U.S. equity-index futures recovered overnight losses and edged into positive territory ahead of the 23 June trading session. S&P 500 contracts, which had opened lower at 18:00 New York time on Sunday, turned positive as European bourses began trading Monday morning, signaling a firmer tone for the cash market open. The rebound in equity futures came as oil contracts slipped into negative territory, suggesting a mixed start across asset classes. Traders said the shift in sentiment followed a generally stable news flow and light pre-market volumes.