The US stock market has not just been unusually quiet in 2017, it has been historically quiet, with basically no volatility or pullbacks, and major indexes shrugging off all manner of headwinds as they rose to a record number of records. However, the calm of this market may soon be coming to an end, MarketWatch reports.

That view comes courtesy of Goldman Sachs, which noted that January is by far the most common month of the year for companies to preannounce their quarterly results or provide insight into what their full year could look like. “This year, with tax reform adding an additional layer of uncertainty to earnings, these updates could be even more stock moving,” the investment bank wrote to clients.