Synopsys Shares Plunge 35% on China Woes, Erasing 2025 Gains

Synopsys shares tumbled nearly 35% on Wednesday, putting the chip design software giant on track for its worst single-day drop on record and wiping out gains accumulated in 2025. The decline followed disappointing earnings and fresh concerns about its business in China, a key semiconductor market under tightening U.S. export restrictions.

The company reported Q3 revenue of $1.74 billion, missing analyst estimates, with weakness in its IP segment. CEO Sassine Ghazi blamed U.S. export curbs — which blocked sales of chip design software to China for more than a month — and setbacks at a “major foundry customer.” Although restrictions were lifted in July, analysts said Chinese customer confidence has eroded, leaving demand subdued.

Synopsys generates more than 10% of industry revenue from China, but geopolitical tensions have made that stream increasingly fragile. Shares of rival Cadence Design Systems also dropped nearly 7% in sympathy.

While Ghazi did not identify the foundry customer, analysts pointed to Intel, which has dramatically scaled back its 18A chip manufacturing technology and broader foundry ambitions. J.P. Morgan suggested Synopsys had dedicated significant IP resources to Intel’s program, only to see its potential curtailed.

The downturn comes as Synopsys completes its $35 billion acquisition of Ansys, a move aimed at diversifying its engineering software portfolio. However, the company also announced it will cut 10% of its workforce by 2026 as part of a strategic review.

With trade restrictions clouding its China outlook and reliance on slowing customers like Intel, Synopsys faces mounting pressure to stabilize its core business even as it integrates Ansys.