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wrote a column · Apr 9 17:41 ·

Semiconductor index hits a new high! Confused about SOXX, SOXL, and SOXS? A comprehensive guide to the 'three brothers' of semiconductor ETFs

Driven by the dual forces of easing US-Iran tensions and the AI wave, the index known as the 'barometer' of the global semiconductor industry $PHLX Semiconductor Index (.SOX.US)$ yesterday (April 8) made a strong breakthrough, surging over 6% to hit a new all-time high.
All 30 companies included in the index closed with gains. Leaders across various segments such as memory chips, AI chips, and semiconductor equipment advanced in unison, vividly demonstrating what a collective rally of technological cornerstones looks like.
Driven by the easing of US-Iran tensions and the wave of AI, the $PHLX Semiconductor Index (.SOX.US)$ index surged strongly (on April 8), rising over 6% and hitting a record high. All 30 companies included in the index closed higher, with leaders across sectors such as memory chips, AI chips, and semiconductor equipment advancing in unison, demonstrating a collective celebration of what constitutes the bedrock of technology. For many novice investors, facing highly similar ticker symbols and confusing names of semiconductor ETFs, such asSOXX、SOXL、SOXS, confusion often arises: What are their relationships? And how can they be useful at this new peak of the index? No worries, Futubull Classroom will help clarify the origins, core differences, and application strategies of these three ETFs. The 'fourth largest index' in the US stock market: Why is it named after Philadelphia? At first glance, the three brothers share strikingly similar ticker symbols and also stem from the same 'parent'—the Philadelphia Semiconductor Index，Let’s start with this common origin. When it comes to the semiconductor industry, people often first think of Silicon Valley in California, the cradle of the world's top chip design and technology companies. However, why is the authoritative index, regarded as the 'barometer' of the industry, named after Philadelphia on the east coast of the United States? The semiconductor index does not refer to an industry hub but originates from its founding institution—the Philadelphia Stock Exchange (PHL...
For many novice investors, facing semiconductor ETFs with highly similar ticker symbols and confusing names,SOXX、SOXL、SOXSthey often feel perplexed: What exactly is the relationship between them? And what purpose do they serve now that the index has reached new highs? No worries—Futubull Classroom will guide everyone through clarifying the origins, core differences, and application strategies of these three ETFs.
Driven by the easing of US-Iran tensions and the wave of AI, the $PHLX Semiconductor Index (.SOX.US)$ index surged strongly (on April 8), rising over 6% and hitting a record high. All 30 companies included in the index closed higher, with leaders across sectors such as memory chips, AI chips, and semiconductor equipment advancing in unison, demonstrating a collective celebration of what constitutes the bedrock of technology. For many novice investors, facing highly similar ticker symbols and confusing names of semiconductor ETFs, such asSOXX、SOXL、SOXS, confusion often arises: What are their relationships? And how can they be useful at this new peak of the index? No worries, Futubull Classroom will help clarify the origins, core differences, and application strategies of these three ETFs. The 'fourth largest index' in the US stock market: Why is it named after Philadelphia? At first glance, the three brothers share strikingly similar ticker symbols and also stem from the same 'parent'—the Philadelphia Semiconductor Index，Let’s start with this common origin. When it comes to the semiconductor industry, people often first think of Silicon Valley in California, the cradle of the world's top chip design and technology companies. However, why is the authoritative index, regarded as the 'barometer' of the industry, named after Philadelphia on the east coast of the United States? The semiconductor index does not refer to an industry hub but originates from its founding institution—the Philadelphia Stock Exchange (PHL...
The 'Fourth Major Index' in the US stock market: Why is it named after Philadelphia?
At first glance, the three siblings have extremely similar ticker symbols and share the same 'parent'—the Philadelphia Semiconductor Index.，Let’s start with this common origin.
When it comes to the semiconductor industry, people often first think of Silicon Valley in California, the cradle of top chip design and technology companies worldwide. However, why is the authoritative index, regarded as the industry's 'barometer,' named after Philadelphia in the eastern United States?
