What was the interest rate for a 30-year amortized fixed rate loan in 1993?

The owner of the loan is most often the "investor" -- the entity who put up the actual funds to make your mortgage happen.

This question used to have a simple answer, since there was a "bright line" definition -- the conforming loan limit....

Simply put, a "conforming" mortgage "conforms" to a set of standards so that the loan can be eligible to be sold to Fannie Mae or Freddie Mac.