Shares of Twilio (TWLO) - Get Report just won't stop going higher. Shares of the cloud-communications company are up another 14% Wednesday. At around $34, the stock is $19 per share above its initial public offering. The stock has more than doubled from its IPO last week, TheStreet's Jim Cramer, co-manager of the Action Alerts PLUS portfolio, pointed out on CNBC's "Stop Trading" segment. 

This is a "fantastic company," which serves as the technological backbone for noteworthy companies like Uber and Facebook's (FB) - Get Report WhatsApp, he explained. 

Had Twilio gone public in February 2014, this "original unicorn" likely could have commanded a valuation four times that of its IPO valuation, Cramer reasoned. 

This is just a reminder of some of the great things that can happen to great companies when they come public. Despite the run, shares could have even more upside, he said. 

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At the time of publication, Cramer's Action Alerts PLUS had a long position in FB.