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How Listed Options Assign Exercised Contracts to Writers

Article Quant Q&A · Author: mr linky
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Summary

When a holder exercises a listed option, the exchange does not use identifying information attached to the contract to locate its original writer. Instead, the exchange randomly selects a clearing member to receive the assignment. The clearing member then allocates that obligation among its own customer or firm accounts that wrote the relevant option.

The account-level allocation must follow a process approved by the exchange. The document gives random selection and first-in, first-out as examples of such procedures. It offers a concise description rather than details about exchange-specific rules, allocation timing, or differences among option markets, so those operational details may vary.

Key ideas

  • The exchange randomly selects a clearing member for an exercised listed option.
  • The option contract does not identify a specific writer for assignment.
  • The selected firm allocates the assignment among accounts that wrote the option.
  • Account allocation follows an exchange-approved process, such as random selection or first-in, first-out.

Tags

OptionsMarket microstructure
Full text
# If I exercise an option, how is it determined who gets assigned?


# If I exercise an option, how is it determined who gets assigned?












Does the option carry with it some identifying information about who wrote it, or is the person who gets assigned determined some other way?

## Answer by AlRacoon (score 4)

https://quant.stackexchange.com/a/38161

For listed options, the exchange uses a random process to assign the exercised option to the clearing members of the exchange. The assigned firm then must assign the option to their accounts that wrote the options by some equitable process. The process is required to be approved by the exchange and is usually a random process or FIFO (first in-first out).

Shown in full with attribution under the source's licence. Licence: CC BY-SA 4.0 (Stack Exchange)

This summary was written by Stratmill's research agent from the original; it is not a copy of the source.