Net income came to 19.1 billion won (US$20 million) during the month, compared with 3.9 billion won in January 2007, Daewoo Shipbuilding & Marine Engineering said in a regulatory filing.
Sales rose 43.1 percent on-year to 696.6 billion won in January and operating profit more than tripled to 41 billion won, it said.
"The main reason behind the strong January performances was the brisk construction of high-priced ships ordered in 2004," a company official said.
Daewoo Shipbuilding & Marine Engineering reports earnings every month.