Philadelphia Semiconductor Index (SOX): The Complete Guide to Components, ETFs, and Trading Strategies

The Philadelphia Semiconductor Index (SOX) tracks 30 of the largest U.S.-listed semiconductor companies and is widely regarded as the single best barometer of the global chip cycle. After a record close of 14,634.72 on June 22, 2026, followed by a sharp pullback into November, the index remains a focal point for investors positioning around the AI build-out, data-center CapEx, and the cyclical swings that have always defined this industry.

This guide breaks down the index's methodology, its 30 constituents and weighting rules, the ETFs and derivatives available to investors, how SOX compares with the Nasdaq-100 and S&P 500 Information Technology sector, and practical trading strategies for capturing upside while managing the sector's notorious volatility.

1. Why the Philadelphia Semiconductor Index Matters

Semiconductors are the building blocks of artificial intelligence, 5G, electric vehicles, cloud computing, and the Internet of Things. From the processor in a smartphone to the GPUs powering hyperscale data centers, chips play the same role in the modern economy that oil played in the industrial age. The industry is also famously cyclical and R&D-intensive: demand surges when AI and cloud CapEx accelerate, and corrections can be sharp when inventories overshoot.

The Philadelphia Semiconductor Index (SOX) was launched by the Philadelphia Stock Exchange (PHLX) in 1993 and is now maintained by Nasdaq. According to SIA data, global semiconductor sales reached roughly $627 billion in 2024, and the industry is widely expected to cross the $1 trillion revenue mark before 2030. Against that backdrop, the SOX has become a go-to proxy for whether the AI-driven chip super-cycle is still expanding.

When SOX rallies, it typically signals strong chip demand, rising earnings expectations, and capital rotating into growth sectors. When it breaks down, it often leads weakness across the broader tech complex. For anyone invested in AI, advanced manufacturing, or high-performance computing, SOX is effectively the dashboard light that flashes before the rest of tech reacts.

2. What Is the SOX Index?

The Philadelphia Semiconductor Index (SOX) is a modified market-capitalization-weighted index of 30 U.S.-listed semiconductor companies spanning design, manufacturing, equipment, and materials. It was created in 1993 and is now maintained by Nasdaq, which sets methodology, reviews constituents annually, and rebalances weights every quarter.

The index was initiated at a value of 200 on December 1, 1993, split 2-for-1 on July 24, 1995, and has options and futures products built around it. Eligible securities must be listed on a major U.S. exchange (Nasdaq, NYSE, NYSE American, or Cboe), have a market cap of at least $100 million on the reference date, demonstrate liquidity of at least 1.5 million shares traded per month across the prior six months, and have listed options in the U.S. (or be eligible for them).

2.1 Index Methodology and Weighting

SOX is not a pure cap-weighted index. It applies a tiered capping mechanism to prevent a handful of mega-caps from dominating the index:

• The three largest constituents are capped at 12%, 10%, and 8% respectively
• All other constituents are capped at 4% each
• Excess weight is redistributed proportionally to lower-weighted names

Nasdaq performs an annual reconstitution in September (reviewing the 30 constituents) and quarterly rebalances every March, June, September, and December. The caps are applied only at those rebalances, so weights drift with prices in between.

This capping rule is important because ETFs that track SOX (notably Invesco's SOXQ) inherit the exact same tiering, while competing ETFs such as iShares' SOXX track a different index (the NYSE Semiconductor Index) with its own capping rules. The difference shows up in how much exposure each fund gives to the very largest names like NVIDIA and Broadcom.

2.2 The 30 Constituent Companies

The list below is the SOX constituent list published by Nasdaq as of November 6, 2026. It spans the full value chain from design (NVIDIA, AMD, ARM) to foundry (TSM, GlobalFoundries, Intel, Tower) to equipment (ASML, AMAT, LRCX, KLAC, TER) to analog and connectivity (Texas Instruments, Analog Devices, Qualcomm, Broadcom, Astera Labs, Credo). Membership can change at the September reconstitution or after corporate events; check the Nasdaq index page for the latest list.

