1. Allied Universal

Allied Universal is one of the largest private security companies in North America, with more than 150,000 employees working in 120 offices across the US. The company specializes in a variety of different fields and takes pride in having carefully screened and trained security officers who are sensitive to unique business environments.

2. Andrews International

Andrews International has long been recognized for its focus on earning business with greater value. This has distinguished the company from its competitors, who typically rely on security guards to protect their premises.

Andrews International was founded in Los Angeles in 1988 as a response to the demand from Hollywood studios for security forces with advanced skills and training. Their innovative anti-piracy program soon expanded their reach into new sectors, and they are now one of the leading providers of security services throughout the world.

Andrews International provides armed and unarmed security guards for businesses, as well as specialized government and defense department solutions. In 2009 it bought Canadian global security giant GardaWorld’s U.S. and Mexican guarding services for a sum exceeding $44 million making it one of the largest security companies in America.

3. Brinks

Brinks is the world’s largest cash management company, with a network that covers nearly every corner of the globe. The company employs roughly 60,000 people and operates in over 100 countries. Chicago-based Brink’s City Express began using a horse-drawn wagon to move customers’ suitcases from local railroad stations to hotels in 1859.

In 1891, Brink’s Company made its first cash-in-transit delivery transporting half a dozen bags filled with silver dollars. These days, Brink’s is perhaps best known for its fleet of armored vans – which it uses to help see to the needs of governments, mints, banks, jewelers and other businesses. It also offers airport security guarding and logistical and cash management services. In 2011 Brinks brought in $3.9 billion in revenue

4. Pinkerton Government Services

Allan Pinkerton, a detective and spy, founded the Pinkerton National Detective Agency in 1850. It is one of the oldest security companies in America, and provides a full range of cleared protective services to meet the specific requirements of the U.S. government.

In 2003, Pinkerton was acquired by Swedish security giant Securitas AB. The company is currently in the process of changing its name to Securitas Critical Infrastructure. Pinkerton has a long history of helping law enforcement track down notorious criminals, working with famous figures such as Abraham Lincoln and Jesse James.

5. Chief Information Security Officer

A senior executive-level position in information security, one of the highest paying jobs in the field, is held by a professional called a CISO. They are responsible for developing and implementing cyber security plans and policies for an organization, mitigating risks to their data, assets and hardware.

The CISO is responsible for

• Auditing and reviewing existing cyber security policies
• Directing IT and cyber security personnel
• Drafting and enhancing new cyber security policy
• Hiring an IT team
• Maintaining advanced knowledge of existing and emerging threats to cyber security
• The preparation of financial reports

A CISO should have a bachelor’s degree in computer information systems, management information systems, or IT management and project management. A Master’s in business administration (MBA) may also be required for executive-level roles.

A CISO will earn between $154,000 and $380,000 annually with a median salary of $249,000.

Average Salary: $249,000

6. Security Architect

A security architect is one of the highest-paying jobs in the security field. They design, build, test, and implement systems within a network, and must have an understanding of IT systems and all of the latest security protocols.

A Security Architect’s duties include:

• Conducting scheduled system tests and monitoring network security
• Developing timelines for ongoing system upgrades and related projects
• Drafting and presenting complete briefs on new and existing programs, potential, and appropriate responses
• Drafting emergency recovery protocols and conducting security breach drills
• Ensuring appropriate personnel have access to the system
• Responding to all security incidents promptly and providing post-event de-briefs
• Reviewing existing security measures, recommending and implementing improvements and upgrades

A senior cyber security position holder should be prepared to consult with and deliver presentations to the organization’s management and executives on an as-needed basis.

Average Salary: $124,600

7. Risk Manager

The job of an RM is to work with clients to identify and assess any potential risks to the company which could impair its safety, reputation, security, property or financial wellbeing. After identifying and evaluating all potential risks, it is the RM’s job to create and implement processes designed to minimize these risks. This is one of the highest-paying jobs in the security field.

The role of the risk management consultant is to create detailed risk assessment information that can be used to develop processes for dealing with potential risks.

Most client company processes should not require the ongoing presence of an RM.

A professional risk management (RM) consultant should have close relationships with clients in order to develop intimate knowledge of their particular risk profile. This information can then be used to provide guidance and support when making decisions about investments and other business activities.

Average Salary: $101,404

8. Systems, Network, and/or Web Penetration Tester

Network security consultants who try to break into systems and find ways to exploit them are highly sought-after and can earn a good living.

