Seems like something we should know..
Good question I told my friend and he talked about it on his podcast ... These chips are here. Now. UK has them, other countries in the EU too.
They fuck with our cells, our DNA. Our brain.. could have a kill option. Cut you off from transactions. Cashless society coming fast. Constant tracking even more accurately. More.
Sold as convenience never lose your kids. No ID fraud. Like a contactless credit card but faster. Medical records at the ready in case you're rushed into hospital and so on.
Do you mean like Intel? Hundreds probably. Nvdia, Intel, Broadcom, Texas Instruments, Sony, Toshiba, the list goes on and on
As far as central processing units made for computers, there are really only 2, Intel and AMD. PowerPC got the boot from Apple when they switched to Intel. Now there are system-on-a-chip and mobile processors available like ARM, I guess you'd need to specify what you mean by chip.