10b5-1 Plan: A Post-IPO Sell Strategy for Tech Employees

For tech employees and executives managing a concentrated stock position after IPO, lockup expiration, or a large secondary sale opportunity. Not legal or investment advice — your specific situation requires your own counsel.

What is a 10b5-1 plan?

Rule 10b5-1 of the Securities Exchange Act of 1934 provides an affirmative defense against insider trading liability for securities transactions executed pursuant to a pre-established, written trading plan.¹ In plain language: if you set up a plan when you don't possess material nonpublic information (MNPI), and then execute trades according to that plan, those trades are legally protected even if the company is in a quiet period or you later learn something material.

For a post-IPO tech employee or executive with a large block of company stock, this matters because:

• You're almost always an "insider" for trading purposes — you're exposed to earnings previews, product launches, M&A discussions, or other MNPI routinely.
• Trading windows (the brief open periods after earnings releases) don't give you enough time to systematically reduce a multi-million-dollar concentrated position.
• Selling large blocks ad hoc — even in open windows — creates legal and reputational risk if the timing later looks suspicious.

A 10b5-1 plan solves this by taking you out of the decision loop. You instruct a broker when, at what price, and in what quantities to sell — then the plan executes automatically.

How plans are structured

A valid 10b5-1 plan must specify, at plan adoption:

• The number of shares (or dollar amount) to be sold, OR a formula or algorithm for determining quantity
• The price at which to sell, OR a limit-order formula (e.g., "sell at market" or "sell if price exceeds $X")
• The dates or schedule on which trading will occur

Common structures for tech employees:

1. Fixed-schedule sell-down. "Sell 2,000 shares on the 15th of each month for 24 months." Simple, predictable, easy to explain.
2. Price-triggered tranches. "Sell 10,000 shares if the stock trades at or above $X." More tax-efficient if you want to avoid selling at a low, but structuring price triggers requires care — overly restrictive triggers may mean the plan never executes.
3. Market-order monthly. Most common for executives who want the plan to actually clear: fixed quantity, market order, monthly cadence. This prioritizes execution certainty over price optimization.

The 2022 SEC amendments — what changed

The SEC adopted significant amendments to Rule 10b5-1 in December 2022, effective February 27, 2023.² If you've read older guides, the rules they describe are no longer fully accurate. Key changes:

Cooling-off periods are now mandatory

Under the old rule, you could theoretically adopt a plan on Monday and begin selling on Tuesday. The amendments created mandatory waiting periods before the first trade can execute:

The practical impact: if you're an executive who wants to start selling in Q3, you need to set up your plan by late Q2 (before the Q2 earnings blackout begins), and even then your first trade won't execute until 90–120 days later. The timing window to actually adopt a valid plan is narrower than it looks on a calendar.

Single-trade plan limits

The amendments limit everyone other than the company itself to one single-trade plan per 12-month period. If your strategy is a series of one-off large block sales, you can only structure one of them as a 10b5-1 plan per year. Multiple sales require a multi-trade plan rather than chaining together single-trade plans.

Overlapping plans are prohibited

You generally cannot operate two 10b5-1 plans concurrently. The only narrow exception is a plan designed to satisfy a compensation award under a written plan or arrangement (e.g., a systematic ESPP or RSU sell-to-cover that the company controls). Personal sell-down plans must be singular.

Officer/director certifications

At the time of plan adoption, directors and officers must certify in writing that: (1) they are not aware of MNPI about the company or its securities, and (2) they are adopting the plan in good faith, not as a scheme to evade insider trading rules.

When to set up your plan: the timing problem

The biggest practical challenge is adoption timing. The plan must be adopted during an open trading window, when you're not in possession of MNPI. Given blackout periods around earnings and material announcements, most companies have only a few weeks per quarter when the window is truly open.

The typical annual calendar for a public company insider:

• Q1 close → Q1 earnings: 2–4 week open window before pre-earnings blackout begins
• Q2 close → Q2 earnings: same
• Q3 close → Q3 earnings: same
• Q4 close → year-end earnings: same, often compressed by year-end close activity

Add the 90–120 day cooling-off for officers, and you have a real constraint: if you set up a plan in the Q2 window (July), your first trade executes no earlier than October — which is in or around the Q3 earnings blackout. Careful planning with your plan administrator and general counsel is essential to avoid gap periods where your first authorized sale date falls inside a blackout.

Termination and modification

You can terminate a 10b5-1 plan at any time — but termination carries significant risk. The SEC and plaintiffs' lawyers scrutinize plan terminations, especially when the termination precedes a material announcement. Terminating a plan shortly before a stock decline that would've sold shares at high prices is a red flag, even if the termination was for unrelated reasons.

Modification of a plan is treated like adoption of a new plan — it triggers a new cooling-off period. "Tweaking" a plan to adjust quantities or prices is not a minor administrative act; it restarts the clock.

