(The Wall Street Journal) -- Merrill Lynch, in a bid to slash its exposure to risky mortgage-backed securities, has engaged in deals with hedge funds that may have been designed to delay the day of reckoning on losses, people close to the situation said.

The transactions are among the issues likely to be examined by the Securities and Exchange Commission. The SEC is looking into how the Wall Street firm has been valuing, or "marking," its mortgage securities and how it has disclosed its positions to investors, a person familiar with the probe said. Regulators are scrutinising whether Merrill knew its mortgage-related problem was bigger than what it indicated to investors throughout the summer.