ia ▁S iem ens ▁later ▁div ested ▁its ▁call ▁monitoring ▁business , ▁and ▁reduced ▁its ▁activities ▁in ▁Iran . ▁ ▁In ▁October ▁ 2 0 0 9 , ▁S iem ens ▁signed ▁a ▁$ 4 1 8 ▁million ▁contract ▁to ▁buy ▁So le l ▁Sol ar ▁Systems , ▁an ▁Isra eli ▁company ▁in ▁the ▁solar ▁thermal ▁power ▁business . ▁ ▁In ▁December ▁ 2 0 1 0 , ▁S iem ens ▁agreed ▁to ▁sell ▁its ▁IT ▁Sol utions ▁and ▁Services ▁subs idi ary ▁for ▁€ 8 5 0 ▁million ▁to ▁At os . ▁As ▁part ▁of ▁the ▁deal , ▁S iem ens ▁agreed ▁to ▁take ▁a ▁ 1 5 % ▁st ake ▁in ▁the ▁en larg ed ▁At os , ▁to ▁be ▁held ▁for ▁a ▁minimum ▁of ▁five ▁years . ▁In ▁addition , ▁S iem ens ▁concluded ▁a ▁seven - year ▁out s our cing ▁contract ▁worth ▁around ▁€ 5 . 5 ▁billion , ▁under ▁which ▁At os ▁will ▁provide ▁managed ▁services ▁and ▁systems ▁integration ▁to ▁S iem ens . ▁▁ 2 0 1 1 ▁to ▁present ▁In ▁March ▁ 2 0 1 1 , ▁it ▁was ▁decided ▁to ▁list ▁Os ram ▁on ▁the ▁stock ▁market ▁in ▁the ▁aut umn , ▁but ▁CE O ▁Peter ▁Lö scher ▁said ▁S iem ens ▁intended ▁to ▁retain ▁a ▁long - term ▁interest ▁in ▁the ▁company , ▁which ▁was ▁already ▁independent ▁from ▁the ▁techn ological ▁and ▁manager ial ▁view points . ▁ ▁In ▁September ▁ 2 0 1 1 , ▁S iem ens , ▁which ▁had ▁been