Cooling-Off Period for Rule 10b5-1 Plan Amendments

In August 2023, the SEC overhauled Rule 10b5-1, the safe harbor that lets corporate insiders execute pre-planned trading strategies without insider trading liability. The most visible change: directors and officers can no longer adopt or amend a Rule 10b5-1 trading plan and start trading the same day. They must now wait—a cooling-off period that ranges from 30 to 90 days, depending on role and whether the plan is new or modified. The rule is designed to discourage insiders from timing plan adoption to known adverse information or to appear to be trading away from imminent news.

The Rule 10b5-1 Safe Harbor: Historical Context

Rule 10b5-1, enacted in 2000, created a safe harbor for insiders to buy or sell their company’s stock without risking insider trading prosecution. The mechanism works like this: An insider adopts a written plan that specifies the shares to trade, the price, and the timing (e.g., “sell 10,000 shares on the 15th of each month”). Once the plan is in place and a waiting period has elapsed, the insider can execute the plan even if they later learn material nonpublic information (MNPI)—because the trades were predetermined.

The rule’s purpose is to allow long-term capital planning. An executive shouldn’t be prohibited from diversifying their portfolio just because they work for the company. A pre-planned, disclosed trading schedule is transparent and reduces conflicts of interest.

However, the old rule had a loophole: An insider could adopt a plan on Monday and start trading on Tuesday. If the insider knew bad news was coming on Wednesday, they could front-run the disclosure by executing the plan before the public knew what happened. The cooling-off period closes that gap.

The 2023 Amendment: What Changed

In August 2023, the SEC finalized amendments to Rule 10b5-1 that added mandatory cooling-off periods for new plans and plan modifications. The new rule took effect for new plans in February 2023 and for amendments in August 2024.

For new plans:

• CEOs and CFOs: 90-day cooling-off period before any trades under the plan.
• Other directors and officers: 30-day cooling-off period.
• Non-officer, non-director beneficial owners (e.g., large shareholders): No cooling-off period required; old rules apply.

For modifications (e.g., adding or removing trading instructions):

• All insiders: 30-day cooling-off period, regardless of role.

Exception: An insider can begin trading before the cooling-off period expires if:

1. The adoption or modification of the plan is disclosed via real-time Form 8-K filing.
2. The disclosure occurs before or contemporaneously with the first trade.

In other words, if an insider files an 8-K announcing “I adopted a 10b5-1 plan today,” and the market reacts, the insider can trade immediately because the plan is already public knowledge.

Why the SEC Imposed the Cooling-Off Period

Addressing perceived timing abuse: The SEC’s 2023 proposing release cited instances where insiders adopted plans just before announcing bad news or issuing disappointing guidance. The timing looked suspicious—as if the insider had front-run the market.

Discouraging insider-favorable plan design: Under the old rules, an insider could wait until the day before anticipated bad news, adopt a 10b5-1 plan authorizing large sales, and execute immediately. The cooling-off period prevents this by adding a forced delay.

Reducing litigation risk: The SEC also wanted to reduce shareholder litigation over suspicious insider trading. If a plan sits idle for 30–90 days before trading begins, it looks less like opportunistic timing and more like a genuine long-term strategy.

Harmonizing with common practice: Many institutional investors and some companies had already adopted voluntary cooling-off periods. The SEC rule harmonizes this across all public companies.

How Insiders Disclose 10b5-1 Plans

Insiders report their 10b5-1 plans on Form 4, the insider trading form filed with the SEC. Form 4 is filed within two business days of the plan adoption. The form discloses the plan terms (e.g., “Sell up to 10,000 shares at prices between $50 and $60 over the next 12 months”).

The form is public, so investors and competitors can see that an insider has adopted a trading plan. This transparency is part of why the SEC believes cooling-off periods are warranted—the plan is already disclosed, so the insider has no advantage from timing.

Practical Implications for Insiders

Planning ahead: A CEO who wants to sell shares in Q2 must adopt the plan in Q1 at the latest, accounting for the 90-day wait. This requires discipline and forward planning, which is the point—it discourages reactive, opportunistic trading.

Disclosure timing: The Form 4 filing is public and filed within two business days. Sophisticated investors monitor insider filings. If an insider adopts a large plan, it signals confidence or, conversely, a desire to reduce exposure. The delay before trading begins gives the market time to digest the signal.

Plan modifications: If an insider wants to add or change a plan (e.g., increase the number of shares to be sold), the modification triggers a new 30-day cooling-off. This discourages mid-course corrections timed to adverse information.

Overlapping plans: An insider can have multiple active 10b5-1 plans simultaneously, as long as each plan complies with Rule 10b5-1’s requirements. A new plan doesn’t invalidate an old one, so an insider might stagger plan adoptions to smooth out the cooling-off period.

The Form 8-K Exception

The real-time disclosure exception is important. If an insider adopts a plan and immediately files an 8-K (a current report of material events), they can trade at once because the plan is public. But few insiders do this, because filing an 8-K signals something significant and draws attention.

More commonly, insiders wait out the cooling-off period. The 30–90 day wait is not unreasonable for most trading strategies, and the wait avoids the spotlight of a Form 8-K.

Distinguishing from Form 144

Form 144 is filed by insiders when they sell restricted or Control stock. Rule 10b5-1 is a safe harbor from insider trading liability. The two rules overlap but are separate:

• Form 144: A filing requirement for insiders selling more than a threshold amount of shares. It discloses the sale prospectively.
• Rule 10b5-1: A defense against insider trading charges. It says, “I pre-planned this trade, so even if I later learned MNPI, I’m not liable.”

An insider might file Form 144 and also adopt a 10b5-1 plan, or neither. They’re independent concepts.

Non-Director, Non-Officer Insiders

Beneficial owners who own 10% or more of a company’s stock but are not directors or officers are exempt from the cooling-off period. They can adopt a 10b5-1 plan and trade immediately.

This reflects the SEC’s focus on officers and directors, who are assumed to have the best information and the most temptation to time their trades around corporate events. A large shareholder without board access may have less MNPI, so the SEC applied lighter restrictions.

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