The statute of limitations for a civil enforcement matter is five years.1 The statute of limitations for a criminal charge is six years.2 Note, however, that if a defendant is charged with conspiracy, that charge will include all relevant instances of insider trading accomplished during the course of the conspiracy, which allows the prosecution to prove insider trading beyond the six-year window.3
1 28 USC § 2462.
2 Dodd–Frank Wall Street Reform and Consumer Protection Act, Pub. L. No. 111-203, § 1079A(b)(1)(b), 124 Stat. 1376, 1862-64 (2010).
3 See, e.g., Superseding Indictment, United States v. Blaszczak, No. 1-17-cr-00357 (LAK) (S.D.N.Y. Mar. 15, 2018), ECF No. 137 (superseding indictment in 2018 charged insider trading violations dating back to 2009).