10b5-1 Plan Setup: SEC Rules and Brokerage Mechanics

What Rule 10b5-1 actually does — and what it does not

Rule 10b5-1 is not a license to trade on inside information. It is an affirmative defense. If the SEC or a private plaintiff alleges you traded while possessing material nonpublic information (MNPI), a properly established 10b5-1 plan lets you argue that the trade was pre-committed before you had the information. The burden shifts: the SEC must show you adopted or modified the plan while possessing MNPI or acted in bad faith.

The rule was adopted in 2000 under Exchange Act Rule 10b5-1(c). For 22 years, it had minimal guardrails — no mandatory cooling-off period, no limits on modifications, no certification requirement. Insiders could adopt a plan on Monday and execute the first trade on Tuesday. The SEC closed these gaps with amendments effective February 27, 2023, which imposed the cooling-off periods, certification requirements, and single-trade plan restrictions described below.

Who needs a 10b5-1 plan

Any person who routinely possesses MNPI about a public company and wants to trade that company’s securities. In practice, this means:

• Section 16 officers and directors. CEO, CFO, CAO, and any officer designated under Exchange Act Section 16. These individuals are subject to the longest cooling-off period (90–120 days) and must provide a written certification at plan adoption.
• Non-Section 16 insiders. VPs, senior engineers, product leads, and others who receive MNPI through their role but are not Section 16 filers. Shorter cooling-off period (30 days), no certification requirement.
• 10% shareholders. Any person who beneficially owns more than 10% of a class of equity securities registered under the Exchange Act.

You do not need a 10b5-1 plan to sell company stock if you are not an insider. Rank-and-file employees who receive RSUs but have no access to MNPI can sell during open trading windows without a plan. The plan is for people whose access to information makes routine trading legally risky.

The 2023 SEC amendments: what changed

The February 2023 amendments rewrote the practical mechanics of 10b5-1 plans. If you are reading pre-2023 guidance from your broker or law firm, much of it is outdated. Here are the four material changes:

1. Mandatory cooling-off periods

The 90-day/filing requirement for Section 16 insiders means the effective cooling-off period depends on your company’s reporting calendar. If you adopt a plan the day after an earnings filing, you wait ~90 days (until just after the next quarterly filing). If you adopt mid-quarter, you could wait up to 120 days.

2. Director and officer certification

At adoption, directors and Section 16 officers must certify in writing that: (1) they are not aware of any MNPI about the company or its securities, and (2) they are adopting the plan in good faith and not as part of a scheme to evade insider-trading prohibitions. This certification is not filed with the SEC but must be retained by the company and can be requested in an investigation.

3. Single-trade plan restrictions

A plan designed to cover a single trade (one purchase or sale) can only be used once in any 12-month period. This prevents the old practice of adopting a one-off plan, executing the trade after a short wait, terminating the plan, adopting a new one-off plan, and repeating. If you need to sell shares regularly, structure the plan as a multi-trade plan with a defined schedule or formula.

4. No overlapping plans

You cannot maintain multiple plans for the same class of securities with overlapping execution periods. The exception: a “later-commencing plan” where the first trade under Plan B does not occur until all trades under Plan A have completed or the plan has expired.

How brokerages implement 10b5-1 plans

The SEC prescribes the legal requirements, but the actual mechanics — how trades execute, how the plan is documented, what you can and cannot customize — are driven by your broker and your company’s insider-trading policy. Here is how the process works at most major brokerages (Schwab, Morgan Stanley at Work, Fidelity, E*TRADE):

1. Pre-clearance from your company. Before approaching a broker, get written pre-clearance from your company’s legal or compliance team. Most companies require this, and many have template plans they require you to use. Some companies restrict which brokers can administer 10b5-1 plans (typically the same broker that holds your equity comp accounts).
2. Plan design with the broker. You specify the parameters: shares to be sold (number or dollar amount), pricing instructions (market order, limit order, VWAP), schedule (monthly, quarterly, upon vesting), and plan duration (typically 6–24 months). The broker’s 10b5-1 desk drafts the plan document.
3. Legal review and execution. Your attorney (or your company’s outside counsel) reviews the plan. You sign. The broker countersigns. The plan is now “adopted.”
4. Cooling-off period. No trades execute during the applicable cooling-off window. The broker’s system is configured to block execution until the window expires.
5. Automated execution. Once the cooling-off period ends, trades execute automatically per the plan’s instructions. You do not initiate, approve, or modify individual trades. The broker reports executions to you, your company, and (for Section 16 filers) files Form 4 noting the trades were made under a 10b5-1 plan.
6. Termination or expiration. The plan ends when all trades complete, the duration expires, or you terminate early. Early termination is permissible but is disclosed on Form 4 and may invite scrutiny if it coincides with subsequent MNPI-driven events.

