Merrill Lynch & Co said today it took a $14.1 billion writedown and adjustments in the fourth quarter.
Bad subprime mortgage bets have forced the brokerage to sell pieces of the company to foreign investors to raise capital.
Analysts expected Merrill's write-down to land anywhere from $10 billion to $15 billion. For the year, Merrill's subprime mortgage-related losses totalled nearly $23 billion.
Merrill reported a fourth-quarter net loss of $9.8 billion, or $12.01 a share, the largest in the company's history. The world's largest brokerage turned a profit of $2.3 billion, or $2.41 a share, in the year-ago period.
The results eclipse the $2.3 billion loss in the third quarter when Merrill recorded an $8.4 billion write-down.
Chief Executive John Thain called the results "clearly unacceptable," but in the past month, Merrill has fortified its balance sheet with nearly $13 billion in capital infusions from US and Asian investors.