Group 1 - Lumentum Holdings Inc. (NASDAQ:LITE) saw a significant increase of 36.02% after reporting better-than-expected second-quarter financial results and providing third-quarter guidance above estimates [1] - Saia, Inc. (NASDAQ:SAIA) experienced a rise of 23.07% as shares of transportation companies gained amid declining oil prices [1] - Westlake Corporation (NYSE:WLK) increased by 19.27% this week [2]