Reddit is evaluating a letter from Nokia Technologies alleging it infringed some of the telecom and cloud network firm’s patents, the social media platform said on Tuesday, ahead of its high-profile initial public offering (IPO) later this week.

The disclosure follows an inquiry by the Federal Trade Commission focused on Reddit’s sale, licensing and sharing of user-generated content with third parties to train artificial intelligence models.

Nokia did not immediately respond to a request for comment.

Reddit, which has been involved in patent infringement litigation in the past, is targeting a valuation of up to $6.5 billion for its IPO in one of the most-anticipated share sales in recent years.

The IPO is between four and five times oversubscribed, Reuters reported on Sunday, making it more likely to attain the target valuation. It is expected to debut on the New York Stock Exchange on March 21.

Reddit’s 100,000 online forums, dubbed “subreddits,” are known for the “meme-stock” saga of 2021 when retail investors collaborated on its “wallstreetbets” forum to buy shares of highly shorted companies such as video game retailer GameStop.

To tap into its popularity among retail investors, the company has reserved 8% of the total shares on offer for eligible users and moderators on its platform, certain board members and friends and family members of its employees and directors.