Ticker	Company	Sub-industry
ADI	Analog Devices, Inc.	Analog / mixed-signal
ALAB	Astera Labs, Inc.	Data-center connectivity
AMAT	Applied Materials, Inc.	Equipment
AMD	Advanced Micro Devices, Inc.	CPU / GPU
ARM	Arm Holdings plc	IP / architecture
ASML	ASML Holding N.V.	Lithography equipment
AVGO	Broadcom Inc.	Networking / custom ASIC
COHR	Coherent Corp.	Photonics / materials
CRDO	Credo Technology Group	High-speed connectivity
ENTG	Entegris, Inc.	Materials
GFS	GlobalFoundries Inc.	Foundry
INTC	Intel Corporation	IDM / foundry
KLAC	KLA Corporation	Process control
LRCX	Lam Research Corporation	Etch / deposition
LSCC	Lattice Semiconductor Corporation	FPGA
MCHP	Microchip Technology Incorporated	Microcontrollers
MPWR	Monolithic Power Systems, Inc.	Power management
MRVL	Marvell Technology, Inc.	Networking / custom silicon
MTSI	MACOM Technology Solutions Holdings, Inc.	RF / optical
MU	Micron Technology, Inc.	DRAM / NAND
NVDA	NVIDIA Corporation	GPU / AI accelerator
NXPI	NXP Semiconductors N.V.	Auto / industrial
ON	ON Semiconductor Corporation	Power / auto
Q	Qnity Electronics, Inc.	Electronic materials
QCOM	Qualcomm Incorporated	Mobile / 5G baseband
SITM	SiTime Corporation	Timing devices
TER	Teradyne, Inc.	Test equipment
TSEM	Tower Semiconductor Ltd.	Specialty foundry
TSM	Taiwan Semiconductor Manufacturing Co., Ltd. (ADR)	Leading-edge foundry
TXN	Texas Instruments Incorporated	Analog / embedded

Note that SOX is a U.S.-listed index, not a U.S.-company index. Non-U.S. firms such as ASML (Netherlands) and TSMC (Taiwan ADR) qualify as long as they meet the listing and liquidity thresholds.

2.3 How the Largest Weights Shape the Index

Because of the 12/10/8/4% tiered cap, no single company can grow without limit inside SOX. Even so, the top three names can together account for up to about 30% of the index, so the largest constituents still dominate the index's direction.

Actual weights move with prices and with every quarterly rebalance; Nasdaq publishes the current weights on its index page.

The takeaway for active traders: during AI-driven markets, NVIDIA and Broadcom have an outsized influence on daily SOX moves. Monitoring their earnings calendars, product launches (Blackwell, Rubin, MI300 series), and hyperscaler order commentary is more informative than tracking a simple 30-stock average.

2.4 Industry Representation and Market Significance

SOX is regarded as the leading indicator for the global chip cycle. Its turns often come before moves in the broader S&P 500 technology names and the Nasdaq-100. When hyperscaler CapEx guidance is revised higher, SOX typically responds first; when memory prices roll over or foundry utilization slips, the index also tends to lead tech downside. That makes the SOX a key dashboard for portfolio managers, sector specialists, and macro strategists tracking capital-expenditure momentum across U.S. technology.

3. Key Factors That Drive the SOX Index

SOX is driven by the interplay of five major forces: technology innovation, global supply-chain and geopolitical conditions, Federal Reserve policy, capital flows and sentiment, and structural drivers such as AI CapEx and the CHIPS Act subsidy regimes.

Driver	Typical Impact on SOX
Technology innovation and R&D	Successful node transitions and new AI architectures lift multiples
Global supply chain and geopolitics	Export controls and regional shocks drive volatility and short-term corrections
Fed policy and macro environment	Rate cuts and recovery are supportive; hikes and recession compress multiples
Capital flows and sentiment	ETF inflows and risk-on positioning fuel rallies; de-risking triggers sharp selloffs
AI CapEx and CHIPS Act subsidies	Hyperscaler spending and fab subsidies support multi-year bullish structural tailwind

3.1 Technology Innovation and R&D Investment

Chip competitiveness is defined by process-node leadership (7nm to 5nm to 3nm to 2nm and 1.4nm roadmaps), advanced packaging (CoWoS, FOPLP), and new architectures for AI workloads (GPUs, TPUs, custom ASICs, HBM memory). SIA data shows that semiconductor firms typically spend more than 15% of revenue on R&D, well above most manufacturing sectors. When node transitions succeed, margins expand and SOX earnings multiples expand with them. When ramps delay or yields disappoint, the index quickly re-rates lower.

