SIEM Cost by Organization Size: From Startup to Enterprise
"How much does a SIEM cost?" depends almost entirely on your organisation's size. A 50-person startup and a 10,000-person enterprise face the same SIEM market but with wildly different economics. This guide provides clear pricing bands, vendor recommendations, and budget planning guidance for every organisational tier.
SIEM Cost Overview by Size Band
Small Business
Mid-Market
Enterprise
Large Enterprise
All ranges include licensing, infrastructure, storage, and staffing costs. The wide variance within each band reflects different vendor choices, deployment models, and retention requirements. Use our multi-vendor calculator for personalised estimates.
Small Business: Under 100 Employees
$12,000 - $60,000/yrRecommended Vendors
Managed SIEM (Blumira, Arctic Wolf)
24/7 monitoring without hiring. Best value for organisations without security staff.
Microsoft Sentinel
Cheapest self-managed option for Microsoft shops. Free M365 data keeps costs minimal.
Wazuh (open-source)
Zero licensing cost. Only viable if you have an engineer with Elastic/Linux experience.
At this scale, staffing is the dominant cost factor. One security analyst costs $85,000-$130,000 per year -- more than the SIEM licensing for most vendors. Managed SIEM at $3,000-$5,000/month provides equivalent or better coverage without the staffing commitment. Self-managed SIEM only makes financial sense if you have an existing IT team member who can dedicate 20-30% of their time to SIEM operations.
Mid-Market: 100 - 1,000 Employees
$60,000 - $300,000/yrRecommended Vendors
Microsoft Sentinel (committed tier)
Best value for Microsoft environments. Commitment tier at 100GB/day saves 34% vs PAYG.
Elastic Cloud (Gold tier)
Strong analytics with ML anomaly detection. Competitive resource-based pricing.
Sumo Logic (Enterprise tier)
Predictable tier-based pricing. Good for organisations wanting budget certainty.
The mid-market is the most competitive pricing segment for SIEM vendors. At 50 GB/day, the spread between cheapest (Sentinel at ~$57K/yr) and most expensive (Splunk at ~$180K/yr) is significant. Cloud-native options are strongly preferred at this scale: the infrastructure management overhead of on-premise deployment is disproportionate to the data volume. Budget for 2-3 analysts ($260,000-$390,000 in salaries) as the base for meaningful security monitoring.
Enterprise: 1,000 - 10,000 Employees
$300,000 - $1,500,000/yrRecommended Vendors
Splunk Enterprise/Cloud
Unmatched analytics depth and ecosystem for complex, heterogeneous environments.
Microsoft Sentinel
Best cloud-native option. 40-60% cheaper than Splunk for Microsoft-heavy environments.
IBM QRadar
Strong compliance features. EPS pricing provides better cost predictability at high volumes.
Enterprise SIEM decisions should be driven by proof-of-concept evaluations, not pricing alone. Deploy 2-3 vendors in parallel for 30-60 days to assess detection quality, analyst experience, and integration depth. Negotiate multi-year agreements for 20-40% discounts. Budget for full 24/7 SOC coverage (5-8 analysts + manager at $780,000-$1,200,000/yr). At this scale, managed SIEM is typically more expensive than in-house because the managed provider is essentially running a dedicated SOC for you at their margins.
Large Enterprise: 10,000+ Employees
$1,000,000 - $5,000,000+/yrRecommended Vendors
Splunk (hybrid or on-prem)
Most capable at massive scale. On-premise becomes cost-effective at this volume.
Elastic self-managed
Free core + infrastructure scales linearly. Best for organisations with deep Elastic expertise.
IBM QRadar (on-prem)
EPS pricing sub-linear scaling. Hardware amortisation beats per-GB at high volumes.
At this scale, the SIEM is a critical enterprise system comparable in importance and cost to the ERP. Multi-year strategic planning, vendor relationship management, and dedicated SIEM engineering teams are standard. On-premise or hybrid deployment often provides cost advantages over pure cloud because hardware amortisation over 3-5 years is cheaper than indefinite per-GB subscriptions at high volume. Consider dedicated SIEM platform engineering staff (separate from SOC analysts) for tuning, integration, and architecture.
Growth Planning: How SIEM Costs Scale
SIEM costs do not scale linearly with organisation size. They scale in three overlapping dimensions that create cost step functions at certain growth points. Understanding these dynamics helps avoid budget surprises during rapid growth.
