By Michael Dabaie 



  ADT Inc. said Google would invest $450 million to acquire 6.6% ownership in ADT and the companies entered into a long-term partnership to create smart home security offerings. 


  ADT shares were up 50% to $12.92 premarket. 


  The partnership will combine Nest hardware and services, powered by Google's machine learning technology, with ADT's installation, service and professional monitoring network. 


  ADT expects to offer some Google devices to its customers beginning this year and to expand the integration in 2021. 


  Google, which is part of Alphabet Inc., will make a $450 million investment in ADT in exchange for shares of a newly created Class B common stock having all of the rights and preferences of ADT's common stock except for the right to vote on the election, appointment or removal of directors. Upon the closing of Google's equity investment, Google will own a 6.6% stake in ADT. 


  ADT said it expects Google's equity investment to close in the third quarter of 2020. Proceeds will be used to fuel growth and reduce leverage over time. 


  Each company will commit an additional $150 million, subject to the achievement of milestones, for co-marketing, product development, technology and employee training. 


  Write to Michael Dabaie at michael.dabaie@wsj.com