Rule 10b5-1 Plans: Why the CEO Sold
Updated ·6 min read·Reviewed by the StockTools.ai Research Team
- ▸A Rule 10b5-1 plan is a written trading schedule adopted while the insider has no material nonpublic information, and it is a defense against insider-trading liability rather than a prediction about the stock.
- ▸Since February 2023, directors and Section 16 officers must wait through a cooling-off period before the first trade, generally 90 days or until two business days after the next quarterly results, capped at 120 days.
- ▸Other employees face a 30-day cooling-off period, and single-trade plans are limited to one in any 12-month period.
- ▸Form 4 now carries a checkbox stating whether a transaction was made under a 10b5-1 plan, which is the fastest way to separate a scheduled sale from a discretionary one.
- ▸Executives at companies with concentrated equity pay sell constantly for diversification and tax reasons, so a preplanned sale carries far less signal than the headline number suggests.
The problem the rule solves
A chief executive knows things about their company that the market does not, more or less permanently. That creates a bind: they are paid mostly in stock, they need to sell some of it to pay taxes and diversify, and any sale can look like trading on inside information after the fact. Trading windows help but do not solve it, because material information can arrive at any moment.
Rule 10b5-1(c) provides an affirmative defense. Adopt a written plan at a time when you hold no material nonpublic information, specify in advance the amount, price and dates of the trades or a formula that determines them, surrender discretion over execution, and trades that follow the plan are protected even if you later come into possession of such information.
The practical form is mundane. A plan might instruct a broker to sell 25,000 shares on the fifteenth of every month for eighteen months, or to sell in tranches whenever the stock trades above a set price. Once adopted, the executive cannot call the broker and stop it because the news is bad, and that surrender of control is the entire basis of the protection.
What changed in 2023
The original rule had gaps that were abused: plans adopted days before good news, plans cancelled just before bad news, and stacks of overlapping plans that let an insider pick which one to let run. The SEC adopted amendments in December 2022 that took effect on 27 February 2023, and they tightened all three.
The headline change is the cooling-off period. Directors and Section 16 officers cannot trade under a new or modified plan until the later of 90 days after adoption or two business days after the company discloses financial results for the quarter in which the plan was adopted, capped at 120 days. Everyone else at the company gets a 30-day cooling-off period. That gap between adopting a plan and being allowed to use it is what removes most of the value of adopting one on inside information.
The amendments also require directors and officers to certify at adoption that they are not aware of material nonpublic information and are acting in good faith, restrict overlapping plans for open-market trades, and limit single-trade plans to one in any twelve-month period. Companies must disclose the adoption, modification and termination of insider plans quarterly under Item 408 of Regulation S-K, and the good-faith requirement now runs for the life of the plan rather than only at adoption.
Reading the Form 4 checkbox
The most useful change for anyone watching insider filings is on the form itself. Forms 4 and 5 now include a checkbox indicating that a reported transaction was made under a plan intended to satisfy Rule 10b5-1(c), along with the plan adoption date. Before this, distinguishing a scheduled sale from a discretionary one meant reading footnotes that insiders were not required to write.
That box changes how a filing should be read. A chief financial officer selling $4 million of stock under a plan adopted eight months earlier decided to sell before whatever is happening now, and the timing carries close to zero information about their current view. The same $4 million sale with the box unchecked was a decision made recently, by someone with better information than you, and it is a different data point entirely.
The asymmetry between buying and selling is worth holding onto. Executives receive stock as pay, so selling has many innocent explanations: taxes, a house, diversification, a divorce. Buying has one. An open-market purchase filed on a Form 4 is an insider choosing to convert their own cash into more exposure to a company they already know intimately, and it is the rarer and more informative event.
Why insiders sell so much anyway
Follow the compensation. A senior executive at a large public company might take $1 million in salary and $12 million in equity. The stock vests on a schedule they do not control, it is taxed as ordinary income the day it vests, and the withholding is usually short of the true bill. Selling is not optional; it is how the tax gets paid and how the household avoids holding almost its entire net worth in one stock.
This is the same concentration problem ordinary employees face, at a scale where the consequences are severe and highly visible. A financial planner advising anyone else with 90% of their wealth in a single stock would tell them to sell steadily and diversify. Executives face identical advice plus a legal obligation to be seen doing it in an orderly, preannounced way, which is precisely what a 10b5-1 plan produces.
The signal that survives all of this is a change in pattern. An insider who has sold 20,000 shares every quarter for three years and sells 20,000 again is telling you nothing. An insider who terminates a plan early, or who suddenly sells far more than their established cadence, or who buys in the open market for the first time in years, has changed a behavior. Plan terminations now surface in quarterly disclosure specifically because the SEC considered that pattern break meaningful.
The limits of the defense
A 10b5-1 plan is an affirmative defense, not immunity. It fails if the plan was adopted while the insider possessed material nonpublic information, if the good-faith requirement is broken, or if the insider exercises influence over how or when trades occur after adoption. Prosecutors have brought cases against executives who adopted plans days before disclosing bad news, and the 2023 amendments exist because that pattern was frequent enough to measure.
Cancelling a plan is the grayer area. Terminating a plan is not itself a trade, so it does not directly violate the rule, but a well-timed cancellation ahead of good news can undermine the good-faith foundation the defense rests on, and it now becomes public through the quarterly disclosure requirement. Companies with sound policies discourage frequent adoption and cancellation for exactly this reason.
For an outside investor the practical takeaway is narrow and useful. Check whether the Form 4 box is ticked before treating a sale as a signal, look at the plan adoption date against the news, and weight buys far above sells. Everything else about insider activity is noise dressed as information, and the largest headline numbers are usually the least informative because they belong to the executives with the most equity to unwind.
FAQ
What is a Rule 10b5-1 plan?
A written plan adopted while an insider holds no material nonpublic information, specifying in advance the amount, price and timing of future trades. Following it provides an affirmative defense against insider-trading liability.
What is the cooling-off period?
For directors and Section 16 officers, the later of 90 days after adopting or modifying a plan or two business days after the company reports results for that quarter, capped at 120 days. For other employees it is 30 days.
How can I tell if an insider sale was preplanned?
Forms 4 and 5 include a checkbox indicating the transaction was made under a Rule 10b5-1(c) plan, together with the plan adoption date. A sale executed under a plan adopted many months earlier says little about the insider’s current view.
Does a 10b5-1 plan make insider selling legal in all cases?
No. It is a defense that fails if the plan was adopted while holding material nonpublic information, if the insider influences execution afterward, or if the good-faith requirement is not met throughout the life of the plan.
Is insider buying a better signal than insider selling?
Generally yes. Executives are paid in stock and sell for taxes, diversification and personal reasons, so sales have many innocent explanations. An open-market purchase means an insider chose to add exposure with their own cash.
When did the 10b5-1 amendments take effect?
The SEC adopted them in December 2022 and they became effective on 27 February 2023, introducing cooling-off periods, officer certifications, restrictions on overlapping plans and quarterly disclosure of plan adoptions and terminations.
Put it to work
Related guides
Sources & further reading
- ▸ SEC Rule 10b5-1 amendments, Release 33-11138 (December 2022)
- ▸ SEC Form 4, Statement of Changes in Beneficial Ownership
- ▸ Regulation S-K Item 408, insider trading arrangements and policies
More to learn
Educational only — not financial advice. Concepts simplified for clarity; markets are messier than definitions.