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Synopsys Shares Post Their Fifth-Largest Daily Move in Six Months

Synopsys, the chip-design software maker, is trading 6.57% higher in today’s US session, at $442.37 by 7:45pm in London, near the top of the day’s range. They closed up 4.8%.

Synopsys (NASDAQ: SNPS) shares were up 6.57% in today’s US session, at $442.37 by 7:45pm in London, closing the session up 4.78% at $434.94. The company makes electronic design automation software, the tools used to design chips, and is a constituent of both the S&P 500 and the Nasdaq 100. The rise is the fifth-largest daily move the stock has made in six months.

The shares have traded between a low of $415.24 and a high of $445.50 today, a wide range for a single session. At the close, the stock had eased off the top of that range, with a majority of the day’s rise held.

Line chart of Synopsys daily closes over the past month, with today's session highlighted as a sharp rise
Synopsys daily closes over the past month, with today’s session so far highlighted. The last point is the level at 7:45pm in London.

How unusual this is

Today’s move ranks fifth among the past 126 sessions, roughly six months of trading. Four sessions in that period saw bigger moves, so a gain of more than 5% is large for the stock but not without precedent in the half-year. Measured against that run of sessions, today stands among the biggest days the shares have had.

Chart of Synopsys daily percentage changes over six months, with today's move highlighted among the largest
Synopsys daily share-price changes over the past six months, with today’s move so far highlighted. The latest point is the level at 7:45pm in London.

Trading has been busier than usual as well. Volume so far today is 1.28 times the stock’s average over the past 20 sessions, so more shares have changed hands than on a typical day in that period. The pace of trading through the session is running at 1.51 times that average.

Synopsys has a market value of $81.59bn and is classed in the technology sector, under software infrastructure. Its level of $442.37 is as of 7:45pm in London on Wednesday 30 September 2026, with the US session still under way.

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