May 4 (Reuters) - Canada's main stock index rose on Friday, boosted by the heavy-weight financial sector and energy companies, which were supported by higher oil prices.
* At 9:45 a.m. ET (1345 GMT), the Toronto Stock Exchange's S&P/TSX Composite Index rose 23.28 points, or 0.15 percent, to 15,644.75.
* Shares of Manulife Financial Corp and Bank of Nova Scotia, both of which were up about 0.7 percent, helped the finiancial group gain 0.13 percent.
* Oil prices strengthened as global supplies remained tight and the market awaited news from Washington on possible new U.S. sanctions against Iran.
* Also helping the energy sector was Pembina Pipeline , up 3 percent, after the company on Thursday reported higher quarterly revenue, expansion of its Peace Pipeline system and an increase to its monthly dividend.
* Eight of Canada's 10 main index sectors were higher.
* Among stocks, Enbridge Inc on Thursday agreed to pay $1.86 million in penalties for an alleged failure in inspecting certain lines within its Lakehead pipeline system. Shares of the pipeline operator gained 1.6 percent.
* TransCanada Corp's shares gained 0.3 percent after pressure restrictions on the pipeline operator's Keystone oil pipeline were lifted on Tuesday in a letter issued by U.S. pipeline safety regulators, a spokesman for the agency told Reuters on Thursday.
* The TSX posted two new 52-week highs and two new lows. Across all Canadian issues, there were six new 52-week highs and eight new lows.
* The largest percentage gainer on the TSX was Martinrea International, which rose 10.7 percent after the company posted first-quarter results that were above analysts' expectations.
* Enerflex Ltd was the largest decliner on the main index after the company reported quarterly revenue that missed estimates, sending its shares down 7.7 percent.
* Among the most active Canadian stocks by volume was Baytex Energy Co, which fell 4.7 percent to $5.47 after the company reported its first-quarter results on Thursday.
* Bombardier and Aurora Cannabis were also among the most heavily traded stocks.
* Volume on the TSX index was 15.64 million shares. Total volume on Friday was 23.88 million shares. (Reporting by Amy Caren Daniel in Bengaluru; Editing by Maju Samuel)