There was a time when this column was more than a never-ending run of IPO coverage. Then the unicorn liquidity cycle kicked off and it’s been a long run of public offerings ever since. This morning is no exception.

Doximity filed to go public earlier today. You likely haven’t heard of the company because it exists in the modestly obscure world of telehealth. But it’s a venture-backed startup all the same that raised more than $80 million from investors like Emergence, InterWest Partners, Morgenthaler Ventures and Threshold, according to Crunchbase data.

Notably, Doximity has not fundraised since 2014, a year in which it attracted just under $82 million at a valuation of $355 million, per PitchBook data. How has it managed to not raise for so long? By generating lots of cash and profit over the years. Health tech communications, it turns out, can be a lucrative endeavor.

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Doximity is a social network that allows doctors to speak to each other while complying with HIPAA, a federal law that promotes medical privacy. The network, originally defined as a LinkedIn for medical professionals, gives doctors a Rolodex for specialists, a newsfeed for healthcare updates, a communication tool to talk to patients and a job search tool.

In 2017, Doximity claimed that it reached 70% of all U.S. doctors, more than 800,000 licensed professionals.

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