Big financial firms like Goldman Sachs and JPMorgan Chase are adding overnight staff to handle potential market turbulence and heavy trading activity|RMajouji|CC BY 2.5

As the polls close today, global investors are gearing up for a tense week. Financial firms like Goldman Sachs and JPMorgan Chase are adding overnight staff to handle potential market turbulence and heavy trading activity, Bloomberg reports.

Retail banks are on alert for possible political unrest.

Some traders who previously invested in stocks tied to Donald Trump are rethinking their moves due to recent polls. 

Meanwhile, others are playing it safe, holding extra cash and betting against big market drops. Calvin Yeoh of Blue Edge Advisors said the close race makes trading challenging.

Congressional results also matter as a split government could limit major changes.

Historically, the S&P 500 gains 3.7% after an election year, though uncertainty this week could impact markets alongside the Federal Reserve’s upcoming rate decision.