IWP vs MID
iShares Russell Midcap Growth ETF vs American Century Mid Cap Growth Impact ETF
Which is better, IWP or MID?
MID has been ahead.
IWP has a lower expense ratio. MID led over 1Y and the full window. The two have moved almost in lockstep, correlation 0.93. IWP is less concentrated, with 22.2% of the fund in its ten largest positions against 52.3%.
MarketXLS is not an investment adviser. This comparison is generated automatically from market data and is for information only. A Best mark means the better reading on that one measure, not a recommendation to buy.
Side-by-Side Comparison
| Metric | IWP | MID |
|---|---|---|
| Expense Ratio | 0.23%Best | 0.39% |
| AUM | $18.5B | $104M |
| Dividend Yield | 0.39% | 0.14% |
| Holdings | 551 | 35 |
| Volatility (annualized) | 19.2%Best | 20.3% |
| Max Drawdown | -38.6%Best | -40.1% |
| $10,000 over 6.2 years | $17,874 | $18,302Best |
| Top 10 Weight | 22.2%Best | 52.3% |
| Fund Family | iShares by BlackRock (US) | American Century Investments |
| Category | Equity | Equity |
| Style | Mid Cap Growth | Mid Cap Growth |
| Inception | Jul 17, 2001 | Jul 15, 2020 |
Not shown on this pair: YTD Return, 1Y Return, 3Y Return (annualized), 5Y Return (annualized).
The two price series end 31 days apart, so a return over any period would be measuring two different stretches of market. Those rows are withheld. IWP has data through Nov 9, 2026 and MID through Oct 9, 2026.
Volatility and max drawdown, and the $10,000 over 6.2 years row, are measured over the window both funds cover: Jul 15, 2020 to Oct 9, 2026 (6.2 years).
Risk: Volatility and Drawdowns
MID has been the more volatile fund, with annualized monthly volatility of 20.3% compared with 19.2% for IWP. Lower volatility generally means a smoother ride, though it often comes with lower long-run returns.
The deepest peak-to-trough decline in our data was -38.6% for IWP and -40.1% for MID. Drawdown depth is what each fund did in the worst stretch of the window measured above.
The two funds' monthly returns correlate at 0.93. They move almost in lockstep, so holding both mostly duplicates the same exposure.
Fees and Cost Over Time
IWP charges 0.23% per year while MID charges 0.39%. On a $10,000 position that is $23 vs $39 annually, a gap of $16 per year that compounds over a long holding period. On income, IWP currently yields 0.39% against 0.14% for MID.
Holdings Overlap
16.4% of IWP's money is in holdings MID also owns. 46.9% of MID's money is in holdings IWP also owns.
The two portfolios partly overlap.
17 positions in common, counted across the 271 positions we hold weights for in IWP and 34 in MID, against full books of 551 and 35.
What only one of them owns
Our book lists 14 positions for MID that do not appear in our book for IWP (46.3% of the fund), and 236 for IWP that do not appear in MID (79.9%).
Some of those will be the same company recorded under a different code in one of the two books, so the real difference in what you would own is no larger than this and may be smaller. We do not name the individual positions here for that reason.
Top Shared Holdings
| Stock | Weight in IWP | Weight in MID | Difference |
|---|---|---|---|
| NETCloudflare Inc (180 Day Lockup) | 3.05% | 7.80% | 4.75% |
| TRGPTarga Resources Corp Preferred | 1.82% | 4.68% | 2.86% |
| CMGChipotle Mexican Grill Inc. Class A | 1.13% | 4.58% | 3.45% |
| MTSIMacom Technology Solutions Holdings, Inc. | 0.58% | 4.78% | 4.20% |
| VSTVistra Energy Corp. | 1.50% | 3.17% | 1.67% |
| ALNYAlnylam Pharmaceuticals Inc. | 0.88% | 3.14% | 2.26% |
| NTRANatera Inc | 1.58% | 2.06% | 0.48% |
| CPNGCoupang LLC | 0.53% | 3.09% | 2.56% |
| IDXXIdexx Laboratories Inc. | 1.03% | 2.24% | 1.21% |
| RDDTReddit Inc Series C Pc Pp | 0.60% | 2.62% | 2.02% |
46.9% of MID is already inside IWP.
You probably hold more than these two. Add the rest and see how much of the whole book is the same companies twice.
Free for up to 10 holdings. No account needed.
Frequently Asked Questions
Which is cheaper, IWP or MID?
IWP has an expense ratio of 0.23% while MID charges 0.39%. IWP is the cheaper option, by $16 a year on a $10,000 investment.
Which is riskier, IWP or MID?
MID has been the more volatile fund at 20.3% annualized versus 19.2% for IWP. Worst drawdown: IWP -38.6% vs MID -40.1%.
Should I hold both IWP and MID?
IWP and MID have a monthly-return correlation of 0.93, so they move almost identically. What is left to separate them is the fee and the index each one tracks. This is information, not a recommendation.
What is the holdings overlap between IWP and MID?
46.9% of MID's money is in holdings IWP also owns. 46.9% of MID's is in holdings IWP also owns. They hold 17 positions in common, counted across the 271 positions we hold weights for in IWP and 34 in MID.
Which pays a higher dividend, IWP or MID?
IWP yields 0.39% while MID yields 0.14%, so IWP currently pays the higher dividend yield.
Is MID better than IWP?
IWP has a lower expense ratio. MID led over 1Y and the full window. The two have moved almost in lockstep, correlation 0.93. IWP is less concentrated, with 22.2% of the fund in its ten largest positions against 52.3%. Which one suits a particular account depends on what it is for. This is information, not a recommendation.