ETF comparison
SPY vs SPYM
Both US Large Cap.
State Street SPDR S&P 500 ETF Trust · State Street SPDR Portfolio S&P 500 ETF
Holdings overlap
468 positions appear in both funds. Buying equal dollars of SPY and SPYM would leave roughly 89.7% of each dollar exposed to the same underlying securities.
Unmatched is the part of a fund's weight the other fund doesn't match: names only it holds, plus any extra weight it puts in names both funds hold.
Side by side
Sub-score comparison
Tracking quality isn't part of the composite — see what we don't score for why.
Cost difference
SPYM is 7 bps cheaper than SPY. On a $100,000 position that's about $74/yr more in fees for SPY.
Fee figure is the annual expense charged on $100,000. To see how the gap compounds over a multi-decade holding period, open the cost calculator pre-filled with SPY vs SPYM.
Top shared holdings
468 shared in total| # | Holding | In SPY | In SPYM | Overlap |
|---|---|---|---|---|
| 1 | NVIDIA CORP | 8.50% | 7.51% | 7.51% |
| 2 | APPLE INC | 7.32% | 6.59% | 6.59% |
| 3 | MICROSOFT CORP | 5.77% | 4.29% | 4.29% |
| 4 | AMAZON.COM INC | 3.71% | 3.62% | 3.62% |
| 5 | ALPHABET INC CL A | 3.03% | 3.25% | 3.03% |
| 6 | BROADCOM INC | 2.54% | 2.77% | 2.54% |
| 7 | ALPHABET INC CL C | 2.43% | 2.59% | 2.43% |
| 8 | META PLATFORMS INC CLASS A | 2.41% | 1.92% | 1.92% |
| 9 | MICRON TECHNOLOGY INC | 1.82% | 2.02% | 1.82% |
| 10 | TESLA INC | 1.57% | 1.83% | 1.57% |
| 11 | ADVANCED MICRO DEVICES | 1.55% | 1.47% | 1.47% |
| 12 | BERKSHIRE HATHAWAY INC CL B | 1.41% | 1.42% | 1.41% |
Only in SPY
37 total- EXXONMOBIL HOLDINGS CORP 1.01%
- LINDE PLC 0.33%
- SEAGATE TECHNOLOGY HOLDINGS 0.29%
- EATON CORP PLC 0.25%
- ACCENTURE PLC CL A 0.18%
- CHUBB LTD 0.17%
- MEDTRONIC PLC 0.17%
- TRANE TECHNOLOGIES PLC 0.15%
- JOHNSON CONTROLS INTERNATION 0.14%
- BLOOM ENERGY CORP A 0.13%
Only in SPYM
38 total- Exxon Mobil Corp 0.88%
- Linde PLC 0.37%
- Seagate Technology Holdings PLC 0.34%
- Eaton Corp PLC 0.26%
- Chubb Ltd 0.19%
- Trane Technologies PLC 0.17%
- Medtronic PLC 0.16%
- Johnson Controls International plc 0.14%
- Royal Caribbean Cruises Ltd 0.12%
- Accenture PLC 0.12%
Related comparisons
More comparisons with SPY
More comparisons with SPYM
- SPYM vs ITOT · iShares Core S&P Total U.S. Stock Market ETF 88.1%
- SPYM vs VTI · Vanguard Morningstar Total Stock Market ETF 88.1%
- SPYM vs SCHB · Schwab U.S. Broad Market ETF 87.8%
- SPYM vs IWV · iShares Russell 3000 ETF 87.8%
- SPYM vs DFUS · Dimensional U.S. Equity Market ETF 87.8%
- SPYM vs VTHR · Vanguard Russell 3000 Index Fund ETF Shares 87.2%
Percentages are holdings overlap with the named fund.
Open SPY or SPYM at a brokerage
Both funds trade commission-free at major US brokerages.
Affiliate links — opening an account through these earns PlainIndex a one-time referral. Scoring is computed before any affiliate consideration; see our methodology and funding disclosure.
Holdings overlap is the sum of min(weight_a, weight_b) over positions
matched on ISIN (CUSIP fallback). Methodology: see
/methodology/.
Comparing two funds doesn't endorse swapping one for the other. Tax-lot history, account type, and personal goals matter — PlainIndex publishes data and methodology, not investment advice.