Using segment information from Compustat, we find that the investment by a segment of a diversified firm depends on the cash flow of the firm's other segments, but significantly less than it depends on its own cash flow. The investment by segments of highly diversified firms is less sensitive to their cash flow than the investment of comparable single-segment firms. The sensitivity of a segment's investment to the cash flow of other segments does not depend on whether its investment opportunities are better than those of the firm's other segments.

We document that an SEC investigation of an underwriter imposes indirect penalties on the underwriter and its past clients, particularly IPO clients. Targeted underwriters experience large declines in IPO market share and increased regulatory scrutiny and client risk after an SEC investigation is announced. Stock prices of clients decline significantly. We attribute these effects to a sudden deterioration in the value of the underwriter's reputation capital, suggesting that the general assumption in prior IPO research that underwriter reputation is stationary may be inappropriate. Our results also suggest that the SEC's power to institute investigations should be considered when designing optimal securities regulation.