3.2 Global Supply Chain and Geopolitics

Semiconductor supply chains are among the most globalized and politically sensitive in the world. Design, manufacturing, packaging and equipment are spread across the U.S., East Asia and Europe, with each region holding hard-to-replace positions. Any geopolitical friction (export controls, cross-border tensions, lithography equipment restrictions) can disrupt production and drive sharp index moves. The 2020-2022 pandemic squeeze and subsequent 2023 inventory flush are textbook examples of how quickly the sector can whipsaw.

3.3 Federal Reserve Policy and the Macro Environment

Semiconductors are a classic long-duration growth sector, so their valuations are highly sensitive to real interest rates. When the Federal Reserve (Fed) hikes, discount rates rise and future cash flows are penalized, compressing high-multiple chip stocks. When the Fed pivots dovish, capital often returns to growth and SOX can lead the rally. But if the Fed is cutting because the economy is weakening, chip demand may weaken too. Secondary macro indicators such as inflation, the ISM Manufacturing PMI, and global capital-goods orders also shape how investors handicap the next demand cycle.

3.4 Capital Flows and Market Sentiment

Sentiment and positioning matter at least as much as fundamentals for short-term SOX moves. When AI, HPC, or chip-shortage narratives dominate the headlines, semiconductor ETFs (SOXX, SMH, SOXQ) attract heavy inflows that push the index higher. When risk-off regimes kick in, the same ETFs bleed assets quickly. Tracking ETF fund flows, short interest, and the VIX alongside SOX-specific implied volatility gives a practical read on whether sentiment is stretched.

3.5 AI CapEx, Data-Center Demand, and the CHIPS Act Regime

Since 2023, the AI wave has been the single most important driver of the SOX bull market. Hyperscaler CapEx from Microsoft, Google, Amazon, and Meta has repeatedly hit new annual records, with a rising share allocated to AI servers, GPUs, networking silicon, and custom ASICs. That demand flows directly to NVIDIA, Broadcom, AMD, Micron, and the ASML/AMAT/LRCX equipment complex.

At the same time, governments are reshaping where chips are made through multi-hundred-billion-dollar subsidy programs:

• U.S. CHIPS and Science Act: Provides about $52.7 billion for U.S. semiconductor research, manufacturing and workforce programs, including roughly $39 billion in manufacturing incentives, plus an investment tax credit for new fabs.

• European Chips Act: Expected to mobilize more than EUR 43 billion in public and private investment, with a goal of raising Europe's share of global semiconductor capacity to 20% by 2030.

These programs reshape the long-term CapEx cycle and provide structural order visibility for the equipment group (AMAT, LRCX, KLAC) and leading-edge foundries (TSM, GlobalFoundries, Intel Foundry). For long-term SOX investors, understanding which regions are funding what fab is now as important as tracking NVIDIA's next product launch.

4. Historical Performance and Cyclical Characteristics

Since its 1993 launch, SOX has delivered some of the highest long-term returns of any U.S. sector index, but with sharply higher volatility. Every major technology wave, from the PC era to the smartphone era to the current AI super-cycle, has left a distinct mark on the chart.

4.1 High Volatility Tracking the Technology Cycle

SOX has historically delivered growth stock-like returns with growth stock-like drawdowns. When new applications ignite demand (PCs, mobile internet, cloud, AI), the index tends to run in multi-year rallies. When inventories overbuild or capital flows reverse, drawdowns of 30-60% are not unusual. The semiconductor cycle typically runs over several years, driven by the lag between fab investment decisions and actual production capacity.

