17 December 2012


Justin Schack

Managing Director

Akhil Bhatia

Vice President

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

Inquiries to

Rosenblatt’s Market Structure News Digest

Nasdaq Cancels Trades Over a Firm’s Bad Data

—Wall Street Journal

Some premarket transactions in nine big-name stocks were canceled Thursday morning, in the latest example of the trading glitches that have plagued markets this year.

Our Take: Both clients and journalists asked us in the wake of this Nasdaq pre-market glitch whether instances like these are happening more frequently now than in the past, or if it just feels that way because of increased media and pundit scrutiny. So we asked our friends at NYSE Euronext if they had any relevant data. It turns out that

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