Volume Almost Non-Existent for Stock Futures Overnight

I've never seen the volume for stock futures to be this low. On a normal trading day, stock index futures will trade volume of about 2,000,000 contracts. Overnight, only 51,000 contracts were traded on the S&P 500 futures! Clearly, many traders have taken an extended Easter Holiday weekend. This tick chart shows that the entire trading overnight didn't even complete a single screen. Wow!