SPYM's cap-weighted structure delivered +323% over 10 years versus RSP's +203%, as mega-cap tech giants automatically captured more capital with every gain. Apple alone holds 6.59% of SPYM's $154 billion in assets, making it a concentrated mega-cap bet disguised as broad market diversification. RSP weights all 500 stocks equally and tilts toward industrials and financials, only outperforming SPYM when mega-cap tech leadership durably fades.
Two retirees, same $1 million, same 4% rule, buy one finished with $1.4 million, the other hit $0 in 12 years. Our free reader guide explains the flaw that separated them, and the income-first method built to avoid it. Two funds hold nearly identical rosters of large American companies drawn from the same S&P benchmark.
The only meaningful difference between SPDR Portfolio S&P 500 ETF (NYSEARCA:SPYM) and Invesco S&P 500 Equal Weight ETF (NYSEARCA:RSP) is how much of each name they own. That single choice has produced a decade of divergent returns, and the very reason SPYM won is why its owners should look closely at what they hold. SPYM last traded at $91.12, and RSP at $212.70, both delayed intraday marks pulled on Wednesday morning.
Both funds have a full decade of price history on record, so every window below is a clean, like-for-like comparison. SPYM leads across every window, and the separation widens over longer horizons. The one-month column shows the gap still opening in real time.
SPYM weights each S&P 500 constituent by market capitalization, so the biggest companies drive the bulk of returns. The N-PORT filing dated June 30, 2026, shows Apple alone at 6.59% of net assets, worth roughly $10.1 billion inside a fund carrying $153.9 billion in total net assets. Amazon added 3.62%, Alphabet's two share classes combined for more, and Broadcom at 2.77%.
Every retiree knows about the 4% rule, but it frames retirement as a slow liquidation and still causes retirees with seven-figure accounts to agonize over a dinner out. There's a different way to run the math that makes more sense today. Build an income floor — dividends, interest, and Social Security that cover your essential bills every month — and you never have to sell shares into a down market just to pay them.
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