# CalypsoAI

Startup profile on Capital Atlas: https://capitalatlas.ai/startups/calypsoai

- Industry: Software
- Headquarters: New York, US
- Website: www.calypsoai.com/
- Total disclosed funding: $38M
- Latest round: Series A (Jun 27, 2023)
- Investors on record: 11

## About

CalypsoAI, Inc. is a US-based company specializing in enhancing AI security during the inference stage, providing critical tools for organizations to safeguard their AI models against potential threats. Founded in 2018 and headquartered in New York, US, CalypsoAI, Inc. focuses on improving AI security. The company was founded by Neil Serebryany, with Neil Serebryany also serving as the CEO. In September 2025,?F5, Inc. agreed to acquire CalypsoAI, Inc. from?Lightspeed Venture Partners, Paladin Capital Group, Frontline, 8VC, Lockheed Martin Ventures, Manta Ray Ventures, Day One Ventures, Expeditions Fund, Hakluyt Capital, K50 Ventures (Actions Capital) and Pallas Capital?for USD 180 million. The transaction was completed later in the month. This funding has supported the company’s goal of enhancing enterprise AI security at the inference layer. CalypsoAI offers a comprehensive suite of products and services that enhance AI security, particularly during the inference stage. Their key offerings include the CalypsoAI Security Leaderboard, which assesses AI models' resilience against real-world attacks, and the Inference Red-Team, designed for extensive adversarial testing and runtime protection of deployed models. These tools are utilized by AI development teams and cybersecurity professionals across North America, Europe, and Asia, addressing the urgent need for secure AI solutions in various industries. CalypsoAI generates revenue through a subscription-based model, allowing clients, including large enterprises and tech firms, to access its security tools and insights. Clients typically enter into annual contracts that provide continuous access to the CalypsoAI platform, including the Security Leaderboard and Inference Red-Team services. The transaction structure emphasizes B2B relationships, enabling organizations to mitigate risks associated with AI model deployment by leveraging tailored pricing plans and packages that reflect their specific needs. In April 2025, CalypsoAI raised USD 5.00 mn in venture funding, which will be utilized to enhance enterprise AI security at the inference layer. The acquisition enables F5, Inc. to add artificial intelligence model security tools to its enterprise software offerings and support safer AI adoption.

## Funding rounds

- Series A, Jun 27, 2023, $23M — Paladin Capital Group, Lockheed Martin Ventures, Expeditions Fund, Hakluyt Capital
- Series A, Jul 8, 2020, $13M — Paladin Capital Group, Frontline, 8VC, Lockheed Martin Ventures, Manta Ray Ventures, Day One Ventures, Pallas Capital
- Seed, Apr 11, 2019, $2.2M — Lightspeed Venture Partners, Frontline, 8VC, Day One Ventures, Actions Capital

## Investors

- Lightspeed Venture Partners (https://capitalatlas.ai/funds/lightspeed-venture-partners) — Seed
- Frontline (https://capitalatlas.ai/funds/frontline) — Seed, Series A
- 8VC (https://capitalatlas.ai/funds/8vc) — Seed, Series A
- Day One Ventures (https://capitalatlas.ai/funds/day-one-ventures) — Seed, Series A
- Actions Capital (https://capitalatlas.ai/funds/actions-capital) — Seed
- Paladin Capital Group (https://capitalatlas.ai/funds/paladin-capital-group) — Series A
- Lockheed Martin Ventures (https://capitalatlas.ai/funds/lockheed-martin-ventures) — Series A
- Manta Ray Ventures (https://capitalatlas.ai/funds/manta-ray-ventures) — Series A
- Pallas Capital — Series A
- Expeditions Fund (https://capitalatlas.ai/funds/expeditions-fund) — Series A
- Hakluyt Capital (https://capitalatlas.ai/funds/hakluyt-capital) — Series A