The PenTester is expected to run numerous tests in order to achieve network penetration. After they have completed the tests, the PenTester will present their findings in an assessment report.

Penetration testers often use pre-determined test types, but they also design their own tests. This requires creativity, imagination, and determination as well as a high degree of technical know-how.

A penetration tester must have a deep understanding of the systems they are testing, as well as the latest updates and patches for these systems. They must also be willing to keep up to date on new system vulnerabilities in order to provide reports that are accurate and useful.

Average Salary: $83,137

9. Network Security Engineer

A network security engineer is a highly-paid IT and software engineer who responsible for maintaining computer hardware and software comprising a computer network. They also deal with the health of the total network, server use, and implementation as well as security.

NSE duties and responsibilities include;

• Installing, configuring and maintaining computers, devices, networking equipment, and operating systems
• Network design, security, and especially troubleshooting problems
• Securing IT infrastructure to provide measurable, reliable, consistent, and secure networking services
• Deterring and preventing cyber attack
• Handling security breaches, preventing intrusion, analyzing network traffic, and encryption
• Maintaining an authorization infrastructure and network backup systems
• Maintaining network facilities, devices, drivers, and device settings
• Maintaining network servers, file servers, VPNs, intrusion detection

Average Salary: $82,760

10. Network Security Administrator

A Network Security Administrator (NSA) is a highly-paid security professional who ensures the health of computer networks and takes care of cybersecurity concerns. They work with IT professionals to deploy servers, implement security measures, and more.

The NSA ensures that the network meets the needs of the organization, and is aligned with the required technical parameters of network administrators.

The duties of an NSA include:

• Installation, configuration, and maintenance of computers, equipment, and software
• Network design and security, troubleshooting and debugging network problems
• Maintenance of system authorization infrastructure, and backup systems
• Assigning IP addresses to devices
• Introducing and incorporating new equipment
• Performing corrective/preventative measures on existing devices
• Maintenance of file servers, gateways, attack detection systems, etc.
• Patching systems and locking down systems when necessary

An NSA can expect to earn between $63,000 and $90,000 annually.

Average Salary: $76,500

11. Cyber Crime Investigator

The CCI will collect evidence from digital assets and resources to use in prosecuting or defending a suspect. The CCI is also liable to be called upon by a court to provide expert testimony which the judge or jury can use in developing and delivering decisions.

Cybercrime investigators are in high demand, as many organizations face greater threats from cyber-attacks. They work to identify and punish those responsible for cybercrimes, and sometimes work with law enforcement to bring offenders to justice.

A CCI’s duties include:

• Analyzing computer system crimes
• Consult with clients, supervisors, and managers
• Developing forensic skills through research and training
• Gathering evidence and information
• Maximizing computer system performance
• Preparing expert reports
• Recovering data
• Testifying in court
• Training law enforcement on IT related issues

A CCI can be expected to earn between $50,000 to $100,000 annually.

Average Salary: $75,000

12. Information Security Analyst

An Information Security Analyst is responsible for implementing measures to protect computer networks, information, and assets. They are often in high demand and can earn a good salary.

ISA professionals are responsible for ensuring that digital files and mission-critical data infrastructure are protected from cyber attacks, security breaches, and malware. They should be prepared to respond to cyber attacks and other security threats.

Duties of an ISA include:

• Training users and promoting security awareness
• Developing plans to safeguard computer files
• Conferring with users to discuss data access needs, security violations, and programming changes
• Monitoring computer virus reports
• Modifying security files to incorporate new software, fix errors, or change access statuses
• Coordinating computer system plan implementation with personnel and vendors
• Monitoring the use of data files and regulating access

Average Salary: $71,309

13. Security Analyst

Security analysts are essential to maintaining an organization’s security and privacy. They work with various departments in an organization to recommend specific measures and procedures to create and maintain a secure infrastructure. This is one of the most lucrative jobs in security, as there is a growing demand for these professionals.

A security analyst is responsible for ensuring the company’s information technology assets are protected from unauthorized access. This includes protecting both physical devices and software, as well as developing an overall IT security plan in case of an attack. If an attack does occur, it would be the analyst’s job to direct resources towards mitigating or responding to it.

The Duties of a SA include:

• Conducting security appraisals through vulnerability testing and risk analysis
• Monitoring security access
• Performing internal and external security audits
• Verifying third-party vendor security

Average Salary: $67,419

14. Security Manager

A security manager directs a client organization’s security assets and functions, including the physical asset security and safety of guests, customers, employees, facilities and assets. A SA is in charge of maintaining the operational integrity of security staff patrols routes and ensuring that they are followed.

