Their transaction of large amounts of shares then leads to price movement for the stock. Fundamentally speaking, rising earnings estimates and the consequent rating upgrade for Vocera imply an improvement in the company's underlying business. Investors should show their appreciation for this improving business trend by pushing the stock higher. Harnessing the Power of Earnings Estimate Revisions Empirical research shows a strong correlation between trends in earnings estimate revisions and near-term stock movements, so it could be truly rewarding if such revisions are tracked for making an investment decision.