Top Managed IT Companies in St. Louis

SSE (Systems Service Enterprises Inc.)

Founded in 1966 by Susan S. Elliott, a former IBM employee

✓ Verified Provider ⭐ 4.4/5 Stars Est. 1966
St. Louis, MO
250+ employees
Founded 1966
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SSE (Systems Service Enterprises Inc.) is a managed IT services provider based in St. Louis, MO, operating since 1966. Across 10 verified Google reviews it averages 4.4 out of 5, a public track record you can weigh during diligence. It focuses on Managed IT Services, Cybersecurity, Cloud Services, Compliance & Risk. Compare it against other St. Louis managed IT providers, then request a quote.

Vetted by the Best IT MSP editorial team · Last updated June 2026

About SSE (Systems Service Enterprises Inc.)

SSE, founded in 1966, is a Midwest-based MSP specializing in managed IT, cybersecurity, and CMMC/NIST 800-171 compliance services for organizations in the Defense Industrial Base, ranked 56th among the world's top 501 MSPs.

Services Offered

🖥️
Managed IT Services
🔒
Cybersecurity
☁️
Cloud Services
Compliance & Risk
🪟
Microsoft 365
🤝
Co-Managed IT

Industries Served

🏭 Manufacturing

Why Choose SSE (Systems Service Enterprises Inc.)

4.4/5 From 10 Google Reviews

With 10 reviews averaging 4.4, SSE (Systems Service Enterprises Inc.) has a checkable public track record rather than marketing claims alone.

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Based in St. Louis

SSE (Systems Service Enterprises Inc.) is headquartered in St. Louis, MO, so St. Louis businesses get a local team for on-site work instead of a distant call center.

Founded in 1966 by Susan S. Elliott, a former IBM employee

Founded in 1966 by Susan S. Elliott, a former IBM employee

Ranked 56th out of 501 MSPs worldwide

Ranked 56th out of 501 MSPs worldwide

Location

St. Louis, MO

Certifications & Compliance

CMMC Level 2 Certified
CMMC Registered Provider Organization (RPO)

Frequently Asked Questions

What do SSE (Systems Service Enterprises Inc.) reviews say?

Across 10 verified Google reviews, SSE (Systems Service Enterprises Inc.) averages 4.4 out of 5. Weigh that public track record alongside a direct quote.

Which IT services does SSE (Systems Service Enterprises Inc.) provide?

SSE (Systems Service Enterprises Inc.) delivers Managed IT Services, Cybersecurity, Cloud Services, Compliance & Risk, Microsoft 365, Co-Managed IT to organizations across St. Louis, MO.

What area does SSE (Systems Service Enterprises Inc.) serve?

SSE (Systems Service Enterprises Inc.) is based in St. Louis, MO and supports businesses across St. Louis and the greater metro area.

When did SSE (Systems Service Enterprises Inc.) start?

SSE (Systems Service Enterprises Inc.) has been operating since 1966.

Is SSE (Systems Service Enterprises Inc.) certified?

SSE (Systems Service Enterprises Inc.) carries CMMC Level 2 Certified, CMMC Registered Provider Organization (RPO).