Rein Security

• Salt Security, Akamai or Snyk could add runtime execution context to products a buyer already owns, and Omdia records Rein competing against and sometimes replacing all three.
• No source in the reviewed record sizes an individual Rein deployment, so scale, spend and outcomes rest on what the company chooses to disclose.
• Rein moved its lead pitch from production application security to enterprise agent security within five months of launching, and another move would suggest the category bet has not landed with buyers.
• The product installs as a dependency in the customer’s build, so Rein’s language coverage bounds which applications it can reach, and the reviewed sources name only the NPM and Yarn ecosystems.
• Rein’s documentation site returns an authentication challenge, so an engineer cannot read the library’s behavior from the public record before contacting the company.

Rein sells to the security team that has to answer for what an application does after it ships. The company argues that tools reading the prompt into a model and the answer out of it miss the part that matters. SecurityWeek reports its framing that most application-security tools stop at code scanning and pre-production testing, which surfaces issues without showing how an application behaves once it is running.

Omdia describes the same gap from outside the company, in a note Rein hosts a copy of on its own site. Its January 2026 note says the degree of access and autonomy granted to agents means a badly configured or compromised agent introduces a new type of risk, and that Model Context Protocol servers compound it by reaching local files, databases and web APIs in real time.

The sizing of that pain is the company’s own. Rein’s survey, cited in its launch release, reports that more than three-quarters of the CISOs, application-security leaders and developers it surveyed named production-level visibility as their top requirement for improving application security. No independent measurement of the problem appears in the reviewed sources. [s2, s6, s8, s10]

Omdia’s January 2026 note describes the product as a library that becomes part of the application it protects, a body of code that lives in the application’s user space without kernel privileges, added at the build phase rather than during development. The note lists what it then does: discover the resources in the environment including shadow and zombie APIs, track asset use, inspect HTTP requests and identify the code executing them, and determine which libraries are reachable. Rein’s own pages describe the product as a sidecar running at the application layer.

Enforcement runs off a learned baseline rather than a signature list. Rein says the platform learns normal agent behavior and enforces guardrails on any deviation. SecurityWeek reports that a customer adds a single line of code and that the platform baselines acceptable behavior in under a day. It quotes the company describing a contained exploit as one where Rein sandboxes the resource being abused rather than killing the request or the process.

Rein’s documentation site is not open to the public. It resolves but returns an authentication challenge, so a buyer cannot read the library’s failure behavior from the public record, and the claim of under one millisecond of overhead rests on the company’s account. [s2, s6, s8, s17]

Omdia’s note describes Rein as competing with established application-security tools. Its note says that in API security and software composition analysis Rein is often competing against and even replacing existing tools such as Salt Security or Akamai and Snyk.

Rein’s own comparison pages point somewhere else. The site publishes alternatives pages against Lakera, Onyx and Prompt Security. Rein therefore markets against one set of rivals and, on Omdia’s account, wins budget from another.

The position a rival has to match is where the code runs. Omdia argues that kernel-level tools built on eBPF do not see how application code executes or what HTTP requests arrive. That is an engineering advantage rather than an accumulated one. [s6, s13]

Rein’s named references are quoted, and none is sized. A fourth testimonial names no company, attributed only to a senior vice president at a large wealth management company. The January 2026 launch release named Lemonade and HiBob, SiliconANGLE reported the same two names on launch day, and the June 2026 release named Lemonade and Dun & Bradstreet as adopters of the agent platform. Executives at Lemonade, Dun & Bradstreet and H&R Block are quoted by name and title on the company’s site, and H&R Block appears only through that quotation, with the reviewed sources not saying it runs the platform.

Omdia treated that proof as the work ahead. Its note says part of the challenge facing Rein is to make its voice heard in the application-security market, and to sign up poster customers prepared to go on the record about why they chose it.

Research doubles as a demand channel. Rein’s Agent Breakers team disclosed a five-stage exploit chain against an unnamed retailer’s AI shopping assistant, reported by SecurityInfoWatch in July 2026, which attributes the findings to the company throughout and notes the work was framed as an argument that prompt-layer gateways are insufficient. [s1, s6, s9, s10, s11, s12]

Rein was founded in 2024 by Matan Bar-Efrat and Netanel Rubin, both alumni of Israeli military intelligence. Calcalist reports that Bar-Efrat served as an officer in Unit 8200 and then as European sales manager at Cyberbit until Elbit Systems acquired it, and that Rubin served in the same unit before joining Check Point, where he led the vulnerability research team.

