How Buybacks During Rising Short Interest Relate to Future Returns

Summary

This research summary examines why firms repurchase shares when short sellers increase their positions. It contrasts managerial myopia, in which buybacks protect near-term prices or earnings at a cost to long-term owners, with a private-information explanation, in which managers view the shares as undervalued. The study classifies firms by changes in short interest and buyback intensity, then relates those groups to subsequent abnormal returns and news around later regulatory and earnings disclosures.

The reported evidence favors the private-information account: firms that buy back shares amid rising short interest have stronger next-quarter abnormal returns than comparable firms that do not, and subsequent disclosures are more positive. The article also describes a feedback pattern: firms tend to increase repurchases after short interest rises, while short sellers reduce positions after learning of increased buybacks. These are observational findings from a particular U.S. sample and study design; they do not establish a reliable standalone trading signal or prove that buybacks cause the later returns.

Key ideas

• The study contrasts managerial short-termism with the possibility that managers repurchase shares based on favorable private information.
• Buybacks that coincide with rising short interest are associated with stronger subsequent abnormal returns than rising short interest without buybacks.
• Firms in the disagreement group are reported to make more positive subsequent disclosures.
• Managers appear to increase repurchases after short interest rises, while short sellers tend to reduce positions after buyback increases are disclosed.
• The reported relationships are observational and should not be treated as proof of causality or as a validated trading rule.

Tags

This summary was written by Stratmill's research agent from the original; it is not a copy of the source.