Worked example: VP at a public tech company selling $2M in vested RSUs

Dana is a VP of Engineering at a publicly traded SaaS company. She is a Section 16 officer. Over three years, she has accumulated 25,000 vested RSU shares with a current market price of $80/share — $2M in company stock. Her total net worth is $3.2M; company stock represents 62.5% of it. She wants to diversify to below 25% employer concentration.

Plan structure

Tax treatment on the RSU sales

Dana’s RSUs vested at various prices over three years. Her cost basis per share (the FMV at each vest date, on which she already paid ordinary income tax) ranges from $55 to $75. If she sells at $80:

• Shares with $55 basis: $25/share gain. Held over 1 year since vest → long-term capital gain at 15% (her taxable income is under $533,400 single). Plus 3.8% NIIT since her MAGI exceeds $200K. Total rate: 18.8%.
• Shares with $75 basis: $5/share gain. Same rate structure — 18.8% on the $5 gain.
• Shares vested within the past 12 months: short-term capital gain, taxed at ordinary income rates (likely 32% or 35% at her income level).

The 10b5-1 plan does not change any of this math. It determines when she sells. The tax outcome depends on her basis, holding period, and income level — all of which exist independently of the plan.

Coordination with other equity compensation

A 10b5-1 plan does not exist in isolation. Most insiders hold multiple forms of equity compensation that interact with the plan:

RSUs vesting during the plan period

New RSU vests during an active 10b5-1 plan are not automatically included in the plan’s sell instructions (unless the plan explicitly covers future vests). Most plans cover only shares you hold at adoption. If you want to sell newly vesting RSUs, you either need a plan that specifies “sell X shares upon each vest date” (which some brokers support) or a separate sell-at-vest standing order outside the 10b5-1 plan — which is only permissible if you are not in possession of MNPI at the time of sale.

ISOs and the qualifying-disposition clock

If your 10b5-1 plan includes shares acquired through ISO exercise, the plan’s execution date determines whether the sale is a qualifying or disqualifying disposition under IRC 422. A qualifying disposition requires holding the shares more than 1 year from exercise and more than 2 years from grant. If the plan sells shares before those thresholds, the sale is a disqualifying disposition — the spread at exercise is reclassified as ordinary income regardless of the 10b5-1 structure. Time your plan’s start date and share selection with the holding-period clocks.

ESPP shares

ESPP shares purchased under IRC 423 have their own qualifying-disposition rules: hold more than 1 year from purchase date and more than 2 years from offering-period start. Selling ESPP shares through a 10b5-1 plan before meeting both thresholds converts the discount to ordinary income (disqualifying disposition). If you are including ESPP shares in your 10b5-1 plan, sort by purchase-date lot and ensure the plan sells the oldest lots first.

Modification and termination: where plans break

The part most people miss: any modification to the amount, price, or timing of trades under a 10b5-1 plan is treated as a termination and re-adoption. The full cooling-off period restarts. If you adopted a plan in March and modify it in July, your first trade under the modified plan cannot execute until October at the earliest (90 days from modification for Section 16 filers).

The SEC has also stated that a pattern of frequent modifications, terminations, and re-adoptions — even if each individual plan technically complies — can negate the affirmative defense. The SEC looks at the totality of conduct. Three plan adoptions in 12 months will likely attract enforcement attention regardless of cooling-off compliance.

Terminating a plan early is permissible but carries reputational and legal risk. If you terminate a plan and the stock price subsequently moves in a direction that would have been unfavorable under the plan, the inference is that you terminated based on MNPI. Companies must disclose 10b5-1 plan adoptions and terminations in their quarterly filings (per the 2023 amendments), so early termination is visible to the market.

