ADT Inc.

ADT Inc.

Company type	Public
Industry	Security services
Predecessor	American District Telegraph
Founded	1874 (1874)
Founder	Edward A. Calahan
Headquarters	Boca Raton, Florida , United States
Area served	United States
Products	Electronic security, fire protection, alarm monitoring solutions
Owner	Apollo Global Management (majority owner as of 2023)
Number of employees	17,000+ (2019)
Website	adt.com

ADT Inc., previously known as the ADT Corporation, stands as a prominent American provider of electronic security, fire protection, and alarm monitoring solutions tailored for residential and small business clients throughout the United States. The company’s main offices are situated in Boca Raton, Florida. In February 2016, ADT was acquired through a $6.9 billion leveraged buyout by Apollo Global Management. It later re-entered the public market with a listing on the New York Stock Exchange in January 2018.

History

The origins of ADT trace back to 1863 when Edward A. Calahan, the founder, invented the stock ticker and founded the Gold and Stock Telegraph Company in 1867 to commercialize this innovation. The firm also created a telegraph-based messenger system designed for stock exchange communications. Motivated by a burglary incident, the company’s president devised a telegraph alert network linking 50 neighbors to a centralized monitoring station, laying the groundwork for ADT’s security services.

By 1874, 57 regional telegraph delivery firms united to form American District Telegraph (ADT). As telephone adoption increased, ADT’s messenger service declined, prompting the company to diversify into signaling services while continuing telegraph operations. ADT became part of Western Union in 1901 and separated its messenger and signaling divisions. In 1909, both Western Union and ADT came under the American Telephone & Telegraph Company (AT&T), with ADT expanding its offerings to include fire and security alarm systems from 1910 through 1930.

During the 1960s, ADT transitioned into a publicly traded company. By 1964, it was identified as a monopoly dominating nearly 80% of central station alarm services in the U.S., which led to regulatory interventions enforcing standardized national pricing and penalties aimed at encouraging competitive practices.

In 1987, Hawley Goodall, led by Michael Ashcroft, acquired Indianapolis-based Crime Control Inc. for $50 million before purchasing ADT and relocating its headquarters to Bermuda. This move positioned Hawley as the foremost security services provider in the U.S., with North America generating most revenue. Hawley subsequently rebranded as ADT Limited, concentrating on security services while divesting facility management operations.

In 1997, Tyco International acquired ADT through a reverse takeover. Tyco pursued further expansion via acquisitions such as Broadview Security (formerly Brink's Home Security) in 2010 for $2 billion, merging Broadview’s operations under the ADT brand to consolidate market presence.

Tyco announced its corporate split in 2011; consequently, ADT re-emerged as an independent publicly traded company on the New York Stock Exchange in 2012 under the ticker symbol ADT. In 2014, ADT extended its footprint into Canada by acquiring Reliance Protectron Security Services for Can$555 million.

Apollo Global Management purchased ADT in February 2016 for close to $7 billion and combined it with Protection 1, creating an entity valued at around $15 billion. ADT returned to public trading in January 2018 with Apollo maintaining majority ownership as of 2023.

As part of its growth initiatives within commercial markets, ADT acquired Aronson Security Group Inc. and Acme Security Systems in April 2018. However, in October 2019, Telus Corporation acquired all Canadian operations for $700 million; by September 2020, these assets were rebranded as Telus SmartHome Security.

Strategic alliances have played a vital role in ADT’s development: Google invested $450 million in August 2020 securing a 6.6% ownership stake to integrate Nest smart home technology within ADT’s platform. In September 2022, State Farm invested $1.2 billion acquiring a 15% equity interest along with pledging up to $300 million toward marketing and innovation efforts; Google contributed an additional $150 million to support expansion.

In November 2021, ADT diversified into residential solar energy by acquiring Sunpro Solar for $160 million plus stock consideration (total enterprise value approximately $825 million), subsequently rebranding it as "ADT Solar." Due to financial difficulties, ADT announced plans to discontinue its solar division in January 2024.

In July 2023, ADT revealed accounting discrepancies related to goodwill impairment losses from its Solar segment, necessitating restatement of financial results for late 2022 and early 2023 quarters and causing investor concern reflected by a decline in stock value.

Most recently, in October 2023, ADT finalized the sale of its commercial security, fire protection, and life safety business unit to private equity firm GTCR for $1.6 billion. This divestiture refocused the company’s efforts exclusively on residential security services, strengthening its position within that core market segment.

Operations

By March 2019, ADT managed nine monitoring facilities staffed by over 17,000 employees, catering to a customer base of 6 million throughout more than 200 sites in the United States. This broad infrastructure reinforces ADT's leadership position within the security sector and serves as a foundation for its ongoing business expansion and financial success.