Blackwall

Blackwall is a web security company, described in its funding announcement as Estonian, that sells protection for websites and applications through hosting and service providers rather than directly to site owners. Its site describes security infrastructure that a provider fits into its own environment and then offers to its customers under its own brand. The company announced a $100 million Series C on 20 October 2026.

What the product does

The service is named Gatekeeper on the company's site. It combines traffic analytics, bot mitigation, protection against layer 7 DDoS attacks, a web application firewall, custom rules and content caching. Blackwall says the parts are modular, so a provider can package them as service tiers, add-ons or premium bundles. According to the funding announcement, the technology also covers load balancing and server-side encryption.

The company says the product is API-first, which lets a provider automate provisioning and management, and that it integrates with the provider's existing tools. The service can be white-labelled, and the provider keeps control of pricing and the relationship with the end customer. The site presents this as a way for providers to turn security into recurring revenue, either as an upsell or as a default for all customers.

Who it serves

Blackwall's customers are hosting providers and other service providers. The site invites new providers to join through a partner programme and offers a partner login, documentation, a FAQ and support pages. It says it protects millions of customer workloads and, on its about page, millions of sites and applications worldwide. It publishes no customer names or detailed performance figures, and these claims are the company's own.

Company and funding

The about page names Nik Rozenberg as chief executive and founder and Denis Prochko as chief technology officer and founder, with a leadership team covering operations, finance and security, people, sales and legal. Its site lists AVP, Dawn Capital, MMC, Expeditions, Tera Ventures and Red Dawn Ventures as investors. The Series C values the company at $2.2 billion and was led by AVP, with Dawn Capital, MMC Ventures and Tera Ventures taking part.

Key facts

Product: Gatekeeper web security and traffic management service Features: Bot mitigation, L7 DDoS protection, web application firewall, custom rules, caching Model: White-label, API-first, sold through hosting providers Founders: Nik Rozenberg (CEO) and Denis Prochko (CTO) Country: Estonia Funding: $100 million Series C at a $2.2 billion valuation, led by AVP, announced 20 October 2026 Investors on its site: AVP, Dawn Capital, MMC, Expeditions, Tera Ventures, Red Dawn Ventures