Leidos
Leidos is a major U.S.-based technology, engineering, defense, intelligence, health, and national-security company headquartered in Reston, Virginia. The company supports government and commercial customers with advanced digital systems, cybersecurity, mission software, defense technologies, health services, energy-infrastructure solutions, space and maritime technologies, and large-scale systems integration. Its customers include U.S. federal agencies, defense and intelligence organizations, public-health institutions, critical-infrastructure operators, and allied governments.
The modern Leidos organization traces its corporate history to Science Applications International Corporation, founded in 1969. In September 2013, the company separated into two publicly traded businesses. The legacy organization changed its name to Leidos Holdings, Inc., while a separate business continued under the SAIC name. Following the separation, Leidos relocated its headquarters to Reston, Virginia. The company later expanded significantly, including through its 2016 combination with Lockheed Martin’s Information Systems & Global Solutions business.
Today, Leidos is publicly traded on the New York Stock Exchange under ticker LDOS and is led by Chief Executive Officer Thomas A. Bell. The company reported approximately $17.2 billion in fiscal 2025 revenue and currently describes its workforce as approximately 50,000 employees globally, reflecting recent growth from the 47,000 figure disclosed at the start of 2026. Its NorthStar 2030 strategy centers on defense technology, managed health, digital infrastructure and cyber, energy resilience, and mission software.
Leidos Holdings, Inc.
1750 Presidents Street
Reston, VA 20190
United States
Leidos’ current SEC filings and Investor Relations materials identify 1750 Presidents Street in Reston as the company’s principal executive office. The address should be used as the current headquarters rather than older SAIC-era locations.
Leidos’ principal corporate office is the same as its headquarters
1750 Presidents Street
Reston, VA 20190
The facility supports executive leadership, investor relations, corporate finance, governance, strategy, legal, communications, and other enterprise functions.
Leidos does not prominently publish a separate universal corporate mailing address for routine public correspondence.General corporate correspondence can be directed to the current Reston headquarters unless a specific Leidos department provides a separate address.
For individual shareholder matters, Leidos uses its transfer agent
Computershare
P.O. Box 505000
Louisville, KY 40233-5000
Courier delivery
462 South 4th Street, Suite 1600
Louisville, KY 40202.
Leidos previously operated under the Science Applications International Corporation name before the 2013 corporate separation.After the SAIC split, Leidos moved its corporate headquarters to Reston, Virginia. Older SAIC addresses should not be treated as the current Leidos headquarters.
571-526-6000
This is the current corporate telephone number listed in Leidos SEC filings for its Reston headquarters.
Leidos does not operate a single consumer-style Customer Service line because most of its work is performed under government, defense, health, infrastructure, and commercial contracts.Customers should use the contact assigned to their Leidos program, contract, product, or service.
1750 Presidents Street, Reston, VA 20190
1750 Presidents Street, Reston, VA 20190
Investor Relations: ir@leidos.com
Media Relations: mediarelations@leidos.com
Leidos does not publish one universal public support email for every customer or contract.
Defense, Information Technology, Cybersecurity, Engineering, Health, Digital Modernization, National Security and Critical Infrastructure
Corporate roots
1969
Leidos name adopted after the 2013 SAIC separation.
Current company materials report approximately
50,000 employees worldwide.
Fiscal 2025
Approximately $17.2 billion.
Leidos does not publish public walk-in hours for its Reston headquarters.Business visitors should schedule an appointment with the relevant department before visiting.
Investor Relations
Careers
Leidos designs, develops, integrates, and supports defense systems across airborne, ground, maritime, space, missile-defense, and other mission environments. Its work includes advanced platforms, sensors, mission technologies, autonomous systems, and rapid prototyping for U.S. and allied warfighters.
Leidos helps government and commercial organizations modernize aging technology environments through cloud migration, secure digital infrastructure, software modernization, systems integration, and enterprise-scale digital transformation. These services support customers operating complex or mission-critical systems.
