Cyber Insurance for Manufacturers: What to Prove in 2026

Your cyber insurance renewal hit your desk three weeks before the deadline. You pull up the application and find twelve pages of technical questions you didn't have to answer two years ago. What's your OT network segmentation status? Do you have MFA on all remote desktop access? Can you produce an asset inventory for every device on the plant floor? If you're scrambling for answers, you're not alone.

Manufacturing companies are now among the highest-risk categories in commercial cyber insurance. Ransomware groups have learned that shutting down production is more painful than stealing data, and that lesson has reshaped how insurers price and underwrite manufacturing risk. A 2025 survey by Marsh found that 67 percent of manufacturers who submitted cyber claims saw their premiums increase at renewal, and 23 percent faced coverage restrictions or non-renewals tied to failing the new technical controls questionnaire.

In South Florida, we're seeing this play out in real time. General contractors are asking manufacturers for proof of cyber coverage before signing supply agreements. Defense primes require it for any supplier with network access to drawings or specs. And manufacturers with aging PLC systems and no formal incident response plan are finding themselves quoted at rates that don't make sense, or turned down outright. Here's what the 2026 underwriting process looks like in practice, and what you need in place before that renewal packet lands.

Key Takeaways

• Underwriters now score manufacturers on OT-specific controls, not just standard IT security
• MFA on all remote access is a hard requirement at most carriers in 2026
• Network segmentation between IT and OT is scrutinized at every renewal
• An incident response plan that covers production shutdowns is now a standard ask
• Manufacturers without tested backup and recovery processes are facing 30 to 50 percent premium increases

Why Manufacturers Face the Toughest Underwriting Questions Now

The Shift in Ransomware Targeting

Ransomware groups that used to focus on hospitals and law firms figured something out: a manufacturer that can't run its plant floor loses money faster than almost any other business type. Production downtime at $10,000 or more per hour concentrates the mind of an insurer very quickly. That's why carriers now apply what they call "critical operations" scrutiny to manufacturing accounts. Your risk isn't just about data theft. It's about uptime, production continuity, and what happens when someone locks your SCADA system on a Tuesday morning when you're running a full production shift.

OT Systems Are the Coverage Gap Insurers Look For

Most manufacturers deployed their operational technology long before cybersecurity was a priority. PLCs, SCADA systems, HMI panels, these were designed to run reliably, not securely. When IT teams upgraded corporate infrastructure to modern standards, the plant floor often stayed behind on older software and legacy network configurations. Underwriters know this pattern well. Their questionnaires now specifically ask whether OT systems are isolated from the corporate network and how remote vendor access to those systems is controlled. If your answer is "we have a VPN" without further detail, expect follow-up questions and a harder underwriting conversation.

Actionable tip: If you're not sure whether your OT systems are segmented from your corporate network, have your IT team run a simple test: can a laptop on the office Wi-Fi ping a device on the plant floor? If it can, that's a direct path that underwriters will flag as an open risk.

The Six Controls Every Underwriter Reviews First

Cyber insurance underwriters aren't looking for perfection. They're looking for evidence that you've made it meaningfully harder for an attacker to cause a major loss. These six areas are where they spend the most time on manufacturing accounts.

Multi-Factor Authentication

MFA on remote desktop protocol, VPN access, and any system exposed to the internet is now a baseline requirement at virtually every major carrier. If your technicians or vendors log into plant systems remotely without MFA, you'll either be denied or quoted at a significant surcharge. This isn't a nice-to-have condition buried in the application. It's a coverage requirement that will come up before your policy is bound. Many carriers will ask for a screenshot or configuration confirmation before issuing the policy.

Network Segmentation Between IT and OT

Your office IT and your plant OT should not share the same flat network. Underwriters want to see a documented and enforced boundary between the two environments. Firewalls, VLANs, and air gaps all count, but the segmentation needs to be intentional and verified, not accidental. Our piece on IT/OT segmentation for manufacturers covers the practical steps for getting there without disrupting production schedules.

Endpoint Detection and Response

Traditional antivirus doesn't satisfy the EDR requirement at most carriers anymore. They want to see software that actively monitors system behavior, not just signature-based detection. If you're still running legacy AV on your Windows-based HMI stations or engineering workstations, your broker will likely tell you to upgrade before renewal. Modern EDR tools have gotten much lighter and more practical to deploy in manufacturing environments than they were even two years ago.

Actionable tip: Get a copy of your carrier's supplemental manufacturing questionnaire at least six months before your renewal date. Most cyber applications include a manufacturing-specific addendum. Reading it early gives you time to close gaps without rushing.

Email Security Controls

Business email compromise is the leading cause of cyber insurance claims in manufacturing by claim frequency, outpacing ransomware. Underwriters check whether your domain has SPF, DKIM, and DMARC records properly configured. They also ask whether your team has completed security awareness training within the last twelve months. Both are quick wins if you haven't done them, and both show up on virtually every application.

Tested Backup and Recovery

The question isn't whether you have backups. It's whether your backups are immutable, tested, and stored somewhere attackers can't reach. Ransomware operators routinely target backup systems first. Underwriters want to see that you test your recovery process at least annually, that backups are stored offline or in an air-gapped environment, and that you know your recovery time objective for the plant floor specifically, not just for email or file servers.

A Written Incident Response Plan

An incident response plan that only covers email and file servers doesn't meet the 2026 bar. Underwriters want to see that your IR plan addresses production shutdowns specifically. Who calls whom when the SCADA locks up at 2 AM? What's the manual fallback for your production line? How do you communicate with customers and suppliers during a multi-day outage? These questions show up on the application, and written plans score far better than verbal assurances.

Actionable tip: Run a tabletop exercise before your renewal. Gather your operations team and IT team in the same room and walk through what happens if ransomware hits the plant floor on a Monday morning. Document the conversation. That documentation is proof to your underwriter that you've thought through the scenario and have a plan.

