19 August 2011


Justin Schack

Managing Director

Joe Gawronski

President and COO

Rosenblatt Securities Inc.
New York +1 212 607 3100
Dublin +353 1 855 9125

Inquiries to

Rosenblatt’s Monthly Dark Liquidity Tracker

"You have got to take this flight, might be daytime, might be night, but you can’t see your way if you’re blind"

Woody Guthrie, c1939-67 (“Airline to Heaven,” from the Billy Bragg & Wilco album “Mermaid Avenue, Vol. II”)

US dark-pool market share rose slightly in July. The 18 non-displayed venues we track executed 12.25% of consolidated US equity volume last month, up from 12.06% in June. Aggregate dark-pool volumes were up 0.63% month-to-month, to 876.7 million shares per day, compared with a 0.96% decline in consolidated volume (see “The Numbers” table on next page).

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