Market data plans revive proposals to move odd lots onto Sips
Consultation on democratizing odd lots data closes next week, but more solutions to order protection concerns may be needed.

US equity markets trading is based on what many market participants consider to be an anachronism: the use of round lots—units of 100 shares of a stock—as the standard unit of trading, with any order of fewer than 100 considered an odd lot.
For most of the equity markets’ history, odd lots constituted a relatively insignificant proportion of liquidity, but from around 2015 they began to account for a growing proportion of all exchange trades. Mostly this is because retail investors have shifted
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