4Sigma is an italian firm making web applications and solutions for the industrial automation sector.

AbsInt provides advanced development tools for embedded systems, and tools for validation, verification and certification of safety-critical software. OCaml is used within their Astrée and CompCert products.

Ahrefs crawls the entire internet constantly to collect, process, and store data to build an all-in-one SEO toolkit.

The Computational Sciences Department at the AMNH has been using OCaml for almost a decade in their software package POY for phylogenetic inference

The ANSSI core missions are: to detect and react to cyber attacks, to prevent threats, to provide advice and support to governmental entities and operators of critical infrastructure, and to keep companies and the general public informed about information security threats

Arena helps organizations hire the right people.

Be Sport's mission is to enhance the value that sport brings to our lives with appropriate use of digital and social media innovations

Bloomberg, the global business and financial information and news leader, gives influential decision makers a critical edge by connecting them to a dynamic network of information, people and ideas

Cacaoweb is developing an application platform of a new kind. It runs on top of our peer-to-peer network, which happens to be one of the largest in the world

CEA-List brings together experts in smart digital systems. They are committed to developing high-added-value innovations that respond to the major challenges facing our economy and society.

Coherent Graphics is a developer of both server tools and desktop software for the processing of PDF documents

Cryptosense creates security analysis software with a particular focus on cryptographic systems

Dassault Systèmes, the 3DEXPERIENCE Company, provides businesses and people with virtual universes to imagine sustainable innovations.

Dernier Cri is a French company based in Lille and Paris using functional programming to develop web and mobile applications.

Digirati dba Hostnet is a web hosting company.

Docker provides an integrated technology suite that enables development and IT operations teams to build, ship, and run distributed applications anywhere

Esterel Technologies is a leading provider of critical systems and software development solutions for the aerospace, defense, rail transportation, nuclear, and industrial and automotive domains

Facebook has built a number of major development tools using OCaml

Fasoo uses OCaml to develop a static analysis tool.

ForAllSecure's mission is to test the world's software and provide actionable information to our customers.

Functori is a R&D company created by experienced engineers in programming languages (particularly OCaml), formal verification (automated reasoning, model checking, ...), and blockchain technology (core, smart contracts and applications development).

Galois has developed a domain specific declarative language for cryptographic algorithms.

Imandra is the world leader in cloud-scale automated reasoning.

Incubaid has developed Arakoon, a distributed key-value store that guarantees consistency above anything else.

Issuu is a digital publishing platform delivering exceptional reading experiences of magazines, catalogues, and newspapers

Jane Street is a quantitative trading firm that operates around the clock and around the globe

Kernelyze has developed a novel approximation of two-variable functions that achieves the smallest possible worst-case error among all rank-n approximations.

Kong makes it easy to distribute, monetize, manage and consume cloud APIs.

LexiFi is an innovative provider of software applications and infrastructure technology for the capital markets industry.

Matrix Lead provides professionals and companies with leading technologies and solutions for spreadsheets.

MEDIT develops SuMo, an advanced bioinformatic system, for the analysis of protein 3D structures and the identification of drug-design targets.

Microsoft Corporation is an American multinational technology corporation which produces computer software, consumer electronics, personal computers, and related services.

The Hammer Lab at Mount Sinai develops and uses Ketrew for managing complex bioinformatics workflows.

Mr. Number started as a Silicon Valley startup and developed the Mr. Number app for call blocking, later acquired by WhitePages.

Narrow Gate Logic is a company using the OCaml language in business and non-business applications.

Nomadic Labs houses a team focused on Research and Development. Our core competencies are in programming language theory and practice, distributed systems, and formal verification.

O(1) Labs is a global and remote company that incubated the Mina Protocol. Our team operates on the cutting edge of Web3 and zero-knowledge-proofs.

OCamlPro helps its clients use OCaml and Rust in their business applications, thanks to a team of experts in programming languages, software development and algorithms. OCamlPro created opam, and maintains the Flambda optimizing compilers.

Prudent Consulting offers IT solutions to large and mid-sized organizations by combining industry experience and technology expertise to help our customers achieve business goals with speed, agility, and great impact.

Psellos is a small group of computer scientists who became intrigued by the idea of coding iOS apps in OCaml.

Sakhalin develops marine charting apps for Apple iPads and iPhones.

Semgrep is a security company headquartered in San Francisco and distributed worldwide

Shiro Games is developing games using Haxe, a language built with a compiler written in OCaml.

Multi-asset platform to support investment decision-making and innovation.

Specialises in functional programming software development, consultation, and training.

Solvuu's software allows users to store big and small data sets, share the data with collaborators, execute computationally intensive algorithms and workflows, and visualize results.

Tarides builds and maintains open-source infrastructure tools in OCaml like MirageOS, Irmin, and OCaml developer tools.

TrustInSoft is a company that changes the rules in cybersecurity. TrustInSoft is the publisher of the TrustInSoft Analyzer tool.

Wolfram MathCore uses OCaml to implement its SystemModeler kernel.

XenServer is a world-class server virtualization system.

Zeo is a digital marketing company focused on helping companies to do better in SEO.