The US Securities and Exchange Commission (SEC) has said it will be paying close attention to the equity markets following yesterday's Brexit vote, which was announced this morning.
A statement by SEC chair Mary Jo White read:
The US equity markets opened normally for trading this morning. We are continuing to closely monitor the markets and have been in regular communication with financial institutions, exchanges, and market utilities, as well as our financial regulatory counterparts.
The UK's decision to opt to leave the EU has whipped markets worldwide into a tizzy.
Pre-market opening, the US stocks were trading low.
|Brexit Britain: What you need to know|
Meanwhile, trading on the Nikkei 225 was suspended after the index fell to its lowest level since the end of 2014 as the Brexit decision emerged.
Sterling has also struggled, crashing to its lowest level against the dollar for over 30 years.