The FHA insured more loans that were packaged in agency mortgage-backed securities last year than any of its rivals in the primary mortgage-insurance business, but private mortgage companies came out on top in the purchase-mortgage sector. FHA loans accounted for 38.8 percent of insured mortgages securitized by Fannie Mae, Freddie Mac and Ginnie Mae last year, according to a new Inside Mortgage Trends analysis of MBS loan-level data ... [Includes one data chart]