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Abnormal Security is founded by veterans Evan Reiser (left) and Sanjay Jeyakumar (right), both veterans of the advertising technology industry.
Evan Reiser and Sanjay Jeyakumar do not come from cybersecurity backgrounds. The pair linked up at TellApart, the advertising technology startup that was sold to Twitter for $479 million in the social media giant’s largest acquisition to date.
After quitting Twitter in 2018, Reiser and Jeyakumar bet that their marketing mindsets could translate to the world of email security. Their idea to use behavioral profiling—the method by which Facebook and Twitter can display ads tailored to you—to predict socially engineered email attacks has gained steam, surpassing the valuation of TellApart in two years thanks to a lofty fundraise this week.
Abnormal Security announced Wednesday a $50 million Series B funding round led by Menlo Ventures with participation from prior investor Greylock. The funding values the San Francisco-based company at more than $500 million, according to a source familiar with the deal, more than tripling its $140 million valuation following a Series A last November.
“A lot of people in security come from a threat intelligence background with antivirus and antispam, where you’re trying to recognize signals when they come …
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