What is a 10b5-1 trading plan?
A Rule 10b5-1 plan is a written trading schedule an insider adopts while they (supposedly) hold no material non-public information. Once the plan is in place, a broker executes the trades automatically — so many shares on such dates, or at such prices — and the insider gets an affirmative defense against insider-trading charges even if the trades later coincide with big news.
The 2023 tightening
After research showed plan trades beating the market suspiciously often, the SEC tightened Rule 10b5-1 effective 2023: a mandatory cooling-off period before the first trade (90+ days for officers and directors), a ban on overlapping plans, limits on single-trade plans, and a checkbox on Form 4 itself identifying plan transactions.
Why it matters for reading Form 4s
- Plan sales are near-noise. A CEO selling monthly through a plan adopted a year ago tells you about their mortgage, not their outlook.
- Plan buys are scheduled, not reactive. Some insiders dollar-cost-average in through plans. Steady conviction, but not a fresh judgment about today's price.
- Discretionary open-market buys are the signal. An unscheduled code-P purchase is an insider looking at the current price and choosing to buy now. That's the transaction type we track, and when several insiders do it within days it forms a cluster buy.
The plan designation lives in the Form 4's checkbox and footnotes — one more reason to read the whole filing, or let us do it and browse the filtered result on the live cluster feed.
Frequently asked questions
- What is a Rule 10b5-1 plan in simple terms?
- A 10b5-1 plan is a written schedule an insider adopts in advance that lets a broker trade their company stock automatically, giving the insider a defense against insider-trading charges.
- Do 10b5-1 plan trades carry any signal?
- Very little — plan trades were scheduled months earlier, so they reflect an old decision rather than a fresh judgment about today's price.
- How can I tell if a Form 4 trade was made under a 10b5-1 plan?
- Since the SEC's 2023 amendments, Form 4 includes a checkbox identifying plan transactions, with the plan adoption date disclosed in the footnotes.