4.2 Historical Turning Points

• 2000 dot-com bubble: SOX surged into the 2000 peak and then lost most of its value, bottoming in 2002.
• 2008 Global Financial Crisis: The index fell about 69% from its July 2007 high to its November 2008 low as capital spending collapsed, then rebounded strongly on smartphone and cloud demand.
• 2018 U.S.-China trade tensions: Export restrictions and cyclical inventory worries produced a correction of about 26%, followed by new highs in 2019.
• 2020-2021 pandemic and remote-work boom: Cloud, PC, and data-center demand pushed SOX to then-record levels.
• 2022 Fed hiking cycle: Aggressive rate hikes compressed multiples; SOX fell about 46% from its December 2021 high to its October 2022 low.
• 2023-2026 AI wave: ChatGPT-driven AI demand, led by NVIDIA, lifted the index dramatically and produced a series of record highs.
• 2026 peak and pullback: SOX set a record close of 14,634.72 on June 22, 2026, then fell sharply. It closed at 9,011.14 on November 5, about 38% below the peak, and at 10,033.93 on November 9.

The pattern is clear: SOX's drawdowns are painful but typically set up the next leg of growth as demand for the next wave of chips ramps.

4.3 Long-Term Returns vs the Broad Market

Over long periods, semiconductor indices have outperformed the S&P 500, helped by each new wave of chip demand. That outperformance has a clear price: SOX's drawdowns have been far deeper than typical broad-market corrections, from about 26% in 2018 to about 69% in 2007-2008, and even larger after the 2000 bubble.

Long-term investors who stay the course have captured the outperformance; those who mistime the cycle can suffer outsized losses. For current ETF returns, check each issuer's official performance page.

5. SOX vs Other Major Indices

SOX is a pure-play semiconductor index, while the Nasdaq-100 (NDX), S&P 500 Information Technology sector, and MSCI Global Semiconductors index each take a broader or different view. Understanding the differences is essential for sizing positions and avoiding unintended correlation risk.

5.1 SOX vs Nasdaq-100 (NDX)

The Nasdaq-100 holds the 100 largest non-financial Nasdaq-listed companies, spanning software (MSFT, GOOGL, META), e-commerce (AMZN), consumer tech (AAPL), and a growing share of semiconductors. SOX focuses on 30 pure semiconductor names.

• Number of constituents: NDX 100 vs SOX 30
• Sector purity: SOX ~100% semiconductors; NDX ~25-30% semiconductor exposure
• Volatility: SOX annualized volatility is roughly 1.3-1.5x NDX
• Cycle leadership: SOX typically turns 1-2 quarters ahead of NDX around major cyclical inflections

5.2 SOX vs S&P 500 Information Technology Sector

The S&P 500 IT sector includes semiconductors but is dominated by Apple (AAPL) and Microsoft (MSFT), which together can represent nearly half the sector weight:

• Weight structure: S&P 500 IT concentrated in AAPL + MSFT; SOX led by NVDA + AVGO + AMD
• Volatility profile: SOX > S&P 500 IT > S&P 500 overall
• Investment angle: SOX gives the cleanest exposure to AI accelerators and foundry; S&P 500 IT offers a smoother, more diversified tech allocation

5.3 SOX vs Broader Tech ETFs (SOXX vs XLK)

A common question for U.S. investors is whether to hold a pure-play semiconductor ETF or a broad technology sector ETF such as XLK (Technology Select Sector SPDR). Semiconductor ETFs have tended to deliver larger gains in chip upcycles, but with materially higher volatility, particularly during 2022 and during post-earnings swings around NVIDIA results.

5.4 SOX vs MSCI Global Semiconductors (for International Exposure)

For investors outside the U.S., or those seeking broader global coverage including Samsung and SK Hynix (which are not in SOX because they lack U.S. listings), the MSCI ACWI IMI Semiconductors & Semiconductor Equipment Select ESG Screened Capped Index is a common alternative. It is tracked by the iShares MSCI Global Semiconductors UCITS ETF (SEMI), giving access to Korean memory leaders and ESG-screened global exposure.

