You can blame Supermicro for that.

A pesky problem of missing paperwork. Apparently Supermicro thinks that filing quarterly and annual reports is something optional, a "nice to have" rather than a "requirement". So they haven't bothered.

Nasdaq feels otherwise, and got tired of waiting for them to get their house in order, and so delisted Supermicro.

https://www.marketwatch.com/story/super-micros-stock-set-to-...