Many investors are having a hard time navigating the stock market right now, as choppy conditions have led to a volatile start to the new year. Major market indexes gave up early gains on Monday, and Wall Street looks ready for a lower open on Tuesday morning based on stock index futures.

Several stocks made big moves Tuesday morning on news related to mergers and acquisitions. For Oak Street Health (NYSE: OSH), speculation about a potential acquisition by a healthcare giant gave the stock a big boost. Elsewhere, Frontline's (NYSE: FRO) decision regarding a planned combination with Euronav (NYSE: EURN) led to sizable moves for both stocks.

Shares of Oak Street Health jumped 34% in premarket trading on Tuesday morning. The climb came after reports that CVS Health might be interested in purchasing the operator of primary healthcare centers.

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Source Fool.com