Integrity, Notification, and Fairness in Online Retail Marketplaces for Consumers Act or the INFORM Consumers Act This bill requires online marketplaces (e.g., Amazon) to collect and verify certain contact and financial information from third-party sellers whose transactions and related revenues exceed specified thresholds. Subject to certain exceptions, online marketplaces must clearly and conspicuously disclose the contact information of certain high-volume third-party sellers to consumers and must also provide consumers with methods to report suspicious activity on the marketplace. The bill provides the Federal Trade Commission and state attorneys general with the authority to enforce these requirements.