Transmit Security, a Boston-based startup that’s on a mission to rid the world of passwords, has raised a massive $543 million in Series A funding. The funding round, said to be the largest Series A investment in cybersecurity history and one of the highest valuations for a bootstrapped company, was led by Insight Partners and General Atlantic, with additional investment from Cyberstarts, Geodesic, SYN Ventures, Vintage, and Artisanal Ventures.  Transmit Security said it has a pre-money valuation of $2.2 billion, and will use the new funds to expand its reach and investing in key global areas to grow the organization.

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