Timothy Miller, lead manager of the $3.5 billion INVESCO Dynamics Fund and the INVESCO Mid-Cap Growth Fund, left INVESCO Institutional (N.A.) Inc., where he reportedly was under SEC scrutiny for allegations of market timing. He was based in Denver. Both he and co-manager Michelle Espelien Fenton have been replaced by portfolio managers Paul Rasplicka and Michael Chapman. The two men are expected to reduce the funds' large-cap equity exposure.