term:

Rule 10b-5

rule 10b-5 n

[10b-5 from the section of the Securities Exchange Act of 1934 pursuant to which the rule was formulated]
: a rule adopted by the Securities and Exchange Commission in furtherance of the Securities Exchange Act that outlaws fraud, deceit, misrepresentation, and manipulation in securities dealing in broad terms

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.