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Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Sometimes, in historical data—but that does not mean a public Form 4 is a reliable buy or sell signal. Studies have found predictive associations in some settings, especially when insider activity is aggregated across firms. Results vary by sample, firm size, trade type and return measure, and a public investor can act only after the filing becomes available—not on the earlier transaction date.
What a Form 4 tells you—and when you can act
Form 4 is a public disclosure of reportable changes in securities ownership by corporate insiders. Following the post-August 2002 reporting rule described in the regulatory materials, insiders generally must report covered transactions within two business days. Filings are made available through SEC EDGAR after submission. The transaction date and the date the filing becomes public are therefore different events.
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That timing distinction matters when judging a claimed trading signal. A backtest that assumes an investor could buy or sell on the insider’s transaction date may count returns that occurred before an outside investor could see the disclosure. A 2026 working-paper search summary by Omer Ozlen and Ozkan Batumoglu reports that measured strategy performance falls when entry is delayed until public disclosure; its methods and sample were not verified, so it is a preliminary illustration of the timing issue, not a settled estimate of how much return a follower can capture.
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What the historical studies found
| Study and sample | Finding | What the finding does—and does not—show |
|---|---|---|
| H. Nejat Seyhun, Quarterly Journal of Economics, 1992; U.S. insider activity from 1975–1989 | Aggregate net open-market purchases and sales by insiders in their own companies predicted up to 60% of the variation in one-year-ahead aggregate stock returns. | This is an in-sample aggregate time-series result, not an individual-stock hit rate or a current forecast. Seyhun attributed the predictive ability in part to changing business conditions and movement away from fundamentals. |
| NBER summary of a study covering NYSE, Amex and Nasdaq companies from 1975–1995 | The summary reports very little market movement when insiders traded or reported trades to the SEC. It also reports cross-sectional predictive ability, driven by insiders’ ability to predict returns in smaller firms. | The result concerns a historical U.S. sample and distinguishes market-wide movement from differences among stocks. It does not establish that a present-day investor can profitably follow an individual filing. |
| SEC review of Rule 10b5-1 evidence, 2022 | The SEC describes mixed findings: some studies reported negative abnormal returns after certain plan sales and positive abnormal returns after some plan purchases, while others found no significant difference between plan sales and non-plan sales. | The SEC notes limits in the available data and voluntary reporting of plan status, which make classification imperfect. The evidence does not support treating every plan-linked transaction as either informative or uninformative. |
These results answer different questions rather than directly canceling one another out. An aggregate relationship between insider activity and future market returns is not the same as a cross-sectional relationship between a particular firm’s insiders and that stock’s returns. Neither is identical to an immediate market reaction to a filing or to the performance of a strategy that enters after disclosure.
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Why a reported transaction is not a stand-alone signal
Purchases, sales and transaction type
The Seyhun result concerns aggregate net open-market purchases and sales. A Form 4 can report other kinds of ownership changes, so a count of all reported transactions is not automatically comparable to that study’s measure. A sale alone also does not reveal why the insider sold; the filing should not be treated as proof of a negative view about the company.
Insider circumstances and trading plans
An insider’s role, the size of a trade relative to the insider’s holdings or compensation, and whether it was connected with a trading plan can affect how a transaction should be interpreted. Rule 10b5-1 evidence remains mixed, and plan flags are not complete or perfectly classified in the data reviewed by the SEC. The presence of a plan flag is useful context, not a definitive explanation of motive or a guarantee about future returns.
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Return definitions and execution
“Outperformance” needs a defined benchmark and time window. Raw return, market-adjusted return and factor-adjusted abnormal return are different outcomes; a finding in one is not automatically a finding in the others. A strategy claim also needs to account for when the filing became public, when a trade could realistically be placed, and any transaction costs. Without those details, a reported association may not describe a return available to a follower.
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How to evaluate a Form 4 strategy claim
- Set the entry point at public disclosure. Use the filing’s public-availability time, not the insider’s earlier transaction date, to avoid counting returns a follower could not have captured.
- Check the study’s universe and period. Look for the years covered, exchanges or firm universe, and whether the analysis is about one stock at a time or aggregated insider activity.
- Check which transactions count. Find out whether the signal separates open-market purchases and sales from other transaction types and whether purchases and sales are combined or analyzed separately.
- Review the insider and plan context. Where reported, consider role, trade size relative to holdings or compensation, and plan status. Do not infer motive from a sale alone or assume plan classification is complete.
- Inspect the return test. Identify the benchmark, holding period and return measure, then check whether the strategy includes realistic filing-to-trade timing and transaction costs.
What an investor can reasonably conclude
The evidence supports a limited conclusion: insider activity has contained information about future returns in some historical samples, but the findings do not establish a dependable rule for predicting the future performance of a named stock from a single public Form 4. Historical predictability, especially in aggregate data, is not by itself evidence of a repeatable edge after disclosure timing, risk adjustment and costs.
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