I am trying to get a sense of how centralized computational power is in the world, e.g. are there a few big companies and organizations that own majority of computational power in the world?

For the sake of this questions, let's define computational power as something like the number of basic floating-point operations (addition/multiplication/...) that can be performed (or something similar) as used in comparison of different CPUs/GPUs.

I am not looking for exact numbers, but a general sense of the distribution. Something like Amazon is estimated to own 20%, or 20% is at the hands of owners of smartphones, etc.

Other related measures like electricity consumption, CO2 emission, number of CPUs/GPUs, number of transistors, or similar data linked with the scale of computational power would be also helpful.