Among the companies with shares expected to actively trade in Monday's session are KBW Inc. (KBW) and BioMarin Pharmaceutical Inc. (BMRN).

Stifel Financial Corp. (SF) agreed to acquire financial services-focused investment bank KBW Inc. (KBW) for $17.50 a share in cash and stock, a 7.3% premium to Friday's close. The tie-up, valuing KBW at roughly $575 million including restricted stock awards, must still be approved by KBW shareholders. KBW shares jumped premarket.

BioMarin Pharmaceutical Inc. (BMRN) said its drug for a rare genetic disorder met its primary endpoint in a late stage study. Shares surged 27% to $47.40 in premarket trading after the company said it now plans to seek approval for the drug early next year. "The GALNS clinical program is currently the highest development priority at BioMarin, and this positive Phase 3 study serves as a potentially transformative milestone for the company," said Chief Executive Jean-Jacques Bienaime.

Ryman Hospitality Properties Inc. (RHP) declared a special dividend of $6.84 a share, marking another step toward the hospitality-and-entertainment company's conversion into a real-estate investment trust. Shares rose 4.4% to $39.51 in premarket trade.

 
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Warren Buffett's Berkshire Hathaway Inc. (BRKA, BRKB) said third-quarter profit jumped 72% to $3.92 billion on investment gains and an improvement in the company's derivatives portfolio. But operating earnings, Mr. Buffett's preferred metric for evaluating his company, fell 11% to $3.4 billion. The decline was the result of an unfavorable comparison to last year's third quarter, when the company benefited from a large re-estimation of reserves at one of its reinsurance operations.

Cheniere Energy Inc.'s (LNG) third-quarter loss widened as the energy company continued to report heavy costs related to the development of a liquefied natural gas export project. Cheniere Energy Partners LP (CQP), a limited partnership formed and controlled by Cheniere Energy, also reported that its loss widened.

Facebook Inc. (FB) executives, including Sheryl Sandberg, have sold a portion of their stock in the social site as restrictions on insider sales at the company have lapsed, according to filings with the Securities & Exchange Commission.

JetBlue Airways Corp. (JBLU) said cancelled flights and expected softening of short-term demand due to Hurricane Sandy will have a "material" impact on fourth-quarter earnings.

The U.S. Food and Drug Administration approved the expansion of uses for the blood thinner Xarelto to include treating certain blood clots and reducing their recurrence. Xarelto is an anticoagulant co-marketed by Johnson & Johnson (JNJ) and Bayer AG (BAYRY).

MetLife Inc. (MET) announced late Friday that it will sell its $70 billion mortgage-servicing portfolio to J.P. Morgan Chase & Co. (JPM), furthering the life insurer's efforts to exit the banking business.

Valspar Corp. (VAL) said Chief Financial Officer Lori A. Walker plans to retire and will remain with the company until a successor is named.

Write to Mia Lamar at mia.lamar@dowjones.com

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