# Magnificent 7 make up 32% of S&P 500 cap‑weighted ETF as of March 2026

**Published:** 2026-06-18T13:07:29.552Z  
**Topic:** S P 500  
**Sentiment:** neutral  
**Publisher:** TrendWatcher — https://www.trendwatcher.in/article/dbf5e6d6-9079-47df-a582-caca81454a5a

Magnificent 7 account for roughly 32% of SPY’s market‑cap weight, dwarfing the 1.4% in an equal‑weight S&P 500 fund. See why this matters for investors.

The Magnificent 7 – Nvidia, Apple, Microsoft, Alphabet, Amazon, Meta and Tesla – represent about 32% of the SPDR S&P 500 ETF (SPY) portfolio as of March 31 2026, versus only 1.4% in the Invesco S&P 500 Equal Weight ETF (RSP)【1】. That concentration drives a stark divergence in performance and risk profile between the two flagship S&P 500 funds.

| At a glance | |
|---|---|
| Magnificent 7 weight in SPY | 32% |
| Magnificent 7 weight in RSP | 1.4% |
| YTD return (2026) – SPY | +8.38% |
| YTD return (2026) – RSP | +9.67% |
| Recent 1‑month performance – SPY | –0.08% |
| Recent 1‑month performance – RSP | +2.49% |

## Concentration vs. diversification

SPY’s cap‑weighting gives the biggest winners an ever‑larger slice of each new dollar, making the fund a “momentum vehicle” that is heavily tilted toward AI‑related mega‑caps. The 32% exposure to the Magnificent 7 is the single biggest driver of its outperformance when those stocks rally. Over the five‑year window ending June 9 2026, SPY returned 73.99% versus RSP’s 49.59%, and over ten years the gap widens to 250.86% versus 207.45%【1】. By contrast, RSP’s equal‑weight rule caps each constituent at roughly 0.20%, limiting the seven mega‑caps to just 1.4% of the portfolio and giving the fund a structural mid‑cap tilt.

## Recent shift in performance

The early 2026 market rotation has narrowed the gap. RSP is up 9.67% year‑to‑date, outpacing SPY’s 8.38% gain, and the past month saw RSP climb 2.49% while SPY was essentially flat【1】. In the last week, SPY fell 2.96% versus a modest 0.4% dip for RSP, illustrating how equal weighting can quickly reassert itself when mega‑caps lose steam. The divergence reflects the funds’ differing bets: SPY leans on continued mega‑cap dominance; RSP benefits from broader market breadth and value rotation.

## Cost and risk considerations

Both ETFs have low expense ratios, with RSP’s fee only about 10 basis points higher than SPY’s【1】. However, RSP’s quarterly rebalancing generates higher turnover, potentially reducing tax efficiency in taxable accounts. The key trade‑off is concentration risk versus sector diversification: SPY’s heavy exposure to the Magnificent 7 raises single‑stock risk, while RSP’s equal‑weight design spreads risk across the entire S&P 500, lowering exposure to any one company.

## What to watch
- **Quarterly rebalance dates** for RSP (typically the end of March, June, September and December) – shifts in weight can amplify performance differentials.  
- **Earnings releases of the Magnificent 7** – strong results could widen SPY’s lead; weak guidance may accelerate RSP’s outperformance.  
- **Broad market breadth indicators** (e.g., advance‑decline line) – a narrowing breadth could favor the equal‑weight approach.

The stark contrast between a 32% mega‑cap concentration and a 1.4% exposure underscores a fundamental choice for investors: bet on the continued dominance of the Magnificent 7, or hedge that bet with a more diversified, equal‑weight S&P 500 exposure. The answer hinges on whether the AI‑driven rally sustains or market breadth returns.

## Sources
1. 24/7 Wall St. — [RSP vs. SPY: Does Equal Weight Beat the Cap-Weighted S&P 500?](https://247wallst.com/investing/2026/06/10/rsp-vs-spy-does-equal-weight-beat-the-cap-weighted-sp-500/)
2. 247wallst.com — [1 Unstoppable Vanguard ETF to Buy and Hold for the Next Decade](https://247wallst.com/investing/2026/06/15/1-unstoppable-vanguard-etf-to-buy-and-hold-for-the-next-decade/)
3. Investing.com — [US Market Call: Roaring 2020s Rockets to Mars and Beyond | Investing.com](https://www.investing.com/analysis/us-market-call-roaring-2020s-rockets-to-mars-and-beyond-200682103)

---
Cite as: TrendWatcher, "Magnificent 7 make up 32% of S&P 500 cap‑weighted ETF as of March 2026", https://www.trendwatcher.in/article/dbf5e6d6-9079-47df-a582-caca81454a5a