Upwind Security Raises $400 Million at a $3.8 Billion Valuation, More Than Doubling Its Worth as Cloud Security Becomes an AI-Era Priority

Investors are pouring money into the companies that protect cloud infrastructure, and one of the youngest contenders has just more than doubled its valuation in a single funding round.

Upwind Security, a San Francisco-based cloud security company, has raised $400 million in a Series C round led by Bessemer Venture Partners at a valuation of $3.8 billion, according to Tech Startups on Thursday, October 29. The valuation is up from $1.5 billion at the company's Series B round.

Canapi Ventures, Cyberstarts, Greylock Partners, Craft Ventures, Salesforce Ventures and TCV were among the other investors. Upwind has now raised more than $800 million since it was founded in 2022, and says its revenue quadrupled in 2026, though it did not disclose an absolute figure.

What Upwind does

Upwind provides cloud security software that analyses running applications and infrastructure in real time to identify and prioritise the most urgent threats. Its approach, often described as runtime security, focuses on what is actually happening inside cloud environments, rather than only scanning configurations and code for potential weaknesses.

Large organisations typically face thousands of security alerts and vulnerabilities across their cloud systems. Many of these pose little real risk, while a few are critical. By observing which applications are running, which vulnerabilities are actually exposed and how data moves, Upwind aims to help security teams focus on the problems that matter most and respond to attacks as they happen.

The founders

Upwind was co-founded by Amiram Shachar, among other entrepreneurs. Shachar previously co-founded Spot, a cloud cost optimisation company that was acquired by NetApp in 2020. Like many cybersecurity companies, Upwind has deep roots in Israel's technology ecosystem, which has produced a large number of successful security startups, many founded by veterans of the country's military intelligence units.

A rapid ascent

Raising $400 million at a $3.8 billion valuation within about four years of founding places Upwind among the fastest-growing companies in cybersecurity. The jump from $1.5 billion to $3.8 billion reflects both the company's revenue growth and strong investor appetite for cloud security.

Quadrupling revenue in a single year is unusual for an enterprise software company and suggests that Upwind is winning significant business from large customers. However, without disclosed revenue figures, it is difficult to assess the company's scale relative to competitors.

The cloud security market

Cloud security has become one of the most valuable segments of the cybersecurity industry. As companies move more of their applications and data to cloud platforms such as Amazon Web Services, Microsoft Azure and Google Cloud, they need tools to secure those environments. Misconfigurations, exposed data, vulnerable software and stolen credentials have all led to major breaches.

The market's value was underlined when Google agreed to acquire Wiz, an Israeli-founded cloud security company, for $32 billion, one of the largest acquisitions in the history of the technology industry. That deal signalled how strategically important cloud security has become to the major cloud providers and gave investors confidence that successful cloud security startups can achieve very large outcomes.

Why AI raises the stakes

The rise of artificial intelligence is adding to demand for cloud security. Companies building and deploying AI models are moving large amounts of sensitive data into cloud environments and running new types of workloads, creating fresh security risks. AI agents that can access systems and take actions on behalf of users introduce further challenges, as they could be manipulated by attackers.

At the same time, attackers are using AI to find vulnerabilities, craft convincing phishing messages and automate attacks. Security companies, in turn, are using AI to detect threats and respond faster. This arms race is driving investment across the cybersecurity industry.

Recent incidents, including a global cyber crisis linked to flaws in widely used software that knocked banks, airlines and railways offline in several countries, have reinforced the urgency for organisations to strengthen their defences.

Competition

Upwind competes in a crowded market. Wiz, now part of Google, is the leading cloud security platform. Palo Alto Networks, CrowdStrike, Microsoft and other established security companies offer cloud security products, and numerous startups compete in specific areas. Customers increasingly prefer platforms that combine multiple security functions, which favours larger providers.

Upwind's focus on runtime security and real-time threat detection is intended to differentiate it. As competition intensifies, its ability to keep growing will depend on product innovation, sales execution and partnerships with cloud providers.

The investors

Bessemer Venture Partners, which led the round, is one of the oldest venture capital firms in the United States and has a strong track record in cybersecurity and cloud software. Greylock Partners and TCV are prominent technology investors, while Salesforce Ventures' participation brings the backing of one of the world's largest software companies.

Cyberstarts, an Israeli venture firm focused on cybersecurity, has backed many of the sector's fastest-growing startups. Canapi Ventures focuses on fintech and financial services technology, suggesting interest in Upwind's potential among banks and financial institutions.

Implications for India

India is both a major market for cybersecurity and an important centre for cybersecurity talent. Indian enterprises, banks and government agencies are rapidly adopting cloud services, increasing demand for cloud security solutions. India's data protection law and sector-specific regulations require organisations to protect personal data, adding to demand.

Many global cybersecurity companies have large research and development teams in India, and Indian cybersecurity startups have also attracted investment. The success of cloud security companies such as Upwind and Wiz shows the potential for Indian founders and engineers to build global security businesses.

The funding environment

Upwind's round is part of a broader surge in large funding rounds for AI and infrastructure companies in 2026. On the same day, South Korea's FuriosaAI raised $620 million and robotics manufacturer Foundry Robotics raised $100 million. Investors are concentrating capital in companies they see as potential category leaders, leading to larger rounds and higher valuations for the best-performing startups.

What comes next

Upwind will use the funding to expand its product, grow its sales and customer success teams and potentially pursue acquisitions. Its progress will be watched as a test of whether a young company can build a large independent cloud security business in a market where the largest player is now owned by Google. With demand for cloud security rising alongside AI adoption, the market remains large enough for several significant players.