Dec 28 (Reuters) - Canada's main stock index rose on Friday, helped by gains in the energy sector, after ending the previous session with its biggest percentage rise in nearly three years.
* At 9:37 a.m. ET (1437 GMT), the Toronto Stock Exchange's S&P/TSX Composite index .GSPTSE was up 64.32 points, or 0.45 percent, at 14,229.53.
* The main index was set to post its first weekly gain after three consecutive weeks of declines.
* All of the index's 11 major sectors were higher, led by a 1.5 percent rise in the energy sector .SPTTEN and a 1.4 percent gain in the healthcare sector .GSPTTHC .
* Oil prices rose, with U.S. crude CLc1 up 0.9 percent and Brent crude LCOc1 0.3 percent higher. O/R
* The healthcare sector was lifted by a 9.1 percent rise in shares of Aphria Inc APHA.TO .
* U.S. cannabis retailer Green Growth Brands Ltd GGB.CD said on Thursday it would make a hostile all-stock bid for Aphria in a deal valuing it at C$2.8 billion ($2.06 billion). Aphria said on Friday the bid undervalued the company. The financials sector .SPTTFS gained 0.4 percent. The industrials sector .GSPTTIN rose 0.7 percent.
* The materials sector .GSPTTMT added 0.1 percent, as gold prices held near six-month highs and as copper was poised for its first weekly gain in five weeks. GOL/ MET/L
* On the TSX, 206 issues were higher, while 30 issues declined for a 6.87-to-1 ratio favoring gainers, with 11.15 million shares traded.
* Top percentage gainers on the TSX were Aphria and miner Hudbay Minerals Inc HBM.TO , which rose 3.0 percent.
* First Majestic Silver Corp FR.TO fell 2.5 percent, the most on the TSX, after announcing an equity offering
* The most heavily traded shares by volume were Aphria, Aurora Cannabis ACB.TO and Bombardier BBDb.TO .
* The TSX posted two new 52-week highs and no new lows.
* Across all Canadian issues there were three new 52-week highs and nine new lows, with total volume of 18.78 million shares.