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The Buffett Effect: Celebrity Investor Disclosures and Market Reaction
A new study quantifies the "Buffett effect" — abnormal stock returns attributable purely to an investor's public recognition rather than the information content of their disclosed position — using a Wikipedia/news-based recognition index across 2000-2025 data. The finding bears on securities disclosure policy and behavioral finance research into celebrity and attention-driven market effects.
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A study defines the "Buffett effect" as the incremental abnormal stock market return generated when a recognizable investor discloses a new position, beyond what comparable but non-recognizable fund managers produce with similar disclosures (arXiv, October 14). The researchers built a recognition index using Wikipedia pageviews and ProQuest news mentions, then compared market reactions to disclosures from 24 recognizable discretionary funds against disclosures from non-recognizable managers, using data spanning 2000 to 2025 (arXiv, October 14). This has practical relevance for securities regulation, market efficiency debates, and investor-relations strategy, since it quantifies how investor fame itself — independent of information content — can move markets, with implications for 13F disclosure rules and the behavioral finance literature on celebrity and attention effects.
Source Articles
- The Buffett Effect(source)