Form 4

Form 4 is an SEC filing that reports transactions (buys, sells, options exercises, gifts) of a company's stock by insiders including officers, directors, and large shareholders (> 10% ownership). Filed within 2 business days of the transaction, Form 4 is the primary source for tracking insider activity.

Formula

Form 4 Requirement: Any transaction > $0 by an insider must be filed within 2 business days.

Example

The CEO of Microsoft (MSFT) exercises stock options to buy 10,000 shares. She must file a Form 4 within 2 business days reporting the transaction date, price, and current holdings. Investors can view this filing on SEC EDGAR and track insider activity.

How to Interpret It

• Form 4 Buy: Insider buying stock with personal money, often bullish signal (insider has conviction).
• Form 4 Sell: Insider selling stock; less conclusive (could be tax, diversification, or opportunity elsewhere).
• Options Exercise: Executive exercised stock options; not as informative as a personal market purchase unless followed by a hold.
• Batched filings: Insider selling can be batched and reported later, sometimes showing holdings after market-moving news.
• Holdings increase/decrease: Track whether insider holdings are growing or shrinking to gauge conviction.

Limitations

• Insiders are often required to sell to exercise options or pay taxes; selling doesn't indicate pessimism.
• Form 4 filed within 2 business days means news is delayed; by the time you see it, an insider may have already acted.
• Rule 10b5-1 plans are pre-set trading programs, removing timing discretion and making the activity less meaningful.
• Small transactions (< $1,000) don't move markets but still must be filed, creating noise.

Related Terms

• Insider Trading — the activity reported on Form 4
• Form 3 — filed when an insider first takes position, establishing baseline
• Form 5 — annual summary of insider transactions
• 10-K — annual report with executive compensation disclosures