It is allowed: "Is after-hours trading right for you?
At Fidelity, you can trade listed equities and OTC equities—excluding pink sheets and bulletin board stocks (i.e., those that are not listed on an exchange)—during extended hours. Whether you choose to trade during extended hours depends on your investing style, objectives, and tolerance for risk. If you’re focused on building a diversified portfolio of high-quality stocks, bonds, and other investments, and are not comfortable with the heightened risks involved, you might be better off executing trades during normal market hours.
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