Under current U.S. Regulation NMS definitions, aggregate quotation size is the sum of the quotation sizes of all responsible brokers or dealers communicating bids or offers in an NMS security at the same price. Treat this as a U.S. securities-regulation definition; it should not be generalized to unrelated uses of aggregate size or quotation outside Regulation NMS.
ReviewedEvidence1 sourceSectionPhrases & Idioms
Quick answer
Under current U.S. Regulation NMS definitions, aggregate quotation size is the sum of the quotation sizes of all responsible brokers or dealers communicating bids or offers in an NMS security at the same price.
Key details
Canonical FormAggregate Quotation Size
Core MeaningUnder current U.S. Regulation NMS definitions, aggregate quotation size is the sum of the quotation sizes of all responsible brokers or dealers communicating bids or offers in an NMS security at the same price.
Further guidance
History Boundary
Treat this as a U.S. securities-regulation definition; it should not be generalized to unrelated uses of aggregate size or quotation outside Regulation NMS.
Meaning
Under current U.S. Regulation NMS definitions, aggregate quotation size is the sum of the quotation sizes of all responsible brokers or dealers communicating bids or offers in an NMS security at the same price.
Usage Boundary
Treat this as a U.S. securities-regulation definition; it should not be generalized to unrelated uses of aggregate size or quotation outside Regulation NMS.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
Under current U.S. Regulation NMS definitions, published aggregate quotation size is the aggregate quotation size calculated by a national securities exchange and displayed by a vendor when the order is presented to the responsible broker or dealer. This is a Regulation NMS term tied to the regulatory display context; do not collapse it into ordinary aggregate quotation size or general market-depth terminology.
Under current U.S. Regulation NMS definitions, published quotation size is a responsible broker-dealer quotation size communicated under the applicable rule and displayed by a vendor when the order is presented. This is a U.S. Regulation NMS definition and should be kept distinct from aggregate quotation size and broader non-regulatory uses of displayed size.
Under current U.S. Regulation NMS definitions, quotation size is the aggregate number of shares of an NMS security a national securities exchange or national securities association displays at a quoted price. Keep the definition tied to Regulation NMS and the rule-defined displayed-share context; do not generalize it to every platform’s informal use of size.
Under Regulation NMS, an automated quotation is a quotation displayed by a trading center that can be acted on through an automated facility meeting specified immediate-or-cancel response and update conditions. Treat this as a U.S. securities-regulation term. The definition is jurisdiction- and rule-specific, not a general dictionary label for every electronic market quote.
Block Size is a current Regulation NMS defined term. This guide preserves both alternative thresholds in the rule rather than reducing the definition to a single share-count test.
Categorized by Order Size is a current Regulation NMS defined term. This guide keeps the reporting classification tied to the enumerated rule buckets rather than informal size labels.
Under current U.S. Regulation NMS definitions, a manual quotation is a quotation other than an automated quotation. This is a U.S. Regulation NMS definition; it should not be generalized to every manually entered or human-reviewed market quote outside that framework.
