A storied investment firm says investors shouldn't pay too much attention to earnings news. : Earnings season steps up a notch this week with results from companies including Bank of America, Goldman Sachs, Netflix and Tesla, before third-quarter results are dumped en masse next week. Jensen Investment Management is an employee-owned investment management firm that only runs three strategies: quality growth, quality value and global quality growth. Given a “high” parent rating at Morningstar, the firm just offered its advice on three mistakes to avoid as a long-term investor.