The collapse of U.S. investment bank Lehman Brothers in September resulted in 447 million euros ($574 million) of write-downs alone, SocGen said in a statement.
But the French bank said it has increased provisions and reduced its risk exposure and is financially strong enough "to weather a potential deterioration in the economic environment of 2009."
CEO Frederic Oudea said the bank has strengthened its financial position and is in a position "to continue our development and to start 2009 with a lot of confidence."
The bank said net income in the three months through September fell to 183 million euros ($235 million) from 1.12 billion euros a year earlier.
Shares were trading 0.4 percent higher at 42.35 euros ($54.03) in Paris afternoon trade. The bank, hit by a trading scandal and the financial crisis, has lost over half of its market value this year.