Consolidation was readily apparent in the jumbo mortgage market last year as the top five lenders ended the year with a record-high 29.5 percent market share, according to a new year-end ranking of jumbo mortgage producers compiled by Inside Mortgage Finance. The ranking, which is based on recently released Home Mortgage Disclosure Act data, shows that the market share of the top 5 jumbo lenders in 2000 was way up from the 26.9 percent share