The initial statement of beneficial ownership for new corporate insiders.
Definition
Form 3 is a document submitted to the SEC by individuals who have newly become corporate insiders—such as a newly hired executive, a recently appointed board member, or an investor who just crossed the 10% ownership threshold. It must be filed within 10 days of becoming an insider.
Why it matters for Whale Tracking
Form 3 establishes the baseline of an executive's portfolio. Quantitative tracking models use Form 3 to know exactly how many shares an insider holds before they begin trading, making it possible to calculate the percentage impact of their future Form 4 purchases or sales.
Technical Nuance
Form 3 filings often show zero shares owned at the time of hire, which can be misleading. It's crucial to understand that the insider's actual ownership may be much higher due to unvested equity grants or shares held in trusts. Therefore, Form 3 should be used as a starting point for tracking, but analysts must also consider subsequent Form 4 filings to get the full picture of an insider's holdings.
Track SEC Form 3s Live
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Real-World Example
"When a new CFO is hired at Amazon (AMZN), they file a Form 3 declaring they currently own 0 shares. This initializes their profile in the database, ready to track their future equity grants and trades."
Fundamental Quant Thesis
Go beyond the raw data. Read institutional-grade analysis on why sec-form-4 insiders are moving capital and the long-term structural impact.