Now better known for its PowerVR embedded GPUs, Imagination Technologies tried to enter the CPU market by purchasing MIPS Technologies and introducing microAptiv, interAptiv, and proAptiv cores in 2012.
It did not end up well, as the company had to sell its MIPS technology a few years later, and the MIPS architecture is now barely supported. But Imagination is now working on getting back into the CPU space by designing RISC-V cores.