Commerzbank, Germany\'s second-biggest bank, said Monday it would beef up its core capital during the first half of this year by accepting various capital instruments in exchange for shares. Commerzbank said in a statement it would exchange 965 million euros ($1.3 billion) worth of hybrid capital instruments, subordinated debt securities and other capital instruments for 360.5 million new shares. The move would strengthen Commerzbank\'s core Tier 1 capital by 776 million during the first half of 2012, and by 1.2 billion euros in total through 2017, the statement said.