Materiality determinations require listed entities to disclose and update material events promptly under board approved policy and timelines. Listed entities must disclose events or information deemed material by the board, with certain Schedule III events treated as material and others assessed under prescribed materiality criteria. The board must adopt and publish a materiality determination policy and authorise Key Managerial Personnel to decide and disclose material events to stock exchanges. Disclosures must follow prescribed timelines, be updated until resolution, cover material subsidiary information, be hosted on the entity's website, and respond to exchange queries; communications from authorities must be disclosed with the event unless prohibited.