Observed arrival · 2026-10-30
O’Malley Research: CEO Changes, Measured
A searchable research project tracks CEO changes at US-listed companies and measures share-price reactions using SEC filings.
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- Researchers tracking CEO turnover and market reactions
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- The homepage reports 4,692 CEO changes since 28 October 2021 and says classification precision and recall are checked by hand.
Field notes
The workflow starts from SEC EDGAR’s Form 8-K Item 5.02 disclosures, then applies text rules and a language-model screen before a second model records event details. The site describes abnormal returns against a pre-event market model, with confidence intervals and hypotheses registered before testing. Its programme also labels a backdated dataset and holdout test as in progress, while a Chapter 11 monitor remains planned.
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