5.5 Four-Way Comparison Table

Metric	SOX	Nasdaq-100	S&P 500 IT	MSCI Global Semis
Constituents	30	~100	~70	Global, all sizes
Primary industries	Pure semiconductors	Broad tech + internet	Tech hardware + software	Global semis only
Top weights	NVDA, AVGO	AAPL, MSFT, NVDA	NVDA, AAPL, MSFT	NVDA, TSM, AVGO
Volatility	High	Mid-high	Medium	High
Cycle leadership	Leads tech cycle	Leads broad tech	Broad-market tech	Global semi cycle

5.6 Regional Semiconductor Indices

Beyond SOX, several Asian exchanges have launched their own semiconductor benchmarks that track the global chip cycle from regional angles:

• Nikkei Semiconductor Stock Index (launched in 2024): Covers Japan-listed semiconductor names including Tokyo Electron (8035), Advantest (6857), Disco (6146), and Renesas (6723). Heavy weight in semi equipment and materials makers, which react sensitively to NVIDIA's AI guidance and TSMC's monthly sales, so the index often echoes the previous night's SOX move.
• Taiwan Weighted Index semi exposure: TSMC is the largest weight on the Taiwan Stock Exchange, and its ADR is a SOX constituent, so Taiwan's electronics sector tends to track SOX closely.

Cross-market trading note: When NVIDIA reports earnings after the US close, Japanese equipment makers (Tokyo Electron, Advantest, Disco) often react at Tokyo's open the next morning, reflecting the supply-chain read-through. For investors seeking JPY-denominated exposure to Japanese chip stocks, the TSE-listed NEXT FUNDS Nikkei Semiconductor Stock Index ETF (200A) tracks the Nikkei index above.

6. How to Invest in the SOX Index

Investors can gain SOX exposure through U.S.-listed ETFs, UCITS ETFs (for European investors), options and futures, CFDs, and systematic dollar-cost averaging strategies. The right vehicle depends on account type, tax jurisdiction, risk tolerance, and whether you want cash-settled exposure or the ability to go short.

6.1 U.S.-Listed ETFs: SOXX vs SMH vs SOXQ

Three ETFs dominate U.S. semiconductor flows. Their differences are important because they track different indices with different capping rules, which changes how much weight each fund gives to the largest chip names.

Metric	SMH	SOXX	SOXQ
Issuer	VanEck	iShares	Invesco
Underlying index	MVIS US Listed Semiconductor 25	NYSE Semiconductor Index	PHLX Semiconductor (SOX)
Relation to SOX	Different index, 25 holdings	Different index	Tracks SOX directly

Expense ratios, distributions, assets and weights change over time; always verify on the issuer's official factsheet.

How to choose:

• Want a direct mirror of the actual SOX index? SOXQ tracks SOX itself.
• Want a different mix of chip stocks? Compare the holdings and top weights of SMH and SOXX before choosing.

One important clarification: SOXX originally tracked SOX, but BlackRock switched its benchmark in June 2021, and the fund now tracks the NYSE Semiconductor Index. If you want true-to-SOX tracking, SOXQ is the purer choice.

6.2 UCITS ETFs for European and UK Investors

U.S.-domiciled ETFs such as SOXX and SMH are typically inaccessible or tax-inefficient for European investors due to PRIIPs/KID regulations. UCITS-wrapped alternatives solve this:

ETF	Index
iShares MSCI Global Semiconductors UCITS ETF (SEMI)	MSCI ACWI IMI Semis & Equipment ESG Screened Capped
HSBC Nasdaq Global Semiconductor UCITS ETF	Nasdaq Global Semiconductor Index

Check each issuer's factsheet for current fees and fund size.

UCITS wrappers are Irish or Luxembourg domiciled, typically tax-efficient for EU and UK investors, and often include ESG screens that exclude major weapons-related holdings. Note that SEMI includes global names like Samsung Electronics and SK Hynix, which SOX itself does not, making it a broader semiconductor benchmark rather than a pure-play SOX proxy.