Leidos provides offensive and defensive cyber capabilities, cyber operations, threat analysis, secure infrastructure, identity management, and other cybersecurity services. Its work frequently supports high-security defense, intelligence, federal, and critical-infrastructure environments.
Mission software is one of Leidos’ core NorthStar 2030 growth areas. The company develops and integrates software that supports command, operations, decision-making, logistics, intelligence, defense, transportation, and other highly specialized missions.
Leidos delivers managed health and healthcare technology services for government customers, including programs supporting military personnel, veterans, public-health agencies, and other populations. The company combines technology, clinical-support systems, and large-scale program management.
Leidos supports public-health research, health-data systems, life sciences, and related government health programs.
Its capabilities can include health information technology, analytics, scientific support, clinical research, and secure data environments.
Leidos provides engineering, grid modernization, power-delivery, infrastructure planning, and energy-system services.Energy resilience is one of the company’s current strategic growth areas under NorthStar 2030.
The company supports airports, transportation systems, energy infrastructure, public-sector networks, and other mission-critical physical and digital environments.Services can include modernization, resilience, engineering, cybersecurity, and technology integration.
Leidos develops technology for space and missile-defense missions, including software, sensors, engineering, integration, and mission support.Space and maritime technology is a central part of the company’s strategic growth plan.
Leidos develops maritime technologies including autonomous systems, undersea capabilities, sensing, mission software, and related engineering services.The company supports both military and security-focused maritime missions.
Leidos develops integrated technologies supporting air defense, missile detection, command-and-control, and related national-security missions.These capabilities can combine sensors, analytics, software, and advanced hardware.
Leidos provides technology and mission support to U.S. intelligence organizations.Capabilities include secure digital infrastructure, analytics, cyber operations, mission software, logistics, and intelligence-related technical services.
Leidos supports homeland-security missions through digital systems, cyber capabilities, mission technology, analytics, transportation-security support, and infrastructure modernization.Its customers include agencies responsible for national security and public safety.
Leidos provides airport modernization, air-traffic-related technology, and transportation-system solutions.
Its recent portfolio changes have included security-screening operations through partnerships and joint ventures.
Leidos supports military and government customers with logistics, supply-chain, systems sustainment, maintenance, training, and operational support.These services help keep complex mission systems functioning over long operating lifecycles.
Leidos integrates artificial intelligence into mission software, cyber operations, analytics, defense systems, healthcare, and other technology environments.The company lists trusted mission AI among its strategic technical capabilities.
571-526-6000.
571-526-6000
571-526-6000
571-526-6000
Leidos does not publish one universal consumer Customer Service number.Contract customers should use their designated Leidos program, account, service desk, or project contact.
No single company-wide external support line applies to all Leidos programs.Technical support numbers vary by customer, contract, system, and service.
No universal toll-free corporate Customer Service number is prominently published.
Leidos does not publish one universal sales number covering all defense, health, energy, and technology services.Prospective customers can use the official Contact Us form.
Leidos does not publish a public universal billing number.Contract billing is normally handled through the relevant program, contracting, finance, or accounts-payable channel.
Leidos operates offices in numerous U.S. and international locations.Regional numbers vary by facility and program.
No single branch-office number applies across Leidos’ global footprint.
Leidos does not publish one universal international corporate-support number.
Leidos does not publish a general customer emergency hotline.For ethics-related concerns, the Leidos Helpline operates 24/7.
855-753-4367
This line is administered through an independent third party and can be used to report certain ethics, compliance, misconduct, or grievance concerns.
Leidos’ public Investor Relations page primarily publishes
ir@leidos.com
Individual shareholders can contact Computershare at
855-894-5367
International
201-680-6961.
For urgent media matters outside normal monitoring hours:
571-926-3822
mediarelations@leidos.com.
Leidos does not publish one universal applicant HR phone number.
