There is actually no particular law against insider trading at all, not even related to equities… it’s all securities and wire fraud. https://www.bloomberg.com/opinion/articles/2022-06-02/don-t-...
There actually is. See, well, a whole lot of 15 USC Chapter 2B [0], notably provisions like 15 USC Sec. 78p (prohibiting certain trades by corporate insiders, and creating civil liability of those conducting such trades to the issuer of the security thus traded) and 78u-1 (authorizing civil penalties by the SEC for insider trading made illegal by the Securities and Exchange Act.)
What Bloomberg probably meant to say is that there is not a distinct crime of insider trading, but that illegal insider trading is generally also the crime of securities fraud.