Two companies, DaVita in El Segundo, Calif. and Germany's Fresenius Medical Care, dominate the in-center market.

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Fresenius sees the home market remaining small, but it is working on a wearable artificial kidney.

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Two companies, DaVita in El Segundo, California and Germany's Fresenius Medical Care, dominate the in-center market.

FORBES: Magazine Article

DaVita also announced Jan. 7 that it acquired nine dialysis centers from Fresenius, located in Portugal and Poland.

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Germany's Fresenius Medical Care ( FMS, 57) grew steadily through the downturn.

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Other companies that derive more than 30% of their revenues from the U.S. are healthcare group Fresenius, supermarket chain Ahold, drug-makers Roche and Sanofi-Aventis, and Nestle.

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On Jan. 8, it announced it will partner with Fresenius Medical Care, another leading dialysis services and products provider with a 33% share of the dialysis market in 2011.

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The move is also its second of the new year, as DaVita began partnering with competitor Fresenius Medical Care ( FMS) though its DaVita Rx pharmacy, and made headway in Europe.

FORBES: Berkshire Hathaway Enlarges DaVita Stake as Company Expands