Not all scandals are created equal. As such, Invesco Funds is apparently digging in its heels and preparing for a dogfight with regulators, a stark contrast to the "yes siring" going on at firms accused of more outrageous activities.

So far bad-boys Putnam, Strong and Pilgrim Baxter have been charged with self-dealing, while Bank of America's NationsFunds is being investigated for illegal late trading and market-timing. Other firms have come under fire for the more "garden-variety" market-timing schemes in that they failed to disclose their short-term trading arrangements in their funds' prospectuses.

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