HackerOne is a vulnerability coordination and bug bounty platform that connects businesses with penetration testers and cybersecurity researchers.

It was one of the first companies, along with Synack and Bugcrowd, to embrace and utilize crowd-sourced security and cybersecurity researchers as linchpins of its business model; it is the largest cybersecurity firm of its kind.

As of July 2018, HackerOne’s network consisted of approximately 200,000 researchers, had resolved 72,000 vulnerabilities across over 1,000 customer programs, and had paid $31 million in bounties.

official hackerone.com

src wikipedia.org