ETF comparison
IWP vs SPMD
Both US Mid Cap.
iShares Russell Mid-Cap Growth ETF · State Street SPDR Portfolio S&P 400 Mid Cap ETF
Holdings overlap
98 positions appear in both funds. Buying equal dollars of IWP and SPMD would leave roughly 20.0% 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
SPMD is 20 bps cheaper than IWP. On a $100,000 position that's about $200/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 SPMD.
Top shared holdings
98 shared in total| # | Holding | In IWP | In SPMD | Overlap |
|---|---|---|---|---|
| 1 | Carpenter Technology Corp. | 0.81% | 0.84% | 0.81% |
| 2 | ATI, Inc. | 0.73% | 0.74% | 0.73% |
| 3 | MasTec, Inc. | 0.71% | 0.71% | 0.71% |
| 4 | Woodward, Inc. | 0.69% | 0.70% | 0.69% |
| 5 | Sterling Infrastructure, Inc. | 0.69% | 0.71% | 0.69% |
| 6 | MACOM Technology Solutions Holdings, Inc. | 0.70% | 0.69% | 0.69% |
| 7 | XPO, Inc. | 0.64% | 0.66% | 0.64% |
| 8 | Everpure, Inc. | 0.58% | 0.68% | 0.58% |
| 9 | Lattice Semiconductor Corp. | 0.57% | 0.58% | 0.57% |
| 10 | Fabrinet | 0.55% | 0.55% | 0.55% |
| 11 | Burlington Stores, Inc. | 0.54% | 0.55% | 0.54% |
| 12 | Roku, Inc. | 0.47% | 0.50% | 0.47% |
Only in IWP
168 total- Datadog, Inc. 2.34%
- Snowflake, Inc. 2.33%
- Cloudflare, Inc. 2.12%
- Teradyne, Inc. 2.07%
- Astera Labs, Inc. 2.02%
- Simon Property Group, Inc. 1.96%
- Comfort Systems USA, Inc. 1.89%
- Robinhood Markets, Inc. 1.75%
- Lumentum Holdings, Inc. 1.67%
- Targa Resources Corp. 1.56%
Only in SPMD
302 total- Illumina Inc 0.73%
- United Therapeutics Corp 0.63%
- Okta Inc 0.63%
- US Foods Holding Corp 0.62%
- RB Global Inc 0.60%
- TD SYNNEX Corp 0.55%
- Reliance Inc 0.53%
- Nextpower Inc 0.49%
- East West Bancorp Inc 0.49%
- ITT Inc 0.49%
Related comparisons
More comparisons with IWP
- IWP vs IJH · iShares Core S&P Mid-Cap ETF 20.0%
- IWP vs IJK · iShares S&P Mid-Cap 400 Growth ETF 19.0%
- IWP vs AVMV · Avantis U.S. Mid Cap Value ETF 18.3%
- IWP vs IVOO · Vanguard S&P Mid-Cap 400 Index Fund ETF Shares 18.1%
- IWP vs MDY · State Street SPDR S&P MIDCAP 400 ETF Trust 17.3%
- IWP vs IWF · iShares Russell 1000 Growth ETF 10.8%
More comparisons with SPMD
- SPMD vs IWM · iShares Russell 2000 ETF 11.2%
- SPMD vs IWD · iShares Russell 1000 Value ETF 6.8%
- SPMD vs ITOT · iShares Core S&P Total U.S. Stock Market ETF 5.0%
- SPMD vs VTI · Vanguard Morningstar Total Stock Market ETF 5.0%
- SPMD vs SCHB · Schwab U.S. Broad Market ETF 4.8%
- SPMD vs VYM · Vanguard High Dividend Yield Index Fund ETF Shares 4.5%
Percentages are holdings overlap with the named fund.
Open IWP or SPMD 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.