Looks like original Docker did Series E in 2017: https://www.crunchbase.com/organization/docker/company_finan...

This is apparently "new/restructured Docker" which did Series A in 2019. From the footnote in the article: https://www.docker.com/press-release/docker-new-direction

It does seem weird to just start the letters over like that, as if it's a new hot startup.

Doing a series H might make investors think harder about why they need 8 rounds of funding over 12 years or so and still didn't manage to turn a profit.

I had a recruiter a few years ago pitch me about an amazing opportunity at a series F company that he wouldn't name in the initial pitch email. I didn't see that as an advantage at all. That's 6 rounds of investors who are all going to need to get paid and then some before you see a penny. It also implied to me the early growth/fun stage was over and they either limping along or so big to be unrecognizable as a legit startup.

That's quite interesting, let's see if it will pivot a bit for the "new" trend like going serverless

I always get amused by D-Wave, the 22 year-old "startup" that is now on its 19th funding round: https://www.crunchbase.com/organization/d-wave-systems/compa...