Artisan Partners Asset Management (NYSE:APAM) has reported prolonged underperformance in its business. Recent quarters have brought weaker results, with revenue growth stalling. Earnings per share have declined, pointing to pressure on profitability. Artisan Partners Asset Management, an active investment manager, operates in a part of the asset management industry that has been reshaped by fee compression, passive investing, and tighter competition for client flows. When a company in this...