France's financial regulator has warned 90 unlicensed crypto firms ahead of the end-June deadline for applying the European Union's Markets in Crypto-Assets (MiCA) rules, Cointelegraph reported on Tuesday.

According to the French financial markets authority (AMF), 30 percent of the firms did not respond on whether they had applied for a licence, and 40 percent said they do not plan to obtain one. The AMF has required firms to comply with MiCA since November last year. It warned that firms that fail to comply could be shut down from July.

Only a small number of crypto firms in France currently hold a MiCA licence. CoinShares and Swiss bitcoin app Relai are among them. The European Securities and Markets Authority (ESMA), a key EU supervisory body, has called on unlicensed crypto firms to draw up plans for an orderly wind-down.

The European Commission proposed granting ESMA authority to supervise all EU crypto firms, but the industry has raised concerns that this could delay licensing and hinder startup growth. France supports strengthening ESMA's supervisory powers, while some member states, including Malta, oppose it, Cointelegraph reported.