Among the companies with shares expected to actively trade in Monday's session are Uni-Pixel Inc. (UNXL), DaVita Healthcare Partners Inc. (DVA) and Fresenius Medical Care AG & Co. (FMS, FME.XE).

Shares of touch-sensor technology maker Uni-Pixel slid after the company disclosed in a Securities & Exchange Commission filing that the agency is inquiring about the company's business deals. The SEC has looked into the company's agreements related to its InTouch Sensors, though Uni-Pixel said the inquiry shouldn't be viewed as an indication that any violations of law have occurred. Shares tumbled 17% to $11.60 after hours.

DaVita and Fresenius traded higher after the Centers for Medicare and Medicaid Services said it will reduce payments to kidney dialysis providers by less than 1% over the next two years in a reversal of the much-larger cuts it had proposed earlier this summer. The move handed at least a temporary victory to dialysis providers like DaVita and Fresenius. DaVita's shares jumped 9.8% to $62.05 after hours, while Fresenius' stock climbed 6.3% to $34.26.

 
   Watch List: 
 

Allegion PLC (ALLE) will replace J.C. Penney Co. (JCP) in the S&P 500 index after trading concludes Nov. 29, S&P Dow Jones Indices said Friday. Ingersoll-Rand PLC (IR) is due to complete its spinoff of Allegion, which focuses on commercial and residential security, on that date.

Tower Group International Ltd. (TWGP), which is struggling due to a soured acquisition, Friday reported its second-quarter financial results after previously postponing the release twice before. Tower Group said its loss widened in the quarter on $578 million in charges to strengthen its loss reserves and a balance sheet writedown.

Mobile device chipmaker Qualcomm Inc. (QCOM) expects to continue growing in China, but Chief Executive Paul Jacobs acknowledged U.S. restrictions on Chinese companies and revelations about surveillance by the National Security Agency are impacting its business in the fast-growing country.

Write to John Kell at john.kell@wsj.com

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