PHLX Semiconductor Index Reconstituted After Annual Review

The benchmark index integrated four new constituent stocks following its mandatory annual reconstitution.

Updated on Sept. 21, 2026 in Semiconductors

Bold flat-color editorial illustration featuring a stack of silicon wafers and geometric blocks, representing a financial index update. — The PHLX Semiconductor Sector Index underwent its annual reconstitution, replacing four constituent stocks to better reflect the current chip market landscape. AI Illustration. Upload story photo >

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The PHLX Semiconductor Sector Index finalized its annual reconstitution process, resulting in the replacement of four existing constituent stocks with four new entries. Following the announcement, the index value rose 3.7% in afternoon trading.

Why it matters

The annual reconstitution updates the index to better reflect current market activity within the chip sector. This adjustment helps maintain the benchmark's accuracy as a tracker for the broader semiconductor industry.

The index posted a 3.7% gain in afternoon trading, marking its fifth consecutive day of market growth. This performance follows the mandatory replacement of four constituent stocks during the annual review.

The players

PHLX Semiconductor Sector Index

A market-capitalization-weighted index that tracks companies involved in the semiconductor industry and serves as a primary benchmark for chip sector performance.

The details

The PHLX Semiconductor Sector Index, a benchmark tracking companies engaged in the design, distribution, manufacture, and sale of semiconductors, uses an annual reconstitution process to maintain its market representation. During this procedure, the governing body replaces constituent stocks that no longer meet the established criteria with firms that currently qualify for inclusion. The process ensures the index remains aligned with the technical and financial composition of the sector.

September 21, 2026: The index value rose 3.7% during afternoon trading.

The Tech Race

The annual index update follows the standard reconstitution pattern established for the PHLX Semiconductor Sector Index to maintain market fidelity. This move keeps the benchmark aligned with current sector trends as competing semiconductor firms adjust their positions within the broader index framework.

Investors tracking the semiconductor sector through exchange-traded funds linked to the index may see adjustments to the underlying asset allocation of their holdings. These changes reflect the new index composition and take effect immediately for market participants following the reconstitution.

The takeaway

The reconstitution confirms the ongoing effort to keep the PHLX Semiconductor Sector Index representative of current market leaders. Market watchers should monitor the upcoming quarterly disclosure of index weightings to identify which specific firms have been added to the benchmark.