A security manager will be expected to write and/or review documents related to security, such as reports, tactical and strategic initiatives, and proposals. They will also supervise the discipline of security staff and personnel.

Security managers earn an average annual salary of $42,000 to $68,000.

Average Salary: $55,000

15. ACADEMI

Blackwater USA, originally known as Academi, was founded in 1997 by ex-U.S. Navy SEAL Erik Prince. The company received its first government contract in 2000 and has since fulfilled over 100,000 training requests for armed forces personnel around the world.

After the 2003 invasion of Iraq, Blackwater Worldwide became known as Xe Services LLC. In 2010 private investors took over, and in 2011 the company became ACADEMI.

ACADEMI offers crisis management services to protect people and locations experiencing turmoil. It works with federal, state, and local government clients, as well as commercial customers and numerous law enforcement and intelligence organizations around the world.

16. ICTS International

In 1982, Israeli security personnel formed ICTS International N.V., a private security company with headquarters in Amstelveen, Netherlands. The company specializes in providing advanced security solutions for the aviation and homeland security sectors, with a focus on transportation security in general and rail transport safety in particular.

I-SEC International Security BV is a company that focuses on airport and airline security. In 2005, ICTS International created a computer technology called Advanced Passenger Screening. This technology is used by most major U.S. airlines, based on passenger information. In 2008, ICTS International’s revenue totaled $98 million

17. Northbridge Services Group

Northbridge Services Group is a private military contractor that provides security-related services to a variety of clients, including governments, multinational corporations, non-governmental organizations, the corporate sector, and prominent individuals. Lieutenant Colonel Robert Kovacic founded Northbridge in 2003 and is currently its CEO and president.

Northbridge provides a range of security-related services, including advisory and training, operational support, intelligence gathering, and strategic communication. The company has also been involved in law enforcement activities relating to terrorism, narcotics trafficking, organized crime syndicates, poaching and smuggling. In 2003 Northbridge became headline news when it offered to capture Liberian president Charles Taylor for a fee of $4 million. In 2012 Northbridge’s revenue totaled $50.5 million

18. Triple Canopy

Triple Canopy is a private security, risk management, and defense contracting company based in Reston, Virginia. Former U.S. Special Forces soldiers founded the firm in Chicago in 2003, and many of Triple Canopy’s employees are former special ops personnel and police officers. The company provides mission support, security services, and training to government agencies and multinational corporations worldwide.

The company employs 5,500 staff and has clients in the NGO, telecommunications companies, oil and gas businesses, mining firms and financial organizations from around the world. The chain of command includes former Delta Force soldiers, consultants, and analysts. Triple Canopy rose to prominence in 2004 in Iraq; one of its Iraq defense contracts is valued at $1.5 billion

19. Prosegur

Prosegur, a multinational private security company with headquarters in Madrid, is one of the largest providers of security services in the world. The company was founded in 1976 and employs 150,000 people across Europe, Asia, Oceania, and Latin America. Prosegur’s main service areas include manned guarding (particularly around high-profile locations such as airports and corporate campuses), home security (including installation of alarm systems), fire defense (assisting with emergency response times to large-scale fires), and consulting on security technology issues. In 2011 Prosegur earned $233.748 million

With over 4,700 armored vans, Prosegur is a well-known provider of cash-in-transit services. It also offers technology services such as CCTV monitoring, access control, and “anti-intrusion and perimeter detection.” Meanwhile, its provisioning guard service features armed and unarmed guards as well as K9 units.

20. Aegis Defence Services

Aegis Defence Services is a private military company with foreign offices in several countries, as well as the United States. It was founded by a former director of Sandline International, and provides security services to various organizations around the world.

Aegis is a multinational company with interests in NGO, aerospace, and government and diplomatic sectors as well as oil, gas, and mining industries. The company has a $293 million contract with the U.S. government to provide protection during the restructuring of Iraq. In 2011 Aegis secured a $497 million contract to protect the U.S Embassy situated in Kabul, Afghanistan

21. GK Sierra

GK Sierra is a private military company that was founded in 2007. The company produces secure communication technology for the United States government, and two years later it began offering investigation and intelligence options among its services.

GK Sierra is a private intelligence company that gathers intelligence for the CIA. It has an office in Tel Aviv and employs high-ranking Mossad operatives, which has led to accusations that it is actually part of the Israeli Intelligence Service. GK Sierra emphatically rejects these allegations. Its specialties include corporate investigation and intelligence, digital forensics, and encryption technology. It is also purported to have “direct action” operatives on the ground in various countries around the world.

