floor price.
However, some buyers were sceptical that producers would stick to the floor price, given the sluggish demand.
"If we don't buy, someone will eventually drop the price," said a lithium carbonate buyer briefed on the decision.