Today shares of Coinbase began to trade after the company executed a direct listing. From a reference price of $250, Coinbase shares opened at $381 today, a change of around 52%. At its open Coinbase was valued at $99.6 billion on a fully diluted basis. As of the time of writing Coinbase has appreciated further to just over $400 per share, valuing the company at a touch more than $104 billion. Coinbase was worth $65.3 billion at its reference price, on a fully diluted basis. Coinbase’s debut has been hotly…