Reporting Insider
A reporting insider is a person or company required to file insider trade reports in Canada — directors, the CEO/CFO/COO and other senior officers, and anyone who owns or controls 10% or more of a company's voting securities.
What is a reporting insider?
National Instrument 55-104 defines who is a "reporting insider" and must report on SEDI. The core categories are directors and senior officers of the issuer (and of significant subsidiaries), and any person or company that beneficially owns or controls, directly or indirectly, more than 10% of the issuer's voting securities.
Reporting insiders must file an initial report of their holdings when they become an insider, and a new report (Form 55-102F4) within 5 calendar days of each subsequent trade. This is the obligation that produces the SEDI data behind Form55's Signal Score.
Note the overlap with the early warning system: crossing 10% can make you both a reporting insider (filing trades on SEDI) and subject to early warning reporting (filing ownership disclosure on SEDAR+). The two regimes capture different things about the same large position.