What 10b5-1 Trading Plan Mistakes Are Costing You Money?
Last reviewed: September 2026
The costliest 10b5-1 trading plan mistakes are a price limit or fixed schedule chosen by default instead of on purpose, a single trigger that never accounts for vesting or taxes, and a plan nobody reviews after the stock moves. None of these keep the plan from existing on paper; they just let it quietly cost money while it runs. A plan adopted at $40 a share and never revisited after the stock triples is still technically valid. It's still quietly costing money.
Key Takeaways
- Under SEC rules, officers and directors face a mandatory 90-day cooling-off period before a new 10b5-1 trading plan's first trade can execute.
- Other insiders and the issuer face a shorter mandatory 30-day cooling-off period under that same SEC rule.
- A 10b5-1 trading plan's price-limit or fixed-schedule structure, not its mere existence, decides whether it actually manages concentration risk.
- Reviewing a 10b5-1 trading plan after every major vest or stock move keeps it from quietly generating tax-inefficient sales.
About the Author: Jeff Judge, CFP®, AEP®, ChFC®, CLU® is Managing Partner of Chesapeake Financial Planners in Forest Hill, Maryland. He has been helping tech and SaaS employees across Harford County and the Baltimore metro area design trading plans around concentrated company stock since earning his CFP® certification in 2013, using Chesapeake's signature process, the R.U.D.D.E.R. Method™. "A 10b5-1 trading plan is the easiest financial decision in the world to set once and never touch again, and that's exactly why it needs a second look every time your stock moves," Jeff says.
What Does a 10b5-1 Trading Plan Actually Do?
A 10b5-1 trading plan is a pre-set schedule of instructions to buy or sell company stock, adopted while you do not possess material nonpublic information, that gives you an affirmative defense against insider trading claims if the stock happens to move on news after your trades execute. That legal function is the entire reason most employees think of the plan as paperwork rather than a piece of their financial strategy.
The SEC tightened these rules in 2022: a newly adopted plan now requires a mandatory cooling-off period before the first trade, 90 days for officers and directors and 30 days for other insiders and the issuer. Single-trade and overlapping plans both face new restrictions, because plans were being used to sidestep the very protections they were built to provide. The SEC's investor education page on Rule 10b5-1 walks through the mechanics in plain language.
Does a 10b5-1 trading plan eliminate insider trading risk automatically? No. A 10b5-1 trading plan does not eliminate insider trading exposure on its own; it creates an affirmative defense only when the plan is adopted in good faith, while you don't possess material nonpublic information, and followed exactly as written. Deviating from the plan, or adopting it in the middle of a blackout window, can undermine that defense entirely.
Should Your 10b5-1 Trading Plan Use a Price Limit or a Fixed Schedule?
When you set up the plan, you choose whether trades execute on a fixed calendar schedule regardless of price, or only when the stock crosses a price limit you set in advance. Most people default to whatever their brokerage's template offers, because nobody walks them through what the choice means for their concentration risk.
| Structure | How It Works | Best Fit | Tradeoff |
|---|---|---|---|
| Fixed schedule (no price limit) | Sells a set number of shares on the same dates every quarter | Investors who want disciplined, unemotional diversification | Can sell during a random dip unrelated to company fundamentals |
| Price-limit plan | Trades execute only when the stock crosses a preset price | Investors who want more control over the price they sell at | Shares may never sell if the limit is never reached |
A fixed schedule fits an employee who would rather not think about timing at all, but it's a worse fit once a meaningful share of net worth sits in one company's stock and a third of the annual vest could sell during a random dip. A price-limit structure trades that risk for another: if the stock never crosses the limit, the shares don't sell, and the plan technically exists but manages nothing.
Does a Single Trigger Design Serve You Better Than Multiple Triggers?
Most 10b5-1 trading plans are built around one simple trigger: sell X shares on the same date every month or quarter. That's easy to set up and easy to forget about, which is exactly the problem.
A better-designed plan ties triggers to events that actually matter to the employee's finances, not to a random date on a template:
- Vesting dates. Selling shares immediately at vest avoids a second layer of capital gains exposure on stock that already generated ordinary income the moment it vested.
- Tax-bracket thresholds. Structuring sales around them keeps the plan from pushing a bad income year into a worse one.
- Target allocation bands. Sales trigger only once company stock exceeds a set percentage of total net worth, which manages concentration risk far more directly than a calendar date.
Jeff Judge has reviewed dozens of 10b5-1 trading plans for tech and SaaS clients, and the plans that hold up tie their triggers to vesting dates and allocation bands rather than a date picked at random. None of this is complicated once someone explains it; it's just rarely explained, because the plan gets filed away as a compliance document instead of treated as the financial decision it is.
How Often Should a 10b5-1 Trading Plan Be Reviewed?
Here's the scenario that shows up most often. An employee adopts a plan two or three years into vesting, stock at $40, price limit set around $55. Eighteen months later the stock is at $110 and the plan is still running that same band, because nobody told the employee a 10b5-1 trading plan is a standing instruction, not a one-time decision. They're either selling far below where they could be, or trades are executing constantly and generating an unplanned tax bill.
Reviewing on a set cadence is the same discipline behind Chesapeake's R.U.D.D.E.R. Method™: Review and Recognize, Uncover and Understand, Design and Develop, Discuss and Decide, Execute and Empower, and Reassess and Refine. Applied here, that means pulling the documents out at every major vest and every significant stock move, not leaving the same band in place for years.
