ETF comparison
IWP vs SPY
US Mid Cap vs US Large Cap.
iShares Russell Mid-Cap Growth ETF · State Street SPDR S&P 500 ETF Trust
Holdings overlap
83 positions appear in both funds. Buying equal dollars of IWP and SPY would leave roughly 4.4% 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
SPY is 14 bps cheaper than IWP. On a $100,000 position that's about $136/yr more in fees for IWP.
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 IWP vs SPY.
Top shared holdings
83 shared in total| # | Holding | In IWP | In SPY | Overlap |
|---|---|---|---|---|
| 1 | Marathon Petroleum Corp. | 1.05% | 0.17% | 0.17% |
| 2 | Phillips 66 | 0.11% | 0.16% | 0.11% |
| 3 | Simon Property Group, Inc. | 1.96% | 0.11% | 0.11% |
| 4 | United Rentals, Inc. | 0.45% | 0.11% | 0.11% |
| 5 | Robinhood Markets, Inc. | 1.75% | 0.10% | 0.10% |
| 6 | Cencora, Inc. | 1.45% | 0.10% | 0.10% |
| 7 | Kimberly-Clark Corp. | 0.32% | 0.10% | 0.10% |
| 8 | WW Grainger, Inc. | 1.39% | 0.10% | 0.10% |
| 9 | Datadog, Inc. | 2.34% | 0.10% | 0.10% |
| 10 | Targa Resources Corp. | 1.56% | 0.09% | 0.09% |
| 11 | Fastenal Co. | 1.23% | 0.09% | 0.09% |
| 12 | Cardinal Health, Inc. | 0.70% | 0.09% | 0.09% |
Only in IWP
183 total- Snowflake, Inc. 2.33%
- Cloudflare, Inc. 2.12%
- Astera Labs, Inc. 2.02%
- Rocket Lab Corp. 1.49%
- Royal Caribbean Cruises Ltd. 1.24%
- Credo Technology Group Holding Ltd. 1.23%
- Alnylam Pharmaceuticals, Inc. 1.10%
- Natera, Inc. 1.01%
- Anglogold Ashanti plc 1.01%
- Revolution Medicines, Inc. 0.98%
Only in SPY
421 total- APPLE INC 7.69%
- NVIDIA CORP 7.30%
- MICROSOFT CORP 6.22%
- AMAZON.COM INC 3.94%
- ALPHABET INC CL A 2.56%
- BROADCOM INC 2.33%
- META PLATFORMS INC CLASS A 2.09%
- ALPHABET INC CL C 2.06%
- ELI LILLY + CO 1.71%
- TESLA INC 1.64%
Related comparisons
More comparisons with IWP
- IWP vs QQQ · Invesco QQQ Trust 3.7%
- IWP vs DGRO · iShares Core Dividend Growth ETF 3.7%
- IWP vs VIG · Vanguard Dividend Appreciation Index Fund ETF Shares 3.2%
- IWP vs SCHD · Schwab U.S. Dividend Equity ETF 3.0%
- IWP vs IJR · iShares Core S&P Small-Cap ETF 1.3%
- IWP vs IWM · iShares Russell 2000 ETF 0.0%
More comparisons with SPY
- SPY vs VB · Vanguard Morningstar Small-Cap ETF 3.4%
- SPY vs VBR · Vanguard Morningstar Small-Cap Value ETF 2.7%
- SPY vs PEY · Invesco High Yield Equity Dividend Achievers ETF 2.7%
- SPY vs SCHM · Schwab U.S. Mid-Cap ETF 2.4%
- SPY vs FNDA · Schwab Fundamental U.S. Small Company ETF 2.2%
- SPY vs BBMC · JPMorgan BetaBuilders U.S. Mid Cap Equity ETF 1.6%
Percentages are holdings overlap with the named fund.
Open IWP or SPY 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.