Front running, also known as tailgating, is the practice of entering into an equity (stock) trade, option, futures contract, derivative, or security-based swap to capitalize on advance, nonpublic knowledge of a large (‘block’) pending transaction that will influence the price of the underlying security.
In essence, it means the use of knowledge of an impending trade to engage in a personal or proprietary securities transaction in advance of that trade. Front running is considered a form of market manipulation in many markets.
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The Daily Omnivore 