Integrity, Notification, and Fairness in Online Retail Marketplaces for Consumers Act or the INFORM Consumers Act This bill requires online marketplaces to collect, verify, and disclose certain information from high-volume, third-party sellers. High-volume, third-party sellers include online marketplace participants that conduct 200 or more transactions resulting in total revenues of $5,000 or more during a continuous 12-month period. Online marketplaces must acquire these sellers' (1) bank account numbers, (2) government-issued identification, (3) tax identification numbers, and (4) contact information. Online marketplaces must verify this information and annually certify any changes to it. Further, online marketplaces must make certain information (e.g., sellers' names and contact information) available to consumers through the sellers' product listings and provide consumers with methods to report electronically and by telephone any suspicious activity on the marketplace. The bill provides the Federal Trade Commission with the authority to enforce these requirements.