How can a day trader figure out what event might have triggered a sudden spike in volume that occurs after hours?

Example: a quarter past midnight (NYSE time), the ES Dec 2016 future is crawling slowly... then suddenly, THIS:

Volume spike

From a volume of zero, to a volume of 1000 in 5 seconds.

I know that ES futures volume picks up after midnight, but this occured 15 minutes later, and the general question is,

Where can one find rapid-fire market news after hours?

Some Twitter account perhaps? Traders' chatrooms?


1 Answer 1


What happened was the BoJ announcement. Such large scale news are well covered in mainstream media (ft, bloomberg, etc) and also mainstream anti-media (eg zerohedge).

  • $\begingroup$ also note that according to boj.or.jp/en/announcements/calendar/index.htm (if I'm reading it correctly) the announcement was announced well in advance (the 16th at least) as most announcements of this kind are. Most announcements are also covered live by a large number of media outlets. $\endgroup$
    – MD-Tech
    Sep 21, 2016 at 8:43

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