10b5-1 Plans Explained: Pre-Programmed Insider Trading

What Is a 10b5-1 Plan?

A 10b5-1 plan is a written plan for trading securities that a corporate insider establishes while they are not in possession of material nonpublic information (MNPI). Once the plan is in place, trades execute according to a predetermined schedule, formula, or set of instructions — regardless of any information the insider may acquire after the plan's adoption.

The rule derives its name from SEC Rule 10b5-1, which was adopted by the Securities and Exchange Commission in October 2000. The rule's purpose was to clarify when insider trades violate Rule 10b-5 (the SEC's general anti-fraud rule) and to provide a safe harbor for insiders who want to trade their company's stock without the constant risk of being accused of insider trading.

Before Rule 10b5-1, insiders faced a difficult dilemma. As officers and directors of public companies, they almost always possessed some degree of knowledge that could be characterized as material nonpublic information. This made every trade potentially suspicious. Rule 10b5-1 solved this problem by creating an affirmative defense: if the insider can demonstrate that their trade was made pursuant to a pre-existing plan adopted while they were not aware of MNPI, the trade is presumed lawful.

How 10b5-1 Plans Work

The mechanics of a 10b5-1 plan are straightforward in concept but complex in practice. Here is the basic structure:

Plan Adoption

The insider works with their broker or financial advisor to create a written trading plan. The plan specifies one of three mechanisms for determining when and how trades will execute:

1. Specific dates and amounts: The plan states that the insider will sell (or buy) a specific number of shares on specific dates. For example: "Sell 10,000 shares on the first business day of each month for the next 12 months."
2. Formula-based: The plan specifies a formula that determines when trades occur. For example: "Sell 5,000 shares whenever the stock price exceeds $150 per share."
3. Delegated authority: The insider gives a third party (typically their broker) discretion to execute trades on their behalf, subject to certain parameters. The insider cannot influence the third party's decisions after the plan is adopted.

At the time of adoption, the insider must certify that they are not in possession of material nonpublic information. This certification requirement was significantly strengthened by the 2023 amendments, as we will discuss below.

Cooling-Off Period

After the plan is adopted, there is a mandatory waiting period before the first trade can execute. Under the original 2000 rule, there was no required cooling-off period, which was widely criticized. The 2023 amendments introduced mandatory cooling-off periods, which we will cover in detail.

Plan Execution

Once the cooling-off period expires, trades execute automatically according to the plan's terms. The insider does not make any decisions about individual trades — they happen on autopilot. The insider cannot modify or terminate the plan based on subsequent information they acquire about the company.

Plan Termination

An insider can terminate a 10b5-1 plan at any time. However, frequent adoption and termination of plans can undermine the affirmative defense, as it suggests the insider is using plans strategically rather than as a genuine pre-commitment mechanism. The 2023 amendments addressed this concern directly.

Why 10b5-1 Plans Exist

Corporate insiders face a genuine problem: they need to be able to sell stock, but they almost always possess some degree of inside knowledge. Without 10b5-1 plans, insiders would face one of two unattractive options:

• Never sell: Hold all their stock indefinitely, creating massive concentration risk in a single security. This is impractical and financially irresponsible, especially for executives whose compensation is heavily weighted toward equity.
• Sell and risk prosecution: Sell stock and hope that the SEC does not interpret the trade as based on inside information. This creates legal uncertainty that discourages insiders from diversifying their portfolios.

10b5-1 plans provide a middle ground. Insiders can sell stock on a regular schedule, diversifying their holdings over time, while maintaining a legal defense against insider trading allegations. This is a legitimate and important function.

The problem, as academic research revealed, is that the original rule was too permissive and allowed strategic manipulation.

Academic Criticism: Jagolinzer, Larcker & Taylor (2011)

The most influential academic critique of 10b5-1 plans came from Alan Jagolinzer, David Larcker, and Daniel Taylor in their 2011 paper "Corporate Governance and the Information Content of Insider Trades," published in The Journal of Accounting Research. A closely related study by Jagolinzer, published in The Accounting Review in the same period, focused specifically on 10b5-1 plan trading patterns and found troubling results.

