Private equity firm Silver Lake takes stake in GoodRx, valuing it at about $2.8 billion. : Silver Lake, the technology-focused private equity firm, has taken a stake in health-technology startup GoodRx valuing it at about $2.8 billion, according to three people familiar with the matter. Silver Lake will own about one-third of the company, two of the people said, who asked not to be named because details of the deal are private. The investment will make Silver Lake the largest shareholder in GoodRX, one of the people said.