As of September 2026, Latka tracks 4 email encryption software companies with $10M–$100M in annual revenue. They have combined revenues of $182.4M and employ 1.1K people. They have raised $4.8M and serve 1.2K customers combined.
Every company below sells email encryption software to other businesses and is ranked by its most recent annual revenue. Revenue, funding, headcount and customer figures come from CEO interviews on the Latka podcast, public company filings, and Latka estimates where a company has not disclosed a number.
Email Encryption Software is designed to protect sensitive information transmitted via email by using cryptographic methods. This software ensures that the content of emails and their attachments cannot be accessed or read by unauthorized individuals. By transforming email messages into ciphertext, it secures communications across various sectors, including healthcare, finance, and legal, where privacy is paramount. The primary use cases for this software include safeguarding confidential information during transmission, ensuring compliance with regulatory standards such as GDPR and HIPAA, and maintaining the integrity and authenticity of communications. Common features often include end-to-end encryption, digital signatures, user authentication, and the ability to manage encryption keys effectively. Typically, buyers of email encryption software may come from IT departments, compliance teams, and legal firms, who prioritize securing their communications and protecting sensitive data.
Sorting: Highest -> Lowest
Showing 4 of 4 companies ranked by annual revenue.
Geneva, Geneve, Switzerland
Developer of an online platform designed to provide a free web-based encrypted email service. The company's platform uses client-side encryption to protect emails and user data, enabling clients to get end-to-end encrypted email services anytime.
Geneva, Switzerland
ProtonMail was founded in 2013 by scientists who met at CERN and were drawn together by a shared vision of a more secure and private Internet. Since then, ProtonMail has evolved into a global effort to protect civil liberties and build a more secure Internet, with team members also hailing from Caltech, Harvard, ETH Zurich and many other research institutions.
The Hague, Netherlands
StartMail is a secure email service that protects your privacy. It was built by the people behind Startpage, the world’s first private search engine.
San Francisco, California, United States
Paubox is the easiest way to send and receive HIPAA compliant email. No software to download, no portals to login to, just write and send emails as normal from any device
Latka tracks 4 email encryption software companies with $10M–$100M in annual revenue. Together they generate $182.4M in annual revenue and employ 1.1K people.
Proton AG is the largest, with $97.5M in annual revenue, founded in 2014.
The average email encryption software company in this list makes $45.6M a year, across 4 companies with reported revenue. They serve 1.2K customers combined.
Ranked by annual revenue, the leaders are Proton AG, Proton AG., StartMail and Paubox.
The 4 email encryption software companies with $10M–$100M in annual revenue tracked here have raised $4.8M in disclosed funding between them.
- Must provide end-to-end encryption capabilities for email content and attachments - Should support compliance with major data protection regulations - Must include features for digital signatures and user authentication - Should be compatible with major email clients and platforms - Not just encryption; must also offer secure key management solutions - Should allow for policy-based encryption to automate security processes - Must provide usability features for end-users to facilitate adoption
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