Nov 12 (Reuters) - ByteDance, the Chinese owner of TikTok, is planning to buy back up to $6 billion worth of shares from existing investors at a valuation of about $400 billion, The Information reported on Thursday, citing a letter to shareholders and a person familiar with the plans.

Reuters could not immediately verify the report.

(Reporting by Carlos Méndez in Mexico City. Editing by Alan Barona)