Shares of DaVita (DVA) - Get Report  were up more than 5% in trading Monday after the company provided second-quarter operating income guidance that was ahead of analysts' expectations.

The kidney dialysis services provider expects to report second-quarter operating income between $460 million and $465 million, well above the FactSet consensus of $398 million. 

The company also expects second-quarter non-acquired treatment growth of 2.1% and revenue per treatment to increase by about $1.60 from the first quarter to $350. 

For the full-year, the company raised its adjusted operating income guidance to between $1.64 billion and $1.70 billion from between $1.54 billion and $1.64 billion. 

The company made the announcement ahead of its modified Dutch auction tender offer for up to $1.2 billion of its common stock. The auction is priced between $53.50 per share and $61.50 per share.

The auction will begin Monday and run until August 16 at midnight. 

DaVita shares were rising 5.11% to $58.92 in trading.