Here are the 10 US companies with the most to lose from the Brexit vote

After the historic decision by the United Kingdom to leave the European Union on Thursday, markets are reeling.

US stock indexes have erased all of their gains for 2016, and nearly every sector is in the red. Currencies are going wild and gold is soaring.

Some companies, however, have more to lose than others. Those US firms that sell a large amount of their products in the UK may have to reevaluate their business. In a time of uncertainty, for these firms the future is even more uncertain.

Using data from FactSet, we've compiled the US companies in the S&P 500 that generate the largest amount of their revenue from the UK.

Almost all of the firms tumbled in trading Friday, except Newmont Mining, which is riding on the back of the surge in gold prices.

Check out the firms with the most to lose following the Brexit below.