Key Highlights

● Cadence closed at $309.65 on October 22 in a broad semiconductor selloff.

● Rival Synopsys also fell, closing at $422.48.

● Cadence sells electronic design automation software used to design semiconductors.

● The Nasdaq-100 lost about $1.32 trillion in market value.

Shares of Cadence Design Systems (NASDAQ:CDNS) slid on Thursday, October 22, 2026, closing at $309.65, as the chip-design software company was pulled into a broad semiconductor selloff that hammered the Nasdaq-100.

Cadence had no company-specific news. The stock moved with the chip sector rather than on any development of its own.

Software that trades like a chip stock

Cadence sells electronic design automation software and intellectual property that engineers use to design semiconductors, from smartphone processors to the AI accelerators inside data centers. Its customers are chipmakers and the large technology companies that design their own silicon.

That position ties its fortunes to the industry's investment cycle. When investors worry that chip spending could cool, design-software stocks tend to trade alongside the semiconductor names they serve. On Thursday, that link worked against Cadence.

Its closest rival, Synopsys (NASDAQ:SNPS), also fell, closing at $422.48. Neither company issued news during the session.

What hit the chip sector

The Philadelphia Semiconductor Index posted its biggest one-day drop since June 23, according to market data. Two reports from Wednesday evening set the tone.

Meta Platforms (NASDAQ:META) showed record revenue but also enormous AI spending: a 2026 capital spending range of $135 billion to $145 billion and negative free cash flow, which marked its first cash outflow in more than a decade. Rather than cheering the spending, investors questioned how long it could be funded.

Lam Research (NASDAQ:LRCX), the chip-equipment maker, then guided December-quarter revenue to $8.6 billion, plus or minus $400 million, a midpoint slightly below what many investors had hoped for. Lam's chief financial officer said "things are going to continue to be constrained," and Lam's chief executive said clean-room and component shortages would "limit chip makers and equipment companies' ability to fully meet end demand" into 2027. Lam's shares tumbled, and KLA (NASDAQ:KLAC), Applied Materials (NASDAQ:AMAT) and ASML (NASDAQ:ASML) followed.

Comments from Nvidia (NASDAQ:NVDA)'s chief executive added to the unease. "The demand of the capital is much greater than the availability of the capital," he said.

The wider market

The Nasdaq Composite fell 694.00 points to 26,008.86, its steepest drop since June 5. The Nasdaq-100 lost about $1.32 trillion in market value, with 26 AI and chip names accounting for the bulk of the net decline. The S&P 500 dropped 93.74 points to 7,663.43, its worst day since July.

Yet the selling was concentrated. About two of every three S&P 500 stocks rose, according to market reports. Consumer staples and health care hit record highs, and Treasuries rallied, sending the 10-year yield back below a closely watched threshold for the first time since September 22.

Cadence Tracks Semiconductor Sentiment

The chip sector's next tests come quickly. Chip-testing equipment maker Teradyne (NASDAQ:TER) reports on October 27, and the earnings calendar lists Intel (NASDAQ:INTC) and Amazon (NASDAQ:AMZN) for October 29. The Federal Reserve announces its decision on Wednesday, October 28, alongside results from Microsoft (NASDAQ:MSFT) and Alphabet (NASDAQ:GOOGL), two of the biggest spenders on AI infrastructure. Investors in Cadence will be listening for any sign that chip-design budgets are changing. For now, the stock's direction appears tied to sentiment toward semiconductors as a whole.