The U.S. Securities and Exchange Commission (SEC) told broker-dealers and investment advisors that certain products are complex and carry additional risk.

The regulator named cryptocurrencies, or “crypto asset securities,” as one class of assets that require “heightened scrutiny” from financial professionals.

It also named inverse or leveraged exchange-traded products (ETPs), margin-traded instruments, derivatives, penny stocks, and various other assets and investment vehicles as examples of investments that carry additional risk.