Bolster Raises $14M in Series B Funding


Bolster, a Santa Clara, CA-based company which specializes in multi-channel phishing protection, raised $14M in Series B funding.

The round was led by M12 with participation from existing investors Thomvest Ventures, Crosslink Capital, Liberty Global Ventures, Cheyenne Ventures, Cervin Ventures, and Transform Capital. The financing brings Bolster’s total funding to over $40 million.

The company intends to use the funds to invest in GTM initiatives that strategically prioritize executive monitoring, business email compromise (BEC) attack detection and takedown, and threat-hunting automation.

Bolster aims to make the internet a safer place by detecting, taking down, and monitoring phishing, fraud, and scam activity across the web, social media, app stores, and the dark web. Within milliseconds, the company’s system renders a verdict using LLMs and a large structured phishing dataset – delivering multi-channel phishing protection with near-perfect precision and at scale.

Since 2017, Bolster has used AI and machine learning to train models on over 100TB of structured data of URLs, domains, natural language text, and emails. It created CheckPhish, a phish and scam detection sites on the internet since 2018, with over 20% of the Fortune 500 registered as users.