(Updates prices, sectors) Aug 3 (Reuters) - Canada’s main stock index rose on Tuesday after a long weekend, with technology stocks leading the gains, while official data showed domestic factory activity in July grew at its slowest pace in five months. * The technology sector gained 1.2% with major tech stocks including Shopify Inc and Constellation Software Inc among the top contributors. * Canadian factory activity in July grew at the slowest pace in five months as supply chain pressures brought on by the COVID-19 pandemic weighed, data showed. However, the rate of expansion remained firm. * At 9:41 a.m. ET (13:41 GMT), the Toronto Stock Exchange’s S&P/TSX composite index was up 43.24 points, or 0.21%, at 20,331.04. * The energy sector dropped 1.5% as U.S. crude prices were down 1.8% a barrel, while Brent crude lost 1.5%. * The financials sector gained 0.1%. The industrials sector rose 0.2%. * The materials sector, which includes precious and base metals miners and fertilizer companies, lost 0.7% as gold futures fell 0.4% to $1,811 an ounce. * On the TSX, 96 issues were higher, while 129 issues declined for a 1.34-to-1 ratio to the downside, with 21.03 million shares traded. * The largest percentage gainers on the TSX were e-commerce giant Shopify Inc, which jumped 4%, and forest products company Canfor Corp, which rose 3.9%. * Bausch Health Cos Inc fell 4.9%, the most on the TSX, after the drugmaker said it planned to pursue an initial public offering of its medical aesthetics business Solta Medical. * The second biggest decliner was miner Lithium Americas , down 4.5%. * The most heavily traded shares by volume were Bank of Montreal, Suncor Energy Inc, and Tamarack Valley Energy Ltd. * The TSX posted no new 52-week highs and no new lows. * Across all Canadian issues there were 89 new 52-week highs and five new lows, with total volume of 42.93 million shares. (Reporting by Amal S in Bengaluru; Editing by Shailesh Kuber) Our Standards: The Thomson Reuters Trust Principles.