* The Toronto Stock Exchange's S&P/TSX .GSPTSE fell 39.78 points, or 0.24 percent, to 16,488.12.
* Leading the index were Nexgen Energy Ltd NXE.TO , up 10.5 percent, Aritzia Inc ATZ.TO , up 7.1 percent, and Martinrea International Inc MRE.TO , higher by 4.9 percent.
* Lagging shares were CannTrust Holdings Inc TRST.TO , down 17.3 percent, Canopy Growth Corp WEED.TO , down 8.0 percent, and Cronos Group Inc CRON.TO , lower by 6.2 percent.
* On the TSX 117 issues rose and 114 fell as a 1-to-1 ratio favored advancers. There were 9 new highs and 3 new lows, with total volume of 160.3 million shares.
* The most heavily traded shares by volume were Aurora Cannabis Inc ACB.TO , Canntrust Holdings Inc TRST.TO and Toronto-dominion Bank TD.TO .
* The TSX's energy group .SPTTEN fell 0.17 points, or 0.1 percent, while the financials sector .SPTTFS slipped 0.84 points, or 0.3 percent.
* West Texas Intermediate crude futures CLc1 rose 0.07 percent, or $0.04, to $60.24 a barrel. Brent crude LCOc1 rose 0.42 percent, or $0.28, to $66.8 O/R
* The TSX is up 15.1 percent for the year.