Nanex Research

Nanex ~ 11-Sep-2013 ~ It's Getting Darker

The percentage of shares executed on Dark Pools and at Internalizers (trades reported to the consolidated tape from trade reporting facilities) is at a new high for the year. Probably a symptom that lit markets aren't working except for those who are co-located. The growth is genuine, as chart 2 shows below, the percentage by number of trades is also at a new high.

1. Percent of Regular Session Trading Volume and 20 period average by Reporting Exchange (from Consolidated).
The yellow lines show combined volume from the 2 trade reporting facilities, which are used by Dark Pools and Internalizers (retail trades). The 2 BATS and 2 Direct Edge exchanges are combined into one (they are merging and it reduces clutter).

2. Same as above, but using the number of trades instead of share volume.
The average trade size of Dark Pools is dropping. The growth in Dark Pool trading isn't from a few large trades, it's genuine growth.

Nanex Research