S&P 500 index traded almost flat on Tuesday as investors returned from holiday. US stock index climbed 0.07% or 0.98 points and finished at 1,362.21 supported by oil shares. Marathon Oil surged 2.3% and Tesoro Petroleum gained 2%. Wynn Resorts jumped 6% on news it will purchase Japanese gambling giant Kazuo Okada's 20% stake at a large discount. Netflix tumbled 3.7% after its competitor Comcast released a new instant video streaming service.