NEW YORK ( TheStreet) -- Apple ( AAPL) CEO Steve Jobs announced Monday he was taking another medical leave, this time with no specified return date. The company also reports earnings after the closing bell Tuesday.

Shares of Apple fell 4.4% to $333.10 in premarket trading.

Citigroup ( C) posted fourth-quarter earnings of 4 cents a share. The Wall Street consensus called for earnings of 8 cents a share.

Citigroup shares were down 2% to $5.03.

Delta Air Lines ( DAL) reported adjusted fourth-quarter earnings of 19 cents on operating revenue of $7.8 billion. Analysts, on average, were expecting earnings of 26 cents a share on revenue of $7.73 billion.

Delta stock was down 2% to $12.50.

IBM ( IBM) is slated to post fourth-quarter earnings Tuesday after the market closes. The Wall Street consensus is calling for earnings of $4.08 a share on revenue of $28.26 billion.

IBM shares were down 0.2% to $149.72.

Comerica ( CMA) agreed to acquire Sterling Bancshares ( SBIB) in a deal that values Sterling at $10 a share, or $1.027 billion.

Comerica shares fell 3.9% to $40.59; Sterling was surging by 20.8% to $9.30.

Danaher ( DHR) signed a definitive agreement to sell its Pacific Scientific Aerospace business to Meggitt U.K. aerospace company, for $685 million.

Premarket trades weren't available for Danaher. Shares of the company ended Friday's trading session 0.6% higher at $47.15.

GlaxoSmithKline ( GSK) was falling 3.8% to $37.70 in early trading as Reuters reported that the company will report a legal charge of 2.2 billion pounds ($3.4 billion) in the fourth quarter, related to more claims over the sales of its Avandia drug.

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-- Written by Andrea Tse in New York.

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