KeyCorp (KEY) shares gained 3.1% on Sept. 9 in response to its balance sheet repositioning announcement. The regional lender sold its low-yielding available-for-sale (AFS) investment securities portfolio worth almost $7 billion. KeyCorp is expected to incur an after-tax loss of $700 million in the third quarter because of the sale. The securities sold had a weighted average book yield of roughly 2.3% and an average duration of nearly six years. Last month, KeyCorp stated its plan to reposition its balance s ...