The news comes two weeks after the girl group sent an ultimatum to Ador parent company Hybe - which is behind K-pop sensation BTS - telling the firm they would terminate their contract unless a set of demands was met.
"From midnight today, our contract will be terminated with Ador," member Minji said at a press conference.
NewJeans made their debut in 2022 and the K-pop phenomenon is among Hybe's most successful groups.
Band member Hanni said on Nov 28 the group have "faced mistreatment, not just towards us but also our staff", without elaborating.
NewJeans experienced "deliberate miscommunications and manipulation regarding multiple areas", she said.
"This is not the type of work ethic we respect and not one we want to be a part of, and to continue working under a company with no intention of protecting NewJeans would only do us harm," said Hanni.
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