Jagolinzer obtained data on 10b5-1 plan adoptions, modifications, and terminations from a large broker that administered these plans. His analysis revealed several patterns that were difficult to reconcile with the plans' stated purpose as a pre-commitment device:

Suspiciously Good Timing

Trades executed under 10b5-1 plans performed significantly better than would be expected from a random or mechanical trading schedule. Specifically, sales under 10b5-1 plans tended to occur before negative price movements, and purchases tended to occur before positive price movements. The plans appeared to be timed to take advantage of information the insider possessed at the time of plan adoption.

Strategic Plan Termination

Insiders frequently terminated 10b5-1 plans early, and the timing of these terminations was suspicious. Plans were often terminated before scheduled sales that would have occurred at unfavorable prices. This pattern suggested that insiders were using plan termination as a way to avoid selling before good news or to stop selling before the stock rose.

Multiple and Overlapping Plans

Some insiders maintained multiple 10b5-1 plans simultaneously, adopting new plans while existing plans were still active. This allowed for complex layering strategies that undermined the pre-commitment rationale of the rule.

These findings, combined with investigative journalism and Congressional attention, created momentum for regulatory reform that eventually culminated in the 2023 SEC amendments.

The 2023 SEC Amendments

On December 14, 2022, the SEC adopted comprehensive amendments to Rule 10b5-1 that took effect on February 27, 2023. These amendments represented the most significant overhaul of the rule since its original adoption in 2000. The changes directly addressed the abuses documented in academic research and enforcement actions.

The 90-Day Cooling-Off Period

The most impactful change was the introduction of a mandatory 90-day cooling-off period for officers and directors. Under the original rule, there was no required cooling-off period at all, meaning an insider could adopt a plan and have the first trade execute the very next day. This made it easy to adopt a plan based on current inside information and have trades execute before that information became public.

The 90-day cooling-off period (or until the next quarterly earnings release, whichever is later) ensures that at least one full earnings cycle passes before the first trade executes. This dramatically reduces the ability to time plan adoption around short-term inside information, because any material information the insider possesses at adoption will likely have been disclosed publicly through the earnings report before the first trade occurs.

For insiders who are not officers or directors, the cooling-off period is 30 days.

Prohibition on Overlapping Plans

The prohibition on overlapping plans closes the layering loophole that Jagolinzer's research documented. Under the original rule, an insider could maintain multiple plans simultaneously, creating a complex web of scheduled trades that could be selectively terminated. Under the amended rule, an insider can only have one 10b5-1 plan for open-market trading in the same class of securities at a time.

Single-Trade Plan Limitation

The one-single-trade-plan-per-12-months limitation addresses a specific abuse: insiders who adopted 10b5-1 plans designed to execute a single large trade and then quickly terminated the plan after that trade was complete. By limiting single-trade plans to one per year, the amendment discourages the use of 10b5-1 plans as a mechanism for making one-off trades under the cover of a "plan."

Good Faith Certification

Officers and directors must now certify, at the time of plan adoption, that:

1. They are not aware of any material nonpublic information about the company or its securities.
2. The plan is being adopted in good faith and not as part of a plan or scheme to evade the prohibitions of Rule 10b-5.

This certification requirement goes beyond the original rule's requirement that the insider simply not be "aware" of MNPI. The good faith certification creates an additional legal obligation that can serve as the basis for enforcement action if the SEC later determines that the insider was, in fact, gaming the system.

Timeline of 10b5-1 Regulation

How 10b5-1 Plans Appear on Form 4

When an insider executes a trade under a 10b5-1 plan, they are still required to file a Form 4 with the SEC within two business days. The Form 4 includes a footnote indicating that the trade was made pursuant to a pre-existing 10b5-1 plan. The footnote typically states something like: "This transaction was executed pursuant to a Rule 10b5-1 trading plan adopted on [date]."

This disclosure is important for investors analyzing insider trading data. Trades made under 10b5-1 plans should be treated differently from discretionary trades for signal generation purposes, because the two types of trades have fundamentally different informational content.

Why 10b5-1 Sales Are Less Informative

For investors who use insider trading data as an investment signal, the key implication of 10b5-1 plans is that they significantly reduce the informational content of insider sales. Here is why:

Pre-Programmed vs. Discretionary

A 10b5-1 plan sale is, by definition, a trade that was decided in advance and executes on autopilot. The insider made the decision to sell weeks or months ago, under different market conditions and with different information. The trade does not reflect the insider's current view of the company's prospects.

A discretionary sale, by contrast, is a deliberate decision made by the insider at a specific point in time. If a CEO who does not have a 10b5-1 plan suddenly sells $5 million worth of stock, that is a real-time signal about the insider's current assessment. If the same sale happens under a 10b5-1 plan that was adopted six months ago, it tells you very little about what the CEO thinks today.