Data volume scaling: As you add employees, systems, and applications, your daily log volume increases. Per-GB pricing scales roughly linearly but with volume discounts at higher tiers. The critical planning point is when you cross pricing tier boundaries (e.g., Sentinel commitment tier at 100 GB/day) -- these represent opportunities for significant per-GB savings.
Staffing scaling: Analyst needs scale in steps. One analyst covers business hours. Three analysts cover extended hours. Five to six cover 24/7. Each step adds $130,000-$260,000 per year. The transition from business-hours to 24/7 monitoring is the most significant cost step most organisations face, typically occurring around 200-500 employees when compliance or risk levels demand continuous coverage.
Complexity scaling: Larger organisations have more diverse technology stacks, requiring more integrations, more custom detection rules, and more tuning effort. Integration costs grow with each new log source type ($1,500-$8,000 per custom connector). Complexity also drives vendor selection: Splunk's deep ecosystem becomes increasingly valuable as environment complexity grows, justifying its pricing premium.
The most common cost trap during growth is the "pricing model cliff": growing from 80 to 150 GB/day on a per-GB model nearly doubles licensing cost. Plan for these transitions by evaluating commitment tiers, negotiating volume discounts, and considering vendor switches at natural growth milestones. Our vendor-specific guides for Splunk, Sentinel, QRadar, and Elastic include growth scenario modelling.
SIEM Cost by Size FAQ
How much does SIEM cost for a small business?
Small businesses (under 100 employees, fewer than 10 GB/day of log data) should budget $12,000-$60,000 per year for SIEM, depending on whether they choose managed SIEM ($3,000-$5,000/month), cloud SIEM self-managed ($1,000-$3,000/month plus analyst time), or open-source ($15,000-$40,000/year in infrastructure plus engineer time). For most small businesses, managed SIEM or MDR services provide better value than self-managed SIEM because the staffing cost of one dedicated analyst ($85,000-$130,000) would exceed the SIEM licensing cost several times over.
What SIEM should a mid-market company use?
Mid-market organisations (100-1,000 employees, 10-100 GB/day) are best served by Microsoft Sentinel (especially if Microsoft-centric, $60,000-$120,000/year in licensing), Elastic Cloud ($36,000-$72,000/year), or Sumo Logic ($40,000-$100,000/year). These cloud-native options minimise infrastructure management overhead while providing enterprise-grade detection capabilities. Mid-market organisations should budget $60,000-$300,000 per year total (including 2-3 analysts) and strongly consider managed SIEM services ($60,000-$180,000/year) as an alternative to building an in-house SOC.
How much does enterprise SIEM cost?
Enterprise SIEM deployments (1,000-10,000 employees, 100-500 GB/day) typically cost $300,000-$1,500,000 per year in total cost of ownership. Licensing ranges from $126,000-$600,000 depending on vendor (Sentinel at the lower end, Splunk at the higher end). Staffing for a 24/7 SOC adds $650,000-$900,000. Infrastructure, storage, integration, and threat intelligence add another $100,000-$300,000. Enterprise organisations should evaluate all four major vendors (Splunk, Sentinel, QRadar, Elastic) with proof-of-concept deployments and negotiate multi-year agreements for maximum discounts.
How does SIEM cost scale as a company grows?
SIEM costs scale in three dimensions: data volume (more employees and systems generate more logs), staffing (larger environments need more analysts), and complexity (more diverse technology stacks require more integrations). Per-GB pricing scales linearly with data volume but offers volume discounts at higher tiers. Staffing scales in steps (1 analyst, then 3 for extended hours, then 5-6 for 24/7). Integration costs grow with each new technology added to the stack. The most common cost trap during growth is exceeding a pricing tier boundary -- jumping from 50 to 150 GB/day can double or triple licensing costs.
What is the cheapest way to get SIEM coverage?
The cheapest path to SIEM-equivalent security monitoring depends on your size. For under 50 employees: Microsoft Defender for Business (included in M365 Business Premium at $22/user/month) provides basic SIEM-like monitoring. For 50-200 employees: managed SIEM at $3,000-$5,000/month delivers 24/7 monitoring without staffing investment. For 200-500 employees: Microsoft Sentinel with free Microsoft data sources and one internal analyst ($130,000) may total under $200,000/year. For 500+ employees: the cheapest option varies by environment and should be modelled using our multi-vendor calculator.
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