Quick answer (June 2026): Of the five most-traded US AI & semiconductor ETFs, SOXQ leads 2026 YTD at roughly +96.7% thanks to higher memory and networking-chip weight, SMH (Top 10 ≈ 73%) is the most concentrated NVIDIA + TSMC bet, SOXX is the most diversified semi-only fund (Top 10 = 57.4%), AIQ spreads across 86 global AI names at 0.68% TER, and BOTZ is really an industrial-automation fund disguised as AI.
1. Five ETFs at a glance
There are over 100 US AI & semi ETFs, but only five matter for most retail investors. Here is the snapshot as of mid-2026.
| Ticker | Issuer | Inception | Expense ratio | AUM | Holdings | Profile |
|---|---|---|---|---|---|---|
| SOXX | iShares (BlackRock) | 2001 | 0.35% | ~$33-40B | 34 | Broad semi, passive |
| SMH | VanEck | 2011 (re-listed) | 0.35% | $63.04B | 25 | Mega-cap concentrated |
| SOXQ | Invesco | 2021 | 0.19% | ~$1.2B | 30 | Low-cost PHLX index |
| AIQ | Global X (Mirae) | 2018 | 0.68% | $9.76B | 86 | Broad AI + Big Data |
| BOTZ | Global X (Mirae) | 2016 | 0.68% | $3.36B | ~45 | Robotics & industrial automation |
Source: iShares, VanEck, Invesco, Global X official fact sheets (March 31 – May 29, 2026).
2. The expense-ratio trap — what you actually pay
US ETFs disclose a single “total expense ratio,” but real cost includes the bid-ask spread and tracking difference. Once you add those in:
| Ticker | Headline ER | Avg spread | Tracking diff (12M) | All-in |
|---|---|---|---|---|
| SOXX | 0.35% | 0.02% | ±0.05% | ~0.37% |
| SMH | 0.35% | 0.01% | -0.03% / +0.10% | ~0.36% |
| SOXQ | 0.19% | 0.04% | ±0.05% | ~0.23% |
| AIQ | 0.68% | 0.05% | ±0.10% | ~0.73% |
| BOTZ | 0.68% | 0.08% | ±0.15% | ~0.76% |
On a $100,000 ten-year hold, SOXQ costs roughly $2,300 while AIQ/BOTZ cost ~$7,300 — a $5,000 gap that compounds.
3. Concentration — why “semiconductor ETF” is misleading
This is the most important table. SOXX, SMH and SOXQ all cover US-listed semis, but the weighting rules differ.
| Rank | SMH (Top 5) | SOXQ (Top 5) | SOXX (Top 5, May 29) |
|---|---|---|---|
| 1 | NVDA 19.35% | NVDA 12.56% | AVGO 6.90% |
| 2 | TSM 11.70% | AVGO 10.30% | NVDA 5.88% |
| 3 | AVGO 7.72% | MU 6.97% | AMD ~5.0% |
| 4 | ASML 5.02% | MRVL 5.16% | AMAT ~4.8% |
| 5 | AMD 4.73% | AMD 4.32% | MU ~4.5% |
| Top 10 total | ~73% | ~59% | 57.4% |
SMH is essentially “buy NVIDIA at 19% plus TSMC at 11.7%.” SOXX spreads the load across NVIDIA, AVGO, AMD, AMAT, MU, LRCX, KLAC and TXN — equipment (AMAT/LRCX/KLAC) and memory (MU) carry roughly double the weight versus SMH. SOXQ sits between them.
AIQ is a different animal — 86 holdings, Top 10 only 35.51%, with NVIDIA, Microsoft, Alphabet, Meta, Apple and Amazon at 4-7% each, plus Samsung, TSMC, Toyota and Sony in the international sleeve (71% US allocation per Global X). BOTZ leads with ABB 8.8%, NVDA 8.5%, Keyence 7.9%, Fanuc 7.7% and Intuitive Surgical 7.3% — industrial 45%, IT 33%, healthcare 11%. It is closer to an industrial-automation fund than to a semi fund.
