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The SEC's execution quality statistics measurements (Rule 605) arguably does a poor job at measuring the execution quality of illiquid securities. It also does not cover over the counter securities.

What would be a good method to utilize for measuring execution quality for such securities?

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  • $\begingroup$ I agree with you , but Kind of hard to measure if you don't have bid/ask and depth data @Sammy $\endgroup$
    – Rime
    Commented Oct 2, 2015 at 5:31
  • $\begingroup$ Could you give examples of securities you have in mind? $\endgroup$
    – lehalle
    Commented Oct 10, 2015 at 16:21
  • $\begingroup$ Non exchange securities. OTC market $\endgroup$
    – Sammy
    Commented Oct 12, 2015 at 23:38

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You would need intra-day bid-ask and volume data, otherwise this would be difficult to analyze. Even with large spreads, your trade can execute on either end of the spectrum just based off of how the market is trending that second as a whole for most low-volume securities.

For most truly illiquid securities, execution is more dependent on the broker's relationships and ability to move volume than it is the market, making it hard to classify execution for a single product as a whole. Not addressing OTC securities is really not leaving you with a lot of assets to investigate anyway.

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