These Alexandria-based companies are primarily professional services firms, many of which specialize in serving government and national security sectors. The list includes a mix of large established firms and mid-sized companies. Modern Technology Solutions, Inc. (MTSI) is an employee-owned engineering company offering technology solutions in areas like missile defense and cybersecurity. Systems Planning & Analysis provides analytical insights for national security programs. DCS Corp delivers advanced technology and management solutions to national security agencies, while Kearney & Company specializes in government financial management services.
A significant number of these firms, such as Systems Planning & Analysis and DCS Corp, focus on defense and space manufacturing or related government administration, indicating a strong cluster of companies supporting national security objectives. CALIBRE Systems, Inc. offers management consulting and digital transformation to government and industry clients. Cotton is an audit and accounting firm. The presence of companies like Culmen International, a global provider of technical and logistics services, also highlights a focus on international affairs and global operations.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Modern Technology Solutions, Inc. (MTSI)mtsi-va.com
Employee-owned engineering company providing technology solutions in areas such as missile defense, cyber security, intelligence, aviation, and homeland security |
2,308 | |||
| 2 |
Systems Planning & Analysisspa.com
Provides rigorous, objective analytical insights and innovative solutions for critical national security programs supporting US and Allied missions. |
2,242 | |||
| 3 |
DCS Corpdcscorp.com
Provides advanced technology and management solutions to national security government agencies, emphasizing customer satisfaction and mission success. |
2,043 | |||
| 4 |
Kearney & Companykearneyco.com
A leading CPA firm specializing in government financial management services to enhance operations, compliance, accountability, and prevent fraud |
1,061 | |||
| 5 |
CALIBRE Systems, Inc.calibresys.com
A management consulting and digital transformation company serving government and industry clients with enduring solutions for management, technology, and program challenges |
784 | |||
| 6 |
Cottonsikich.com
A specialized audit and accounting firm offering financial, IT, and management consulting services, with a focus on work-life balance and professional excellence |
434 | |||
| 7 |
Systems Planning and Analysis, Inc. (MCR LLC acquired by SPA in 2021)spa.com
Providing objective analysis and solutions for national security objectives, evolving to meet client needs in defense, homeland security, and energy sectors |
396 | |||
| 8 |
Culmen Internationalculmen.com
Global provider of technical, management, humanitarian assistance, and logistics services with extensive experience operating in over 140 countries on six continents |
384 | |||
| 9 |
MPR Associates, Inc.mpr.com
An engineering and management services firm founded by naval nuclear propulsion engineers, delivering excellence in various markets globally for almost 60 years |
383 | |||
| 10 |
Robbins-Gioiateamrg.com
The company focuses on improving depot planning and scheduling to enhance utilization, throughput, and readiness for the present and future #FutureReadinessToday |
348 | |||
| 11 |
Mayvin, Inc.mayvin.com
Innovative culture, inclusive work environment, ongoing career development, and dedication to protecting national security with unwavering dignity and respect #PeopleMatter |
341 | |||
| 12 |
ALFANAR for Recruitment شركة الفنار للتوظيف
A recruitment company providing comprehensive services and solutions to meet all your needs (19 words) |
339 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 13 |
Patriot Enterprises LLCpatriotenterprisesllc.com
Providing outstanding program support to military and government organizations globally |
338 | |||
| 14 |
Planate Management Groupplanate.com
Global provider of facilities engineering and management consulting services, specializing in responsive technical solutions for clients in various environments worldwide |
302 | |||
| 15 |
Pinakipinakitech.com
Global IT services integrator offering solutions in e-finance, mobile, ERP, staffing, RPO, and more Award-winning recruitment services with expertise in business domains |
244 | |||
| 16 |
JB Management, Inc. (JBM)gojbm.com
A Veteran Owned Small Business providing programmatic, planning, operations, maintenance, training, system integration, engineering, and information operations services worldwide |
185 | |||
| 17 | 183 | ||||
| 18 |
Mekanicmekanic.com
A full-service agency specializing in branding, digital marketing, experience design, and advertising to help organizations grow and succeed |
95 | |||
| 19 |
Soft Scribe LLCsoftscribellc.com
Integrated solutions provider specializing in Social Media Management, Transcription, Bookkeeping, Accounting, and Data Analytics, delivering cost-effective, reliable, and timely services nationwide |
25 | |||
| 20 |
World Services LLC of Virginiawsllc.com
Providing a wide range of IT services including management consulting, cloud architecture, software development, data science, testing, and cybersecurity for various government and commercial clients |
22 | |||
| 21 |
Ashley Cooperacrg.com
Global strategic advisory and consulting firm offering independent advice, data analytics, valuations, investigations, transaction advisory, and regulatory consulting to various industries worldwide |
20 | |||
| 22 |
Halt, Buzas & Powell, Ltdcpas4you.com
Top-rated accounting and advisory firm in Virginia and Maryland, providing expert financial services, personalized strategies, and building lasting client relationships |
14 | |||
| 23 |
Motley Fool Venturesfoolventures.com
Venture capital firm based in Alexandria, VA, investing in early-stage tech companies to create competitive advantages, with a focus on providing value beyond capital |
12 | |||
| 24 |
Friedman Grimes Meinken & Leischner PLLColdtownlawyers.com
A full-service law firm offering expertise in family law, business law, civil litigation, criminal defense, estate planning, personal injury, and more |
9 | |||
| 25 |
473 Group473group.com
Global research and strategy consulting firm specializing in risk management and procurement, providing effective solutions for businesses worldwide with confidentiality and privacy |
5 | |||
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How this list is built
Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 12, 2026.
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