I’m not endorsing Peter Voss‘ companies as “most promising”; however, they definitely appear to be in the running, see Launching AGI Inc.
>>Adaptive A.I. Inc & Smart Action Company are spawning a new R&D venture focusing on long-term AGI (Artificial General Intelligence). The new company, AGI Inc., is well funded for several years of significant, focused research and development without being distracted by short-term commercial considerations.<<
Even Quora co-founder Adam D’Angelo‘s Vicarious (company) is worth keeping an eye on.
>>Vicarious is developing machine learning software based on the computational principles of the human brain…. Powering this technology is a new computational paradigm we call the Recursive Cortical Network<<
Like Vicarious, Grok Solutions (formerly Numenta) is working with a “Cortical Learning Algorithm”.
There are many others, mostly in stealth, and the successful ones may even drop off the face of the Earth, never to be heard from again….