New Delhi, Jan. 12 -- Indian markets could turn choppier early this week with foreign portfolio investors (FPIs) raising bearish index futures bets to a record high on Friday, ahead of the US Supreme Court decision this week on the validity of President Donald Trump's tariffs. Proprietary traders have raised their bearish bets too, setting the stage for added turbulence.

FPIs increased their net cumulative bearish bets on Nifty and Bank Nifty futures to 186,063 contracts on Friday, crossing the previous record shorting of 174,105 contracts on 24 February last year, as per Rohit Srivastava, founder of analytics firm IndiaCharts.

Meanwhile, proprietary traders-brokers who trade for themselves-raised cumulative net sales of index call opti...