Rubin has a prior in-domain exit, and the two published accounts of it disagree. Calcalist reports that he founded the cybersecurity startup Holcy in 2018 and was its CTO until Elbit Systems acquired it in 2020. Omdia reports that Holcy was acquired by the security software vendor Lab42 in 2021, after which he became CTO there and stayed until mid-2024. Calcalist alone reports that he founded it. Both accounts record his role there and an acquisition, and neither corroborates the other on the acquirer or the year.

The company is small and its backers are well known in the same market. Calcalist put headcount at roughly 23 people in January 2026, and the seed round drew angel money from Ofer Ben-Noon of Talon and Argus, Amir Jerbi of Aqua Security and Yoav Alon of Orca Security alongside lead investor Glilot Capital. [s6, s7]

Rein publishes two compliance badge images in its site footer. A rendered read of those images shows an ISO 27001 seal and an AICPA SOC 2 Type 2 seal, and no trust portal, audit report or certificate appears on the probed surfaces, so a buyer evaluating the badges has nothing to open.

The compliance the company markets is the customer’s rather than its own. The site says Rein enables compliance with ISO 42001, the EU AI Act, NIST AI RMF and SOC 2, and the platform page frames agent audit trails as what SOX, HIPAA and EU AI Act auditors need. Those are capabilities Rein sells, and the reviewed sources record no attestation Rein itself holds beyond the two badge images.

Data handling is where the company puts its own trust argument. Rein says customers run it on their own servers so agent data stays inside the organization rather than passing through a vendor gateway, a design the reviewed sources describe without independently verifying. [s1, s2, s14, s15, s16]

Add analyzed competitors to compare them side by side with Rein Security.

Rein aims at security teams in large regulated companies. The customers its announcements name are Lemonade, HiBob and Dun & Bradstreet, and SiliconANGLE described the base at launch as companies in financial and other business-critical services. A fourth company, H&R Block, appears only through its global chief information security officer’s quotation, with the reviewed sources not saying it runs the platform.

Rein organizes its examples by industry. It says the platform is built for agentic systems across industries with different risk profiles, from financial fraud prevention and healthcare data privacy to software-vendor environments.

The segment Rein can serve without an agent story is wider than the pitch it leads with. Its own FAQ says the platform supports software composition analysis, static testing and API security for customers not yet adopting agentic workflows. Omdia names API security and software composition analysis as the two use cases where Rein competes against and sometimes replaces tools a buyer already runs.

The differentiator is where the code runs. Omdia’s January 2026 note, a copy of which Rein hosts on its own site, describes a library that lives in the application’s user space without kernel privileges and is added at the build phase rather than during development. The note says the library is available in many languages and can be called with no configuration or software development kit. The library discovers the resources in the environment including shadow and zombie APIs, inspects HTTP requests, identifies the code executing them, and works out which libraries are reachable. Rein describes the same product differently. The homepage and the platform page call it a sidecar, and so does the June announcement.

Omdia’s technical argument for that placement is about what other approaches miss. Its note says kernel-level tools built on eBPF do not see how application code executes or what HTTP requests arrive.

What Rein does with the resulting record is baseline and block. The company says the platform learns normal agent behavior and enforces guardrails on any deviation. SecurityWeek reports that a customer adds one line of code and that baselining takes under a day. It quotes the company describing a contained exploit as one where Rein sandboxes the resource being abused rather than killing the request or the process. The June release adds a Business Impact Analysis engine that ties an agent action to the business function it affects.

None of the performance or coverage claims is independently tested in the reviewed sources, and the documentation site returns an authentication challenge, so failure modes stay with the vendor’s description.

Selling is demo-led. Omdia records the strategy as landing in an account and then taking on other application-security requirements as the customer grows familiar with the platform. The reviewed homepage and platform page route a prospect to a personalized demo, and probes of the pricing and plans paths returned 404.

Rein’s named references are quoted, and none is sized. A fourth testimonial names no company, attributed only to a senior vice president at a large wealth management company. The January release named Lemonade and HiBob, and SiliconANGLE reported the same two names on launch day. The June release named Lemonade and Dun & Bradstreet, and executives at Lemonade, Dun & Bradstreet and H&R Block appear by name and title on the site, with H&R Block present only through that quotation. The reviewed sources size no individual customer deployment. Omdia framed exactly this as the work ahead, saying part of the challenge was signing up poster customers prepared to go on the record about why they chose Rein.

