** Shares of healthcare service provider Premier PINC.O rise 9.5% to $28.20 premarket
** Premier says it will be acquired by private equity firm Patient Square Capital in deal valued at $2.6 billion
** Premier shareholders will receive $28.25 per share in cash, 9.7% premium to Friday's close
** Deal expected to close in first quarter of 2026
** As of last close, stock up 21% YTD