ETF comparison
IWF vs MDY
US Large Cap Growth vs US Mid Cap.
iShares Russell 1000 Growth ETF · State Street SPDR S&P MIDCAP 400 ETF Trust
Holdings overlap
101 positions appear in both funds. Buying equal dollars of IWF and MDY would leave roughly 2.2% 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
IWF is 5 bps cheaper than MDY. On a $100,000 position that's about $50/yr more in fees for MDY.
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 IWF vs MDY.
Top shared holdings
101 shared in total| # | Holding | In IWF | In MDY | Overlap |
|---|---|---|---|---|
| 1 | CARPENTER TECHNOLOGY CORPORATION | 0.09% | 0.41% | 0.09% |
| 2 | ATI INC | 0.08% | 0.70% | 0.08% |
| 3 | MASTEC, INC. | 0.08% | 0.30% | 0.08% |
| 4 | MACOM TECHNOLOGY SOLUTIONS HOLDINGS, INC. | 0.08% | 0.46% | 0.08% |
| 5 | WOODWARD, INC. | 0.07% | 0.55% | 0.07% |
| 6 | STERLING INFRASTRUCTURE, INC. | 0.07% | 0.25% | 0.07% |
| 7 | XPO, INC. | 0.07% | 0.63% | 0.07% |
| 8 | LATTICE SEMICONDUCTOR CORPORATION | 0.06% | 0.44% | 0.06% |
| 9 | FABRINET | 0.06% | 0.35% | 0.06% |
| 10 | BURLINGTON STORES, INC. | 0.06% | 0.47% | 0.06% |
| 11 | ROKU, INC. | 0.05% | 0.62% | 0.05% |
| 12 | BWX TECHNOLOGIES, INC. | 0.05% | 0.32% | 0.05% |
Only in IWF
267 total- NVIDIA CORPORATION 13.83%
- APPLE INC. 6.72%
- ALPHABET INC. 6.17%
- BROADCOM INC. 5.21%
- ALPHABET INC. 4.98%
- MICROSOFT CORPORATION 4.11%
- MICRON TECHNOLOGY, INC. 3.86%
- TESLA, INC. 3.64%
- META PLATFORMS, INC. 3.00%
- ELI LILLY AND COMPANY 2.84%
Only in MDY
300 total- U.S. Dollar 0.77%
- United Therapeutics Corporation 0.75%
- US Foods Holding Corp. 0.68%
- Tenet Healthcare Corporation 0.67%
- Reliance Inc. 0.65%
- Royal Gold Inc. 0.60%
- Roivant Sciences Ltd. 0.59%
- TD SYNNEX Corporation 0.53%
- East West Bancorp Inc. 0.53%
- ITT Inc. 0.51%
Related comparisons
More comparisons with IWF
- IWF vs IVOO · Vanguard S&P Mid-Cap 400 Index Fund ETF Shares 2.2%
- IWF vs IJH · iShares Core S&P Mid-Cap ETF 2.2%
- IWF vs SPMD · State Street SPDR Portfolio S&P 400 Mid Cap ETF 2.2%
- IWF vs IJK · iShares S&P Mid-Cap 400 Growth ETF 2.1%
- IWF vs VOE · Vanguard Morningstar Mid-Cap Value ETF 1.4%
- IWF vs DFAS · DFA U.S. Small Cap Portfolio-ETF Class Shares 1.4%
More comparisons with MDY
- MDY vs IJR · iShares Core S&P Small-Cap ETF 2.0%
- MDY vs VO · Vanguard Morningstar Mid-Cap ETF 0.3%
- MDY vs VOT · Vanguard Morningstar Mid-Cap Growth ETF 0.2%
- MDY vs VTV · Vanguard Morningstar Value ETF 0.2%
- MDY vs SPYM · State Street SPDR Portfolio S&P 500 ETF 0.1%
- MDY vs VOO · Vanguard S&P 500 ETF 0.1%
Percentages are holdings overlap with the named fund.
Open IWF or MDY 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.