Philadelphia Semiconductor Index Sinks 12.25% as Democrats Take Congress in Midterm Elections

The Philadelphia Semiconductor Index sank 12.25% on Thursday, and the three main US stock averages — the S&P 500, the Dow Jones Industrial Average and the Nasdaq Composite — logged their worst single session since April 2025, after midterm elections handed Democrats control of both the Senate and the House.

The Nasdaq Composite fell 5.52% in the session, a steep drop for a benchmark that carries a heavy weighting in technology shares.

The Philadelphia Semiconductor Index, commonly known by its ticker SOX, is a widely followed gauge of US-listed companies engaged in the design, manufacture, distribution and sale of semiconductors, and is frequently used as a barometer for the health of the US chip industry. Chipmakers sit at the center of technology supply chains that reach consumer electronics, data centers and vehicles, which is one reason the index is tracked closely beyond the sector itself.

Midterm elections are held every four years, halfway through a US president's term, with all 435 seats in the House of Representatives and roughly one-third of the Senate on the ballot. This week's vote handed Democrats majorities in both chambers of Congress, giving the party control of committee chairmanships and the legislative agenda on bills covering federal spending, taxation and trade — policy areas with direct relevance to the semiconductor sector. Congress has previously shaped the industry's operating environment: the CHIPS and Science Act of 2022, passed with bipartisan majorities, included roughly $52 billion in funding for domestic chip manufacturing, research and supply-chain initiatives. How the newly seated Congress handles appropriations and technology-related legislation is among the items observers will track as the session proceeds.

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