The Nasdaq-100 Index is down 9% this month — Tesla leads this list of big tech stock declines By: MarketWatch September 08, 2020 at 16:42 PM EDT The S&P 500 adds to September losses but still has gains for 2020. Read More >> Related Stocks: Adobe Systems Adv Micro Devices Apple Applied Materials Cadence Design Sys Electronic Arts Fastenal Co KLA-Tencor Corp Kraft Heinz Company Lam Research Mercadolibre Inc Microsoft Moderna Inc NDX NVIDIA Corp Nasdaq Composite Regeneron Pharmaceuticals Skyworks Solutions Splunk Inc Synopsys Inc Tesla, Inc. Workday Inc