Abstract: An unpriced order auction and related market center and process are disclosed which allow posting market centers (e.g., exchanges) to schedule an auction that includes unpriced (Market) orders only. Such unpriced order auction executes at the midpoint of the NBBO, ensuring that the cross reflects the best prices in the entire marketplace, while discouraging the manipulation of the auction price on the posting market center. The disclosed auction also executes concurrently, but separately from the regular continuous matching process.

Abstract: A tracking liquidity order and related market center and process are disclosed which allow posting market centers (e.g. exchanges) to fill routable, smaller orders that would have otherwise routed off the posting market center. Such tracking liquidity orders increase the liquidity of that posting market center and allow it to execute more orders internally, without having to route them to an away market center.

Abstract: A tracking liquidity order and related market center and process are disclosed which allow posting market centers (e.g. exchanges) to fill routable, smaller orders that would have otherwise routed off the posting market center. Such tracking liquidity orders increase the liquidity of that posting market center and allow it to execute more orders internally, without having to route them to an away market center.

Abstract: A tracking liquidity order and related market center and process are disclosed which allow posting market centers (e.g. exchanges) to fill routable, smaller orders that would have otherwise routed off the posting market center. Such tracking liquidity orders increase the liquidity of that posting market center and allow it to execute more orders internally, without having to route them to an away market center.

Abstract: An unpriced order auction and related market center and process are disclosed which allow posting market centers (e.g., exchanges) to schedule an auction that includes unpriced (Market) orders only. Such unpriced order auction executes at the midpoint of the NBBO, ensuring that the cross reflects the best prices in the entire marketplace, while discouraging the manipulation of the auction price on the posting market center. The disclosed auction also executes concurrently, but separately from the regular continuous matching process.

Abstract: A tracking liquidity order and related market center and process are disclosed which allow posting market centers (e.g. exchanges) to fill routable, smaller orders that would have otherwise routed off the posting market center. Such tracking liquidity orders increase the liquidity of that posting market center and allow it to execute more orders internally, without having to route them to an away market center.

Abstract: An enhanced system and method for handling, matching and executing a diverse group of limit-priced orders in an electronic options environment is disclosed. Most of the order types disclosed are automatically repriced and reposted as the NBBO changes to increase their execution opportunities. Market maker entitlements are integrated with the order processing, so that the market maker is guaranteed an allocation of the trade if the market maker is at the NBBO when an order priced at or better than the NBBO is received. Once posted to the order book, the displayed price of an order may be eligible for preferential execution in a market maker entitlement process, regardless of whether the displayed price is original or has been automatically repriced.

Abstract: An unpriced order auction and related market center and process are disclosed which allow posting market centers (e.g., exchanges) to schedule an auction that includes unpriced (Market) orders only. Such unpriced order auction executes at the midpoint of the NBBO, ensuring that the cross reflects the best prices in the entire marketplace, while discouraging the manipulation of the auction price on the posting market center. The disclosed auction also executes concurrently, but separately from the regular continuous matching process.

Abstract: A tracking liquidity order and related market center and process are disclosed which allow posting market centers (e.g. exchanges) to fill routable, smaller orders that would have otherwise routed off the posting market center. Such tracking liquidity orders increase the liquidity of that posting market center and allow it to execute more orders internally, without having to route them to an away market center.

Abstract: An enhanced system and method for handling, matching and executing a diverse group of limit-priced orders in an electronic options environment is disclosed. Most of the order types disclosed are automatically repriced and reposted as the NBBO changes to increase their execution opportunities. Market maker entitlements are integrated with the order processing, so that the market maker is guaranteed an allocation of the trade if the market maker is at the NBBO when an order priced at or better than the NBBO is received. Once posted to the order book, the displayed price of an order may be eligible for preferential execution in a market maker entitlement process, regardless of whether the displayed price is original or has been automatically repriced.

