The monthly volatility of IPO initial returns is substantial, fluctuates dramatically over time, and is considerably larger during "hot" IPO markets. Consistent with IPO theory, the volatility of initial returns is higher for firms that are more difficult to value because of higher information...

I examine the motivation for, and effect of, including a collar in a merger agreement. The most important cross-sectional determinants of the bid structure (cash vs. stock, and whether to include a collar) are the market-related stock return standard deviations for the bidder and target. This...