22. KBR

KBR is a private military, engineering, and construction company based in Houston. It was formed in 1998 when Halliburton subsumed Dresser Industries and amalgamated Dresser subsidiary The M. W. Kellogg Co with its own subsidiary Brown & Root. KBR has worked in countries like Cuba, Kosovo, and Afghanistan; currently its American workforce comprises 14,000 people in Iraq. It is also said to have the biggest U.S government contract there – beating out all other Iraq-based companies.

KBR, a multinational military and commercial contracting firm, declared in 2008 that it was purchasing BE&K, an Alabama-based company. In 2011 KBR earned $540 million from its operations. And today the company employs over 27,000 people in over 70 countries across Europe, the Americas, Africa, Asia Pacific Rim regions including Australia and the Middle East. Despite controversies from time to time – such as allegations of sexual assault lodged by employees – KBR has enjoyed a long history of success overall.

23. Corps Security

The Corps of Commissionaires, formerly known as the Corps Security, is a British security company that reports to Queen Elizabeth II. The company has about 3,000 security personnel and twelve offices throughout the U.K. Its specialty is corporate security – including event protection, electronic surveillance, and consulting.

Corps Security is a leading supplier of specialist security solutions, and its event protection unit secures high-profile sporting events like Wembley Stadium and important annual affairs such as the London Lord Mayor Show. Other services include manned guarding, CCTV surveillance, alarm response, and key holding.

24. Defion Internacional

Defion International is a private military company headquartered in Lima, Peru. The company specializes in providing specialized security staff who are recruited mostly from Latin America. These personnel are often then contracted out to other companies; in fact, Defion Internacional first became known when it trained recruits for Triple Canopy during the Iraq War. Defion International has bureaus throughout Sri Lanka, the Philippines, Iraq, and Dubai and specializes in training bodyguards, drivers/logistics personnel ,and administrative personnel.

Latin American security staff stationed in the Middle East have been described as “guns for hire.” Alejandro Fernandez, Defion Internacional’s administrative manager, explained that Peruvians are used to dealing with violence and disruptions due to lack of basic services in Lima.

25. ICTS Europe

ICTS Europe is an independent security firm that specializes in providing protection solutions for transportation and public safety industries. It offers rail, corporate, and energy protection services, but its specialty is airport and airline security. Additionally, ICTS Europe has capabilities in technology and “global solutions” areas. As of 2019, the company works with more than 250 rail companies, businesses such as education and health institutions around the world, aviation organizations such as airlines and airports across Europe, Middle East regions including North Africa/Middle East/South Asia (NAMSA), Latin America/Caribbean (LAC), South Asia Region including Afghanistan & Pakistan (SAARC) countries; as well as European Union countries.

ICTS Europe is highly respected in the aviation sector for its innovative approach to problem solving and its capability to think outside the box when addressing unique operational challenges. Its clients include Air France, Emirates, Etihad Airways, British Airways, and major airports like London’s Gatwick and Heathrow. In 2012 ICTS Europe brought in $479.072 million in revenue.

26. Chubb Fire & Security

Charles and Jeremiah Chubb, the founders of Chubb Fire & Security, established their company in 1818. In that same year they patented their Chubb detector lock, which was designed to prevent robberies at banks. At the time, America was experiencing a wave of violent bank robberies, so Chubb responded by producing a time lock to be attached to the doors of vaults and safes. In 2000, however, Chubb sold its lock division and focused exclusively on security systems.

Since 2003, United Technologies Corporation has owned the company, which today provides services around the world. In the U.K., these services include mobile patrols, remote surveillance and response, and key holding. Meanwhile in South Africa, Chubb911 offers armed response teams and electric fencing as well as a 24-hour emergency hotline. In Australia, United Technologies Corporation also offers cash-in-transit services.

27. Asia Security Group

Asia Security Group is a private security company that, according to its LinkedIn profile, offers consulting services and manpower support to government and corporate clients in Afghanistan. The company has branches in Kabul, Mazar-e-Sharif, Jalalabad, and Kandahar and boasts a team of licensed armed troops who promise comprehensive security solutions tailored to the needs of their clients.

Asia Security Group has worked with the U.S. military in Afghanistan, providing security for supply convoys in volatile areas of the country. In addition, ASG personnel have partnered with DynCorp, an American private military company, to provide risk assessment and management services as well as business development assistance.

