Disconnect between corp bond yields and equity performance

This week has seen some material price moves in the equity market positive and negative. What was interrsting is that some quality stocks that had bad news for not see much of a reaction in their credit spreads. A good example was Heineken whose stock trader  down ,6% on the day of results saw no change in its eurobonds. It's 2025 bonds basically still trade in negative yields. Similar patterns could be seen for hammerson and ING.