What semiconductors are we talking about? Just big volume computer CPUs/GPUs? Then yes, intel is the only one left.
Big boys like Maxim, Marvel, Broadcom, Qualcomm, nVidia, AMD, Ti[1] don't have their own fabs.
What about memory? Samsung, Hynix, Micron all do their own stuff.
Analog ICs? National, Ti[1], NXP, Skyworks, ONsemi, ST, to name a few.
[1] Ti got rid of their fabs years ago to switch to TSMC but over the years they acquired a few companies small than them that have their own fabs. Those divisions still use them for fabbing those products.