here are some bigger movers monday as the us stock market appeared poised for a muted start to the new week circor international incs stock cir rocketed 50 in morning trading after the flowcontrolproducts company announced a deal to be acquired by kkr  co in a cash deal valued at 16 billion including debt kkr shares kkr edged up 01 shares of apple inc aapl rose 15 toward a record close ahead of the technology behemoths developers event wwdc in which the company is expected to preview a mixedreality headset tesla incs stock tsla rose 25 toward a sevenmonth high and a seventhstraight gain which would be the longest in two months even after the electricvehicle giant recalled 137 model y vehicles due to risks of a loss of steering control amedisys inc shares amed shot up 14 after the athome healthcare services company said it received a 100pershare cash buyout bid from unitedhealth group incs optum division which amedisys believes could be a superior proposal to the merger deal already agreed on with option care health inc in early may option cares stock opch jumped 65 day one biopharmaceuticals inc shares dawn powered up 12 after the company shared new data on tovorafenib an investigational treatment for relapsed or progressive pediatric lowgrade glioma shares of palo alto networks inc panw rose more than 3 after sp dow jones indices promoted the 66 billion cybersecurity company to the sp 500 index in a series of quarterly index adjustments to account for market cap shares of epam systems inc epam tumbled 17 to pace all decliners in the sp 500 index the engineering software company cut its profit and revenue outlook citing further deterioration in nearterm demand mallinckrodt plcs stock mnk plunged 25 after the drug maker disclosed that certain debt holders proposed another bankruptcy filing given the companys financial position ahead of a 200 million payment due as part of the companys opioid settlement bellerophon therapeutics incs stock blph plummeted 85 after the biotherapeutics company said its lungdisease treatment failed to meet its primary endpoint in a phase 3 rebuild study shares of gannett inc gci fell 12 and of zumiez inc zumz slumped 11 on their scheduled removal from the small cap index this content was created by marketwatch which is operated by dow jones  co marketwatch is published independently from dow jones newswires and the wall street journal