It has been a tough week for Invesco. Just one day after New York, Colorado and federal regulators sued the Denver-based firm for improper trading, airwaves in Denver tossed around the question of whether the Invesco name should be erased from the Denver BroncosÂ’ stadium title, Reuters reports.

The name "Invesco Field at Mile High," a licensing agreement that cost the company $60 million, may mirror the circumstances of the name "Enron Field," which is now "Minute Maid Park."

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