6.3 Options, Futures, and Derivatives

For experienced traders and institutions:

• SOXX and SMH options: Deep liquidity; weekly and monthly expiries; allow directional or volatility trades
• Single-name options on NVDA, AVGO, AMD, TSM: Highest liquidity around earnings; commonly used for event-driven positioning
• Futures: CME-listed E-mini Nasdaq-100 futures are commonly used as a broader tech proxy for semiconductor exposure

Derivatives offer leverage and the ability to hedge, but require careful management of theta decay, implied volatility crush post-earnings, and margin risk.

6.4 CFDs and Other Leveraged Instruments

Contracts for Difference (CFDs) allow two-way exposure with leverage to some SOX constituents, such as NVIDIA, Broadcom and Micron. Advantages include:

• ① Flexible long/short trading without borrowing shares

• ② Capital efficiency through margin-based positioning

• ③ Accessible sizing for testing strategies

Before trading chip exposure via CFDs, it helps to familiarize yourself with U.S. equity-index CFDs such as US500 to understand overnight financing, margin requirements, and how gap risk behaves around earnings. CFDs are high-risk instruments best suited to short-term tactical strategies with strict risk controls. Regulatory availability varies by jurisdiction; U.S. retail investors are generally restricted from CFDs.

6.5 Retirement Accounts and Dollar-Cost Averaging

For investors using tax-advantaged accounts (US 401(k) / IRA, UK ISA / SIPP, Japan NISA, Australia Super Fund, etc.), semiconductor ETFs are well suited to systematic contribution strategies. One common approach is a barbell portfolio: combine high-growth AI-linked exposure (semiconductor ETFs) with quality value stocks to dampen volatility, rebalancing when one side stretches materially.

Practical guidelines for retirement portfolios:

• A common guideline is to keep total semiconductor allocation at 5-15% of the equity portion, depending on age and risk tolerance
• Use dollar-cost averaging monthly or quarterly to smooth entry across the cycle
• Rebalance annually to trim large winners and reload laggards
• Pair with broad-market core holdings (S&P 500, total world) so the semiconductor slug remains a satellite

7. Trading Strategies for the SOX Index

Three strategies work particularly well on SOX given its high volatility and leading-cycle behavior: trend following, counter-cyclical positioning, and event-driven trading. All three require disciplined risk management.

7.1 Trend Following

SOX is one of the most reliable trend-following tapes in U.S. equities because cyclical moves tend to persist for quarters, not days. A classic playbook:

• Moving-average system: 50-day EMA and 200-day EMA. Golden-cross and death-cross signals are widely used on SOX
• Trend strength filter: Require ADX > 25 to confirm the trend is established, avoiding whipsaws during range-bound regimes
• Position sizing: Add on pullbacks to the rising 50-day EMA; exit when the 50-day EMA crosses below the 200-day EMA

When SOX trades above its rising 200-day EMA and the 50-day EMA is above the 200-day, the bias is clearly bullish. The opposite configuration warns of a cyclical correction.

7.2 Counter-Cyclical and Contrarian Positioning

Because semiconductor cycles are deep and observable, contrarian positioning at cycle lows is a common long-term approach:

• Historical cycle lows: The 2008 financial crisis, the 2018 trade-war correction, and the 2022 rate-hike bottom all marked deep SOX drawdowns and were followed by multi-year rallies
• Valuation signals: Watch whether forward P/E and price-to-book for the sector have fallen back toward the low end of their historical ranges
• Staged entries: Scale in over 3-6 months rather than attempting to catch the exact bottom

The risk with this "left-side" trading is that fundamentals can deteriorate further before inflecting; size conservatively and pre-define a maximum drawdown tolerance.

7.3 Event-Driven Trading

SOX reacts sharply to a predictable set of catalysts:

• FOMC meetings: Rate decisions and the dot plot often drive large single-session SOX moves
• NVIDIA earnings: Wall Street treats NVIDIA's earnings as a macroeconomic indicator for the AI trade, not a single-company event. Expect elevated implied volatility into the print and potential large gaps in the stock, with knock-on effects across SOX
• TSMC monthly revenue and quarterly results: The world's leading-edge foundry sets the tone for global chip demand
• CHIPS Act grant announcements and geopolitical headlines: Export-control changes and subsidy disbursements frequently move the equipment complex (AMAT, LRCX, KLAC)
• Hyperscaler CapEx guidance: Quarterly updates from Microsoft, Google, Amazon, and Meta directly impact NVIDIA and AMD

Event-driven traders should plan entries and exits before the event, define maximum position size based on IV-implied expected move, and consider defined-risk structures (spreads rather than naked options) to manage tail risk.

