Summit Health Ltd. reported the completion of...

Summit Health Ltd. reported the completion of its acquisition of St. Luke Hospital in Pasadena for $13.5 million from the Order of the Sisters of St. Joseph of Orange . . . Lear Siegler said it bought back about 4.9% of its stock for about $54.6 million, but the company declined to give other details of the transaction or the reason for the buy-back . . . Boeing Co. will ask shareholders at its April 28 annual meeting to approve rules to deter hostile takeover attempts.