The semiconductor index does not refer to an industrial hub but originates from its founding institution—the Philadelphia Stock Exchange (PHLX).It was created by PHLX in 1993, during the rise of the previous internet wave, providing global investors with a standard tool to measure and trade the performance of the entire semiconductor industry.At the end of 2007, before the financial crisis erupted, Nasdaq acquired the Philadelphia Stock Exchange, and the index was subsequently managed by Nasdaq, although its original name was retained.
Since semiconductors form the foundation of all tech hardware, $PHLX Semiconductor Index (.SOX.US)$ the movement of the index serves not only as a thermometer for measuring the semiconductor industry but also as a leading indicator for observing cutting-edge technological trends, with influence extending far beyond a single industry.After more than three decades, it has witnessed every industrial revolution, from personal computers and the internet to mobile connectivity, and now the era of AI, widely regarded by the market as the 'fourth major US index' after the Dow Jones, S&P 500, and Nasdaq.
After hitting a new all-time high yesterday, the Philadelphia Semiconductor Index has surged approximately 80-fold since its inception, far outpacing the nearly 30-fold increase in Nasdaq and the over tenfold rise in the S&P 500 during the same period.
Driven by the easing of US-Iran tensions and the wave of AI, the $PHLX Semiconductor Index (.SOX.US)$ index surged strongly (on April 8), rising over 6% and hitting a record high. All 30 companies included in the index closed higher, with leaders across sectors such as memory chips, AI chips, and semiconductor equipment advancing in unison, demonstrating a collective celebration of what constitutes the bedrock of technology. For many novice investors, facing highly similar ticker symbols and confusing names of semiconductor ETFs, such asSOXX、SOXL、SOXS, confusion often arises: What are their relationships? And how can they be useful at this new peak of the index? No worries, Futubull Classroom will help clarify the origins, core differences, and application strategies of these three ETFs. The 'fourth largest index' in the US stock market: Why is it named after Philadelphia? At first glance, the three brothers share strikingly similar ticker symbols and also stem from the same 'parent'—the Philadelphia Semiconductor Index，Let’s start with this common origin. When it comes to the semiconductor industry, people often first think of Silicon Valley in California, the cradle of the world's top chip design and technology companies. However, why is the authoritative index, regarded as the 'barometer' of the industry, named after Philadelphia on the east coast of the United States? The semiconductor index does not refer to an industry hub but originates from its founding institution—the Philadelphia Stock Exchange (PHL...
The index's compilation method aims to comprehensively reflect the overall picture of the US semiconductor industry, selecting the 30 largest semiconductor companies listed in the US, covering the entire industrial chain from chip design, manufacturing, distribution, to equipment and materials.
To balance representation and risk, the Philadelphia Semiconductor Index adopts the rule of 'modified market capitalization weighting': the weight caps for the top three companies by market value are 12%, 10%, and 8%, respectively, while the remaining companies have a weight cap of 4%, adjusted dynamically.This ensures that the index can reflect $NVIDIA (NVDA.US)$ 、 $Broadcom (AVGO.US)$ 、 $Micron Technology (MU.US)$ the influence of leading companies while avoiding excessive concentration in a single stock.
Due to its long history, well-established compilation rules, and broad representation, the SOX has long been a core barometer of the global semiconductor industry's prosperity, and is also the underlying asset for many financial derivatives. Many veterans refer to it as 'Phi Semi,' which has become one of the jargons in the investment community.
Same Origin, Different Streams: DNA Analysis of the 'Three Brothers'
Just as investors cannot directly buy or sell the 'S&P 500 Index' on the exchange but can efficiently invest in a basket of S&P 500 component stocks through $SPDR S&P 500 ETF (SPY.US)$ or $Vanguard S&P 500 ETF (VOO.US)$ , similarly, ordinary investors cannot directly trade the 'Philadelphia Semiconductor Index.' SOXX, SOXL, and SOXS are financial instruments created for this purpose.
