Professional Diversity Network Inc. received a letter from The Nasdaq Stock Market LLC regarding the company's failure to comply with one of the exchange's listing rules.

The company has not yet held an annual shareholders meeting within 12 months of the end of its fiscal year, according to an SEC filing.

Professional Diversity Network has 45 calendar days to submit a plan to regain compliance with the listing rule.

Professional Diversity Network's board postponed the company's 2019 shareholder meeting pending the results of the independent investigation conducted by the special committee of the board with assistance from independent outside legal counsel and auditor.