What are the major US defense services companies?

Five major US defense services: (1) Leidos (LDOS) — largest, diversified defense, intelligence, civil, health; (2) Booz Allen Hamilton (BAH) — defense, intelligence, civil services with AI integration leadership; (3) SAIC (SAIC) — defense IT plus intelligence plus civil; (4) CACI International (CACI) — intelligence community focus plus electromagnetic warfare; (5) ICF International (ICFI) — federal civil plus state-and-local plus international consulting.

How do DoD contract cycles work?

Multi-year DoD prime contracts (typically 5-10 year base periods plus options) drive revenue trajectory. Multi-year recompete cycles plus emerging new contract awards drive operator economics. Multi-year backlog disclosure plus quarterly book-to-bill ratios drive multi-quarter visibility. Major contract awards plus emerging recompete cycles produce dramatic operator-specific revenue dynamics. Reading contract award activity drives institutional positioning.

How does AI integration affect defense services?

Multi-year AI integration into defense IT services plus emerging cybersecurity services drives new opportunity sets. AI-enabled command, control, communications (Joint All-Domain Command and Control), autonomous systems, decision support, plus intelligence analysis drive multi-year demand. Multi-year AI capability development plus emerging contract awards drive operator positioning. Booz Allen Hamilton particularly leads AI integration positioning.

What is intelligence community contracting?

Intelligence community contracting includes services for CIA, NSA, NGA, NRO, plus emerging Defense Intelligence Agency (DIA), Office of the Director of National Intelligence (ODNI). Multi-year intelligence community contracts drive Booz Allen Hamilton, SAIC, CACI International economics. Multi-decade intelligence services franchise plus emerging cyber intelligence plus space intelligence drive growth. Reading intelligence community award disclosure drives positioning.

How does Leidos's scale advantage work?

Leidos operates largest US defense services scale post-Lockheed Martin Information Systems & Global Solutions acquisition (2016) plus subsequent M&A activity. Multi-year scale enables broader contract pursuits plus emerging cross-customer opportunities plus selective capital allocation. Multi-segment diversification (defense, intelligence, civil, health) provides cross-cycle stability. Concentrated active manager LDOS positions reflect scale leader thesis.

What signals defense services cycle inflections?

Four signals: (1) DoD budget plus appropriations actions affecting contract awards; (2) major recompete plus new contract award activity; (3) AI integration plus emerging technology investment; (4) capital allocation including M&A activity. Concentrated 13F changes around these signals reveal manager cycle reading.

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Defense Services 13Fs: Leidos, Booz Allen, SAIC, CACI Decoder

Leidos, Booz Allen Hamilton, SAIC, CACI International, and ICF International anchor US defense services 13F positioning. Multi-year DoD contract cycles, AI plus cybersecurity integration, intelligence community spending, and capital allocation drive distinctive institutional patterns.

By Sarah Mitchell, Education Editor

PublishedMay 16, 2026UpdatedMay 16, 2026

US defense services equities form a distinctive government-services corner of institutional 13F positioning. Leidos, Booz Allen Hamilton (BAH), SAIC (SAIC), CACI International (CACI), and ICF International (ICFI) anchor the cohort. Multi-year DoD contract cycles, AI plus cybersecurity integration, intelligence community spending dynamics, and capital allocation discipline drive distinctive institutional patterns. Reading defense services 13F positioning requires understanding the DoD-contract framework plus the multi-year AI-and-intelligence cycle dynamics.

The defense services business model

Defense services face four primary economic drivers:

DoD contract cycles. Multi-year DoD prime contracts plus emerging recompete cycles drive revenue trajectory. Multi-year backlog plus award activity drives multi-quarter visibility.
AI plus cybersecurity integration. Multi-year AI integration into defense IT services plus emerging cybersecurity services drive new opportunity sets. AI-enabled command, control, communications drive multi-year demand.
Intelligence community spending. Multi-year intelligence community (CIA, NSA, NGA, NRO) contractor revenue drives Booz Allen plus SAIC plus CACI economics.
Capital allocation. Multi-year disciplined buyback plus selective M&A drive operator economics.

Major US defense services names

Leidos (LDOS)

Largest US defense services contractor (post-Lockheed Martin IT separation, plus emerging acquisitions). Diversified across defense, intelligence, civil, health. Multi-year operational scaling plus capital allocation.

Booz Allen Hamilton (BAH)

Diversified across defense, intelligence, civil services. Multi-year AI integration leadership plus capital deployment. Multi-decade consulting heritage plus emerging emerging technology services.

SAIC (SAIC)

Diversified defense IT plus intelligence community plus civil services. Multi-year operational scaling.

CACI International (CACI)

Intelligence community focus plus emerging electromagnetic warfare plus broader defense services. Multi-decade intelligence services franchise.

ICF International (ICFI)

Diversified across federal civil plus state-and-local plus international consulting. Multi-segment professional services.

How institutional managers position around defense services

Three patterns:

Pattern 1: Scale-leader concentration

LDOS-concentrated active manager positions reflect scale leadership plus diversified franchise thesis.

Pattern 2: AI-integration positioning

BAH-concentrated active manager positions reflect AI integration plus consulting franchise thesis.

Pattern 3: Intelligence-community positioning

CACI-concentrated active manager positions reflect intelligence community focused thesis.

How to read defense services 13F positioning

Three rules:

Rule 1: Identify customer mix

DoD vs intelligence community vs civil services have distinct cycle dynamics.

Rule 2: Watch contract awards

Quarterly contract awards plus backlog drive multi-quarter visibility.

Rule 3: Cross-check AI integration

Multi-year AI integration drives emerging opportunities.

What defense services positioning signals

Scale-leader conviction. Concentrated LDOS positions signal scale leader thesis.
AI-integration conviction. Concentrated BAH positions signal AI integration thesis.
Intelligence-community conviction. Concentrated CACI positions signal intelligence focus thesis.

For real-time tracking of defense services 13F activity, see the institutional signals feed.

Sarah MitchellEducation Editor

Investment Education Editor at 13F Insight. Breaks down complex institutional data into actionable insights for individual investors.