Understanding the parent index makes the relationship between the three ETFs clear. They are all investment tools derived from the Philadelphia Semiconductor Index (SOX), but their investment objectives are completely different:
Benchmark Big Brother: $iShares Semiconductor ETF (SOXX.US)$
This is a traditional, non-leveraged ETF. Issued by iShares, under the world’s largest asset management company BlackRock, it aims to replicate and track the daily performance of the Philadelphia Semiconductor Index (SOX) as accurately as possible. When you buy SOXX, it is equivalent to purchasing a basket of 30 leading U.S. semiconductor companies according to the index weight.
Its fee rate is relatively low (0.34%), making it a core tool for long-term positioning in the semiconductor industry and achieving average market returns. It is also the 'oldest' among the three siblings, having been listed as early as July 2001, with a scale exceeding 20 billion US dollars (as of April 8, 2026, hereinafter the same).
Top 10 Holdings of SOXX
Driven by the easing of US-Iran tensions and the wave of AI, the $PHLX Semiconductor Index (.SOX.US)$ index surged strongly (on April 8), rising over 6% and hitting a record high. All 30 companies included in the index closed higher, with leaders across sectors such as memory chips, AI chips, and semiconductor equipment advancing in unison, demonstrating a collective celebration of what constitutes the bedrock of technology. For many novice investors, facing highly similar ticker symbols and confusing names of semiconductor ETFs, such asSOXX、SOXL、SOXS, confusion often arises: What are their relationships? And how can they be useful at this new peak of the index? No worries, Futubull Classroom will help clarify the origins, core differences, and application strategies of these three ETFs. The 'fourth largest index' in the US stock market: Why is it named after Philadelphia? At first glance, the three brothers share strikingly similar ticker symbols and also stem from the same 'parent'—the Philadelphia Semiconductor Index，Let’s start with this common origin. When it comes to the semiconductor industry, people often first think of Silicon Valley in California, the cradle of the world's top chip design and technology companies. However, why is the authoritative index, regarded as the 'barometer' of the industry, named after Philadelphia on the east coast of the United States? The semiconductor index does not refer to an industry hub but originates from its founding institution—the Philadelphia Stock Exchange (PHL...
Data source: Futubull
Aggressive Twins: SOXL/SOXS
Born on the same day (March 11, 2010), created by Direxion, the 'Leveraged Magician,' a company that has developed numerous leveraged ETFs. Instead of directly holding index components, they achieve an impressive goal by investing in various financial derivatives:
$Direxion Daily Semiconductor Bull 3x Shares ETF (SOXL.US)$: Aims to achieve 300% of the daily return of the tracked index (triple leverage in the positive direction). If the index rises by 1% in a day, theoretically, it rises by about 3%.
$Direxion Daily Semiconductor Bear 3x Shares ETF (SOXS.US)$: Aims to achieve -300% of the daily return of the tracked index (triple leverage in the reverse direction). If the index rises by 1% in a day, theoretically, it falls by about 3%.
Top 10 Holdings of SOXL
Driven by the easing of US-Iran tensions and the wave of AI, the $PHLX Semiconductor Index (.SOX.US)$ index surged strongly (on April 8), rising over 6% and hitting a record high. All 30 companies included in the index closed higher, with leaders across sectors such as memory chips, AI chips, and semiconductor equipment advancing in unison, demonstrating a collective celebration of what constitutes the bedrock of technology. For many novice investors, facing highly similar ticker symbols and confusing names of semiconductor ETFs, such asSOXX、SOXL、SOXS, confusion often arises: What are their relationships? And how can they be useful at this new peak of the index? No worries, Futubull Classroom will help clarify the origins, core differences, and application strategies of these three ETFs. The 'fourth largest index' in the US stock market: Why is it named after Philadelphia? At first glance, the three brothers share strikingly similar ticker symbols and also stem from the same 'parent'—the Philadelphia Semiconductor Index，Let’s start with this common origin. When it comes to the semiconductor industry, people often first think of Silicon Valley in California, the cradle of the world's top chip design and technology companies. However, why is the authoritative index, regarded as the 'barometer' of the industry, named after Philadelphia on the east coast of the United States? The semiconductor index does not refer to an industry hub but originates from its founding institution—the Philadelphia Stock Exchange (PHL...
