This paper examines the effects of employee stock ownership plans (ESOPs) on shareholder wealth. ESOPs established in the presence of takeover activity reduce share values, by approximately 4% on average. ESOPs also reduce share values if they are structured to transfer control away from outside shareholders, by creating a new ownership block with veto power over takeover bids. Large ESOPs established with nonvoting stock, so as to preclude any immediate control transfers, result in a significant increase in share values. The wealth effect of any given ESOP thus depends upon both its incentive and control effects on the corporation.

We operationalize a firm's competitive strategy through a new empirical measure, and develop a framework for empirical analysis of the market value of strategic behavior. Using this framework, we study announcement effects of R&D spending. The announcing firm's stock prices are positively influenced by a change in spending, and negatively by our competitive strategy measure (CSM). Competitors' stock prices are positively influenced by the interaction between the market's reaction to the announcing firm and the CSM. Our results are consistent with positive effects of ‘accommodating’ competition with strategic substitutes, and nonpositive effects of ‘tough’ competition with strategic complements.