NEW YORK ( TheStreet) -- Ensco ( ESV) said Monday it agreed to acquire Pride International ( PDE).

Under the agreement, Pride is being bought for $41.60 a share in cash and stock.

Ensco fell 3% to $52.80 during early trading Monday, while Pride International surged 16.6% to $40.10.

Chesapeake Energy ( CHK) plans to sell all of its Fayetteville Shale gas assets, as well as its equity investments in Frac Tech Holdings and Chaparral Energy.

Shares of Chesapeake Energy popped 3.8% to $31.20 in premarket trading Monday.

Danaher ( DHR) reached an agreement to buy Beckman Coulter ( BEC), a maker of biomedical testing equipment, for $83.50 a share in cash, or about $6.8 billion including assumed debt.

Shares of Danaher rose 2.8% to $49.31 during premarket trading Monday, while Beckman Coulter surged 9.8% to $ 82.55.

AOL ( AOL) said Monday it agreed to acquire Web site The Huffington Post for $315 million.

AOL was up 2.3% to $22.44.

Sanofi-Aventis ( SNY) and Genzyme ( GENZ) continue to work on clinching a deal, although an announcement may not come early Monday, according to published media reports.

Shares of Sanofi-Aventis were up 0.2% to $34.47 in early trading. Genzyme rose 1.3% to $74.33.

Humana ( HUM), the health insurer, said fourth-quarter earnings fell dramatically from a year earlier on a number of expenses.

Humana fell 3.4% to $58.49 in early trading Monday.

Hasbro ( HAS) said fourth-quarter net earnings fell 15.5% to $140 million, or 99 cents a share, from $165.6 million or $1.09 a share, a year earlier.

Net revenue fell 7.2% to $1.28 billion from $1.38 billion a year ago.

Analysts, on average, were expecting earnings of 95 cents a share on revenue of $1.31 billion.

Hasbro fell 1.8% to $44.

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-- Written by Andrea Tse in New York.

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