Data source: Futubull
We can see that the top ten holdings of SOXX are relatively 'clean', all being company stocks,but SOXL contains some derivatives, and SOXS, aiming for inverse returns, is even more extreme, mostly consisting of derivatives.It's imaginable that the fees for these products would be higher due to their complex structures. SOXL’s annual fee rate is 0.75%, while SOXS’s is 0.89%.
SOXL's scale has now surpassed tens of billions of dollars, while SOXS is only at 1.1 billion dollars. This is quite understandable since who would consistently bet against an industry that is on a long-term upward trajectory?
Faced with highly similar ticker symbols, here's a simple mnemonic for fellow investors.You just need to remember what the 'key letter' at the end of each name stands for, and you can instantly distinguish their purposes! Futubull guarantees that once you've seen this, you'll never confuse them again~
SOXX: The repeated appearance of the final 'X' can be understood as a copy, meaning it is the replica that strives to track the index faithfully.
SOXL:L for Long, which means going long, triple leverage for going long, and this is where the acceleration of gains comes into play.
SOXS:S for Short, which means going short, triple leverage for going short, and this is where the inverse tool lies.
The index hits a new high, but why hasn't triple leverage for going long reached a new high?
Since SOXL is the 3x leveraged product for the Philadelphia Semiconductor Index (SOX), in theory, its net asset value should have already hit a new high when the index reached its historical peak on April 8, 2026.
But the reality is, it didn't. It surged by 19.36% yesterday, but still failed to reach a new high.
Driven by the easing of US-Iran tensions and the wave of AI, the $PHLX Semiconductor Index (.SOX.US)$ index surged strongly (on April 8), rising over 6% and hitting a record high. All 30 companies included in the index closed higher, with leaders across sectors such as memory chips, AI chips, and semiconductor equipment advancing in unison, demonstrating a collective celebration of what constitutes the bedrock of technology. For many novice investors, facing highly similar ticker symbols and confusing names of semiconductor ETFs, such asSOXX、SOXL、SOXS, confusion often arises: What are their relationships? And how can they be useful at this new peak of the index? No worries, Futubull Classroom will help clarify the origins, core differences, and application strategies of these three ETFs. The 'fourth largest index' in the US stock market: Why is it named after Philadelphia? At first glance, the three brothers share strikingly similar ticker symbols and also stem from the same 'parent'—the Philadelphia Semiconductor Index，Let’s start with this common origin. When it comes to the semiconductor industry, people often first think of Silicon Valley in California, the cradle of the world's top chip design and technology companies. However, why is the authoritative index, regarded as the 'barometer' of the industry, named after Philadelphia on the east coast of the United States? The semiconductor index does not refer to an industry hub but originates from its founding institution—the Philadelphia Stock Exchange (PHL...
This is the most crucial and often misunderstood characteristic of leveraged ETFs: they offer 'triple daily returns,' not 'triple long-term returns.'When the holding period exceeds one day, the 'decay effect' begins to take hold. You can think of it as a 'frictional heat-generating' machine built into the leveraged ETF, which activates whenever there is market volatility, consuming your momentum.
Let's use a simple two-day scenario to get an intuitive sense of this:
Assume the Philadelphia Semiconductor Index (SOX) stands at 100 points on Day 0.
Day 1: The index rises by 10%, closing at 110 points. SOXX, which tracks it, rises in tandem to 110. Meanwhile, SOXL amplifies the single-day gain to 30%, with its net asset value rising to 130.
Day 2: The index retraces 9.09% from 110 points, closing back at 100 points, precisely where it started. SOXX also falls back in tandem to 100 points.
At this point, a key question arises: Will SOXL return to its starting point?It needs to endure a drop three times the index's decline on the following day, specifically -27.27%. The net value becomes 94.5! Despite the index being unscathed after two days of fluctuations, SOXL incurred a loss of 5.5%.
This principle applies to SOXS as well. In scenarios where there is an initial rise followed by a fall (with the base amount decreasing on the first day), its net value will suffer even more (89.1 vs 94.5).
