Business Google buys $450M stake in ADT to give Nest a new perch Updated : August 04, 2020 08:41 AM IST ADT, whose roots date back to 1874 when it was formed as American District Telegraph, has about 6.5 million customers. The alliance could serve as a springboard for a home management product line that Google has been developing. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.