12 October 2012 6:46am

Commonwealth Bank in 2012 took a further write down on its investments in stockbroking subsidiaries acquired during the years of the equities boom.

Accounts for Commonwealth Securities show it took an impairment of A$17 million on subsidiaries during the year to June 3012. CBA took a much larger impairment of $120 million in 2011.

The impairments most likely relate to the business formerly known as IWL and acquired in late 2007 (and known before that as InvesorWeb).

CBA paid a notional value of $373 million for IWL at the time with around half of the purchase paid in...