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This is the daily number of shares of a security that change hands between a buyer and a seller. Also known as volume traded. Also see Up volume and Down volume.


The amount of trading sustained in a security or in the entire market during a given period. Especially heavy volume may indicate that important news has just been announced or is expected. See also average daily volume.


Volume is the number of shares traded in a company's stock or in an entire market over a specified period, typically a day.

Unusual market activity, either higher or lower than average, is typically the result of some external event. But unusual activity in an individual stock reflects new information about that stock or the stock's sector.

References in periodicals archive ?
In the ARDSnet trial (11), patients using tidal volumes of 4 mL/kg required significantly higher levels of PEEP.
This mode of ventilation provides small tidal volumes and high mean airway pressures that prevent both collapse and overdistention of the alveoli, a key goal in ARDS treatment (Chan, Stewart, & Mehta, 2007).
A high positive end-expiratory pressure, low tidal volume ventilatory strategy improves outcome in persistent acute respiratory distress syndrome: a randomized, controlled trial.
Since the higher tidal volume used in hyperinflation manoeuvres tends to increase mean airway pressure leading to adverse haemodynamic effects, the protocol used in this study was intended to minimise this by using assisted ventilation.
Other potential problems with ASV include that fact that ASV guarantees a minimum preset minute volume but not a constant tidal volume.
A single pair of Permaloc electrodes in the diaphragm produced sufficient tidal volume for these studies.
Similarly, the tidal volume delivered to the patient is not guaranteed when using pressure-driven modes.
The spirometer attached to the ventilator indicated the appropriate tidal volume but incomplete emptying of the chest.
It provides augmented tidal volume, which reduces the work of breathing for people with respiratory insufficiency caused by chronic obstructive pulmonary disease (COPD), including Alpha-1 Antitrypsin Deficiency.
The study was done in three parts: tidal volume and Fi[O.