I think it's worth mentioning that Mark has had signature models but not with all of the brands you mention and in a different way to some...
Jaydee (Playing them before it became a signature model)
Alembic (Same deal, and his basses were totally different to the signature models and sound totally different too)
Status (The Kingbass was designed by him and Rob after working together for YEARS)
Pangborn (Never a signature model)
GB (Never a sig)
Fender (Very limited run)
Trace Elliot (No signature model products, unless you count the strings that were produced for a little while)
Ashdown (Signature product but basically an old Trace head with some bits stripped out)
TC (Unless you are counting signature toneprints haha, no products)
Markbass (No signature product)