ETF comparison
IWB vs SPYM
Both US Large Cap.
iShares Russell 1000 ETF · State Street SPDR Portfolio S&P 500 ETF
Holdings overlap
500 positions appear in both funds. Buying equal dollars of IWB and SPYM would leave roughly 91.7% 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 13 bps cheaper than IWB. On a $100,000 position that's about $130/yr more in fees for IWB.
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 IWB vs SPYM.
Top shared holdings
500 shared in total| # | Holding | In IWB | In SPYM | Overlap |
|---|---|---|---|---|
| 1 | NVIDIA CORPORATION | 6.72% | 7.51% | 6.72% |
| 2 | APPLE INC. | 6.03% | 6.59% | 6.03% |
| 3 | MICROSOFT CORPORATION | 3.99% | 4.29% | 3.99% |
| 4 | AMAZON.COM, INC. | 3.33% | 3.62% | 3.33% |
| 5 | ALPHABET INC. | 3.00% | 3.25% | 3.00% |
| 6 | BROADCOM INC. | 2.53% | 2.77% | 2.53% |
| 7 | ALPHABET INC. | 2.42% | 2.59% | 2.42% |
| 8 | MICRON TECHNOLOGY, INC. | 1.87% | 2.02% | 1.87% |
| 9 | META PLATFORMS, INC. | 1.78% | 1.92% | 1.78% |
| 10 | TESLA, INC. | 1.77% | 1.83% | 1.77% |
| 11 | ELI LILLY AND COMPANY | 1.38% | 1.47% | 1.38% |
| 12 | ADVANCED MICRO DEVICES, INC. | 1.36% | 1.47% | 1.36% |
Only in IWB
524 total- SPACE EXPLORATION TECHNOLOGIES CORP. 0.13%
- SNOWFLAKE INC. 0.12%
- BLOOM ENERGY CORPORATION 0.12%
- CLOUDFLARE, INC. 0.11%
- Astera Labs, Inc 0.11%
- SPOTIFY TECHNOLOGY S.A. 0.10%
- ROCKET LAB CORPORATION 0.08%
- CHENIERE ENERGY, INC. 0.07%
- Nu Holdings Ltd. 0.07%
- FERGUSON ENTERPRISES INC. 0.07%
Only in SPYM
6 total- Seagate Technology Holdings PLC 0.34%
- NXP Semiconductors NV 0.11%
- TE Connectivity PLC 0.09%
- Erie Indemnity Co 0.01%
- Paramount Skydance Corp 0.00%
- CONTRA WALGREENS BOOTS 0.00%
Related comparisons
More comparisons with IWB
More comparisons with SPYM
- SPYM vs VONE · Vanguard Russell 1000 Index Fund ETF Shares 90.6%
- SPYM vs SCHK · Schwab 1000 ETF 90.5%
- SPYM vs SPY · State Street SPDR S&P 500 ETF Trust 89.7%
- 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%
Percentages are holdings overlap with the named fund.
Open IWB 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.