The Asymmetry Between Purchases and Sales

This distinction intersects with a fundamental asymmetry in insider trading analysis: purchases are almost always more informative than sales.

Insiders sell for many reasons unrelated to their company's prospects:

• Diversification: Reducing concentration in a single stock
• Liquidity: Funding a home purchase, education expenses, or other personal needs
• Tax planning: Selling to cover tax liabilities from option exercises or RSU vesting
• Estate planning: Adjusting holdings as part of wealth transfer strategies
• Compensation structure: Many executives receive the majority of their compensation in equity, and selling is simply how they convert compensation to cash

Purchases, on the other hand, are almost always a deliberate investment decision. When an insider buys stock on the open market, they are choosing to increase their exposure to a security they already know intimately. There is no compensation-related reason to buy; the insider is spending their own money because they believe the stock is undervalued.

The combination of these two factors — 10b5-1 plans making sales pre-programmed, and the inherent asymmetry between purchase and sale motivations — means that 10b5-1 plan sales carry very little informational value for signal generation.

The Practical Filter

For quantitative insider trading systems, the practical implication is clear: when scoring insider transactions, 10b5-1 plan sales should be either excluded entirely or heavily downweighted. The focus for signal generation should be on:

1. Open-market purchases (transaction code P) that are not part of a 10b5-1 plan — these are the highest-information trades
2. Discretionary sales (not under a 10b5-1 plan) — these carry some information, particularly when the dollar amounts are large
3. 10b5-1 plan sales — these carry minimal information and can generally be ignored for signal purposes

Post-Amendment Landscape

The 2023 amendments have meaningfully improved the integrity of 10b5-1 plans, but the rule remains imperfect. Several areas of concern persist:

Plan Modification as a Loophole

While the amendments impose restrictions on new plan adoptions, the rules around plan modification are less clear. An insider could potentially modify the terms of an existing plan (changing the number of shares, timing, or price triggers) in ways that effectively create a new plan without triggering the cooling-off period for a new adoption. The SEC has signaled that it views aggressive plan modifications as inconsistent with the good faith requirement, but this area remains a gray zone.

The Information Gradient

The 90-day cooling-off period addresses short-term information asymmetry, but corporate insiders often possess long-term strategic information that will not be reflected in any single earnings report. A CEO who knows that a major product line is failing, that a key customer is leaving, or that a transformational acquisition is being negotiated possesses information with a time horizon that extends well beyond 90 days. The cooling-off period mitigates but does not eliminate this fundamental information advantage.

Voluntary Disclosure

While the amendments require companies to disclose plan adoptions and terminations in quarterly filings (10-Q and 10-K), the disclosures are not always timely or detailed. An insider might adopt a plan in January, but the disclosure might not appear until the 10-Q is filed in May. This creates an information gap that sophisticated market participants may be able to exploit.

What This Means for Investors

Understanding 10b5-1 plans is essential for any investor who uses insider trading data as an input to their investment process. The key takeaways are:

Discount 10b5-1 plan sales. When you see a large insider sale and the footnote says it was made pursuant to a 10b5-1 plan, do not panic. The insider made that decision months ago. It does not reflect their current view.

Focus on discretionary purchases. Open-market purchases that are not part of a 10b5-1 plan are the most informative insider transactions. These are real-time decisions made with the insider's own money.

Watch for plan adoptions. Under the 2023 amendments, companies must disclose when insiders adopt new 10b5-1 plans. A new plan adoption by a CEO, particularly a sell plan, may signal that the insider expects the stock's near-term performance to be weaker. However, this signal is noisy because plan adoptions are also motivated by legitimate diversification and tax planning needs.

Cluster buying remains the gold standard. Because 10b5-1 plans are almost exclusively used for sales (insiders rarely set up pre-programmed purchase plans), cluster buying signals are largely unaffected by 10b5-1 considerations. When multiple insiders make discretionary purchases within a short window, that signal retains its full informational value regardless of the 10b5-1 landscape.

The 2023 amendments have made the 10b5-1 framework more robust, but they reinforce a principle that academic research has consistently supported: for investors seeking alpha from insider trading data, discretionary purchases are where the signal lives. Pre-programmed sales, while an important part of the regulatory framework, are noise rather than signal.