The awkward thing about a perfectly good password is that a thief can use it perfectly. To a server, stolen credentials often look less like a break-in than an employee arriving for work. That gap - between knowing who an identity claims to be and deciding whether its behavior makes sense right now - is the patch of enterprise plumbing Silverfort turned into a company.
Founded in 2016 by Hed Kovetz, Yaron Kassner and Matan Fattal, Silverfort began with a narrow-sounding question: how do you add multi-factor authentication to systems that were never built to accept it? Think legacy applications, file shares, industrial equipment, command-line tools and service accounts. The conventional answer was an integration project for each resource, assuming an integration was even possible. Silverfort’s answer was to stop knocking on every application’s door.
The gap was hiding in plain sight
Silverfort connects to the identity infrastructure those resources already trust, including Active Directory and cloud identity providers. Its Runtime Access Protection technology watches authentication and access activity, assembles context around the identity, calculates risk and can approve, challenge or block the attempt before it completes. No agent needs to live on every endpoint. No proxy has to sit in front of every application. The enforcement point is the authentication flow itself.
One request, three beats
That architecture gives the company its sharpest competitive line. Okta, Microsoft Entra ID and Cisco Duo are familiar choices for authentication. CyberArk, BeyondTrust and Delinea lead many privileged-access projects. CrowdStrike, SentinelOne and Semperis approach identity risk from endpoint, detection or resilience angles. Silverfort’s claim is not that these tools vanish. It is that their controls stop at awkward borders, and its layer can carry modern policy across those borders.
“Silverfort is able to protect what no one else can. There were no solutions that we looked at that were as comprehensive.”Tom Parker, VP of IT & CISO, Kayak
The demo that changed the argument
The customer stories make the pitch less abstract. A global gaming company had ten critical legacy business applications and wanted MFA without rebuilding each one. After meeting Silverfort at a conference, the company ran a demo and proof of concept. That test changed the plan: it deployed Silverfort in a month, enrolling more than 1,000 employees, 1,000 service accounts and all ten applications.
Another useful example comes from finance. Silverfort says one bank integrated the platform with its custom MFA application and extended protection to 329 legacy applications without modifying them one by one. Kayak uses it for on-premises applications, command-line access and service accounts. Huntsville Hospital describes protecting sensitive healthcare operations. These are buyers with old and new systems cohabiting, exactly the kind of environment where an elegant greenfield diagram becomes fiction by lunch.
What failed first was the app-by-app model. It assumed every resource could speak a modern authentication protocol, every owner could schedule a change and every service account behaved like a person. Cloud adoption, remote work and machine-to-machine traffic made those assumptions more expensive. A proof of concept could reveal the invisible activity quickly. Womble Bond Dickinson’s cyber security manager put the reaction memorably: “our jaws dropped.”
A platform grew around the chokepoint
Universal MFA was the wedge. Once Silverfort could see authentication broadly and act inline, adjacent products followed. Identity Security Posture Management maps exposures such as shadow administrators and insecure protocols. Non-Human Identity Security discovers service accounts, watches how they are used and can “fence” them to an expected purpose. The Authentication Firewall challenges or blocks suspicious attempts. Identity Threat Detection and Response correlates behavior and protocol signals, then responds without waiting for an analyst to shepherd another alert through a queue.
Access Intelligence shows who touches what. Privileged Access Security adds discovery, least-privilege controls and just-in-time access outside a traditional vault. The useful distinction is between a record of danger and a control in the path of danger. Silverfort can feed context into SIEM, XDR and SOAR products, but its sales argument is strongest when it can stop credential misuse, privilege escalation or lateral movement before the session becomes an incident.
Start with the identity traffic, not the tool catalog. Inventory human and machine identities, map the resources they actually reach, choose one high-risk access path, run a proof of concept and compare time-to-coverage against app-by-app remediation. Keep an existing MFA provider if it works; extend its reach before buying a replacement.
The model also explains Silverfort’s funding curve. An $11.5 million Series A in 2018 became a $30 million Series B in 2020 and a $65 million Series C in 2022. In January 2024, Brighton Park Capital led a $116 million Series D, taking disclosed funding to $222 million. The company said annual recurring revenue had more than doubled year over year for four straight years through 2023, with more than 100 new customers arriving each quarter. By 2026 it reported more than 1,000 organizations, including several Fortune 50 companies.
The price of less plumbing
Silverfort does not publish dollar prices. Its website says quotes are based on organization size, arranged in four packages. Core starts with posture management and Universal MFA. Plus adds non-human and AI-agent security. Advanced brings the Authentication Firewall and ITDR. Enterprise includes access intelligence and privileged-access controls. Buyers can also assemble capabilities a la carte.
So the honest cost answer is: a prospective customer needs a quote. The economic case rests on labor and coverage rather than a public seat price - fewer one-off integrations, less modification of legacy systems, faster MFA reach and possible consolidation of overlapping controls. That case gets stronger in a large hybrid estate. A small, cloud-native company with a single identity provider, few privileged accounts and no legacy or OT footprint may find built-in controls sufficient. A team seeking full credential vaulting, directory replacement or endpoint protection will still need those systems too.
The procurement homework should therefore include more than license math. Count the applications that cannot accept the company’s preferred MFA, the service accounts nobody can confidently assign to an owner, the privileged accounts still outside a vault and the hours analysts spend joining identity alerts to endpoint evidence. Then price the rollout, policy operation and incident response on both sides. Silverfort wins when one integration removes enough separate projects and closes enough consequential gaps to outweigh a new platform. It loses when the estate is simple, the existing stack already covers those paths, or a buyer values a bundled control more than cross-vendor reach.
Agentless does not mean effortless. Someone still has to integrate identity sources, tune policy, decide which interruptions are acceptable and own the response. Inline enforcement is valuable precisely because it can affect real access. Organizations without reliable identity hygiene, executive backing or a staged rollout can turn a powerful control into a help-desk festival.
The identities learned to act
Silverfort’s recent moves follow the sprawl. It acquired Rezonate in November 2024 to deepen coverage across cloud identity providers, infrastructure and SaaS. In April 2026 it acquired Fabrix Security, whose AI-native engine and identity knowledge graph are designed to make authorization decisions at machine speed. Most combined capabilities were slated for the second half of 2026.
The company also formed a 2026 strategic alliance with SentinelOne and embedded identity controls into Microsoft Copilot Studio. The new subject is an AI agent that can fetch data, call tools and trigger workflows. Silverfort maps agents to human owners, evaluates their access at runtime and can allow or block an action. A planned step-up feature would ask the human owner to approve a sensitive request. It is MFA with an unusual customer: software that was about to do something on your behalf.
Three Unit 8200 alumni found Silverfort around agentless authentication.
Three venture rounds fund a move from Universal MFA into broader identity threat protection.
A $116 million Series D is followed by the Rezonate acquisition.
Fabrix, SentinelOne and Copilot Studio moves turn AI-agent access into the next runtime problem.
This is where Silverfort fits in the market: between the systems that establish identity and the security stack that investigates what identities do. Its ambition is to become the live control plane spanning both. The cleverness is architectural, but the company’s endurance will depend on mundane virtues - integration depth, policy safety, useful context and proof that one broad layer creates less work than the tools it overlaps.
For a buyer, the practical test is equally plain. Pick an access path your current stack cannot protect. Measure deployment time, false challenges, attack visibility and response speed. Make Silverfort demonstrate the gap and close it in the same proof of concept. If it cannot, the elegant chokepoint is merely another dashboard. If it can, the forgotten side door has finally met a guard.