Synopsys stock heads into the open after a 1.0% gain
Published on 09/21/2026 at 04:33 | Editorial responsibility: Rafael Müller, Editor-in-Chief AD HOC NEWS
Synopsys stock closed at USD 384.97 on the Nasdaq on September 18, 2026, gaining 1.0 percent from the prior session. The move came as semiconductor names broadly advanced, with Synopsys trading near the upper end of its recent range.
September 18, 2026 in numbers
Synopsys Inc. (ISIN US8716071076, Nasdaq: SNPS) ended the September 18, 2026 session at USD 384.97, compared with a prior close of roughly USD 381.17, corresponding to a 1.0 percent rise for the day per Nasdaq data cited by MarketBeat. The intraday trading range ran between about USD 380.65 at the low and USD 386.27 at the high, placing the close closer to the session high than the low, according to an overview of S&P 500 constituents from Cinco Dias. Trading volume for Synopsys on September 18, 2026 reached around 21.2 million shares, indicating active participation relative to typical levels, while the company’s market capitalization was reported at about 73.8 billion dollars in the same data snapshot from Cinco Dias. On September 18, 2026, the broader semiconductor space also showed gains, with the Philadelphia Semiconductor Index advancing about 2.8 percent as reported in a market brief by TradingKey, providing a favorable sector backdrop for Synopsys shares.
Today’s factors for Synopsys on September 21, 2026
Heading into today’s US session on September 21, 2026, Synopsys is positioned against a backdrop of continued interest in semiconductor and AI chip names, with recent reports highlighting renewed buying in chip stocks and a multi-day rally in the Philadelphia Semiconductor Index, as outlined by TradingKey. Broader US equity indices recently showed only modest moves while semiconductor benchmarks outperformed, with post-session coverage on September 18, 2026 noting that the Philadelphia Semiconductor Index jumped nearly 3 percent even as the Dow Jones Industrial Average slipped slightly, according to a wrap from USTV. In this environment, upcoming sector news, macroeconomic releases relevant for technology spending, and any chip design or electronic design automation updates from peers could influence demand for Synopsys shares today.
