US stock futures slumped on Wednesday, as investors paused for breath and booked some profits after a string of all-time highs that helped the S&P 500 score the most records in a new year since 1964, MarketWatch reports.

Traders were also keeping an eye on US bonds, as the yield on the 10-year Treasury note moved closer to 2.60%, after a report that China is considering stopping its US bond buys.