Not all of them. Chrysler was bought by the Germans, and IBM is still IBM. LTV went bankrupt, as did Johns Manville. Texas Instruments is still around, but they don't make transistors any more. I don't know about Chicago Rawhide.
Review the long list of contractors and major subs here: http://history.nasa.gov/SP-4206/app-e.htm
The former IBM federal systems is not part of IBM any longer, LTV is all over the place, but a good chunk is part of Northrop Grumman. That part of Chrysler was sold long ago, but I don't know who to, all the Chrysler aerospace stuff was parcelled out to various compainies at various times, parts may have just died on the vine. Texas Instruments may not make transistors any longer, but they do make all sorts of integrated circuits. They sold most of the high tech "government" equipment buisiness to Raytheon, which spun off parts to other companies because they already owned the only or one of the only competitiors, or in the case of Hughes aerospace, got shortly after they bought TI's "defense" group (which included what little space stuff they were doing) (I'm thinking of the parts that made IR detectors and the part that made RF amplifier (high power and low noise types) modules.)