Direct Answer
The PHLX Semiconductor Sector Index is a rule-based measurement of semiconductor industry benchmark, maintained by Nasdaq. Like every index it owns nothing: it is a number produced by applying a published weighting formula to a selected list of companies, revised on a schedule the provider sets.
What this index covers
The PHLX Semiconductor Sector Index covers semiconductor industry benchmark, within the United States market. Nasdaq defines which securities are eligible, how they are selected from that pool, and how much each one contributes to the published number.
The index name does not state a fixed company count, so the number of constituents follows the eligibility rules rather than a target.
How constituents are weighted
Swoopr has not verified the weighting method for this index against Nasdaq's current methodology document, so none is stated here rather than guessed. The provider link below is authoritative.
What qualifies for inclusion
The index is designed to measure the performance of the 30 largest US-listed semiconductor companies.
Eligibility rules are the part of an index most readers never look at and the part that decides what it can possibly measure. A screen that excludes a whole sector, or admits only one listing venue, shapes the result far more than any day of trading does.
The rule that surprises people
Swoopr has read only the index description in this document. The remaining rules are not restated here rather than paraphrased from a partial read.
References
- Nasdaq: PHLX Semiconductor Sector Index Methodology, as published 2026. Every rule described on this page is taken from this document.
Current PHLX Semiconductor Sector Index constituents
Nasdaq publishes and licenses the PHLX Semiconductor Sector Index constituent list. Swoopr does not republish it here. The provider's own page is the authoritative source for current membership and weights.
Related reading
- All stock market indexes: how indexes are built, weighted and revised.
- United States indexes: others covering the same region.
- Index concentration: measuring how much of an index sits in its largest holdings.
- Index rebalancing and inclusion effects: what happens to a stock when index membership changes.
Frequently Asked Questions
Who maintains the PHLX Semiconductor Sector Index?
Nasdaq maintains the PHLX Semiconductor Sector Index and publishes the methodology document that defines its eligibility and weighting rules.
What does the PHLX Semiconductor Sector Index measure?
It measures semiconductor industry benchmark. The index is a calculated number applying a weighting formula to a selected list of companies, and it holds nothing itself.
Where can I see the current PHLX Semiconductor Sector Index constituents?
Nasdaq publishes the current constituent list. Swoopr does not republish it, because index providers license constituent data and Swoopr holds no such licence.