Best Antivirus for Small Business in 2026: Five Options, One Shortlist

Fix it now

At ten to a hundred machines the thing you are buying is coverage you can prove, not a detection score. Check what your Microsoft 365 subscription already entitles you to before you spend anything, then pick a cloud-managed business product whose defaults you can leave alone.

1. Check your Microsoft 365 plan first. Microsoft states that Defender for Business is included in Microsoft 365 Business Premium, and sells it standalone alongside Business Basic and Business Standard. If you are on Business Premium you already own it.
2. Buy Bitdefender GravityZone Business Security if nobody will ever open a policy editor. Bitdefender builds it from Modern Endpoint Protection, Network Attack Defense and Risk Management, and sells it online for 1 to 100 devices.
3. Buy ESET PROTECT Entry if you want the console on your own server as an option. ESET publishes Entry as console, Modern Endpoint Protection and Server Security – and nothing else, so check the exclusions below before you assume it covers phones.
4. Skip Kaspersky if you have any US exposure. New agreements with US persons have been prohibited since 20 July 2024 and resale, licensing and update delivery since 29 September 2024.
5. Skip consumer licences entirely. They give you no console, no coverage report and no way to see that a machine stopped reporting three months ago.
6. Whichever you buy, put two addresses in the notification rule. An unwatched console is paperwork.

No vendor publishes a comparative detection figure against its competitors, and neither will we. What separates these products at this size is deployment, default policy and whether an alert reaches a person.

If your Microsoft entitlement or the console-hosting question settles it, you are done. Below is what each product actually contains, and the four things that decide a rollout at this size.

Why it happens

A small firm without dedicated IT does not need the highest-scoring endpoint product. It needs one that installs on every machine without becoming a project, keeps a sensible policy without tuning, and tells a named human when something happens. That requirement cuts the market down quickly, and it changes which product is the right answer.

Start with what you may already hold. Microsoft documents Defender for Business as included in Microsoft 365 Business Premium and available standalone for Business Basic, Business Standard and Office 365 E1 customers, for organisations with a maximum of 300 users. That ceiling is a real one: Microsoft states that up to 300 seats may be provisioned in total across Business Basic, Standard and Premium, so a firm that grows past it changes plan family rather than tier. A surprising number of businesses buy a third-party endpoint product on top of an entitlement they already pay for.

One thing to unlearn: onboarding devices does not require Intune. Microsoft documents a local script, Group Policy and Intune as onboarding routes, and says outright that if you are not currently using Intune it recommends the script. That removes the usual reason people give for leaving the entitlement unused.

The one thing every vendor on this list will fail at equally is coverage drift. Machines get rebuilt without the agent, laptops sit in drawers, a contractor’s device never gets enrolled. The report you actually need is not a list of infections; it is a list of machines that have not checked in for a week. Whichever console you buy, find that report in the first hour and put a recurring reminder against it.

Full reference

What each shortlisted product actually contains

Rows below are taken from each vendor’s current product pages. Where a capability is an add-on rather than part of the tier, it says so, because that is where quotes go wrong.

The four things that decide a rollout at this size

• Deployment routes. A console that produces an installer link you can email, plus a Group Policy or script option, gets you to full coverage in an afternoon. Anything expecting a server to be built first will quietly stall, and a partly deployed product is worse than none because it still produces a confident-looking dashboard.
• Default policy quality. Assume nobody opens the policy editor again after the first week. A vendor whose defaults are already strict is worth more here than a vendor with better tuning options and a permissive start.
• Where alerts go. Decide now what happens when the only person who might act is on holiday, and put two addresses in the rule.
• The stale-agent report. This is the one that catches the machine rebuilt without the software. Find it before you need it.

The Kaspersky question, with the dates

The engine and the controls in Kaspersky’s business range are strong, and the complication is not technical. The Final Determination published in the Federal Register prohibits Kaspersky from entering into new agreements with US persons from 20 July 2024, and from 29 September 2024 prohibits resale of Kaspersky cybersecurity or anti-virus software, integration of it into other products and services, licensing, the provision of anti-virus signature and codebase updates, and operating Kaspersky Security Network in the United States. Kaspersky’s own US pages now state that downloads are unavailable for US customers.

That is a supply and update problem, not only a procurement one, and it is the part that matters if a contract obliges you to follow national security guidance. If you supply the public sector, a bank or a large enterprise with a supplier security policy, read your own contracts before ordering. The clause is usually general rather than naming a vendor, which is why it gets missed.

Where a third-party product still earns its place over the Microsoft entitlement

Three honest reasons. Coverage of machines that are not in your Microsoft tenant, which is the common case for a workshop PC or a machine a contractor brought. Stricter defaults out of the box, which is worth real money when there is no administrator. And a support line you can telephone in your own language, which Microsoft’s SMB plans do not give you in the same way.

One reason people give that does not hold up is Linux coverage. Microsoft lists Linux server support through the Defender for Business servers add-on, so that is a licensing question rather than a capability gap.

Naming, so your quote matches the product

Sophos changed its endpoint packaging: its current product pages name the packages Sophos Endpoint, Sophos EDR (which includes Endpoint) and Sophos XDR (which includes EDR), with the Sophos MDR service alongside them. Intercept X does not appear on the current pages. If a reseller quotes you Intercept X, ask which of the current packages it maps to before you compare prices.

The recommendation, by situation

• No IT person, no server, wants it to look after itself: GravityZone Business Security.
• Already on Microsoft 365 Business Premium: deploy Defender for Business first, then decide what is genuinely missing.
• You want the console on your own hardware: ESET PROTECT Entry or the on-premises GravityZone appliance, and check what each bundle excludes.
• Mixed estate with Linux file servers and Macs: GravityZone or ESET both cover all three, and Microsoft covers Linux with the servers add-on.
• Company phones matter: ESET puts Mobile Threat Defense in Advanced and above, Bitdefender sells Security for Mobile as an add-on, and Defender for Business supports iOS and Android in the base plan.
• Still running home antivirus licences across the office: fix that first. It breaches the terms and gives you no central view at all.

Questions people ask about this