Thornburg Mortgage Inc.'s problems began in August 2007, according to a filings with Securities and Exchange Commission. That was when the secondary market for adjustable-rate mortgage-backed securities and mortgage loans came near to a total collapse. Thornburg briefly halted new business in August and suspended its dividend. By March 6, 2008, unpaid margin calls added up to $610 million, significantly exceeding available liquidity, despite having satisfied $1.2 billion in calls since December.
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