Among the companies with shares expected to trade actively in Monday's session are Novo Nordisk A/S (NVO, NOVO-B.KO), US Airways Group Inc. (LCC) and Radian Group Inc. (RDN).

Novo Nordisk said U.S. regulators have asked for additional testing on its hotly anticipated Tresiba insulin products, which could lead to a delay of the drug's launch in a key market. The U.S. Food and Drug Administration asked for additional cardiovascular data. The Danish company, which is the world's largest maker of insulin, said it doesn't expect to be able to provide the information during 2013. American depositary shares fell 14% to $165.65 premarket.

As AMR Corp.'s (AAMRQ) American Airlines and US Airways intensify their talks on a possible merge that could be announced in the coming days, US Airways pilots on Friday widely approved a provisional labor agreement that would help smooth the path toward a combination, their union said. Plus, according to The Wall Street Journal, experts have said that the potential deal would likely fly clear of government objections. U.S. Airways shares rose 1.7% to $15 premarket.

Radian Group's fourth-quarter loss widened as the year-earlier period included higher gains related to the fair value of derivatives and other impacts. Companies such as Radian Guaranty typically insure mortgages when a borrower makes a down payment of less than 20%. The loss was wider than expected and net premiums earned were lower than analyst estimates. Shares fell 5.5% to $6.35 premarket.

Celegene Corp. (CELG) said Chinese regulators approved Revlimid for relapsed or refractory multiple melanoma, while the U.S. Food and Drug Administration granted priority review status to the flagship blood-cancer treatment for patients with a rare blood cancer known as mantle-cell lymphoma. The biopharmaceutical company's shares rose 1.9% to $102 premarket.

Harvest Natural Resources Inc. (HNR) announced another oil discovery in the presalt offshore Gabon, West Africa. Shares of the independent oil-and-gas exploration and development company rose 4.9% to $9.50 premarket.

American Capital Mortgage Investment Corp. (MTGE), a real estate investment trust, reported that fourth-quarter per-share earnings came in slightly above analysts' estimates. "We prepared for the possibility of QE3 and positioned the portfolio appropriately, allocating more capital to assets less affected by QE3, with more upside to a potential housing recovery," said Chief Executive Malon Wilkus. Shares rose 3.9% to $26.45 in premarket trading.

 
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Boardwalk Pipeline Partners L.P.'s (BWP) fourth-quarter earnings rose 26% as the oil-and-gas transporter recorded strong revenue growth across all its segments.

Brookfield Asset Management Inc. (BAM) has agreed to buy 19 apartment communities for $414 million from Babcock & Brown Residential, as the alternative-asset manager aims to expand its multi-family platform.

Constellation Brands Inc. (STZ) filed a motion to intervene in the Department of Justice's lawsuit to block Anheuser-Busch InBev SA/NV's (BUD, ABI.BT) $20.1 billion bid to buy Grupo Modelo SA (GMODELO.MX), as the wine and spirits maker is set to expand as part of a side deal in the proposed merger. Anheuser-Busch InBev also came out in support of the motion.

Gulfport Energy Corp. (GPOR) agreed to acquire another 22,000 net acres in the Utica Shale in eastern Ohio from Windsor Ohio LLC for about $220 million as the oil-and-natural-gas producer continues to boost its presence in the shale basin.

Lowes Corp. (L) swung to a fourth-quarter loss as its CNA Financial Corp. (CNA) insurance unit was hit by losses related to Hurricane Sandy, and because of a large impairment charge at HighMount Exploration & Production LLC.

Write to Anna Prior at anna.prior@dowjones.com

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