Driven by the easing of US-Iran tensions and the wave of AI, the $PHLX Semiconductor Index (.SOX.US)$ index surged strongly (on April 8), rising over 6% and hitting a record high. All 30 companies included in the index closed higher, with leaders across sectors such as memory chips, AI chips, and semiconductor equipment advancing in unison, demonstrating a collective celebration of what constitutes the bedrock of technology. For many novice investors, facing highly similar ticker symbols and confusing names of semiconductor ETFs, such asSOXX、SOXL、SOXS, confusion often arises: What are their relationships? And how can they be useful at this new peak of the index? No worries, Futubull Classroom will help clarify the origins, core differences, and application strategies of these three ETFs. The 'fourth largest index' in the US stock market: Why is it named after Philadelphia? At first glance, the three brothers share strikingly similar ticker symbols and also stem from the same 'parent'—the Philadelphia Semiconductor Index，Let’s start with this common origin. When it comes to the semiconductor industry, people often first think of Silicon Valley in California, the cradle of the world's top chip design and technology companies. However, why is the authoritative index, regarded as the 'barometer' of the industry, named after Philadelphia on the east coast of the United States? The semiconductor index does not refer to an industry hub but originates from its founding institution—the Philadelphia Stock Exchange (PHL...
This is the erosion effect: Even if the index returns to its starting point after volatility, leveraged ETFs that reset daily experience permanent losses due to the oscillations. In one-sided upward or downward trends, they can better achieve cumulative leverage effects.However, in volatile markets with heightened tug-of-war between bulls and bears, this erosion severely undermines their long-term returns.
Over time, consecutive daily gains or losses are extremely rare; volatility is the norm in the market.This is why leveraged ETFs (whether bullish or bearish) are only suitable for intraday trading or short-term holding, and are definitely not long-term investment tools.
If you're betting on a sharp rise or fall tomorrow or next week, it could be a powerful tool.But if you intend to use it to 'invest' in the semiconductor industry over the next three years, it will surely disappoint you, even if your directional bet is correct, as it won't deliver the expected gains.
Aside from erosion, higher fees are another burden for leveraged ETFs. As mentioned earlier, as tools providing complex leverage strategies, leveraged ETFs have much higher fees than regular ETFs. These costs are directly deducted from the fund’s net asset value, further impacting long-term returns.
How should the three types of ETFs be applied in the current market environment?
Considering the current backdrop of the Philadelphia Semiconductor Index hitting new highs, while geopolitical tensions and valuation pressures persist, we can plan our strategy as follows:
$iShares Semiconductor ETF (SOXX.US)$：
Suitable for investors who are optimistic about the long-term development of the semiconductor industry and wish to benefit from major trends like AI, but are unwilling to bear the risks associated with individual stock selection or extreme volatility caused by leverage.Can be used as a core position for long-term allocation or regular investment.Utilizing its characteristic of covering the entire industrial chain (design, manufacturing, equipment) to mitigate rotation risks in specific sub-sectors. After the index hits a new high, one can wait for a technical pullback to buy in batches.
$Direxion Daily Semiconductor Bull 3x Shares ETF (SOXL.US)$：
If there is a strong bullish outlook on the short-term trend (a few days or weeks), coupled with an extremely high risk tolerance and pursuit of explosive returns.Consider short-term participation when the index breaks through key resistance levels, accompanied by significant positive catalysts (e.g., better-than-expected earnings reports from leading companies, upward revision of industry capital expenditure guidance).Strict stop-loss discipline must be established, and holding positions over the long term in a volatile or range-bound market should be absolutely avoided.
$Direxion Daily Semiconductor Bear 3x Shares ETF (SOXS.US)$：
Predicting that the semiconductor sector will experience short-term adjustments or declines, this can be used to hedge existing position risks or for pure short-term short selling. After the index hits a new high,If it is believed that technical indicators have significantly diverged, market sentiment is overheated, or negative industry news emerges, it can serve as a short-term hedging or speculative tool.。Similarly, only suitable for short-term operations.
