Armorstack vs Sikich: An Honest Comparison for Mid-Market Buyers
Sikich is a national top-30 CPA firm bundling audit, ERP, advisory, and IT under one parent. Armorstack is a specialist Managed Intelligence Provider built around four converged portfolios. We name exactly where each is the right call. Book a 30-Minute Call
Two Different Kinds of Firms
If you are a mid-market business evaluating providers for managed IT, ERP, audit, advisory, and cybersecurity, you may have shortlisted Armorstack and Sikich. They are different kinds of firms.
Sikich is a national top-30 CPA firm with $401M in revenue, 1,900+ employees, and 43 locations — including Brookfield, Wisconsin and Akron, Ohio. It bundles audit, advisory, accounting, ERP implementation, technology investment banking, insurance, and managed IT under one parent. Armorstack is an independent Managed Intelligence Provider with four converged portfolios — narrower scope, deeper specialization in cyber-physical convergence, AI security, FCC-carrier services, and regulated-industry clinical workflow.
This page is fair-comparison content — written by Armorstack but specifically including the cases where Sikich is the right call.
Quick Comparison Matrix
| Dimension | Armorstack | Sikich |
|---|---|---|
| Headquarters | Global — U.S. campaign focus | Naperville, IL (offices include Brookfield WI, Akron OH) |
| Founded | 2002 (rebranded Armorstack) | 1982 |
| Team size | 100+ technical experts | 1,900+ employees |
| Annual revenue | Mid-market specialist scale | $401.5M |
| Categorical positioning | Managed Intelligence Provider (MIP) | National professional services firm (top-30 CPA) |
| Service portfolios | 4 (VERITY · CORE · SENTRY · CITADEL) | Audit, advisory, accounting, ERP, managed IT, cybersecurity, M&A, insurance |
| Physical security integration | Yes (CITADEL) | No |
| AI security observability | Yes (SENTRY + Observability Gap framework) | Cybersecurity practice exists; AI-specific observability not a stated focus |
| Healthcare specialization | Yes (Epic, Cerner/Oracle Health, HIPAA) | General mid-market |
| CMMC 2.0 / defense focus | Yes (VERITY) | Yes (named specialty) |
| ERP implementation | No (focus is MIP) | Yes (Microsoft, Sage, NetSuite, others) |
| Audit and assurance (CPA) | No | Yes (top-30 CPA firm) |
| E-Rate (K-12) provider | Yes (FCC Section 214 carrier; SPIN) | No |
| FCC carrier authority | Yes | No |
| 24×7 SOC | Yes (SENTRY in-house) | Ask directly |
| vCISO services | Yes (VERITY) | Yes (within cybersecurity practice) |
| Geographic reach | National — global clients; U.S. campaign focus | National (43 locations) |
| Pricing transparency | Per-endpoint + bundled on request | Custom quote only |
| Strategic-advisory practice | Dedicated (VERITY) | Yes (advisory is core business) |
| Converged cyber-physical security | Yes | No |
Where Sikich Is the Right Choice
We will say so when Sikich is the better fit. Here is exactly when that is true.
Single Firm for Audit, Accounting, ERP, and IT
This is Sikich’s core strength. If you are running an annual financial audit, implementing or upgrading Microsoft Dynamics / Sage / NetSuite, and want one parent to coordinate it all, Sikich is purpose-built for that buyer profile. Armorstack does not do CPA audit, tax, or ERP implementation.
National Scale With Regional Presence
43 locations, 1,900+ employees, $401M in revenue — Sikich has scale that no independent specialist firm can match.
ERP-Specific Managed Services
Sikich is a recognized partner across Dynamics, Sage, and NetSuite. Armorstack does not implement or operate ERP at that depth.
M&A Advisory or Technology Investment Banking Alongside IT
Sikich offers those services in adjacent practices. Armorstack does not.
Baseline Security Needs, Physical Convergence Irrelevant
Sikich has a cybersecurity practice but it is not their lead identity. If you need a name-brand professional services firm with adequate cyber, this fits. If cyber is your primary buying criterion, see below.
Where Armorstack Is the Right Choice
Eight scenarios where the four-portfolio model and specialist depth matter to the outcome.
Converged Cyber + Physical Security
Armorstack offers true cyber-physical convergence. Sikich does not field access control, video, fire alarm, or low-voltage. This is the most important differentiator on this page.
AI Governance Is on Your Roadmap
SENTRY is purpose-built around AI security observability — prompt-injection detection, shadow-AI/asset discovery, NIST AI RMF and EU AI Act readiness. Sikich has a cybersecurity practice but does not stake AI security as its lead identity.
You’re a K-12 / Library Needing E-Rate
Armorstack holds FCC Section 214 carrier authority and is SPIN-registered. Sikich is not a carrier.
Healthcare EHR + Clinical Workflow Needs
Armorstack has a dedicated healthcare practice for Epic and Cerner/Oracle Health context. Sikich positions general mid-market.
Cybersecurity Is Your Primary Buying Criterion
A top-30 CPA firm has cyber as one of many practices. Armorstack is a specialist firm. For mid-market buyers where cyber is the dominant problem to solve, specialization typically beats a bundled professional-services arrangement.
