ETF comparison
IWP vs SPYM
US Mid Cap vs US Large Cap.
iShares Russell Mid-Cap Growth ETF · State Street SPDR Portfolio S&P 500 ETF
Holdings overlap
82 positions appear in both funds. Buying equal dollars of IWP and SPYM would leave roughly 4.6% 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 21 bps cheaper than IWP. On a $100,000 position that's about $210/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 SPYM.
Top shared holdings
82 shared in total| # | Holding | In IWP | In SPYM | Overlap |
|---|---|---|---|---|
| 1 | Datadog, Inc. | 2.34% | 0.13% | 0.13% |
| 2 | Robinhood Markets, Inc. | 1.75% | 0.12% | 0.12% |
| 3 | Royal Caribbean Cruises Ltd. | 1.24% | 0.12% | 0.12% |
| 4 | Coherent Corp. | 0.40% | 0.12% | 0.12% |
| 5 | Teradyne, Inc. | 2.07% | 0.12% | 0.12% |
| 6 | Marathon Petroleum Corp. | 1.05% | 0.12% | 0.12% |
| 7 | Simon Property Group, Inc. | 1.96% | 0.11% | 0.11% |
| 8 | United Rentals, Inc. | 0.45% | 0.11% | 0.11% |
| 9 | Comfort Systems USA, Inc. | 1.89% | 0.11% | 0.11% |
| 10 | Phillips 66 | 0.11% | 0.11% | 0.11% |
| 11 | Lumentum Holdings, Inc. | 1.67% | 0.10% | 0.10% |
| 12 | Delta Air Lines, Inc. | 0.10% | 0.09% | 0.09% |
Only in IWP
184 total- Snowflake, Inc. 2.33%
- Cloudflare, Inc. 2.12%
- Astera Labs, Inc. 2.02%
- Rocket Lab Corp. 1.49%
- 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%
- CoreWeave, Inc. 0.95%
Only in SPYM
424 total- NVIDIA Corp 7.51%
- Apple Inc 6.59%
- Microsoft Corp 4.29%
- Amazon.com Inc 3.62%
- Alphabet Inc 3.25%
- Broadcom Inc 2.77%
- Alphabet Inc 2.59%
- Micron Technology Inc 2.02%
- Meta Platforms Inc 1.92%
- Tesla Inc 1.83%
Related comparisons
More comparisons with IWP
- IWP vs IVV · iShares Core S&P 500 ETF 4.6%
- IWP vs VTV · Vanguard Morningstar Value ETF 4.4%
- IWP vs SPY · State Street SPDR S&P 500 ETF Trust 4.4%
- 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%
More comparisons with SPYM
- SPYM vs AVMV · Avantis U.S. Mid Cap Value ETF 4.5%
- SPYM vs VB · Vanguard Morningstar Small-Cap ETF 3.2%
- SPYM vs SCHM · Schwab U.S. Mid-Cap ETF 2.7%
- SPYM vs VBR · Vanguard Morningstar Small-Cap Value ETF 2.7%
- SPYM vs PEY · Invesco High Yield Equity Dividend Achievers ETF 2.3%
- SPYM vs FNDA · Schwab Fundamental U.S. Small Company ETF 2.2%
Percentages are holdings overlap with the named fund.
Open IWP 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.