To qualify, the contract, instruction, or plan must be adopted before the person learns the information and must either fix the amount, price, and date of the trades, set them by a written formula or algorithm, or leave the person with no later influence over how, when, or whether trades happen. The trades must actually follow the plan: changing the amount, price, or timing counts as ending the plan and adopting a new one, and hedging around it defeats the defense.
The rule builds in waiting periods. A director or officer may not trade under a new plan until the later of 90 days after adoption or two business days after the company discloses financial results for the quarter in which the plan was adopted, with the wait capped at 120 days. Other persons, apart from the company itself, wait 30 days. Directors and officers must also certify in the plan that they are unaware of material nonpublic information and are acting in good faith. Overlapping plans are generally barred, and a plan designed to execute as one single trade can be used only once in any 12-month period.
Forms 4 and 5 have a check box for transactions made under a plan intended to meet Rule 10b5-1(c), and filers give the plan's adoption date in the explanation section. A sale under a plan adopted months earlier says less about the insider's current view than a discretionary sale does, though a plan adopted shortly before bad news is worth a closer look.