7.4 Risk Management

Regardless of style, SOX's volatility demands strict risk discipline:

• ① Leverage limits: When trading CFDs or futures on SOX-related products, use more conservative leverage than you would on a broad index

• ② Stop-loss discipline: Use technical invalidation levels; cap single-trade loss at 1-2% of account equity

• ③ Correlation management: Avoid stacking SOX + Nasdaq-100 + individual mega-cap tech positions, since they share heavy exposure to NVIDIA and Broadcom

• ④ Overnight carry cost: CFD overnight financing adds up; for multi-month positions, a spot ETF (SOXX, SMH, SOXQ) or direct stock is usually more cost-effective

• ⑤ Liquidity windows: Avoid sizing up into thin markets just before FOMC decisions or NVIDIA earnings, when slippage can widen

7.5 Checking Chip-Stock Correlations

SOX constituents often move together, but how closely they move changes over time. Titan FX's US Stock Correlation Ranking shows the correlation between large U.S. stocks and lists the most and least correlated pairs.

If you hold several chip stocks, check their correlations first. The closer a value is to 1, the more similar the price moves, and the less diversification you get.

Correlations are calculated from past prices, so the relationship can change.

Open the US Stock Correlation Ranking

8. Frequently Asked Questions

Q1. How is the SOX Index different from the Nasdaq-100 or S&P 500 IT sector?

SOX is a pure-play semiconductor index of 30 companies focused on chip design, manufacturing, equipment, and materials. The Nasdaq-100 is broader, including software, internet, and consumer technology; the S&P 500 IT sector is dominated by Apple and Microsoft. SOX therefore has higher volatility than either benchmark but gives the cleanest exposure to the chip cycle. It is widely used as a leading indicator for the broader tech complex.

Q2. Can the SOX Index keep rallying on AI demand?

The outlook depends on three factors. First, hyperscaler CapEx: if Microsoft, Google, Amazon, and Meta continue to revise AI CapEx higher, NVIDIA, Broadcom, AMD, and the equipment complex should benefit. Second, inference demand: as AI moves from training to deployment at scale, inference-optimized chips (AMD, custom ASICs, edge AI) support the next leg. Third, risk factors: disappointing AI ROI, a hyperscaler spending pause, or escalating export controls could trigger a cyclical pullback. Historically, even within structural growth cycles, SOX has delivered 30%+ corrections; disciplined position sizing and staged entries remain essential.

Q3. Does the SOX Index include non-U.S. companies like TSMC and ASML?

Yes. SOX is a U.S.-listed index, not a U.S.-company index. Taiwan Semiconductor (TSM ADR) and ASML Holding (U.S.-listed shares) both qualify. However, companies that only trade on foreign exchanges, such as Samsung Electronics (Korea) and SK Hynix (Korea), are not included. Investors wanting Korean memory exposure should consider the MSCI Global Semiconductors benchmark instead.

Q4. Does the SOX Index pay dividends?

No. SOX is a price return index and does not reinvest dividends. However, ETFs that track SOX or related semiconductor benchmarks (SOXX, SMH, SOXQ) pass dividends through to shareholders. Distribution frequency depends on each fund; check the issuer's latest information. For long-term investors, the total return on SOX-tracking ETFs has materially exceeded the price index due to dividend reinvestment.

Q5. How correlated is SOX with NVIDIA's earnings?

Very high in the current AI cycle. NVIDIA is one of the index's largest weights and carries outsized market influence because hyperscaler AI CapEx is the single largest demand driver. Many analysts treat NVIDIA earnings as a bellwether for the whole AI trade. SOX often makes a large move in the session after NVIDIA's results, and event-driven traders specifically target the NVIDIA earnings window as a SOX catalyst.

Q6. Should I hold semiconductor ETFs in tax-advantaged retirement accounts?

