Quick answer
What is the Section 16(b) short-swing profit rule?
Section 16(b) requires directors, officers and owners of more than 10% of a registered class of equity to return to the company any profit from a matched purchase and sale within less than six months. It is strict liability: intent and inside information do not matter, and shareholders can sue to enforce it.
Key takeaways
- 01Any purchase and sale within less than six months can be matched, in either order.
- 02Profit uses lowest-in, highest-out matching, so you can owe money while losing overall.
- 03File Form 4 within two business days of most transactions.
- 04Derivatives and group ownership can create accidental liability.
| Who | Directors, Section 16 officers, over-10% holders |
|---|---|
| Window | Less than 6 months |
| Matching | Lowest price in, highest price out |
| Intent required | No (strict liability) |
| Form 4 deadline | 2 business days |
| Enforcement | Company or shareholder suit |
The Basics
What is the Section 16(b) short-swing rule?
Section 16(b) of the Securities Exchange Act requires directors, officers and beneficial owners of more than 10% of a class of registered equity to pay the company any profit from a purchase and a sale (or a sale and a purchase) within any period of less than six months. It applies regardless of intent or MNPI, and shareholders can sue to enforce it.
This sits within our Executive Concentrated Stock & Insider Selling Guide. Section 16(a) is the reporting half: Form 3 within 10 days of becoming an insider, Form 4 within two business days of most changes, and Form 5 within 45 days of fiscal year-end.
"16(b) does not ask whether you knew anything. It asks only whether a purchase and a sale fall within six months."
The Matching Math
How is short-swing profit calculated?
Courts use the lowest-in, highest-out method. Match the lowest-priced purchase with the highest-priced sale within any six-month window, then the next lowest with the next highest, and so on. Losing pairs are ignored. The result can exceed your actual net profit, and it can produce liability even when you lost money overall.
Buy 1,000 @ $50 · Sell 1,000 @ $40 · Buy 1,000 @ $30 · Sell 1,000 @ $45
16(b) recoverable
$15,000
Lowest-in $30 vs highest-out $45
($45 − $30) × 1,000 = $15,000. The remaining pair ($50 buy vs $40 sale) is a loss and is ignored, not netted.
Actual economic profit
$5,000
Net of all four trades
−$10,000 on the first round trip plus +$15,000 on the second = $5,000.
Why it bites: Four trades within six months. The insider made $5K net, but 16(b) recovers $15K, because the losing pair is disregarded.
Chart
Actual profit vs 16(b) disgorgement
Estimate It
How much could you owe?
Calculator
Short-swing disgorgement estimate (one matched pair)
Enter matched shares, the highest sale price and the lowest purchase price within six months.
Recoverable short-swing profit
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Profit per matched share
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Illustrative only; not legal advice. Real cases match many pairs and depend on exemptions (e.g. Rule 16b-3 for many company grants). Ask counsel.
Reporting
What do Section 16 insiders have to file?
Chart
Section 16(a) filing deadlines
Know whether you're a Section 16 officer under Rule 16a-1(f)
Report sales, purchases, option exercises and gifts on time
Check the 10b5-1 box on Form 4 when it applies
Look back and forward six months before any open-market purchase
Treat ESPP, 401(k) stock-fund and derivative trades as potential matches until counsel says otherwise
Where Embark fits
Stop trading around your position. Let it earn.
Every buy and sell is 16(b) exposure. Enter your stock and see the targeted income on a hold-and-earn approach.
- One contribution instead of repeated trades
- Targets 10%+ annual income with $0 tax at contribution
- Keep the upside; clear Section 16 treatment with your GC first
Run the numbers
Live prices · takes under a minute · no obligation
Pitfalls
What triggers accidental 16(b) liability?
Do
- Pre-clear every transaction with the GC
- Use Rule 16b-3 exempt grants and plan transactions properly
- Count derivative positions, which can be purchases or sales
- Remember that a 10% holder status can arise from a group
Don't
- Don't buy the dip within six months of a 10b5-1 sale
- Don't assume a loss protects you
- Don't forget family-held shares attributed to you
- Don't hedge without counsel; collars and forwards can be matchable
Hedging tools such as a zero-cost collar or other executive hedges raise Section 16 questions too. See our hedging and pledging guide and 10b5-1 guide.
Where Embark Fits
Can you diversify without selling at all?
Every route above ends in a sale, and a sale of low-basis stock triggers capital gains. Embark takes a different route. You contribute concentrated stock in kind to an SPV structured as a partnership. Under Section 721 mechanics there is $0 tax at contribution. The SPV targets 10%+ annual income on the position and you keep the upside. It is open to accredited investors only, and the income is targeted, not guaranteed, and contributed shares have a 3-year lock-up.
Insiders: clear it first: Contributing shares to an SPV is a disposition of your company stock. For a director, officer or 10% holder it may be reportable on Form 4, may need to fit inside an open trading window or pre-clearance, and may interact with Rule 144 and your company's hedging and pledging policy. Clear any Embark contribution with your own securities counsel and your company's general counsel before you act.
Embark is not the only tool. Compare it fairly with exchange funds, a zero-cost collar and a prepaid variable forward. Each one has its own insider-policy issues.
FAQ
Section 16(b): common questions
Who is subject to Section 16(b)?
Directors, Section 16 officers (Rule 16a-1(f)) and beneficial owners of more than 10% of a registered class of equity securities.
Does 16(b) require insider information?
No. It's strict liability. Any matchable purchase and sale within less than six months triggers disgorgement of the profit.
How is short-swing profit calculated?
By lowest-in, highest-out matching across the six-month window, ignoring losing pairs. The result can exceed your actual net gain.
When is Form 4 due?
Within two business days after the transaction date for most changes in beneficial ownership.
Can contributing shares to an SPV trigger Section 16?
It may be a reportable disposition, and it could matter for matching. Clear it with securities counsel and your GC first.
Do RSU vests count as purchases under 16(b)?
Grants approved under Rule 16b-3 are generally exempt, so a routine vest is not usually a matchable purchase. Open-market buys are.
What is Form 5?
An annual report due within 45 days after fiscal year-end for exempt transactions and any holdings that should have been reported earlier.
Is Embark a way around insider trading rules?
No. An in-kind contribution is still a transfer of your shares, so company policy, trading windows, Rule 144 and Section 16 reporting can all apply. Clear it with your general counsel first.
Sources
Primary sources
Sources
Cite this article
Embark Funds Research. “Section 16(b) Short-Swing Profits The 6-Month Rule and Its Math.” Embark Funds, updated October 15, 2026. https://www.embarkfunds.com/insights/section-16-short-swing-profit-rule
Not tax, legal or securities advice: This article is educational. Charitable, securities and tax rules depend on your facts and your company's policies. Work with a CPA, an estate attorney and, for insiders, securities counsel before acting. Embark income figures are targets, not guarantees, and contributed shares have a 3-year lock-up.
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Income on Insider Stock Without Active Trading
Every buy and sell creates 16(b) exposure. Embark's SPV targets 10%+ annual income on concentrated stock with $0 tax at contribution. Accredited investors only. The contribution may itself be a Section 16 event, so clear it with your GC first.