The code similarity among the three brothers is a beginner's trap and also an introductory lesson in understanding the diversity of investment tools. On the vibrant and cyclical stage of semiconductors, which tool you choose entirely depends on your investment objectives, risk tolerance, and market judgment. There is no best tool, only the most suitable strategy. While embracing the high growth potential of the semiconductor industry, never underestimate its inherent high volatility. Proper asset allocation and risk management are essential for long-term success.
Today, we took an in-depth look at the 'three brothers' in the semiconductor investment field.However, in actual investing, you may encounter more ETF products with unfamiliar codes and complex strategies. If you feel uncertain, there’s no need to panic—Futubull's investment tools can provide powerful assistance.
In the Futubull app, you can easily access detailed ETF information:
1) Enter the ETF code (e.g., SOXL) in the search bar
2) After entering the ETF details page, click on the right-hand sideFundtab
3) Here, you can view all key data in one place, including itsinvestment objectives, fees, holdings details, historical performanceand other critical metrics.
Driven by the easing of US-Iran tensions and the wave of AI, the $PHLX Semiconductor Index (.SOX.US)$ index surged strongly (on April 8), rising over 6% and hitting a record high. All 30 companies included in the index closed higher, with leaders across sectors such as memory chips, AI chips, and semiconductor equipment advancing in unison, demonstrating a collective celebration of what constitutes the bedrock of technology. For many novice investors, facing highly similar ticker symbols and confusing names of semiconductor ETFs, such asSOXX、SOXL、SOXS, confusion often arises: What are their relationships? And how can they be useful at this new peak of the index? No worries, Futubull Classroom will help clarify the origins, core differences, and application strategies of these three ETFs. The 'fourth largest index' in the US stock market: Why is it named after Philadelphia? At first glance, the three brothers share strikingly similar ticker symbols and also stem from the same 'parent'—the Philadelphia Semiconductor Index，Let’s start with this common origin. When it comes to the semiconductor industry, people often first think of Silicon Valley in California, the cradle of the world's top chip design and technology companies. However, why is the authoritative index, regarded as the 'barometer' of the industry, named after Philadelphia on the east coast of the United States? The semiconductor index does not refer to an industry hub but originates from its founding institution—the Philadelphia Stock Exchange (PHL...
Driven by the easing of US-Iran tensions and the wave of AI, the $PHLX Semiconductor Index (.SOX.US)$ index surged strongly (on April 8), rising over 6% and hitting a record high. All 30 companies included in the index closed higher, with leaders across sectors such as memory chips, AI chips, and semiconductor equipment advancing in unison, demonstrating a collective celebration of what constitutes the bedrock of technology. For many novice investors, facing highly similar ticker symbols and confusing names of semiconductor ETFs, such asSOXX、SOXL、SOXS, confusion often arises: What are their relationships? And how can they be useful at this new peak of the index? No worries, Futubull Classroom will help clarify the origins, core differences, and application strategies of these three ETFs. The 'fourth largest index' in the US stock market: Why is it named after Philadelphia? At first glance, the three brothers share strikingly similar ticker symbols and also stem from the same 'parent'—the Philadelphia Semiconductor Index，Let’s start with this common origin. When it comes to the semiconductor industry, people often first think of Silicon Valley in California, the cradle of the world's top chip design and technology companies. However, why is the authoritative index, regarded as the 'barometer' of the industry, named after Philadelphia on the east coast of the United States? The semiconductor index does not refer to an industry hub but originates from its founding institution—the Philadelphia Stock Exchange (PHL...
If you still have questions, you can directly ask the Futubull AI in the upper right corner for quick product insights and market background analysis.
Risk Disclosure: This content does not constitute a research report and is for reference only. It should not be used as the basis for any investment decision. The information involved in this article is not a comprehensive description of the mentioned securities, markets, or developments. Although the source of the information is considered reliable, no guarantee is provided regarding its accuracy or completeness. Additionally, no assurance is given regarding the accuracy of any statements, opinions, or forecasts provided herein.
Risk Disclaimer: The above content only represents the author's view. It does not represent any position or investment advice of Futu. Futu makes no representation or warranty.Read more
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