Semiconductor ETFs can be a productive satellite holding in tax-advantaged retirement accounts (US 401(k) / IRA / Roth IRA, UK ISA / SIPP, Japan NISA / iDeCo, Australia Super Fund, etc.) thanks to their long-run outperformance and favorable tax treatment under tax-deferred or tax-exempt structures. Individual country rules vary significantly — in particular, US dividend withholding may not be fully recoverable within non-US tax-exempt wrappers — so consult a qualified local tax adviser before implementation. A typical guideline: cap semiconductor exposure at 5-15% of the equity portion of a retirement portfolio, with broad-market index funds (S&P 500 or ACWI) as the core.

Q7. What is the difference between SOXX and the SOX index itself?

The SOX (PHLX Semiconductor Sector Index) is a benchmark index maintained by Nasdaq. SOXX is the iShares ETF originally designed to track SOX, but in June 2021 BlackRock switched SOXX's benchmark, and the fund now tracks the NYSE Semiconductor Index. The two indices are similar in spirit but apply different rules and can produce different returns. If you want a fund that truly mirrors SOX, the Invesco SOXQ ETF tracks the actual PHLX Semiconductor Sector Index with the exact 12/10/8/4% tiered cap.

Q8. How long does a semiconductor cycle typically last?

There is no fixed length; a full semiconductor cycle usually takes several years and can be divided into four phases:

• Expansion: New applications drive demand; inventories are lean; fabs add capacity
• Plateau: Revenue records are set but year-over-year growth rates start decelerating; share prices often lead the turn
• Contraction: Demand softens; inventory corrections ripple through the supply chain; SOX often suffers deep drawdowns
• Recovery: Inventories normalize; new applications emerge; the index often turns before the fundamentals do

Understanding where you are in the cycle is central to sizing exposure, rebalancing, and avoiding late-cycle buying.

9. Key Takeaways

The Philadelphia Semiconductor Index (SOX) is the definitive benchmark for the global chip cycle. Understanding its structure, drivers, and trading behavior is essential for any investor positioning in the AI era.

Key points from this guide:

• ① Structure: 30 U.S.-listed semiconductor companies; modified cap-weighted with 12/10/8/4% tiered caps; rebalanced quarterly, reconstituted annually in September

• ② Record high: SOX set a record close of 14,634.72 on June 22, 2026, then pulled back sharply into November

• ③ Long-term performance: Semiconductor indices have outperformed the S&P 500 over long periods, with much deeper drawdowns

• ④ Five key drivers: Technology innovation, supply chain and geopolitics, Fed policy, capital flows and sentiment, and AI CapEx plus chip subsidies

• ⑤ Investment vehicles: SOXQ (tracks SOX), SOXX (NYSE Semiconductor Index), SMH (MVIS 25), UCITS alternatives like SEMI for European investors, options, futures, and stock CFDs

• ⑥ Trading playbook: Trend following with EMA crossovers, contrarian positioning at cycle lows, and event-driven trading around NVIDIA earnings, FOMC meetings, and TSMC results

As AI, 5G, automotive electronics, and high-performance computing continue to drive secular demand, semiconductors remain a structural growth sector. SOX is the lens through which professional and retail investors alike track that story. Monitor index levels, constituent earnings, and chip-subsidy progress together, pair your exposure with disciplined risk management, and the sector's volatility can be captured rather than feared.

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Further Reading

• NVIDIA Stock Guide
• Broadcom Stock Guide
• What Is an ETF?

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Primary Sources (by Category)

• Official data and index methodology: Nasdaq — PHLX Semiconductor Sector Index methodology, SOX constituent list (November 6, 2026) and daily closing levels; U.S. CHIPS and Science Act / European Chips Act — official government documents
• Chart: TradingView, PHLX Semiconductor Index (SOX) monthly
• Market, ETF and industry data: Bloomberg — historical index performance and constituent financials; Semiconductor Industry Association (SIA) — global sales and R&D data; BlackRock iShares, VanEck, Invesco — ETF factsheets (SOXX, SMH, SOXQ)
• Titan FX tools: Titan FX Research US Stock Correlation Ranking, viewed November 10, 2026