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.
TI has a bunch of fabs in Dallas, Maine, Germany, Japan and China. Most of the Dallas fabs have been part of TI since the beginning - some since the 1970s. They're building a new 300mm fab north of Dallas, and just acquired the Intel / Micron JV fab in Lodi Utah. They got out of the advanced logic game a while ago, and closed down one of their R&D fabs in ~2007.
> What other companies also do this? Are Nvidia, and AMD on this list?
No and no. IBM (for Power products) and arguably Samsung (for their mobile chips) are effectively the only ones left on their own leading edge nodes. Everyone else uses TSMC, GloFo, or SMIC.
No, neither manufactures chips. They both have a variety of fabs they get supply from, but Nvidia gets much of their supply from Samsung (but they do also source from TSMC and others) and AMD gets much of their supply from TSMC.
What other companies also do this? Are Nvidia, and AMD on this list?