Some charts.
Date News Release Event Discovery Policy Changes May 17, 2013 Michigan Consumer Sentiment Released 25 milliseconds early Reuters Suspends the Practice May 28, 2013 Conference Board's Consumer Confidence Survey Released 1/4 second early Conference Board Ends Embargoes After Leaks
Dow Jones Admits to clock synchronization issueJun 3, 2013 ISM Manufacturing Index Released 15 milliseconds early Reuter's admits clock synchronization issue caused 15 millisecond early release Sep 18, 2013 FOMC Announcement Einstein and The Great Fed Robbery Fed Policy Change Dec 13, 2013 4pm Earnings News Releases News Leaks at Market Close Businesswire halted the practice