A Downtick is a transaction in a security that occurs at a price lower than the immediately preceding trade. In technical analysis and market microstructure, downticks are used to track bearish momentum and selling pressure. A sustained series of downticks signals strong selling activity. The concept of the uptick rule—historically used in the US to restrict short selling—was based on preventing short sales on downticks. Monitoring tick data helps algorithmic traders and market microstructure analysts understand intraday price dynamics at a granular level.
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