OpenAI (https://openai.com/). OpenAI's research vision is at a similarly ambitious scale as DeepMind. They're also relatively more open in their research, and known to release papers, code, and models quickly. Currently, they are not as big though, more like how DeepMind was immediately after publishing their first Atari work in 2013. Give them time, and I expect them to become a very formidable opponent to DeepMind.