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This document outlines the specifications for the Top of PHLX Options (TOPO) market data feed, including details on data types, message formats, and the overall architecture of the system.
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How to fill out Top of PHLX Options Interface Specifications

01
Gather all necessary data and information relevant to the options you are specifying.
02
Ensure that you have access to the PHLX Options Interface Specifications document.
03
Review the specifications to understand the required fields and formats.
04
Fill out the header section with your contact information and any relevant account details.
05
Complete the required fields for each option, including underlying asset, expiry date, strike price, and option type.
06
Double-check that all information is accurate and adheres to the specified formats.
07
Submit the completed document according to PHLX's submission guidelines.

Who needs Top of PHLX Options Interface Specifications?

01
Traders who need to execute options trades on the PHLX.
02
Market makers and brokers who are integrating with the PHLX systems.
03
Compliance officers ensuring adherence to trading regulations.
04
Entities seeking to understand PHLX options trading specifications for development purposes.
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People Also Ask about

PHLX Depth of Market (PHLX Depth) is designed to provide aggregate order book and last sale data from the PHLX Options Market in an easy-to-display format. Similar to NASDAQ TotalView-Aggregated feed, PHLX Depth summarizes the order interest at each price level in the PHLX system.
Market depth refers to the ability of the market to sustain a substantially larger order without making an impact on the security's market price. It also refers to the number of shares of a given company that may be purchased without creating a significant level of price appreciation of the particular stock.
Market depth refers to the ability of a market to hold large buy or sell orders without moving prices to significant amounts in the process. It is generally shown as a depth-of-market (DOM) with bid and ask prices and their accompanying volumes at different prices.
In finance, market depth is a real-time list displaying the quantity to be sold versus unit price. The list is organized by price level and is reflective of real-time market activity.
PHLX Depth feed is composed of a series of messages that describe orders/quotes added to, removed from, modified and executed on the PHLX Options Market as well as disseminate Auction and Option Symbol Directory information.

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Top of PHLX Options Interface Specifications is a document that outlines the technical standards and protocols for connecting to the Philadelphia Stock Exchange (PHLX) options market, detailing how options data should be transmitted and received.
Market participants, including brokers and trading firms who wish to connect to the PHLX options market, are required to file the Top of PHLX Options Interface Specifications.
To fill out the Top of PHLX Options Interface Specifications, participants must provide detailed information about their trading system architecture, data formats, network configurations, and any specific requirements for data handling as specified by the PHLX.
The purpose of the Top of PHLX Options Interface Specifications is to ensure consistent and efficient communication between the exchange and market participants, facilitating smooth trading operations in the options market.
Participants must report information regarding system capabilities, network setup, message formats, error handling mechanisms, and compliance with PHLX's operational protocols on the Top of PHLX Options Interface Specifications.
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