This paper examines the innovative corporate structure of Thermo Electron Corporation which holds controlling interests in 11 units taken public in equity carve-outs. Carve-outs subject units of the company to the scrutiny of the capital markets, allow the compensation contracts of unit managers to be based on market performance, and shift capital acquisition and investment decisions from centralized control to unit managers. Thermo carve-outs substantially increase capital and R&D expenditures following carve-outs and generate significant value from their capital investments. Since the first carve-out in 1983, gains to shareholders have been substantially greater than industry and market benchmarks.

This study proposes a managerial discretion hypothesis of equity carve-outs in which managers value control over assets and are reluctant to carve out subsidiaries. Thus, managers undertake carve-outs only when the firm is capital constrained. Consistent with this hypothesis, firms that carve out subsidiaries exhibit poor operating performance and high leverage prior to carve-outs. Also consistent with this hypothesis, in carve-outs wherein funds raised are used to pay down debt, the average excess stock return of + 6.63 percent is significantly greater than the average excess stock return of −0.01 percent for carve-outs wherein funds are retained for investment purposes.

This paper examines long‐term block ownership by corporations and performance changes in firms with corporate block owners. We also examine potential reasons for corporate ownership including benefits in product market relationships, alleviation of financing constraints, and board monitoring by corporate owners. We find the largest significant increases in targets' stock prices, investment, and operating profitability when ownership is combined with alliances, joint ventures, and other product market relationships between purchasing and target firms, especially in industries with high research and development. Our findings are consistent with the conclusion that block ownership by corporations has significant benefits in product market relationships.

This study proposes a managerial discretion hypothesis of equity carve‐outs in which managers value control over assets and are reluctant to carve out subsidiaries. Thus, managers undertake carve‐outs only when the firm is capital constrained. Consistent with this hypothesis, firms that carve out subsidiaries exhibit poor operating performance and high leverage prior to carve‐outs. Also consistent with this hypothesis, in carve‐outs wherein funds raised are used to pay down debt, the average excess stock return of + 6.63 percent is significantly greater than the average excess stock return of −0.01 percent for carve‐outs wherein funds are retained for investment purposes.

This paper evaluates the conjecture that excess stock returns that have been documented around the announcement of corporate spin-offs represent, at least in part, the re-creation of value destroyed at the time of an earlier acquisition. We evaluate this question with a sample of spin-offs that originated as earlier acquisitions. At the time of the original acquisition, on average, announcement period returns to the bidder and the combined bidder and target firm are negative and significant. Additionally, announcement period returns at the time of the spin-off are negatively and significantly correlated with acquisition announcement period returns.