Companies may soon have to report whether they let their directors or employees hedge against decreases in the value of company stock, thanks to the SEC and the Dodd-Frank Act.

The Securities and Exchange Commission on Dec. 19 will vote on whether to adopt hedging disclosure rules required by the 2010 Dodd-Frank law, according to a Dec. 12 open meeting notice. The SEC proposed the regulation in 2015 under then-Chairman Mary Jo White, an appointee of President Barack Obama....