4. Returns — a 30-point spread on the same theme
| Ticker | 2026 YTD (~Jun 6) | 1-year | 3-year CAGR | 5-year CAGR |
|---|---|---|---|---|
| SOXQ | +96.7% | +165% | +59.4% | n/a (2021 inception) |
| SMH | +77.1% | +138% | +64.2% | +33% |
| SOXX | ~+79.5% | ~+140% | +50% | +30% |
| AIQ | ~+35% | +28% | +30% | +18% |
| BOTZ | ~+28% | +22% | +12% | +5% |
As of 2026-06-06. SMH/SOXQ YTD: 24/7 Wall St., 2026-06-04. 3- and 5-year figures from etf.com and Morningstar.
The reason SOXQ outran SMH in 2026 is simple: Micron and Marvell carry roughly double the weight versus SMH. As AI data-center spending rotated from GPUs into HBM memory and Ethernet switching silicon in early 2026, those names ran hardest and SOXQ absorbed it most directly.
5. Risks
- Volatility: Semi ETFs have 35-45% annualized standard deviation — more than double the S&P 500. SOXX was -36% and BOTZ -42% in 2022.
- Single-stock risk: An NVIDIA 30% drawdown alone takes SMH down 5.7%.
- FX: All five are USD-denominated. No hedged share classes.
- Sector clustering: AIQ and BOTZ look diversified by name count but co-move tightly.
- Geopolitics: US export controls and Taiwan-Strait risk hit every semi ETF simultaneously.
- Liquidity: SOXX, SMH, SOXQ and AIQ trade hundreds of millions per day. BOTZ is thinner ($50-80M/day).
6. How they compare to Korean semi ETFs
Domestic Korean AI/semi ETFs (KODEX AI반도체, TIGER AI반도체핵심소재) are effectively Samsung + SK Hynix bets — 30-40% in two names. US ETFs are NVIDIA-, AVGO-, TSM- centric, so AI exposure is more direct but FX risk is real for Korean investors. We will publish a side-by-side KR vs US comparison in the next post in this series.
The same pattern showed up in our quantum-ETF series: US quantum ETFs ran +120% while Korean ones did about +60% — US themes tend to outperform their Korean counterparts in the same theme by a wide margin during super-cycle phases.
7. Which one fits which investor?
- Aggressive (want NVIDIA beta): SMH. 19% NVDA + 11.7% TSM captures the AI alpha most directly.
- Balanced (diversify but keep fees low): SOXQ. 0.19% ER, NVDA + AVGO + MU + MRVL + AMD diversification, leading 2026 YTD.
- Defensive (afraid of single-stock risk): SOXX. 34 names, Top 10 at 57.4%, longest track record (2001 inception).
- Broad AI exposure (want big tech too): AIQ — but the 0.68% fee is the cost of admission.
- Robotics & automation focus: BOTZ as a satellite, not a core position.
After 1-year returns of +130-165%, dollar-cost-averaging over 3-6 months is more prudent than a lump-sum buy at current levels.
8. FAQ
Q1. SMH or SOXX for a single pick? Over the last decade SMH beat SOXX by roughly 3.5%/yr, but that was NVIDIA + TSMC alpha. If AI leadership broadens, SOXX should narrow the gap.
Q2. Why did SOXQ outperform SMH in 2026? Memory and networking-chip weight is roughly double SMH’s, so the 2026 HBM/Ethernet rally hit SOXQ hardest.
Q3. Tax for Korean investors? Same as other US equities — KRW 2.5M annual exemption then 22% capital-gains tax; dividends 15% withholding. Separate from income tax.
9. Related
- US Quantum-Computing ETFs Complete Guide (May 2026)
- Korean Quantum-Computing ETFs Comparison (May 2026)
- (Next) Korean AI & Semiconductor ETFs — KODEX, TIGER, SOL vs SOXX/SMH
Source: https://www.ishares.com/us/products/239705/ishares-semiconductor-etf