Location: 395 Page Mill Road, Third Floor, Palo Alto, California, United States, 94306, United States
Founded in: 2010
Number of employees: 6-15
Funding history:
- Date: 11/2011, Series A: undisclosed amount (post valuation: undisclosed amount).
Investors: Highland Capital Partners, Social+Capital Partnership, Freestyle Captial
- Date: 06/2011, Seed: undisclosed amount (post valuation: undisclosed amount).
Investors: Accel Partners, AOL Ventures, Charles River Ventures, Freestyle Capital, Greylock Discovery Fund, Morado Ventures, Archimedes Capital, Embarcadero Ventures
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Followers (4)


Anti-spam for the social web
California, United States United States
Company description

Impermium provides a subscription-based anti-spam service that protects against the biggest threats in the social web today, allowing social application developers to remain focused on their core business. Built by the former leaders of the Yahoo! anti-spam and security teams, the company's RESTful Web Services-based solution enables site operators to prevent and mitigate most types of suspicious and abusive transactions, with real-time and batch monitoring of web transactions, and hosted mitigation solutions to manage suspicious users.

Impermium provides the essential anti-abuse and security services for many of the Internet's most popular consumer web sites and social media engagement platforms. The company’s investors include Accel Partners, Archimedes Capital, AOL Ventures, Charles River Ventures, Freestyle Capital, Greylock Discovery Fund, Highland Capital Partners, Morado Ventures, and the Social+Capital Partnership.


  • Mark Risher
    Mark Risher | Team member
    Mark Risher is CEO and Co-Founder of Impermium. As the former "Spam Czar" for Yahoo!, he has regularly presented to government, industry, and consumer groups about spam, abuse and cyber security.
Business model
Competitive advantage

Impermium is a stealth-mode, engineering-driven startup dedicated to helping consumer web sites protect themselves from "social spam," including account hacking, bot attacks, and more.

We're funded by some of the most experienced and influential investors in the Valley, and our limited-beta is already receiving strong enthusiasm and rapid uptake.

Dave Samuel
David Samuel is a seasoned entrepreneur, internet pioneer and enabling investor.