Equal-Weight S&P 500 (RSP) vs Nasdaq 100 (QQQ): The Equal-Weight Hub

RSP closed at $200.17 on April 29, 2026 with assets under management of $87.10 billion as of April 14, 2026 and an expense ratio of 0.20 percent annually. QQQ closed at approximately $657.55 the same day with the Magnificent Seven representing approximately 40 percent of fund weight. SPY traded at approximately $712 with the same Magnificent Seven names representing approximately 33 percent of SPY weight versus only 1.3 percent in RSP.

Year-to-date 2026 performance shows RSP +1 percent through late March (when SPY was -4 percent), with RSP outpacing SPY by approximately 5 percentage points through mid-April 2026. This is the largest sustained RSP-versus-SPY outperformance in 5 years, suggesting either the start of a multi-year mega-cap-fatigue cycle or a temporary factor-flow reversion. The April 2026 setup also has DIA at approximately $488.67, IWM at $270.95, EFA at approximately $100-104, and EEM at $62.67. The full RSP comparison universe is captured below in dedicated sections.

The structural argument for equal-weight equity exposure begins with concentration math. As of February 2026, the top 10 companies in SPY represented approximately 39 percent of total market capitalization. The Magnificent Seven (Apple, Microsoft, Alphabet, Amazon, Nvidia, Meta, Tesla) represented approximately 33 percent of SPY weight. In RSP, each of the 500 constituents holds approximately 0.2 percent weight, meaning the Mag-7 collectively represents only 1.3 percent of fund weight (7 stocks at 0.2 percent each).

The consequence: SPY direction is now disproportionately determined by mega-cap-tech earnings and AI-cycle sentiment. Just 2 percent of S&P 500 constituents (the top 10 names) determine over 30 percent of SPY direction, a level of concentration last seen in 1999 to 2000. RSP eliminates this dynamic by mechanical quarterly rebalancing back to equal weight. The structural concentration argument has held since the 1970s but only became materially relevant for performance after 2014, when mega-cap tech began outperforming sustainedly.

QQQ holds the Nasdaq 100 with approximately 40 percent weight in the Magnificent Seven plus another 15 to 20 percent in semiconductors and other tech-adjacent names. RSP holds 500 names equally weighted across all sectors. The pair captures the cleanest single-pair test of "is mega-cap tech concentration driving the market".

QQQ has dramatically outperformed RSP from 2014 through 2024: QQQ returned approximately +650 percent over the decade versus RSP at approximately +200 percent. The 450 percentage point underperformance of RSP reflects the entire decade of mega-cap-tech leadership. The 2024 to 2026 reversal: QQQ has outperformed RSP by approximately 8 percentage points across 2024 to 2025 then RSP has outperformed by approximately 5 percentage points YTD 2026. The current relative performance is RSP/QQQ ratio at near-decade lows, suggesting either continued mean reversion (RSP catching up) or sustained mega-cap tech leadership reasserting itself. The forward signal: when RSP outperforms QQQ for two consecutive quarters, broader market breadth has improved meaningfully and the mega-cap-tech rally is exhausting.

The RSP versus SPY comparison is the cleanest test of "does cap-weighted concentration matter for returns". Both ETFs hold the same 500 stocks; the only difference is weighting methodology. RSP returns therefore equal SPY returns minus mega-cap return contribution plus equal-weight rebalance benefit.

Mathematically: if all 500 stocks delivered identical returns, RSP and SPY would deliver identical returns. RSP outperforms when median stocks outperform mega-cap stocks (the 2024 to 2026 setup). RSP underperforms when mega-cap stocks outperform median stocks (the 2014 to 2023 setup). Long-term, RSP has slightly outperformed SPY since 2003 inception (compounded annualized return roughly 11.0 percent versus 10.5 percent through 2024) because the equal-weight rebalance captures mean-reversion gains over multi-year cycles. The current 2026 setup with RSP outpacing SPY by 5pp YTD reflects either the start of a multi-year mega-cap-fatigue cycle or the beginning of broader market participation that historically precedes the late-stage of bull markets.

DIA tracks the 30-stock Dow Jones Industrial Average using price-weighting (the highest-priced stocks dominate the index). UnitedHealth at $367 has roughly 4x the influence in DIA as Verizon at $40, regardless of company size or earnings. RSP equal-weights 500 stocks, eliminating both cap-weighting and price-weighting distortions.

