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Is there a way to monitor when executives or leaders in a company sell off large holdings?
SEC Form 3 and SEC Form 4 are filed when insiders make share/derivatives acquisitions, transfers, sells and buys There is a time limit AFTER the action where they can be filed, such as 12 business days, so this can be a substantial amount of time after the effect on the market, depending on your strategy. You can aggregate these forms from SEC sources or from third party websites and services. In some cases, types of insider trading are permissible at certain intervals, so if you learn about when certain shares become unlocked, you can try to predict what insider actions will be and share price movements around those times.