Startup PerimeterX Inc. today said that it has landed a $57 million growth funding round led by AllianceBernstein to bring its website security software to enterprises in more vertical markets and regions.

The investment follows a year in which the startup claims to have seen significant sales momentum. PerimeterX added 50 customers, including multiple major retailers, and helped secure more than $100 billion in e-commerce transactions that went through its customers’ websites.

San Mateo, California-based PerimeterX provides a trio of security products designed to block three kinds of common threats facing companies’ online properties. The first product, Bot Defender, filters site traffic that originates from automated sources such as web scrapers. The startup’s other two solutions are Code Defender and Browser Defender, which counter web-borne and browser-based malware, respectively.

Web-borne malware often takes the form of scripts that hackers try to embed into a company’s site for various malicious purposes. So-called web skimming attacks, for example, plant data collection code in the payments pages of e-commerce marketplaces to steal users’ credit card details. PerimeterX’s Code Defender embeds a software sensor in customers’ web pages that uses machine learning to catch malicious scripts.

Browser Defender, the startup’s third product, targets a narrower but still common security issue facing website operators: adware installed on visitors’ computers. Companies can use the product to block adware from displaying pop-ups for customers when they visit their sites and thereby reduce the risk of security issues while improving the user experience.

Many of PerimeterX’s customers are in the e-commerce business. Using the new $57 million funding round it announced this morning, the startup intends to grow its presence in other verticals such as financial services where it’s also seeing customer momentum. Additionally, PerimeterX is making plans to expand into more markets outside the U.S.

Lead investor AllianceBernstein was joined by Stereo Capital, JS Capital and Golden Arc Capital in the round. Returning PerimeterX backers Adams Street Partners, Canaan Partners, DTCP, Scale Venture Partners and Vertex Ventures US joined as well.

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