The DIA versus RSP comparison highlights a different concentration problem: DIA has only 30 stocks but is dominated by the highest-priced ones. RSP has 500 stocks each at 0.2 percent. DIA does not include any of the top 5 mega-cap tech names directly because they are not Dow components (Apple, Microsoft, and a few others are; Tesla, Meta, Alphabet, Amazon are not). Year-to-date 2026 DIA performance has been approximately +5 percent versus RSP +6 percent and SPY -2 percent, with DIA benefiting from its industrial and healthcare overweights during the value-rotation phase. The historical pattern: DIA and RSP are highly correlated (>0.92) because both avoid mega-cap-tech concentration, but DIA carries 30-stock idiosyncratic risk while RSP smooths through 500 names.

IWM tracks the Russell 2000 (small-cap stocks roughly $300 million to $5 billion market cap) using cap-weighting. RSP tracks the S&P 500 (large-cap stocks $5 billion to $3 trillion market cap) equal-weighted. The pair captures two simultaneous axes: large-cap-vs-small-cap AND equal-weight-vs-cap-weight.

April 2026 prices: RSP $200.17, IWM $270.95. Year-to-date returns: RSP +6 percent, IWM +6 percent (similar). Over 24 months: RSP +18 percent, IWM +25 percent. The IWM outperformance over RSP across 24 months is unusual and reflects two factors: small-caps benefiting from expected Fed cuts via floating-rate-debt sensitivity, and equal-weight large-cap RSP underperforming during a period when cap-weighted SPY also underperformed. Practical use: pairing RSP with IWM gives the broadest possible US equity exposure (700 effective names across cap-weight and equal-weight large/small dimensions). Combined RSP-IWM allocation captures roughly 95 percent of US-equity-market signal at substantially lower mega-cap concentration than SPY-only.

EFA tracks the MSCI EAFE index of developed-international equities (Europe, Australasia, Far East) using cap-weighting. RSP tracks US S&P 500 equal-weighted. The pair captures US-versus-international with breadth normalized on the US side.

April 2026 prices: RSP $200.17, EFA approximately $103. Year-to-date 2026 EFA has returned approximately +12 percent (driven by European industrials and Japanese exporters benefiting from yen weakness) versus RSP at +6 percent, an unusual EFA outperformance reflecting both Europe-Japan recovery and dollar-weakness benefit for unhedged USD investors. Over 24 months EFA returned approximately +20 percent versus RSP at +18 percent (similar). Long-term, EFA has dramatically underperformed US equity (RSP, SPY, or otherwise) across 2010 to 2024, with the gap exceeding 200 percentage points compounded over 14 years. The 2025 to 2026 EFA outperformance is the first sustained reversal of this trend. Forward signal: if EFA continues outperforming RSP for 12+ months, the 14-year US-exceptionalism cycle is breaking; this would have major asset-allocation implications.

EEM tracks the MSCI Emerging Markets index (China, India, Korea, Brazil, Taiwan, etc.) using cap-weighting. EEM has substantial single-country concentration (China alone is roughly 25 percent of EEM weight). RSP tracks US equal-weighted. The comparison captures one of the largest possible breadth differentials: 500 US large-caps equal-weighted versus 1,400+ EM stocks but with heavy China weighting.

April 2026 prices: RSP $200.17, EEM $62.67. Year-to-date 2026 EEM is +5 percent versus RSP at +6 percent (similar). Over 24 months EEM returned approximately +18 percent versus RSP at +18 percent (essentially identical). The 2024 to 2026 RSP-EEM tracking has been notably tight, suggesting both ETFs are responding to similar global liquidity and risk-appetite cycles. Long-term, EEM has underperformed RSP substantially: 2010 to 2024 saw EEM return approximately +60 percent versus RSP at +400 percent. The current 2024 to 2026 tight tracking is the first multi-year period where EEM has not lagged dramatically. Forward signal: if EEM outperforms RSP sustainedly, the global flight from US assets is underway and dollar-weakness regime is structural.

The 2024 to 2026 period has marked a clear reversal from the 2014 to 2023 era of mega-cap-tech dominance. Through Q1 2026, RSP has outperformed SPY by approximately 5 percentage points YTD. The drivers: (1) Magnificent Seven earnings growth has decelerated from 50+ percent year-over-year (peak 2023) to 15 to 20 percent year-over-year; (2) capex requirements for AI infrastructure have compressed Mag-7 free-cash-flow margins materially; (3) industrials, financials, and energy (the median S&P 500 sectors that RSP overweights vs SPY) have delivered earnings strength; (4) relative valuation has tightened (Mag-7 forward P/E approximately 31x vs RSP ex-Mag-7 forward P/E approximately 19x).

