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PHLX Semiconductor Index (SOX.INDX) — chart, structure and Closelook read

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Company snapshot — PHLX Semiconductor Index

SOX.INDX in five paragraphs: what it makes and sells, where it sits in the Closelook stack, who it is priced against, why we track it, what we watch. Research diary, not advice.

What it does
The PHLX Semiconductor Index, known as the SOX, tracks a broad basket of US-listed semiconductor companies, spanning chip designers, foundries, equipment makers and memory suppliers. It is calculated by Nasdaq and used across the market as a shorthand for how the chip sector is trading as a whole. It is a benchmark, not a company, so it has no products, customers or revenue of its own.
Where it sits in the stack
SOX is an index of many businesses rather than a single business, so it cannot sit in one layer of Rubin, the diary's map of the AI build-out stack. It pulls together names from design, foundry, equipment and memory layers at once, making it a rough proxy for the whole chip side of our universe rather than a seat within it.
Who it is priced against
The diary holds no peer group for an index. The comparison the market draws most often is with the SMH exchange-traded fund, which tracks a similar basket of semiconductor names and is used the same way as a sector gauge.
Why Closelook tracks it
It carries no Closelook index seat and no score; the diary treats it as a market-wide reference rather than a covered constituent, and does not quote it in the editions.
What the diary watches
The diary watches whether the index holds above its longer moving average and how far it sits below its recent peak, both markers of where the broader semiconductor cycle currently stands.

PHLX Semiconductor Index (SOX.INDX) trades on the INDX exchange.

Written from the company’s public profile and Closelook’s own readings, 2026-09-17. Descriptive, refreshed with the registry; corrections welcome via the imprint. closelook.net is an investment research diary — market structure, index membership and scores are our own readings, not investment advice. Related: index compare · sector dispersion · scanner.

Signals for this name

Every Closelook reading that exists for SOX.INDX, from the same nightly bakes the boards use. Research diary readings, not advice.

Weather around the name 3 macro readings: Money Temperature, Factor regime, Sovereign pressure

The weather around this name

Macro readings that apply by membership — the regime, the factor tape, the sector cell, the funding backdrop.

  • Money Temperature Composite 55/100 · S&P 500 fund at 58, above its 50- and 200-day averagesEight instruments scored on position, momentum, volume, volatility and fragility — the regime every name trades inside. Temperature lab → 2026-09-17
  • Factor regime Momentum leading — risk appetite buildingMomentum against low volatility (SPMO / SPLV): above its 50-day trend, 94th percentile of the window, +2.7% over 20 sessions. Factor regime → 2026-09-17
  • Sovereign pressure Index 0.00 · down 0.41 over 21 sessionsG7 long-end yields, 10s30s and the slope — the funding weather for every balance sheet on this site. Sovereign pressure → 2026-09-17

FAQ · from the current data · as of 2026-09-18

Quick answers

What is PHLX Semiconductor Index (SOX.INDX)?

PHLX Semiconductor Index trades as SOX.INDX on the INDX exchange (US) in the Closelook research universe, as of the registry build of 2026-09-18.

Is SOX.INDX in a Closelook index?

Not currently — PHLX Semiconductor Index is tracked in the Closelook research universe but is not a constituent of a Closelook functional index as of 2026-09-18.

Where does SOX.INDX trade against its moving averages?

Pullback inside an uptrend stack: Trades -2.1% vs the 50-day and +15.5% vs the 200-day average, 20.9% below the 52-week high and +94% off the 52-week low. Computed from daily closes. As of 2026-09-17 — a technical state from the nightly Closelook bake, not advice. The Technical tab carries the full row.

What does PHLX Semiconductor Index do?

The PHLX Semiconductor Index, known as the SOX, tracks a broad basket of US-listed semiconductor companies, spanning chip designers, foundries, equipment makers and memory suppliers. It is calculated by Nasdaq and used across the market as a shorthand for how the chip sector is trading as a whole. It is a benchmark, not a company, so it has no products, customers or revenue of its own. The diary holds no peer group for an index. The comparison the market draws most often is with the SMH exchange-traded fund, which tracks a similar basket of semiconductor names and is used the same way as a sector gauge.

Where does PHLX Semiconductor Index sit in the AI build-out?

SOX is an index of many businesses rather than a single business, so it cannot sit in one layer of Rubin, the diary's map of the AI build-out stack. It pulls together names from design, foundry, equipment and memory layers at once, making it a rough proxy for the whole chip side of our universe rather than a seat within it. It carries no Closelook index seat and no score; the diary treats it as a market-wide reference rather than a covered constituent, and does not quote it in the editions.

What does this page show?

A live price chart with SMA overlays and drawing tools for SOX.INDX, performance metrics, index-membership context and the Closelook structure read — an investment research diary view, not investment advice.