28. Erinys International

Erinys International has a head office in Cyprus and branches in the United Kingdom, South Africa, the Republic of Congo, and the Democratic Republic of Congo. The company specializes in mineral extraction, oil and gas exploration, public sector security operations, and NGO development. It also offers infrastructural development services to its clients.

Erinys International is a British-based company that operates in Africa and the Middle East. The firm was founded in 2001 by former British soldier Jonathan Garratt, and it added South Africa to its list of locations in 2002. Erinys has worked with the Iraqi Ministry of Oil, training and supplying a 16,000-strong “Oil Protection Force” guarding 282 sites.

29. TSU Protection Services

Chris Beukes founded TSU Protection Services in 1999, and it now claims to be one of South Africa’s top private security firms. “I saw a need in the market for specialized protection services, such as executive protection and higher risk work, which few companies were offering at the time due to the lack of trained personnel,” said Beukes. “As a former police officer with experience in this field, I knew that I could create a company that would meet this needs perfectly. Thanks to our dedication to quality service and training our employees properly, we have since become one of South Africa’s leading private security firms.

With a team of highly-trained operatives, the company provides high-profile businesses and other clients with armed personal escorts, executive protection and support, crowd control, and maritime security.

30. International Intelligence Limited

International Intelligence Limited is a British firm that specializes in counter-espionage and investigations. Alex Bomberg, who formerly served as an aide to the British Royal Family, founded the company in 2002. It offers private investigation, technical surveillance counter-measure, intelligence gathering and other services related to countering espionage.

Employees at International Intelligence Limited come from a variety of backgrounds, including law enforcement, military intelligence, financial investigation and intelligence. Specialists within the company include experts in computer forensic analysis, financial forensics and satellite tracking.

31. Unity Resources Group

Unity Resources Group, an Australian firm, was founded in 2000. The company has a primarily Antipodean staff, but its head office is in Dubai, UAE. Unity Resources Group provides crisis management and other services in difficult environments. It describes itself as reliable and trustworthy solutions provider of land, sea and air services to complex areas lacking infrastructure support.

Unity Resources Group operates in a number of different regions around the world, employing over 1,200 people. In 2007, some of its employees were involved in a controversial incident in Baghdad where two civilians were killed. However, Unity Resource Group defended the conduct of its employees and stated that they acted within their authority.

32. Senaca Group

The Senaca Group is a private security firm with operations in many different sectors. It has subdivisions that include Senaca Guarding, Senaca Cash Management Services, Senaca Training, and Integrated Risk Management Services. The company works in the oil and gas, transport and logistics, financial services, tourism industry, government organizations such as law enforcement and health care providers, property management companies such as real estate developers or hotel ownerships/operations directorships etc., maritime businesses including shipping lines or ports operators etc., energy companies such as renewable power plants or shale gas extraction operations etc., NGO’s (non-governmental organizations) working on various issues like human rights protection or environmental conservation etc., and finally policing organizations performing tasks like border control or riot control.

The Senaca Group offers a range of Integrated Risk Management Services, including guards, patrols, corporate security, alarm response and key holding. In addition to these services, the Senaca Group also specializes in the transportation of money through its subsidiary company Seneca Cash Management Services. At the same time, there is a subsidiary company called Seneca Tech that offers surveillance and “access control solutions” technology. Former Irish Army Special Forces major Jim Farrell and security veteran Terry Downes founded the Senaca Group in 2009 together with other partners.

33. The Brink’s Company

The Brink’s Company is based in Virginia, but operates in over 100 countries with a staff of nearly 70,000. Perry Brink established the company in 1859 and began using a horse-drawn wagon to move customers’ suitcases from local railroad stations to hotels. In 1891, the company made its first cash-in-transit delivery transporting half a dozen bags filled with silver dollars.

Brink’s has a long history of providing security services to businesses and governments. In recent years, it has expanded its offerings to include insurance coding and data entry, cash management, and airport security. In 2011 Brink’s brought in $3.9 billion in revenue.

34. CACI International

CACI International was founded in Santa Monica, California in 1962. The company changed its name to reflect its Consolidated Analysis Center, Incorporated status in 1967 and officially became known as CACI International in 1973. Today, the company has more than 120 branches across the United States and Europe and employs around 15,000 people.

CACI International provides technology solutions and services to support national security missions and government transformation. In 2012, the company’s revenue was $3.8 billion. CACI International specializes in information technology, providing support for intelligence, defense, and federal civilian customers.

