The Wall Street Journal , citing sources familiar with the situation, reported on Friday that Amazon.com Inc. amzn, +0.03% had warned its employees they might have to relocate to the main office in a larger city. The newspaper reported that Amazon managers are informing employees of smaller offices that they may be relocating to the “main hubs” such as Seattle’s headquarters, New York or San Francisco. It is not clear how many employees may be affected. Amazon’s Brad Glasser, a spokesman for the company, said that there was more energy and collaboration since employees were working together three days a week. Glasser stated that “we continue to explore the best ways to bring together more teams in the same location, and we will communicate directly with our employees when we make decisions which affect them.” Glasser also said that any employees who are asked for relocation would be eligible for relocation benefit. Amazon’s stock is up 55% this year compared to the S&P 500, which has risen around 18%. SPX, +0.03%