Berkshire Agrees to Limit Stake in DaVita to 25%

DaVita Dialysis Center in Lowry, Colorado.

Hyoung Chang | The Denver Post | Getty Images

Berkshire Hathaway and dialysis maker DaVita HealthCare entered into an agreement under which Berkshire will not increase its stake above 25 percent.

Berkshire also agreed not to push for board seats or seek to buy the company or engage in proxy fights with the company.

Berkshire is already DaVita's largest shareholder with a stake of about 13 percent.

But this isn't a Warren Buffett investment. Ted Weschler, who joined Berkshire in early 2012 as a portfolio manager, has been buying DaVita shares and signed the agreement.