NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH
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Shared Analyst Coverage: Unifying Momentum Spillover Effects

Usman Ali, David Hirshleifer

NBER Working Paper No. 25201
Issued in October 2018, Revised in February 2019
NBER Program(s):Asset Pricing

Identifying stock connections by shared analyst coverage, we find that a connected-stock (CS) momentum factor generates a monthly alpha of 1.68% (t = 9.67). In spanning regressions, the alphas of industry, geographic, customer, customer/supplier industry, single- to multi-segment, and technology momentum factors are insignificant/negative after controlling for CS momentum. Similar results hold in cross-sectional regressions and in developed international markets. Sell-side analysts incorporate news about linked stocks sluggishly. These effects are stronger for complex and indirect linkages. These results indicate that previously documented momentum spillover effects represent a unified phenomenon that is captured by shared analyst coverage.

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Document Object Identifier (DOI): 10.3386/w25201

Published: Usman Ali & David Hirshleifer, 2019. "Shared analyst coverage: Unifying momentum spillover effects," Journal of Financial Economics, . citation courtesy of

 
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