Six-year-old Melbourne start-up Heidi, which is the fastest growing company ever in the portfolio of the country’s biggest venture capital firm Blackbird Ventures, has closed a $US65 million ($98 million) funding round that has sent its valuation soaring.

It is the second funding round of 2025 for the firm that uses artificial intelligence to transcribe consultations between doctors and their patients. It will also kick off a secondary sale of $US5 million worth of existing shares this week, to clinicians among its customer base, giving staff and early investors a chance to make some money out of their on-paper gains.

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