Empirically, a price increase accompanies the announcement of an open-market stock repurchase program, even though the announcement is not a commitment. In fact, for many announced programs no shares are ever actually repurchased. This article explores this puzzle. In the single-firm-type version of the model, the option that a firm grants itself by announcing a program does not generate announcement returns. In equilibrium, long-run gains from the informed trading that the option creates are offset by short-run costs from the market's accounting for this adverse selection. Based on this trade-off, I construct a signaling (two-type) model that can deliver announcement returns. In the separating equilibrium, good firms do not incur any cost when they announce programs. Their gains from informed trading in the long run offset the cost of announcement incurred in the short run. Mimicry is costly, because a bad firm's long-run gains from informed trading cannot compensate for the short-run cost of announcing.

Empirically, a price increase accompanies the announcement of an open-market stock repurchase program, even though the announcement is not a commitment. In fact, for many announced programs no shares are ever actually repurchased. This article explores this puzzle. In the single-firm-type version of the model, the option that a firm grants itself by announcing a program does not generate announcement returns. In equilibrium, long-run gains from the informed trading that the option creates are offset by short-run costs from the market's accounting for this adverse selection. Based on this trade-off, I construct a signaling (two-type) model that can deliver announcement returns. In the separating equilibrium, good firms do not incur any cost when they announce programs. Their gains from informed trading in the long run offset the cost of announcement incurred in the short run. Mimicry is costly, because a bad firm's long-run gains from informed trading cannot compensate for the short-run cost of announcing.

In practice, open-market stock repurchase programs outnumber self tender offers by approximately 10–1. This evidence is puzzling given that tender offers are more efficient in disbursing free cash and in signaling undervaluation – the two main motivations suggested in the literature for repurchasing shares. We provide a theoretical model to explore this puzzle. In the model, tender offers disburse free cash quickly but induce information asymmetry and hence require a price premium. Open-market programs disburse free cash slowly, and hence do not require a price premium, but because they are slow, result in partial free cash waste. The model predicts that the likelihood that a tender offer will be chosen over an open-market program increases with the agency costs of free cash and decreases with uncertainty (risk), information asymmetry, ownership concentration, and liquidity. These predictions are generally consistent with the empirical evidence.

Using new monthly data, we investigate open-market repurchase executions of US firms. We find that firms repurchase at prices that are significantly lower than average market prices. This price discount is negatively related to size and positively related to market-to-book ratio. Firms’ repurchase activity is followed by a positive and significant abnormal return. Importantly, the market response occurs when firms disclose their actual repurchase data in earnings announcements, and this positive response is followed by a 1-month drift. Consistent with these results, we find that insider trading is positively related to actual repurchases.

We investigate whether the post-IPO market performance of IPO stocks is related to the percentage of shares issued to the public, namely, the public float. We demonstrate that a non-linear relation exists between the public float and post-IPO returns. Specifically, as public float increases, long-run returns decrease for low levels of public float and increase for high levels of public float. This relation persists even after controlling for various firm characteristics. The best long-term performers are firms that sell either very little or sell most of their stock in the IPO. We suggest that the choice of public float level creates a trade-off between incentives to insiders and power granted to outsiders. This trade-off determines the non-linear relation found between the public float and long-run returns.

We study the choice of disclosure and share repurchase strategies of informed managers using a model that captures how they differentially impact short and long-term stock value. We identify a partial disclosure equilibrium in which firms in the lowest value region neither disclose nor repurchase, firms with intermediate values disclose but do not repurchase, and firms in the highest value region induce undervaluation by not disclosing and buy back shares. In particular, the well known unraveling result when the manager is always informed (and when disclosure is costless)—the typical upper-tailed disclosure region in classic voluntary disclosure models—need not obtain when informed managers can use repurchases to extract information rents. We offer a new perspective on open-market share repurchases—the most common form of share repurchases—when chosen optimally with disclosure. Our analysis indicates that the equilibrium disclosure region shrinks as the firm's stock trading liquidity increases.