NEW YORK (TheStreet) -- Shares of Glencore (GLNCY) are being hammered on Monday, down nearly 26%. This relentless selling may come as little surprise by now because the Swiss commodity giant is now down 77% on the year. 

A negative research report from Investec suggests the company's equity could be worthless if commodity prices don't rebound. Shares hit new all-time lows in the session. 

This is a stock that many investors know very little about because it is a foreign entity, TheStreet's Jim Cramer, co-manager of the Action Alerts PLUS portfolio, said on CNBC's "Mad Dash" segment. It is one of three companies Cramer warned investors about last week.

Glencore GLNCY data by YCharts

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The company's bonds are getting crushed, too, Cramer pointed out. With the bonds down so much, it's no surprise the stock is also getting hit hard on Monday. 

This is a very large company that investors should keep an eye on. While it won't cause a financial crisis like the one seen in 2008, it could cause a brief selloff in the stock market if the situation worsens, Cramer said. 

At the time of publication, Cramer's Action Alerts PLUS had no position in stocks mentioned.