If you're not sure where your manufacturing operation stands on the underwriting readiness scale, our team offers a free IT and security assessment that maps your current controls against what underwriters ask about most often for manufacturers.

Two Controls Manufacturers Consistently Miss

Asset Inventory for All Connected Devices

This one catches manufacturers off guard more than almost anything else on the application. Underwriters increasingly ask detailed questions about what's connected to your network. The challenge is that manufacturers often have legacy PLCs, wireless access points, vendor-managed HMI panels, and IoT sensors that nobody has formally catalogued. If you can't tell your underwriter what's connected to your network, they can't accurately price your risk, and that uncertainty costs you at renewal.

I sat with a plant manager from a precision parts shop in Doral last fall and asked him to estimate how many devices were on his plant floor network. He said around forty. After we ran a network discovery scan, the count came back at over two hundred, including several unmanaged switches and a couple of vendor devices left online after a maintenance visit. The surprises you find during a discovery scan are far better found by you than by your insurer after a claim.

If you're already working toward CMMC compliance, your asset inventory work directly satisfies this underwriting requirement. Our CMMC readiness guide for manufacturers walks through the overlap between CMMC controls and what cyber insurers are looking for in 2026.

Actionable tip: An automated network discovery scan is the fastest way to build an initial asset inventory. Run one before you complete the insurance application. What you find becomes your baseline, and having a documented baseline is itself evidence of a mature security posture.

Third-Party Vendor Access Controls

Vendor remote access is one of the highest-risk areas for manufacturers, and underwriters know it because some of the largest manufacturing breaches in the past three years started with a vendor credential. Underwriters want to see that all vendor remote sessions go through a controlled, audited connection point, require MFA, and are time-limited rather than left permanently open. If your equipment vendors have always-on VPN credentials that nobody has reviewed since installation, that's a risk that will come up at renewal.

How to Get Ready Before the Application Arrives

Start the Conversation Twelve Months Out

Twelve months before renewal is not too early to start preparing. Your broker should be able to tell you what your current carrier is looking for and whether any controls gaps from last renewal were flagged in their notes. If you don't have a specialist broker with manufacturing experience, find one before the next renewal cycle. A generalist who also covers your property and auto policy may not know the manufacturing-specific underwriting requirements well enough to advocate for you when a question comes up.

Our managed IT services for manufacturers include quarterly security reviews designed to catch controls gaps before they become renewal problems. The compliance management work we do covers documentation, policy gaps, and audit-ready evidence packages that translate directly to the insurance application process.

Document Everything, Even Controls You Think Are Obvious

Underwriters give credit for controls that are documented and verified, not for controls that are assumed or described verbally. Written policies, completed training logs, network diagrams, incident response plans, and backup test results are all evidence you can present. The manufacturer who submits a complete documentation package gets better underwriting attention and better pricing than the one who says "we do all of this, we just don't have it written down."

Know Your Specific Risk Profile

The manufacturing IT and security landscape is different from office-only businesses. Your risks involve production continuity, supply chain exposure, and OT systems that your insurer's underwriting team may not fully understand. Part of your job at renewal is helping your underwriter understand your specific environment, not just answering their standard template questions. Our cybersecurity services team has worked with manufacturers ranging from precision machining to food processing and can help you build the documentation that makes your risk profile clear to any underwriter.

Frequently Asked Questions

How much can cyber insurance premiums increase at renewal for manufacturers?

Premium increases of 20 to 40 percent are common for manufacturers who haven't addressed the controls gaps underwriters flag most often. Manufacturers who can demonstrate MFA, network segmentation, tested backups, and a written incident response plan typically see more stable pricing and sometimes qualify for credits that reduce the overall premium.

Do I need separate coverage for OT systems and production equipment?

Some policies now offer specific extensions for OT environments and production downtime. Standard cyber policies may cover your data recovery costs but not your production losses during an outage. Review your policy language carefully and ask your broker whether your current coverage addresses plant floor shutdowns. If your policy doesn't mention operational technology or production systems, that's a gap worth closing before a claim.

What's the difference between business interruption and cyber business interruption?

Standard business interruption coverage typically requires physical damage to trigger. Cyber business interruption covers losses from a cyber event even without physical damage, which is the scenario you face with ransomware or a network intrusion. Confirm your cyber policy includes cyber BI coverage and check the waiting period, which is often 8 to 12 hours before coverage kicks in and losses start accumulating toward your claim.

How do I handle vendor remote access from an underwriting standpoint?

Require that all vendor remote sessions go through a controlled, audited connection point with MFA enforced and sessions time-limited. Document your vendor access policy and keep a log of sessions including start time, end time, and what the vendor accessed. This directly reduces your risk score with most carriers and gives you evidence to present at renewal that you're managing third-party access actively rather than reactively.

Is cybersecurity training required to renew cyber insurance in manufacturing?

Most carriers require annual security awareness training and will ask about it on the application. Some require phishing simulation testing in addition to classroom-style training. Training completion logs are the documentation you'll need. If you haven't run formal training in the past twelve months, completing it before you submit the application will strengthen your answers to the training-related questions.

Ready to Walk Into Your Next Renewal With Confidence?

The 2026 cyber insurance market is more demanding for manufacturers than it's ever been. The good news is that the controls underwriters require are the same controls that genuinely protect your operation. Getting this right doesn't just improve your renewal outcome. It reduces the chance you'll need to file a claim in the first place.

Our team works with manufacturers across South Florida to assess current controls, close the gaps that underwriters flag most often, and build the documentation package that gives you a clear advantage at renewal. Schedule a free manufacturing security assessment and we'll show you exactly where you stand before your next renewal cycle.