24×7 In-House SOC
Armorstack operates SENTRY’s SOC in-house with named analysts.
Bundled Pricing Published on Request
Armorstack publishes per-endpoint pricing tiers and bundled portfolio packages on request. Sikich is custom quote only across its many service lines.
Direct Access to Senior Specialists
Some mid-market buyers find that a 1,900-person professional-services firm adds engagement layers between the buyer and the specialist doing the work. Armorstack’s flatter structure keeps that access direct.
Pricing Transparency
Both firms quote custom. Armorstack publishes per-endpoint pricing tiers and bundled portfolio packages on request. Sikich quotes custom across its service lines.
A note on national CPA-rooted firms: bundled audit-plus-advisory-plus-IT engagements often carry partner-level billing rates and multi-tier engagement structures built around audit economics, not managed-services delivery. For narrowly scoped cyber-only or IT-only work, that structure can mean paying for overhead not aligned to the work itself. Armorstack, as a specialist provider, prices to the scope of the engagement.
Decision Framework
| If your dominant question is… | The right choice is… |
|---|---|
| “I need audit, ERP, and IT from one firm.” | Sikich. |
| “I need M&A advisory or technology investment banking.” | Sikich. |
| “I need ERP implementation (Dynamics, Sage, NetSuite).” | Sikich. |
| “I need cyber + physical security from one vendor.” | Armorstack (CITADEL + SENTRY). |
| “AI governance is a board priority.” | Armorstack (VERITY + SENTRY). |
| “I’m a K-12 district pursuing E-Rate.” | Armorstack (FCC carrier). |
| “I’m in healthcare with EHR + facility security.” | Armorstack (healthcare practice). |
| “I’m CMMC and want a focused practice.” | Both have CMMC capability; consider scope and pricing. |
| “Cybersecurity is my primary buying criterion.” | Armorstack (specialization). |
| “I want direct access to senior specialists without multi-tier firm overhead.” | Armorstack. |
What Our Clients Tell Us When They Switch
Moving from Sikich to Armorstack, the trigger is usually:
- Cyber became the lead problem to solve and required specialist depth a CPA-rooted firm could not deliver.
- A converged need — physical security, E-Rate, AI governance, or FCC-carrier services — that Sikich does not field.
- Engagement-layer friction — partner-level billing structures and multi-tier account teams built for audit work, applied to what is really a managed-services contract.
When Sikich wins against us:
The decision is almost always bundled scope — the buyer wants audit + advisory + IT from one parent, and the integration value of that bundle outweighs cyber-specialization.
Both decisions are usually defensible.
How to Evaluate Either Firm
1. Show me your incident response playbook for {your compliance framework}.
Armorstack: published IR playbooks for HIPAA, CMMC, PCI-DSS, GLBA, NIST CSF 2.0, NIST AI RMF.
Sikich: ask directly within the cybersecurity practice.
2. Walk me through a real client’s monthly executive report.
Armorstack: VERITY Compass with NIST CSF maturity, vulnerability trend, incident telemetry, AI exposure index.
Sikich: ask directly.
3. What is your stance on AI tools in client environments?
Armorstack: documented governance + SENTRY observability + NIST AI RMF advisory.
Sikich: ask directly.
Frequently Asked Questions
Is Sikich a CPA firm or a managed services provider?
Both. Sikich is a top-30 US CPA firm that has expanded into managed IT, ERP, advisory, and cybersecurity. Armorstack is a specialist Managed Intelligence Provider — narrower scope, deeper specialization in cyber-physical convergence and AI security.
Which firm is bigger?
Sikich is dramatically larger by revenue ($401M) and headcount (1,900+). Armorstack: 100+ technical experts. Different scales for different buyer profiles.
Does Sikich offer physical security?
No. Armorstack’s CITADEL portfolio is the only true cyber-physical convergence offering among the firms compared.
Does Armorstack serve clients nationally?
Yes — Armorstack serves clients globally, with current campaign focus in the United States. Sikich serves nationally with 43 physical office locations.
I’m a K-12 district — can Sikich handle E-Rate?
Sikich is not an FCC-licensed carrier and not SPIN-registered. Armorstack holds Section 214 authority and is E-Rate eligible.
I’m in defense contracting — which firm handles CMMC 2.0?
Both have CMMC capability. Armorstack’s CMMC practice sits in the VERITY portfolio. Sikich’s sits within its broader cybersecurity and government compliance practice. Compare scope, pricing, and named CMMC-RPO/C3PAO credentials directly.
Does Sikich offer 24×7 in-house SOC?
Ask directly. Armorstack operates SENTRY’s SOC in-house.
Want a 30-Minute Call?
If you are sitting on a vendor evaluation and want a candid 30-minute call — no pitch deck, just answers — book at armorstack.ai/contact or call 877-890-5508.
If Sikich is the right fit because you need bundled audit + ERP + IT from one parent, we will tell you. Book a 30-Minute Call
Last reviewed: 2026-07-09. We update this page when either firm publishes a material service or capability change. Spotted something inaccurate? Email [email protected].