Solutions30 shares were down by around 34% in early trading.
Solutions30 issued a statement on Dec 14 in which the company said it had been the target of a destabilisation campaign using "malicious and disloyal methods."
It added it had appointed the law firm August Debouzy to file a complaint with the Parquet National Financier - France's financial crimes investigator's office - over the dissemination of false and misleading information.
(Reporting by Sudip Kar-Gupta, editing by Louise Heavens)