What Is a 10b5-1 Plan? Scheduled Insider Sales Explained

The Problem It Solves

Corporate insiders face a genuine dilemma. Much of their net worth is tied up in company stock, and they have legitimate reasons to sell — diversifying, buying a home, paying taxes, funding retirement. But insiders almost always possess some degree of non-public information about their company. How can they ever sell without the appearance — or reality — of trading on that information?

The SEC's answer, adopted in 2000, is Rule 10b5-1. It provides an affirmative defense against insider-trading liability, so long as the trade was set in motion before the insider had any material non-public information.

How a 10b5-1 Plan Works

The core idea is simple: decide now, trade later. An insider adopts a written plan at a time when they are not aware of any material non-public information. That plan must either:

• specify the exact amount, price, and date of the trades in advance; or
• provide a written formula or algorithm for determining those variables; or
• delegate trading discretion to a broker who cannot themselves possess MNPI.

Once the plan is in place, the insider is not permitted to exercise any subsequent influence over how, when, or whether the trades happen. A broker then executes the sales automatically on the scheduled dates — even if the stock has since risen or fallen, and even if the insider has since learned something material.

The 2023 Reforms — Cooling-Off Periods and More

For years, critics argued the rule was too easy to abuse: insiders could adopt, cancel, and overlap plans opportunistically. In late 2022 the SEC adopted amendments — effective in early 2023 — that tightened the rules considerably:

• Cooling-off periods — directors and officers must wait roughly 90 days (or two business days after the next quarterly results, whichever is later, capped at 120 days) between adopting a plan and the first trade.
• No overlapping plans — insiders generally can't run multiple concurrent single-trade plans to cherry-pick outcomes.
• Good-faith certification — insiders must certify they aren't aware of MNPI when adopting the plan.
• Public disclosure — companies now disclose the adoption and termination of plans, and Form 4 and Form 5 include a checkbox indicating whether a reported trade was made under a 10b5-1 plan.

Why This Changes How You Read a Form 4

This is the practical payoff. A sale executed under a 10b5-1 plan was decided months ago, on a schedule, with no connection to today's news. It carries far less informational signal than a discretionary, opportunistic sale. When an insider sells on a pre-set date under a plan, it usually says nothing about their current view of the company.

Thanks to the new checkbox, many Form 4 filings now flag 10b5-1 transactions explicitly. When you're evaluating an insider sale, that flag is one of the first things to check — it can be the difference between "routine, ignore" and "discretionary, worth a second look."

A Note on Buys vs. Sells

10b5-1 plans are used overwhelmingly for selling. Insider purchases, especially open-market buys, are rarely made under such plans and tend to reflect genuine, current conviction. That asymmetry is a big part of why insider buying is generally a stronger signal than selling. A scheduled sale is noise; a voluntary open-market purchase is a decision the insider chose to make today.