The 5 percentage point YTD gap is meaningful but not yet definitive. For comparison, the 2000 to 2007 mega-cap-fatigue cycle saw RSP outperform SPY by approximately 80 percentage points cumulative across 7 years. The 2026 reversal is in its early stages; sustained RSP-over-SPY outperformance through end of year would mark the most decisive break with the prior decade since the 2000 to 2007 episode.

From 2014 through 2024, RSP underperformed SPY by approximately 80 percentage points cumulative. The cause: mega-cap-tech concentration driving SPY returns disproportionately. Over the decade, the top 10 SPY names (FAANG plus Microsoft and a few others) returned approximately +700 percent on average versus the median S&P 500 stock at approximately +180 percent. SPY captured the mega-cap-tech rally because of cap-weighting; RSP did not because of equal-weighting.

The lost decade for RSP was not unique to RSP itself. All equal-weight, value-tilted, and ex-tech equity strategies underperformed SPY over 2014 to 2024. The persistence of mega-cap-tech leadership turned what had historically been a mean-reverting concentration cycle into a sustained 14-year secular trend. The structural argument for equal-weight (avoid concentration risk) became, in practice, an argument for accepting persistent underperformance until concentration finally peaked. Whether 2024 marked the peak is the central question for forward RSP allocations.

RSP launched in April 2003. Through end-2024, compounded annualized return of RSP was approximately 11.0 percent versus SPY at 10.5 percent. The 50 basis point annual outperformance reflects the long-term equal-weight benefit: the rebalance mechanic systematically harvests mean-reversion across 500 stocks.

The path to that 50 basis point edge was extremely path-dependent. RSP outperformed SPY substantially from 2003 to 2007 (approximately 80 percentage points cumulative). RSP slightly outperformed during 2008 to 2014. RSP dramatically underperformed during 2014 to 2024 (approximately 80 percentage points cumulative underperformance). The 22-year compounded edge of 50 basis points hides extreme regime variation. For long-term investors with 20+ year horizons, RSP probably delivers similar or modestly better risk-adjusted returns than SPY because of the rebalance benefit, but the path can include 5 to 10 year periods of meaningful underperformance during concentration cycles. Investors with shorter horizons (5 to 10 years) face material regime risk: a wrong call on mega-cap-tech concentration can produce 30 to 50 percentage points of relative drag.

RSP rebalances back to equal-weight (each name approximately 0.2 percent) every calendar quarter. The mechanical rebalance has two consequences: (1) it sells stocks that have outperformed (above 0.2 percent weight after intra-quarter movement) and buys stocks that have underperformed; (2) it generates approximately 25 to 35 percent annual portfolio turnover, considerably higher than SPY at approximately 3 percent annual turnover.

The rebalance is the source of RSP's long-term mean-reversion benefit but also the source of its higher trading costs. RSP's 0.20 percent expense ratio is moderately higher than SPY's 0.0945 percent (or VOO at 0.03 percent), and the embedded transaction costs from rebalancing add another 5 to 10 basis points of drag annually. The net long-term advantage of RSP over SPY of approximately 50 basis points compounded reflects the rebalance benefit minus the cost drag. The rebalance also means that during sharp single-name moves (e.g., NVDA running 200 percent in 2024), RSP automatically trims the winner before the move is complete, capping upside relative to a fund that lets winners run.

Three rules for using RSP versus its various counterparties.

First, hold RSP rather than SPY when concentration is at extremes. The 39 percent top-10 weight in SPY (February 2026 reading) is comparable to 1999 to 2000 levels. Concentration extremes have historically produced 5 to 10 year RSP outperformance cycles. Current setup probabilistically favors RSP.

Second, hold RSP versus QQQ when AI-cycle euphoria is moderating. QQQ's 40 percent Mag-7 weight makes it the highest-concentration major equity exposure available. When Mag-7 forward P/E exceeds 30x (current 31x), historical mean-reversion suggests RSP outperformance over the subsequent 24 months. The bet is on AI-cycle moderation, not on AI-cycle reversal.

Third, pair RSP with IWM for broadest US equity exposure. The combined RSP-IWM (50/50 allocation) captures 700 effective names across cap-weight and equal-weight large/small dimensions, with substantially lower single-name risk than SPY. This is the most diversified single-decision US equity allocation available. The tradeoff is accepting modest underperformance during mega-cap-tech-led rallies in exchange for substantial outperformance during broad-participation rallies.