The volume of jumbo mortgages being securitized held steady in the second quarter of 2006, but the flow of product shifted dramatically to Alt A MBS issues, according to a new ranking and analysis based on the Inside Mortgage Finance MBS Database. A total of $99.25 billion of loans exceeding the Fannie/Freddie purchase limit were securitized in the second quarter, virtually the same amount that came to the market in the...[Two data tables included]