The good-faith requirement

The 2023 amendments added an explicit good-faith condition: the plan must not be “part of a plan or scheme to evade the prohibitions of [Rule 10b-5].” This is assessed at adoption and throughout the plan’s life. Behaviors that undermine good faith:

• Adopting a plan while aware of an upcoming material event (even if the formal MNPI definition is debatable).
• Engaging in hedging transactions or trading in derivatives on the same security during the plan period.
• Influencing the timing of company announcements to coincide with plan trades.
• Terminating the plan shortly before a trade that would have been unfavorable.

Good faith is a facts-and-circumstances test. There is no bright-line safe harbor. The strongest defense is a plan adopted during an open trading window, with a long duration (12+ months), no modifications, and trades that execute through both favorable and unfavorable price movements.

Common plan structures

Concentration risk: the reason 10b5-1 plans exist in practice

The legal purpose of a 10b5-1 plan is insider-trading defense. The practical purpose is concentration-risk management. Most insiders who adopt 10b5-1 plans are not trying to front-run earnings — they are trying to get their employer-stock exposure below a reasonable threshold.

The math: an executive earning $400K/year in RSUs who holds for 5 years at a company whose stock doubles accumulates $4M+ in a single stock. Add ISO exercises, ESPP purchases, and 401(k) company stock match, and total employer exposure can exceed 70% of net worth. At that concentration, a 30% stock decline wipes out more than 20% of total net worth — an unrecoverable loss at the wrong point in a career.

A 10b5-1 plan is the mechanism by which insiders execute the “sell RSUs at vest, diversify, re-buy if conviction warrants it” strategy without running afoul of blackout windows and trading restrictions. The plan removes the behavioral friction of selling (“but the stock might go up”) by committing the trade in advance.

Company insider-trading policies: the layer above the SEC

The SEC sets the floor. Your company’s insider-trading policy sets the ceiling — and it is almost always more restrictive. Common company-level restrictions:

• Pre-clearance required before adopting, modifying, or terminating a 10b5-1 plan.
• Mandatory use of the company’s designated broker (often Morgan Stanley at Work, Schwab, or E*TRADE for equity comp accounts).
• Plan adoption only during open trading windows (typically 2–4 weeks after earnings release).
• Minimum plan duration (6 or 12 months).
• Company counsel review of the plan document before execution.
• Prohibition on multiple plans, even where the SEC would allow a later-commencing plan.

Violating company policy may not trigger SEC liability, but it can trigger termination for cause, clawback of equity compensation, and loss of the affirmative defense if the SEC later investigates. Read your company’s policy before contacting a broker.

Key takeaways

• A Rule 10b5-1 plan provides an affirmative defense against insider-trading liability for pre-arranged trades adopted when you do not possess material nonpublic information. It is not automatic protection — the plan must be adopted in good faith and comply with the 2023 SEC amendments.
• Section 16 officers and directors face a cooling-off period of 90–120 days (the later of 90 days or the next 10-Q/10-K filing). Non-Section 16 insiders wait 30 days. No trades can execute during the cooling-off window.
• Any modification to trade amount, price, or timing resets the cooling-off period as if the plan were newly adopted. A pattern of frequent modifications can negate the affirmative defense entirely.
• Single-trade plans are limited to one per 12-month period. For ongoing diversification, use a multi-trade plan with a fixed schedule or formula.
• The plan does not change your tax treatment. RSU sales remain ordinary income at vest + capital gain/loss on appreciation. ISO sales through a plan still follow qualifying vs. disqualifying disposition rules under IRC 422. ESPP sales still follow IRC 423 holding periods.
• Your company’s insider-trading policy is almost always more restrictive than the SEC rules. Get pre-clearance, use the designated broker, and adopt plans only during open trading windows.
• The practical driver for most 10b5-1 plans is concentration-risk reduction. If employer stock exceeds 20–25% of net worth, the diversification math favors systematic selling regardless of your view on the stock — and a 10b5-1 plan is the legally safe way to execute it as an insider.