Research summary: This paper investigates how spinoffs improve the quality of analysts' research about diversified firms, theorizing that these deals may induce analysts to revisit their earlier coverage decisions. The gains resulting from these shifts are expected to be more pronounced when a firm undertakes a legacy (rather than a non‐legacy) spinoff, which removes the business that may be constraining analysts' coverage decisions in the first place. Consistent with this argument, firms that undertake legacy spinoffs experience greater improvements in the composition and quality of their analyst coverage than their non‐legacy counterparts, and in their overall forecast accuracy and stock market performance. Taken together, these findings shed light on the relationships among the scope decisions, analyst coverage, and valuations of diversified firms. Managerial summary: Existing research has established that when companies undertake spinoffs, analysts produce more accurate forecasts about the divesting firms than they did prior to those deals, and the stock market performance of those firms also improves relative to pre‐spinoff levels. This paper explores the effects of legacy spinoffs (the spinoff of a firm's original or “legacy” business) for forecast accuracy and stock market performance. Firms that undertake legacy spinoffs are found to enjoy greater improvements in forecast accuracy and stock market performance than their non‐legacy counterparts. These findings are driven by the fact that legacy spinoffs induce analysts to revisit their existing coverage decisions to a greater extent than non‐legacy spinoffs, contributing significantly to the economic benefits of these deals for shareholders. Copyright © 2015 John Wiley & Sons, Ltd.