[spiralx]

The LSE has an auction after the market closes IIRC. And these guys built an slow stock exchange, although their definition of "slow" is quite a bit quicker than yours:

https://www.theatlantic.com/business/archive/2016/06/iex-app...

There's also the LTSE which is an exchange focussed on long-term investment:

https://longtermstockexchange.com/