Major chip software companies including Siemens, Synopsys, and Cadence have announced that U.S. export restrictions on chip design tools for Chinese clients have been lifted. Siemens has resumed full sales, while Synopsys and Cadence are working to restore access. This change impacts the global electronics industry, as these firms dominate the electronic design automation market. The news led to significant stock increases for Synopsys and Cadence, highlighting the importance of these tools in chip manufacturing and international trade.