Abstract: A tracking liquidity order and related market center and process are disclosed which allow posting market centers (e.g. exchanges) to fill routable, smaller orders that would have otherwise routed off the posting market center. Such tracking liquidity orders increase the liquidity of that posting market center and allow it to execute more orders internally, without having to route them to an away market center.

Abstract: An unpriced order auction and related market center and process are disclosed which allow posting market centers (e.g., exchanges) to schedule an auction that includes unpriced (Market) orders only. Such unpriced order auction executes at the midpoint of the NBBO, ensuring that the cross reflects the best prices in the entire marketplace, while discouraging the manipulation of the auction price on the posting market center. The disclosed auction also executes concurrently, but separately from the regular continuous matching process.

Abstract: A tracking liquidity order and related market center and process are disclosed which allow posting market centers (e.g. exchanges) to fill routable, smaller orders that would have otherwise routed off the posting market center. Such tracking liquidity orders increase the liquidity of that posting market center and allow it to execute more orders internally, without having to route them to an away market center.

Abstract: An unpriced order auction and related market center and process are disclosed which allow posting market centers (e.g., exchanges) to schedule an auction that includes unpriced (Market) orders only. Such unpriced order auction executes at the midpoint of the NBBO, ensuring that the cross reflects the best prices in the entire marketplace, while discouraging the manipulation of the auction price on the posting market center. The disclosed auction also executes concurrently, but separately from the regular continuous matching process.

Abstract: A tracking liquidity order and related market center and process are disclosed which allow posting market centers (e.g. exchanges) to fill routable, smaller orders that would have otherwise routed off the posting market center. Such tracking liquidity orders increase the liquidity of that posting market center and allow it to execute more orders internally, without having to route them to an away market center.

Abstract: A tracking liquidity order and related market center and process are disclosed which allow posting market centers (e.g. exchanges) to fill routable, smaller orders that would have otherwise routed off the posting market center. Such tracking liquidity orders increase the liquidity of that posting market center and allow it to execute more orders internally, without having to route them to an away market center.

Abstract: An enhanced system and method for handling, matching and executing a diverse group of limit-priced orders in an electronic options environment is disclosed. Most of the order types disclosed are automatically repriced and reposted as the NBBO changes to increase their execution opportunities. Market maker entitlements are integrated with the order processing, so that the market maker is guaranteed an allocation of the trade if the market maker is at the NBBO when an order priced at or better than the NBBO is received. Once posted to the order book, the displayed price of an order may be eligible for preferential execution in a market maker entitlement process, regardless of whether the displayed price is original or has been automatically repriced.

Abstract: An enhanced system and method for handling, matching and executing a diverse group of limit-priced orders in an electronic options environment is disclosed. Most of the order types disclosed are automatically repriced and reposted as the NBBO changes to increase their execution opportunities. Market maker entitlements are integrated with the order processing, so that the market maker is guaranteed an allocation of the trade if the market maker is at the NBBO when an order priced at or better than the NBBO is received. Once posted to the order book, the displayed price of an order may be eligible for preferential execution in a market maker entitlement process, regardless of whether the displayed price is original or has been automatically repriced.

Abstract: An unpriced order auction and related market center and process are disclosed which allow posting market centers (e.g., exchanges) to schedule an auction that includes unpriced (Market) orders only. Such unpriced order auction executes at the midpoint of the NBBO, ensuring that the cross reflects the best prices in the entire marketplace, while discouraging the manipulation of the auction price on the posting market center. The disclosed auction also executes concurrently, but separately from the regular continuous matching process.

Abstract: An enhanced system and method for handling, matching and executing a diverse group of limit-priced orders in an electronic options environment is disclosed. Most of the order types disclosed are automatically repriced and reposted as the NBBO changes to increase their execution opportunities. Market maker entitlements are integrated with the order processing, so that the market maker is guaranteed an allocation of the trade if the market maker is at the NBBO when an order priced at or better than the NBBO is received. Once posted to the order book, the displayed price of an order may be eligible for preferential execution in a market maker entitlement process, regardless of whether the displayed price is original or has been automatically repriced.