35. Booz Allen Hamilton

Edwin G. Booz, James L. Allen, and Carl L. Hamilton founded the company in 1914, and since then it has grown to be one of the largest U.S.-based technology consulting firms with revenues totaling over $5 billion in 2012. The company offers a variety of services including engineering, management consulting, and technology work but also operates as a defense contractor for the government sector .

The company provides trusted consulting and professional services to civilian and government institutions in a variety of sectors. It has worked with the U.S. Army, Air Force, Navy, Marine Corps, as well as defense organizations and space agencies.

36. Control Risks

Control Risks is a professional services and consulting firm that has offices in 36 countries around the world. The company’s focus is on helping organizations manage political, integrity, and security risks in complex and hostile environments. Control Risks began as a division of insurance firm Hogg Robinson in 1975.

In the 1990s, major companies around the world began branching out into areas that were previously less explored. This led to Control Risks developing its intelligence and investigation services, which it boasts provide “strategic consultancy, expert analysis, and in-depth investigations through to handling sensitive political issues and providing practical on-the-ground protection and support.” In 2010 control risks generated $223.32 million in revenue.

37. GardaWorld

GardaWorld is a private security company with headquarters in Montreal, Quebec. It employs around 45,000 people worldwide and provides services to 140 cities across North America, Europe, Africa, Asia Pacific and Latin America. The international protective services department of the company aims to safeguard “clients in complex and emerging markets.”

GardaWorld is one of the world’s largest providers of cash management services, processing $5 billion a day. In August 2013, GardaWorld acquired G4S’ Canadian cash management division for an estimated value of $110 million.

And in December 2013 GardaWorld agreed upon a 12-year cash management deal with Bank of America valued at $1.4 billion. At the end of April 2012, GardaWorld’s quarterly revenue totaled some $300 million.

38. DynCorp

The history of Annandale, Virginia-based private military contractor DynCorp stretches back to 1951 when Land-Air, Inc. was obtained by California Eastern Airways to form what would become California Eastern Aviation, Inc. In 1962 the company was renamed Dynalectron Corporation, which was renamed DynCorp in 1987. DynCorp’s services include security, aviation support, intelligence, and contingency ops.

The firm’s yearly revenue exceeds $3 billion, and over 96 percent of that figure is generated by U.S. government contracts. DynCorp has provided support for the U.S. forces in countries like Peru, Colombia, Somalia, Kosovo, Kuwait, Bolivia, Angola, and Haiti. The company was also called in to help with recovery action in Louisiana and the surrounding regions in the wake of Hurricane Katrina.

39. AlliedBarton

Allied Barton is a private security company with over 55,000 employees in 120 offices across the USA. The company is one of the biggest U.S.-owned security officer businesses and its services are available to businesses of all sizes.

The company has a diverse range of clients, including universities, commercial buildings, aerospace and defense sites, housing complexes, malls, healthcare facilities, and chemical plants.

Since its inception in 2012, AlliedBarton has hired veterans and military personnel to bolster its security staff. The company specializes in providing local response and national support, with annual revenue exceeding $1.9 billion in 2013.

40. ADT

ADT Corporation was founded in 1874 and is one of the most well-known alarm monitoring companies in America. The company operates in over 35 countries around the world, providing security services to homes and businesses. In South Africa, ADT provides armed response teams and 24/7 surveillance to its customers.

ADT was originally known as American District Telegraph. It started out as a telegraph delivery business, but in 1910, under new leadership from AT&T, it shifted its focus to other areas such as fire and intruder alarms. In 2011 ADT boasted an estimated 6.4 million customers and a yearly turnover of $3.1 billion on the New York Stock Exchange as an independent company.

41. Securitas AB

Securitas AB is a global security company with head offices in Stockholm. In 2012, it had around 300,000 workers spread out over 53 countries and annual revenue of over $10 billion. Its services include guards and patrols, investigations, home alarm systems, loss prevention, security consulting, and guard dog supply.

Security Services Europe, Security Services Ibero-America, and Security Services North America each operate a variety of security services to help facilitate cash-in-transit. These services include specialized vehicles with metal safes as well as a bulletproof jeep fleet.

42. G4S

G4S describes itself as the world’s leading security and outsourcing group, specializing in outsourcing of business processes in sectors where safety and security risks are considered a strategic threat. It was founded in 2004 when London-based company Securicor amalgamated with Danish business Group 4 Falck.

G4S is a multinational corporation with more than 620,000 employees. The company has a range of services including the provision of security personnel and monitoring equipment. G4S also works with governments overseas to deliver security measures.