(Reuters) - Canada's main stock index fell on Wednesday as weakness in materials stocks overshadowed upbeat earnings from National Bank of Canada and Royal Bank of Canada.
* The materials sector, which includes precious and base metals miners and fertilizer companies, lost 1.3% as gold futures fell 0.3% to $1,799 an ounce.
* Miners Dundee Precious Metals Inc and Centerra Gold fell 3.9% and 3.8%, respectively, and were the top drag on the TSX.
* At 09:37 a.m. ET (14:37 GMT), the Toronto Stock Exchange's S&P/TSX composite index was down 77.04 points, or 0.42%, at 18,253.05.
* The financials sector gained 0.1% as Royal Bank of Canada and National Bank of Canada topped analysts' estimates for first-quarter profit.
* The energy sector dropped 0.7%, even though U.S. crude prices were up 1% a barrel, while Brent crude added 1.1%.
* On the TSX, 62 issues were higher, while 150 issues declined for a 2.42-to-1 ratio to the downside, with 24.02 million shares traded.
* The largest percentage gainers on the TSX were printing company Transcontinental Inc (TO:TCLa), which jumped 2.3%, and National Bank of Canada (TO:NA), which rose 2.3%.
* The most heavily traded shares by volume were Manulife Financial Corp (TO:MFC), Suncor Energy Inc (TO:SU), and Great-West Lifeco Inc (TO:GWO).
* The TSX posted 12 new 52-week highs and no new lows.
* Across all Canadian issues there were 44 new 52-week highs and six new lows, with total volume of 43.98 million shares.