Employment and accommodation questions should use
https://www.leidos.com/contact
or the official Leidos careers platform.
Not applicable.
Leidos is a technology, defense, engineering, and government-services company.
For a general corporate matter, call 571-526-6000 and ask to be routed to the appropriate Reston headquarters department. Because Leidos is primarily a government and business-to-business contractor rather than a consumer company, callers should be prepared to identify the relevant contract, customer organization, business sector, program name, facility, or Leidos employee they are trying to reach. This information can significantly improve routing.
For contract-specific issues, the better route is usually the designated program manager, technical support team, contracting officer interface, or Leidos service desk connected with the relevant project. Investor questions should go to ir@leidos.com, shareholder-account issues to Computershare, and media inquiries to mediarelations@leidos.com. Employment-related questions and disability-accommodation requests should be submitted through the official Contact Us process.
If a caller’s concern involves ethics, misconduct, fraud, retaliation, human trafficking, or compliance rather than ordinary customer service, the correct specialized route is the Leidos Helpline at 855-753-4367. The company states that the helpline is operated by a third party, is available around the clock, and supports anonymous reporting where permitted by law.
Complaints involving Leidos can range from contract performance, supplier issues, employment concerns, recruitment scams, billing, ethics, cybersecurity, government-contract compliance, or interactions with a specific Leidos program. Before escalating, gather the relevant contract or program name, dates, Leidos contacts, invoices or correspondence, screenshots, case numbers, and a clear written timeline.
If the complaint relates to a specific Leidos contract, platform, or service, start with the customer-facing support contact assigned to that program. For general corporate routing, call 571-526-6000. Explain the issue clearly, identify the affected program or business sector, and ask that the matter be documented and routed to the appropriate responsible team.
Escalate directly to the department that owns the issue. This may be program management, contracting, cybersecurity, health services, engineering, finance, careers, procurement, investor relations, or another specialized team. Provide the original complaint history and all supporting documentation so the department does not have to reconstruct the issue from the beginning.
If the first department contact cannot resolve the matter, request review by a program manager, account leader, functional manager, sector leadership representative, or another appropriate supervisor. Ask for a written acknowledgment where possible and keep the names, titles, dates, and responses associated with the escalation.
Leidos’ official Contact Us page provides written routing for corporate inquiries, career questions, accessibility requests, and other issues. A written complaint is helpful when the matter requires attachments, a detailed timeline, or a record of previous communication. Use the official contact form and retain a copy or screenshot of the submission.
For serious unresolved corporate matters, write to Leidos Holdings, Inc., 1750 Presidents Street, Reston, VA 20190. Include your name, contact details, relevant project or account information, earlier complaint history, and a clear description of the requested resolution. Send copies rather than original evidence and use a trackable delivery method when appropriate.
For ethics, compliance, misconduct, retaliation, fraud, or similar concerns, use the Leidos Helpline at 855-753-4367 or its online ethics-reporting channel. Leidos states that the helpline is operated independently and supports confidential or anonymous reporting where legally allowed.
The correct regulator depends on the nature of the issue. Government-contract concerns may involve the contracting agency, agency Inspector General, Department of Defense oversight, or another federal body. Securities or shareholder issues can involve the SEC. Employment complaints may fall under the EEOC, Department of Labor, or relevant state agency.
Leidos is not primarily a retail consumer company, so consumer-protection routes will only apply to certain transactions. If the dispute involves a commercial payment, service purchase, recruitment scam, or other consumer-style matter, affected individuals may consider the FTC, state Attorney General, financial institution, or payment provider depending on the facts.
If internal and regulatory channels do not resolve a serious contractual or legal dispute, review the agreement governing the relationship. Government contracts, supplier agreements, employment agreements, and commercial contracts may contain specific dispute-resolution, mediation, arbitration, or litigation provisions. Obtain qualified legal advice before taking formal action.
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