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In 1874, 57 district telegraph delivery companies affiliated and became “American District Telegraph”. With the increase in telephone usage in the late 19th century, ADT’s messenger business slowly declined in popularity.
ADT incorporated into Western Union in 1901 and separated its messenger business from its main signaling business at that time.
In 1964, ADT was found to be a monopoly in restraint of trade.
ADT broke away from AT&T in 1969 and became a publicly traded company on the New York Stock Exchange.
1981: ADT launches SafeWatch, an advanced residential surveillance system.
Hawley was a group of diversified companies active in service and other industries, including the electronic security industry. It had begun building its North American security company holdings in 1981 with the purchase of Electro-Protective Corporation of America in 1981.
At the end of 1987, the company sold its North American-based facility services business to Denmark’s ISS A/S.
In the early part of 1987, Hawley Goodall, owned by Lord Ashcroft bought the Indianapolis-based Crime Control Inc., the fourth-largest company in the United States security market, for $50 million.
Furthermore, ADT purchased Britannia Security Group PLC, an industry leader in the United Kingdom, in 1990.
Net income jumped similarly, to about $150 million in 1993.
1995: Western Resources purchases a 23 percent stake in ADT.
In fact, the firm acquired Alert Centre for $93 million in 1996 and also landed a contract with HFS, a franchiser of hotels and real estate brokerage offices.
Indeed by 1996, ADT controlled ten percent of the electronic security market, a $6 billion industry.
ADT officially became part of Tyco's Fire and Security Services division in 1998.
1999: The Mobile Security Network system is launched.
Under the leadership of Tyco, a globally diverse manufacturing and service company with sales of nearly $30 billion, ADT averaged 75,000 new accounts per month in North America during 2000.
2000: QControl, a passenger screening system developed by ADT, is installed in Miami International Airport.
The firm also acquired SCANA Security in 2001 in a $24.5 million deal.
2001: ADT creates a Financial Services and Banking division to capture increased sales in the financial industry.
In 2008, Brink's had spun out its home security business, which accounted for 15% of Brink's revenue that year, into a separate publicly traded company.
Brinks Home Security had rebranded as Broadview Security in 2009 with a massive advertising campaign.
In September 2011, Tyco announced that it would split into three companies, ADT being one of the three.
On October 1, 2012, ADT debuted as an independent public company and began trading on the New York Stock Exchange (NYSE: ADT).
In February 2016, Apollo Global Management acquired ADT for nearly $7 billion and merged it with another home security firm, Protection 1.
In October 2019, Telus Corporation purchased all of ADT's Canadian assets for $700 million.
By September 2020, Telus had renamed ADT's Canadian assets to Telus SmartHome Security.
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| Company name | Founded date | Revenue | Employee size | Job openings |
|---|---|---|---|---|
| Vivint Smart Home | 1999 | $1.2B | 5,750 | 297 |
| Protection 1 Inc | 1988 | $618.0M | 10 | - |
| LogMeIn | 2003 | $1.3B | 3,974 | - |
| Centurum | - | $67.0M | 750 | 253 |
| ListenUp | 1972 | $20.0M | 300 | 1 |
| TSR Consulting Services | 1969 | $101.4M | 606 | 11 |
| Buckeye Broadband | 1965 | $13.0M | 750 | - |
| Go Daddy Software Inc | 1997 | $473.4M | 4,422 | 11 |
| Charter Corp. | 1965 | $2.2B | 12,313 | - |
| OnStar | 1996 | $1.6M | 150 | - |
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