Signal Sciences was a US-based web application security company that built a next-generation Web Application Firewall (WAF) and Runtime Application Self-Protection (RASP) platform. Founded in 2014 by former Etsy engineers Andrew Peterson, Nick Galbreath, and Zane Lackey, the company offered a developer-first, hybrid-deployment WAF/RASP solution that protected web applications, microservices, and APIs across cloud, on-premises, and containerized environments. At the time of its acquisition, Signal Sciences protected more than 40,000 applications and over a trillion production requests per month for customers including Under Armour, Duo Security, WeWork, and Chef. The company was acquired by Fastly on October 1, 2020 for approximately $775 million, and its technology now powers the Fastly Next-Gen WAF and the Secure@Edge platform.
Signal Sciences has been acquired
This company is no longer available on our private secondary market.
Company data and valuation marks are estimates and may be incomplete, stale, erroneous, or revised.
Founded
2014
Employees
100–250
Total Funding
$61.7M
4 rounds
Total raised $61.7M across 4 rounds
Funding data and valuation marks are estimates and may be incomplete, stale, erroneous, or revised.
Last updated 05-11-2026
Latest Round
Type
Series C
Date
February 2019
Amount
$35M
Valuation
—
Lead Investors
| Date | Round | Amount Raised | Valuation | Lead Investors |
|---|---|---|---|---|
| February 2019 | Series C | $35M | — | Lead Edge Capital |
| May 9, 2017 | Series B | $15M | — | CRV |
| 2015 | Series A | — | — | Index Ventures |
Andrew Peterson
Co-Founder & CEO
Nick Galbreath
Co-Founder & CTO
Zane Lackey
Co-Founder & Chief Security Officer
Competitor list is illustrative and may be incomplete, stale, or erroneous.
Cloudflare
Publicly traded cloud-based web performance and security platform offering WAF, DDoS protection, and a competing edge security stack.
Imperva
Web application and data security vendor offering legacy and cloud-based WAF and API security; acquired by Thoma Bravo in 2019 and subsequently by Thales.
F5 Networks
Application delivery and security vendor offering BIG-IP Advanced WAF and NGINX App Protect, competing in enterprise WAF and API security.
Akamai
CDN and edge security provider with App & API Protector and Kona Site Defender WAF offerings.
Wallarm
API and web application security platform offering next-gen WAF and API protection for cloud-native applications.
Contrast Security
Application security platform offering RASP and interactive application security testing (IAST) for cloud-native and enterprise apps.
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