Definition of 'Rule 10b-18'
An SEC rule that provides a "safe harbor" for companies and their affiliated purchasers when the company or affiliates repurchase the company's shares of common stock (i.e., they will not be deemed to have violated anti-fraud provisions of the Securities Exchange Act of 1934). The repurchases must fall within the four conditions of the rule. These cover the manner of purchase, the time of the repurchases, the prices paid and the volume of shares repurchased.
Investopedia explains 'Rule 10b-18'
The rule breaks down as follows:
The SEC also specified more detailed disclosure requirements for repurchases. In each quarterly report on Form 10-Q and in the annual report on Form 10-K, the company must provide a table showing, on a month-by-month basis: the total number of shares purchased, the average price paid per share, the total number of shares purchased under publicly announced repurchase programs, and the maximum number of shares that may be repurchased under these programs (or maximum dollar amount if the limit is stated in those terms).