** U.S.-listed shares of Canadian Natural Resources Ltd down ~4 pct at $33.65 premarket as Royal Dutch Shell divests its 8-pct stake
** CNQ one of the most active NYSE stocks premarket
** Underwriters Goldman Sachs, RBC, Scotiabank and TDSecurities bought 97.6 mln shares from Shell and looking tooffload them at $34.10, a 2.9 pct discount to stock's $35.11last sale on Mon, sources say
** Transaction represents about 2 mths of trading volume
** Shell says to use pre-tax proceeds of approx $3.3 blnfrom the sale to reduce debt
** Shell received the 97.6 mln shares, worth ~$3 bln (C$4.1bln) at the time, as partial consideration for its retreat fromCanada's oil sands in Mar 2017
** U.S-listed CNQ shares and Toronto-listed shares have gained ~12 pct this qtr as WTI crude prices have surgedabove $70