10b5-1 plans: The legal way for insiders to sell on a schedule
When you see a CEO sell $50 million of stock the week before a bad earnings report, the first question is: was that planned? The legal answer usually lives in a Rule 10b5-1 plan — a pre-arranged trading schedule that gives insiders a safe harbor against insider-trading allegations.
What Rule 10b5-1 actually is
Rule 10b5-1, adopted in 2000, lets corporate insiders trade their company's stock without legal exposure to insider-trading charges, as long as the trade is executed under a pre-existing written plan adopted when the insider was NOT in possession of material non-public information (MNPI).
A plan specifies the conditions under which trades will execute — for example, 'sell 10,000 shares on the first business day of each quarter at the prevailing market price' or 'sell shares when the stock crosses $200.' Once the plan is in place, the broker executes automatically; the insider doesn't choose the timing.
The 2023 SEC reforms
In December 2022 the SEC tightened the rule significantly, effective February 27, 2023. Highlights:
Cooling-off periods. Officers and directors must wait at least 90 days (or until the earnings release after the next two quarter-ends) after plan adoption before the first trade can execute. Previously plans could begin trading the same day.
No overlapping plans. Insiders can no longer run two or more plans at the same time on the same security.
Disclosure on Form 4. Trades made under a 10b5-1 plan must be flagged with a checkbox on the Form 4 filing itself.
Quarterly summary. Companies must disclose plan adoptions, modifications, and terminations in their 10-Q and 10-K filings.
How to read 10b5-1 trades
The Form 4 checkbox is now your friend. If the box is checked, the trade was scheduled in advance and isn't a reaction to current information. If the box is NOT checked, the insider exercised discretion at the moment of trade — that's the more interpretable signal.
Plan-driven sales are noisy: a CEO selling 20% of their position over 18 months under a 10b5-1 might be diversifying responsibly, not signaling distress. Plan-driven purchases are basically nonexistent — almost all open-market buys are discretionary.
Keep reading.
Educational content. Not investment advice. InsiderWire aggregates publicly-available SEC and Congressional filings — past activity is not a guarantee of future returns.