Interaction with ISO exercise timing

For employees who hold both ISOs (or NQSOs) and vested shares, the 10b5-1 plan typically governs sale of already-exercised shares, not the exercise decision itself. The plan structure does not automatically resolve the AMT tranche question for ISOs — you still need to plan ISO exercises separately, then deploy the resulting shares into a sell-down plan.

The interaction matters because:

• Exercising ISOs this year creates new shares. Those shares can be added to an existing or new 10b5-1 plan, but adding them is a modification that may restart the cooling-off.
• If your plan is selling exercised shares that haven't met the qualifying-disposition holding period, those sales are disqualifying dispositions — ordinary income, not LTCG. The plan won't protect you from the tax consequence of selling too soon.
• Coordinating the exercise tranche schedule with the plan sell schedule — so that your first tranche turns LTCG-eligible before the plan sells it — is one of the high-value things a specialist models.

Common mistakes

• Adopting too close to a material event. If the plan is adopted when you have MNPI (even if you believe it's immaterial), the affirmative defense fails. Courts look at whether, objectively, the information would be material to investors.
• Forgetting the cooling-off period when planning cash flow. Officers often set up a plan expecting to fund a home purchase or tax payment with the proceeds — then discover the first sale won't execute for 90–120 days. Build the cooling-off into your liquidity planning.
• Structuring price floors that are never triggered. A plan that never executes because the stock stays below your limit orders provides no protection — and prevents you from selling via other means because you technically have an active plan.
• Not coordinating with the company's stock administration team. Most companies require pre-approval of 10b5-1 plans. Adopting a plan without notifying stock admin can create compliance complications, even if the plan itself is technically valid.
• Ignoring the state tax dimension. If you're in a state with income tax and plan to move to a lower-tax state, the timing of sales relative to your residency change can shift significant tax liability. This is especially relevant for California to Nevada/Texas/Florida moves — California asserts tax on income that "sourced" in-state, and stock option income may be partially sourced to California regardless of where you live at sale.

State sourcing and residency considerations

California (and a few other high-tax states) applies source-based taxation to certain equity compensation income. If you exercised ISOs or received RSU vests while a California resident, California taxes its portion of the gain even after you move — based on the ratio of California service days to total service days during the relevant period.³

A 10b5-1 plan that sells post-exercise shares does not automatically eliminate this California exposure. The sourcing calculation attaches at exercise (for ISOs) or vest (for RSUs), not at sale. If you're planning to relocate before setting up a sell-down plan, model the sourcing rules before assuming the move eliminates your California tax liability.

When a specialist earns their fee

For stock positions above $1M, the interaction of cooling-off timing, AMT tranche coordination, holding-period optimization, state sourcing, and concentrated-position risk means the plan design problem has real financial stakes — often measured in six figures of tax differential between good and poor execution.

A fee-only advisor specializing in equity compensation brings:

• Multi-year modeling of the exercise-hold-sell sequence across tax years
• Coordination of the 10b5-1 plan schedule with the AMT tranche calendar
• State sourcing analysis for any planned residency changes
• Review of company-specific plan restrictions (some companies have additional requirements beyond SEC minimums)
• Coordination with your tax preparer so the K-1, W-2, and brokerage statements all reconcile correctly at tax time

Generalist advisors typically don't model these interactions at this level of detail — equity comp specialists do it dozens of times a year and spot the edge cases that cost clients money.

Sources

1. 17 CFR § 240.10b5-1 — Trading "on the basis of" material nonpublic information. The rule and its affirmative defense conditions are codified here. Subsection (c)(1) describes the conditions for the plan-based affirmative defense.
2. SEC Release No. 33-11138 — Amendments to Rule 10b5-1 (December 2022, effective February 27, 2023). Cooling-off periods, overlapping plan restrictions, single-trade plan limits, officer certifications, and enhanced quarterly/annual disclosure requirements. Values verified April 2026.
3. California FTB Publication 1005 — Withholding on Stock Options and Other Forms of Equity Compensation. California's source-based taxation of stock option income: the apportionment ratio is calculated based on California workdays during the option's service period, not the employee's state of residence at exercise or sale.
4. SEC Fact Sheet — Rule 10b5-1 Amendments. Plain-English summary of all changes from the 2022 rulemaking: cooling-off periods, plan conditions, disclosure requirements, and issuer repurchase disclosure rules.
5. Candor — Rule 10b5-1 Trading Plans: Guide for Public Company Executives (2025). Practical implementation detail including blackout period interaction, plan termination risk, and common compliance gaps seen in post-amendment plan adoptions.

Regulatory values and requirements verified against SEC Release No. 33-11138 (effective February 27, 2023) and 2025 C&DI updates. Stock sale planning with material nonpublic information exposure requires review by qualified legal counsel.