1、zb.com, volume of yesterday was 440M in one market BTS:QC.
2、5-min chart:
3、Volume of the other market BTS:USDT was 48M.
Zb's accounts in BitShares (in total around 260M):
account balance
bitkkchubei002 162.3M
zbbts001 100M
zbsend001 1M
Note: zb has lending feature thus its volume might be higher than normal exchanges, but it's suspicious that so much are available for borrowing and dumping in a short period.