In a shelf the shares are already registered, while in a PIPE they are unregistered. But could a financing include both of these elements within the same financing?
There’s no reason why such a dual-status financing can’t done; however, the issuer presumably wants to avoid the PIPE discount, and hence this scenario makes sense only if the shelf registration has too few shares remaining to handle the entire load.
“The efficient-market hypothesis may be the foremost piece of B.S. ever promulgated in any area of human knowledge!”