A binding trading arrangement that can provide a conditional affirmative defense when adopted before the trader becomes aware of material nonpublic information.
Definition
SEC Rule 10b5-1 provides an affirmative defense for qualifying purchases or sales made under a contract, instruction, or written plan established before the trader became aware of material nonpublic information. The arrangement must satisfy conditions governing trade instructions, later influence, cooling-off periods, certifications where applicable, and good-faith operation.
Rule 10b5-1 supplies a conditional affirmative defense to insider-trading liability; it is not SEC approval of a trade, immunity from enforcement, or proof that a transaction lacks information value. The plan and the reported transaction are separate facts: Form 4 still identifies the transaction as P, S, or another applicable code.
Related Form 4 codes
What the Rule Actually Provides
An insider may adopt a binding contract, instruction, or written trading plan before becoming aware of material nonpublic information. The arrangement must fix the amount, price, and date of the trades—or provide a formula or an independent decision maker—and the insider cannot retain later influence over execution. The insider must also act in good faith with respect to the plan.
For directors and Section 16 officers, the current safe-harbor conditions include certifications at adoption and a cooling-off period. Trading generally cannot begin until the later of 90 days after adoption or two business days after the issuer discloses financial results for the quarter in which the plan was adopted, subject to a 120-day maximum. Other persons relying on the defense generally face a 30-day cooling-off period.
How It Appears on Form 4 and in the Dataset
Forms 4 and 5 include a checkbox for transactions intended to satisfy Rule 10b5-1(c), plus the plan-adoption date. That checkbox is disclosure context, not a transaction code. A planned sale remains Code S; a planned purchase remains Code P.
In the InsiderAlpha sample, plan language is preserved in Notes when it appears in filing footnotes. Use Type, Date, accession_number, and Notes together. The sample does not expose a universal “is_10b5_1” field, so absence of plan language in Notes should not be treated as proof that a trade was discretionary. Open the source filing when that distinction affects a conclusion.
Real Filing Example
Signet Jewelers officer Mary Elizabeth Finn reported a July 18, 2024 Code S sale of 4,637 shares at a reported weighted-average price of $86.6947. The footnote states that the transaction followed a plan entered into on April 18, 2024 for diversification. InsiderAlpha therefore preserves both facts: the economic event is a sale, while the filing context says it was planned. SEC accession 0000832988-24-000170 links the observation back to the filing.
Common Analytical Errors
Error 1: calling every planned sale irrelevant. Adoption timing, amendments, termination, trade size, and the insider's remaining ownership can still matter.
Error 2: assuming a footnote proves safe-harbor compliance. The filer states the intended reliance; the SEC does not pre-clear each plan.
Error 3: comparing filing date instead of transaction date. Signal windows should use the transaction date, while filing and acceptance timestamps measure reporting latency.
Error 4: treating the plan checkbox as Code 10b5-1. There is no such Form 4 transaction code.
10b5-1 Evidence Hierarchy
| Evidence | What It Establishes | What It Does Not Establish |
|---|---|---|
| Plan checkbox | The trade was intended to satisfy Rule 10b5-1(c) | It does not prove compliance or make the trade an SEC-approved transaction. |
| Adoption date | Supports cooling-off and chronology review | It does not reveal all instructions, amendments, or the insider's motive. |
| Code P or S | Identifies the transaction's economic category | The code alone does not say whether a plan governed the trade. |
| Footnotes | May explain purpose, price ranges, and plan history | Footnote detail varies; verify against the full filing and issuer disclosures. |
Primary Sources & Filing References
- SEC: Insider Trading Arrangements and Related Disclosures
Primary SEC compliance guide covering cooling-off periods, certifications, disclosures, and good-faith conditions.
- SEC Release No. 33-11138
Final rule adopting the modern Rule 10b5-1 conditions and Form 4 disclosure changes.
- SEC filing: Signet Jewelers, accession 0000832988-24-000170
Source filing for the worked Code S example and its plan-adoption footnote.
Live Insider Data
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Why it matters for Whale Tracking
Plan status changes how a transaction should be interpreted, but it does not erase the economic event. Analysts should separate execution under a pre-existing instruction from a new discretionary decision while still evaluating size, timing, amendments, remaining ownership, and the underlying Form 4 code.
Technical Nuance
A Form 4 plan checkbox and adoption date provide disclosure context; they do not replace transaction codes P or S and do not prove that every safe-harbor condition was met. Absence of plan language in a summarized dataset is also not proof that a trade was discretionary.
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Real-World Example
"A 2024 Signet Jewelers Form 4 reported a Code S sale by Mary Elizabeth Finn and stated that it followed a Rule 10b5-1 plan entered into three months earlier. The filing preserves both facts: it was a sale, and execution was governed by an earlier plan."
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