Research and comparison content carry the demand generation. Rein’s Agent Breakers team disclosed a five-stage exploit chain against an unnamed retailer’s AI shopping assistant, which SecurityInfoWatch reported in July 2026 with the findings attributed to the company throughout, and the site publishes alternatives pages aimed at buyers evaluating Lakera, Onyx and Prompt Security.

Pricing follows the API. Omdia’s January 2026 note records the charging mechanism as a per-API endpoint fee combined with usage-based charging on the number of APIs and the number of requests they handle.

That meter belongs to the application-security offering the note describes. No later source in the reviewed record restates it, so whether the same meter carries over to the agent platform announced in June is not documented, and the reviewed sources describe no separate agent-based unit either.

The amounts are not published on the probed surfaces. No pricing or plans page appears there, so a buyer starts with a demo request rather than a published number.

Deployment rides the customer’s existing build machinery. Omdia lists three routes for the library: through the CI/CD pipeline, where it can be added to a configuration package such as Dependabot so applications pick it up automatically, through a package-delivery framework, and in the base package a developer builds from. SecurityWeek reports the customer-facing version of that as adding a single line of code.

Adoption is staged rather than switched on. Omdia says the platform can run in observe mode and then move to enforcement once the customer is comfortable, and the company says baselining normal behavior takes under a day.

The operational risk of that model is the same as its advantage. Omdia describes the library as part of the application rather than a separate process, so a fault in it reaches that application, and the reviewed sources carry the vendor’s claim of under one millisecond of overhead without an independent measurement. The documentation that would let an engineering team judge the library’s failure behavior requires a login.

Rein publishes two compliance badge images in its site footer. A rendered read of those images shows an ISO 27001 seal and an AICPA SOC 2 Type 2 seal, and no trust portal, audit report or certificate appears on the probed surfaces, so a buyer evaluating the badges has nothing to open.

The compliance the company markets is the customer’s rather than its own. The site says Rein enables compliance with ISO 42001, the EU AI Act, NIST AI RMF and SOC 2, and the platform page frames agent audit trails as what SOX, HIPAA and EU AI Act auditors need. Those are capabilities Rein sells, and the reviewed sources record no attestation Rein itself holds beyond the two badge images.

Data handling is where Rein puts its own trust argument. It says customers run the platform on their own servers so agent data stays inside the organization instead of passing through a vendor gateway, a design the reviewed sources describe without independently verifying.

The integration surface is the software supply chain rather than a partner catalog. Omdia says the library is available in many languages including the NPM and Yarn ecosystems and can be delivered through a dependency-update tool such as Dependabot, which puts Rein inside the same machinery a customer already uses to ship code.

Coverage runs across application-security domains from one deployment. Rein says the platform applies production context across API security, software composition analysis, static and dynamic testing and AI security, and that a single deployment extends across AI and non-AI environments.

Rein sells without a public partner ecosystem so far. No partner program or integrations page appears on the probed surfaces, which is consistent with the strategy Omdia records of landing in an account and then taking on other application-security requirements.

Rein was founded in 2024 by Matan Bar-Efrat and Netanel Rubin, both alumni of Israeli military intelligence. Calcalist reports that Bar-Efrat served as an officer in Unit 8200 and then as European sales manager at Cyberbit until Elbit Systems acquired it, and that Rubin served in the same unit before joining Check Point, where he led the vulnerability research team. SecurityWeek reports that both have worked in cybersecurity since they were 18.

Rubin has a prior in-domain exit, and the two published accounts of it disagree. Calcalist reports that he founded the cybersecurity startup Holcy in 2018 and was its CTO until Elbit Systems acquired it in 2020. Omdia reports that Holcy was acquired by the security software vendor Lab42 in 2021, after which he became CTO there and stayed until mid-2024. Calcalist alone reports that he founded it. Both accounts record his role there and an acquisition, and neither corroborates the other on the acquirer or the year.

The company is small and its backers are well known in the same market. Calcalist put headcount at roughly 23 people in January 2026, and the seed round drew angel money from Ofer Ben-Noon of Talon and Argus, Amir Jerbi of Aqua Security and Yoav Alon of Orca Security alongside lead investor Glilot Capital. The about page says Rein is recruiting for both go-to-market and engineering roles.