Mortgage repurchase activity was up sharply at Freddie Mac during the third quarter, while buybacks were down at Fannie Mae, according to an Inside Mortgage Trends analysis of disclosures filed by the two government-sponsored enterprises. Loan sellers repurchased or made other indemnification related to $142.43 million of loans sold into Freddie mortgage-backed securities during the third quarter, a sharp 48.3 percent increase from ... [Includes two data charts]