Rule 10b5-1 Trading Plans Explained

Rule 10b5-1 is an SEC regulation, adopted in 2000, that lets corporate insiders set up a written plan to buy or sell company stock at predetermined times, prices, or quantities - provided they establish the plan while not in possession of material non-public information (MNPI). When a trade later executes under the plan, the insider has an affirmative defense against insider-trading allegations even if they happen to hold MNPI on the day of the trade.

How a 10b5-1 plan works

An executive who wants to diversify or fund a large purchase can't simply sell whenever they like - they are often in possession of MNPI, or inside a blackout window. A 10b5-1 plan solves this: they hand discretion to a broker in advance via a formula (for example, "sell 10,000 shares on the first trading day of each quarter"). Because the timing is set ahead of time, the individual trades are insulated from any later information advantage.

Why the rule exists

Before 2000, insider-trading law left executives in an awkward spot. Courts disagreed about whether merely possessing material non-public information while trading was enough for liability, or whether the government had to show the information was actually used. That uncertainty made it legally risky for an executive to sell any stock at all, even for reasons as ordinary as buying a house, because they almost always know something the market does not. Rule 10b5-1 resolved this by adopting an awareness standard for liability and, in exchange, creating the affirmative defense for pre-scheduled plans. The bargain: give up control over trade timing, gain legal safety.

How to spot 10b5-1 trades on Form 4

Filers usually disclose the plan in the Form 4 footnotes or remarks, with language such as:

• "Sale effected pursuant to a Rule 10b5-1 trading plan adopted on [date]."
• "This transaction was made pursuant to a 10b5-1 plan."

Since the 2023 reforms, Form 4 also includes a dedicated checkbox indicating whether a reported transaction was made under a 10b5-1 plan, which makes detection more reliable. InsiderAlpha scans both the checkbox and the footnote text.

Why these trades are less informative

The entire point of a 10b5-1 plan is that the insider does not control the timing of any individual trade. So a 10b5-1 sale is not evidence that the insider thinks the stock is overvalued today - the calendar simply said "sell." This is why filtering plan trades out of the signal is essential: they are the single biggest source of false "insider selling" alarms.

The same logic sharpens what remains. Once plan trades are set aside, an unflagged, discretionary sale deserves closer attention precisely because the insider chose the moment. Filtering does not just remove noise from the sell-side feed; it concentrates the information in the trades that are left.

The 2023 SEC reforms

Effective February 2023, the SEC tightened the rule significantly:

• A 90-day cooling-off period for officers and directors (and 30 days for the company itself) before any trade can occur under a newly adopted or modified plan.
• A requirement that single-trade plans be limited to one per 12-month period.
• A good-faith certification, and a bar on overlapping plans.
• Quarterly disclosure of plan adoptions and terminations in company filings.

The reforms responded to a body of academic and journalistic work showing that some executives used plans strategically: adopting a plan and trading within days, running multiple overlapping plans and cancelling the unfavorable ones, or terminating a plan just before news. The cooling-off period and the good-faith condition were designed to close those doors. The current rule text is on the eCFR.

How common are 10b5-1 trades? What the data shows

Planned trading is a sale phenomenon, not a purchase phenomenon. In the first quarter of 2026, across the primary Form 4 filings InsiderAlpha tracks, 49.6% of the 19,584 insider sale transactions carried a Rule 10b5-1 marker, either the dedicated checkbox or plan language in the footnotes. Among the 4,600 open-market purchases in the same window, only 2.6% did.

Two practical conclusions follow. First, roughly half of all insider selling tells you nothing about the insider's current view, because a calendar chose the date. Any screen that treats raw insider sales as bearish is majority noise before it starts. Second, purchase signals survive 10b5-1 filtering almost untouched, which is one reason buy-side signals are so much cleaner than sell-side ones. Note that these figures rely on what filers disclose; a plan trade with no checkbox and no footnote language would be missed, so treat the percentages as a floor.

How InsiderAlpha uses the flag

Every transaction we store carries a 10b5-1 flag derived from the Form 4 checkbox and a footnote scan. In scoring, flagged purchases are discounted rather than treated as conviction buys, and flagged sales are excluded from any bearish interpretation. On filing pages the flag is shown next to the transaction so you can see at a glance whether the timing was the insider's choice.

Reading a Form 4 with the plan flag in mind

1. Check the transaction code first. Codes A, M, and F are compensation mechanics regardless of any plan.
2. For a sale (code S), look for the 10b5-1 checkbox and footnotes. A flagged sale is routine portfolio management until proven otherwise.
3. For an unflagged, discretionary sale, look at size relative to the insider's total stake. Trimming 2% of a position is different from liquidating half of it.
4. For a purchase (code P), the flag is rare. An unflagged open-market buy is the strongest starting point for further signal analysis.

A note on purchases

While most 10b5-1 activity is selling, insiders occasionally buy under plans too. A planned buy is weaker than a spontaneous open-market purchase, so we discount it in scoring rather than treating it as a top conviction signal.

Frequently asked questions

Is a 10b5-1 sale bearish?

By itself, no. The insider committed to the schedule months earlier, often as part of routine diversification. The bearish reading only becomes interesting when discretionary, unplanned selling clusters across several insiders at once. See insider selling: signal or noise.

Can an insider cancel a 10b5-1 plan?

Yes. Terminating a plan is not itself a trade, so it does not violate the rule directly. But the 2023 amendments require good faith with respect to the plan, and modifications restart the cooling-off period, so strategic cancellation now carries real legal risk. Plan adoptions and terminations must also be disclosed in the company's quarterly filings.

Does a 10b5-1 plan mean the insider knows nothing?

No. It means the insider certified they held no material non-public information when the plan was adopted. The rule is a defense about timing, not a statement about the insider's overall knowledge of the business.

How does InsiderAlpha detect plan trades?

We read the dedicated Form 4 checkbox introduced with the 2023 reforms and scan footnotes and remarks for plan language. Both paths set the same flag on the stored transaction.

Do companies use 10b5-1 plans too?

Yes. Issuers commonly run stock buyback programs under Rule 10b5-1 plans so repurchases can continue through earnings blackout windows. The same interpretation applies: the schedule was fixed in advance, so an individual repurchase carries no timing information.

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This article is informational and is not investment advice.