Compare & Overlap
SPY vs SPYM
Two funds can look different and hold the same stocks. We line them up on cost and composition, then compute how much of their holdings by weight the two share.
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Head-to-head
THE VERDICT
SPY and SPYM share 99% of their holdings by weight, near-identical baskets. Their expense ratios are 0.09% and 0.02%. SPYM is the cheaper of the two.
Holdings overlap · Σ min(weight in SPY, weight in SPYM)
Portfolio overlap
99%overlap
Shared holdings503
Total unique names503
In one, not the other0
Top shared holdings · weight in SPY / SPYM
Which 503 names both funds hold, at what weight, and which positions each fund weights more heavily, is on a paid plan.Premium · $119/yr · 7-day trial · cancel anytimeUnlock the shared names →
Heavier in SPY · Heavier in SPYM
Where each fund leans is withheld with the shared names above, on the same plan.
Portfolio look-through · “am I secretly all-in on one stock?”
Your holdings:
Overlap computed Oct 20, 2026 from each fund's published holdings via the weighted-minimum method. Bond and fund-of-funds holdings are excluded from look-through where disaggregation is unreliable. Decision-support, not a recommendation · Not investment advice.