Maryland adds a layer national coverage of 10b5-1 trading plans skips. The Comptroller of Maryland taxes capital gains, including gains from a 10b5-1 trading plan's sales, as ordinary income under the state's graduated rates rather than a separate, lower capital gains rate, and every county layers its own local piggyback tax on top. A sale scheduled through a stale price band doesn't just risk the wrong price; it can land in a tax year where the combined state and county bite is worse than planned.
That's the layer we see most with Baltimore-metro and Harford County clients holding public-company equity: commuters into Baltimore City, employees working remote for a company based outside Maryland, and Aberdeen-area contractors who also carry equity from a prior tech employer. If your plan hasn't been reviewed since it was adopted, or you're unsure how Maryland's ordinary-income treatment of stock gains interacts with its trigger design, that's worth a fit call.
Does moving out of Maryland change how a 10b5-1 trading plan should be reviewed? The federal cooling-off rules stay the same regardless of state. The tax side changes meaningfully: Maryland's ordinary-income treatment of capital gains and the county piggyback tax disappear if you relocate to a state with no income tax, which can shift the ideal timing of sales scheduled through the plan.
Whichever side of that line you're on, the review conversation is the same: pull up the documents, compare the price band to today's price, and decide, on purpose, whether the structure and the tax picture still fit your life. For a deeper look at diversifying deliberately instead of letting a plan run on inertia, see Concentrated Stock Positions: How to Diversify Company Stock Without a Huge Tax Bill and Is Your Employer Stock a Retirement Plan? The Concentrated Stock Risk Most Employees Miss.
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Who Needs to Take 10b5-1 Trading Plan Design Seriously?
Do rank-and-file employees need the same level of scrutiny as executives? Not usually. A rank-and-file employee with modest equity and no material nonpublic information exposure can typically use a simple plan reviewed annually, while someone in an MNPI-exposed role, or whose equity represents a large share of net worth, needs tighter design and more frequent review.
The stakes rise fast for employees who regularly see material nonpublic information, whose equity is a large share of net worth, or whose company has long blackout windows that make ad hoc selling impractical. For that group the plan is often the only mechanism for selling stock on a predictable schedule at all, which makes the design a bigger deal, not a smaller one. If you're also weighing when to exercise or sell alongside vesting income, RSUs Explained: Why Your 22% Withholding Isn't Enough covers that side of the decision.
Frequently Asked Questions
What is a 10b5-1 trading plan?
A 10b5-1 trading plan is a pre-set, written schedule of instructions to buy or sell company stock, adopted while the employee does not possess material nonpublic information, that provides an affirmative defense against insider trading claims if the stock later moves on news. The plan must be adopted in good faith and followed exactly as written to preserve that protection.
How long is the cooling-off period before a new 10b5-1 trading plan's first trade?
Under the SEC's 2022 amendments, officers and directors face a mandatory 90-day cooling-off period, and other insiders and the issuer face a 30-day cooling-off period, before the plan's first trade can execute. The exact terms still depend on the employer's own plan documentation.
Can I modify a 10b5-1 trading plan once it's adopted?
Modifying an existing plan is treated similarly to terminating it and adopting a new one, which restarts the applicable cooling-off period and can raise questions about good-faith adoption if done while in possession of material nonpublic information. Most employees are better served planning the structure carefully up front rather than modifying frequently.
What happens if a 10b5-1 trading plan's price limit is never reached?
If the stock never crosses the price limit set in the plan, no trades execute, and the employee remains fully concentrated in company stock with a plan that exists on paper but manages no actual risk. This is one of the most common design mistakes in price-limit plans that go unreviewed for a year or more.
Do I need a 10b5-1 trading plan if I'm not an executive?
Not always. A rank-and-file employee with modest equity and no material nonpublic information exposure can often diversify through simpler means, but employees with significant equity concentration, blackout restrictions, or MNPI exposure benefit from a formal, well-designed plan regardless of title.
How often should I review my 10b5-1 trading plan?
Review the plan every time you'd naturally review any other part of your financial life: after a major vest, after a significant move in the stock price, and after a life event that changes how much concentration risk makes sense to carry. Most employees never do this, not because it's difficult, but because nobody told them it was necessary.
What Should You Do Next With Your 10b5-1 Trading Plan?
If you can't say off the top of your head whether your plan uses a price limit, when it was last reviewed, or how Maryland's tax treatment factors into its trigger design, that's the sign to look now, before your next vesting date. Jeff Judge and the Chesapeake team serve tech and SaaS employees, business owners, and families across Harford County and the Baltimore metro. Schedule a free fit call at chesapeakefp.com.
A version of this article was originally published on Jeff Judge's LinkedIn.
Disclosures
The information provided is for educational purposes only and should not be construed as investment advice. Investment strategies should be tailored to individual circumstances, risk tolerance, and goals. Past performance doesn't guarantee future results. Consult with qualified financial professionals regarding your specific situation.
Advisors associated with Chesapeake Financial Planners may be either (1) LPL Financial Registered Representatives offering securities through LPL Financial, Member FINRA and SIPC, and investment advisor representatives offering investment advice through Great Valley Advisor Group; or (2) solely investment advisor representatives offering investment advice through Great Valley Advisor Group and not affiliated with LPL Financial. Great Valley Advisor Group, and Chesapeake Financial Planners are separate entities from LPL Financial.
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