At a glance
MID charges 0.45% a year, above the 0.16% average of the 7 funds most like it (the most expensive of 8). It has $72.8M in assets, the 8th largest of that group; it paid 0.12% of its price in distributions over the past 12 months, semiannual. Over the past year it returned +0.6% with distributions reinvested (S&P 500: +11.5%), 7th of those 8 funds; over three years it returned +19.5% a year. At its worst it fell 33.9% in the 2022 bear market (S&P 500: 24.5%), and was back at its earlier high 21 months after the low.
The short version
American Century Mid Cap Growth Impact (MID) is a stock ETF from American Century Investments. Its name points to mid-size growth companies chosen with an "impact" lens. Its expense ratio is 0.45%, the highest among the seven similar mid-cap funds we compared, whose average was 0.16%. It is also small, with about $72.8 million in net assets, and it has been more volatile than the broad market.
Price history
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MID +0.6% over the year to Oct 27, 2026, total return with distributions reinvested.
How it has behaved
| YTD | 1 yr | 3 yr | 5 yr | 10 yr | Since start | |
|---|---|---|---|---|---|---|
| MID price data to Oct 27, 2026 | +6.6% | +0.6% | +19.5% | +2.8% | — | +4.4% |
- Over the year to Oct 27, 2026, MID returned +0.6%, 7th of 8 among similar funds.
- Its 5-year annualized return was +2.8%.
- Its worst full calendar year was 2022 (-27.4%); its best was 2023 (+22.2%).
- The deepest fall in its price history was 40.2% (Nov 16, 2021 to Jun 16, 2022), recovered by Oct 14, 2024.
Show as a table
| Year | Price data |
|---|---|
| 2026 (to date) | +6.5% |
| 2025 | +8.2% |
| 2024 | +19.4% |
| 2023 | +22.2% |
| 2022 | -27.4% |
| 2008 financial crisis stocks fell Oct 9, 2007 – Mar 9, 2009 | Before this security existed |
|---|---|
| 2020 COVID crash stocks fell Feb 19, 2020 – Mar 23, 2020 | Before this security existed |
| 2022 bear market stocks fell Jan 3, 2022 – Oct 12, 2022 | Lost 31.3% over that stretch · deepest drop along the way 33.9%, back to its old high 20.5 months after the low |
Dividends and income
Show as a table
| Year | Per share | Change |
|---|---|---|
| 2026 (to date) | $0.0400 | |
| 2025 | $0.1200 | -3.3% |
| 2024 | $0.1241 | +1141.0% |
| 2023 | $0.0100 |
How it works
We could not find a current SEC prospectus for MID under this ticker. The ticker did not show up in the SEC's ticker files. That can happen when a fund has been renamed, closed or is not SEC-registered. Without the prospectus, we can't confirm how the fund picks its stocks, how it weights them or how often it rebalances. Before investing, it's worth reading the fund's own documents from American Century Investments.
The name tells you the general idea. "Mid cap" means mid-size companies, which sit between large household names and small firms. "Growth" means companies expected to grow sales and earnings faster than average. These often trade at higher prices relative to their earnings and tend to swing more in value. "Impact" funds usually look for companies whose products or services aim to address social or environmental problems. MID's exact rules for this are not in the materials we reviewed.
Mechanically, MID looks like an ordinary stock ETF. Nothing we reviewed points to leverage, inverse exposure, options, buffers or a trust structure. It launched on July 13, 2020. With about $72.8 million in net assets, it is far smaller than its peers. Small ETFs can trade less heavily, and they are more likely to be closed by their sponsor.
What it really costs
- MID charges 0.45% a year, versus an average of 0.16% for the similar funds below (8th of 8, cheapest first).
In a retirement portfolio
MID is a small, higher-cost, more volatile mid-cap growth fund with very little income, so it fits better as a small add-on than as a foundation.
MID's price history starts in February 2021, so of the major downturns it only went through the 2022 bear market, not 2008 or the 2020 crash. In 2022 it lost 27.4%, its worst calendar year. Its deepest drop was about 40%, from November 16, 2021, to June 16, 2022. It took about 28 months, until October 14, 2024, to get back to its earlier high. Anyone who had to sell shares in mid-2022 would have locked in steep losses. It pays almost no income: the trailing yield was 0.12% as of October 27, 2026, paid twice a year. Its 0.45% expense ratio is close to three times the 0.16% average of similar funds. Past results don't predict future ones, and a retirement plan should look at the whole portfolio, not one fund.
Who it may suit — and who should look elsewhere
May suit
- Investors who want mid-size growth companies with an impact theme and accept 0.45% in yearly costs, versus 0.07% for Vanguard Mid-Cap Growth ETF (VOT).
- Long-horizon investors who can ride out drops like its roughly 40% fall from November 2021 to June 2022, which took 28 months to recover.
- Investors looking for a small add-on to a diversified portfolio who aren't counting on income, given its 0.12% trailing yield.
Look elsewhere if
- Cost-focused investors: MID ranked 8th of 8 on cost among the similar mid-cap funds we compared, where the average was 0.16%.
- Retirees who need regular income: the trailing yield was 0.12% as of October 27, 2026, paid only twice a year.
- Investors who want a large, well-documented fund: net assets were about $72.8 million, and we couldn't match the ticker to a current SEC filing.
Close alternatives
Matched by legacy category (no holdings report for this fund).
| Fund | Cost | Net assets | 1 yr | 3 yr |
|---|---|---|---|---|
| MID this fund | 0.45% | $72.8M | +0.6% | +19.5% |
| VO Vanguard Mid-Cap ETF | 0.04% | $175.20B | +15.5% | +20.7% |
| IJH iShares Core S&P Mid-Cap ETF | 0.05% | $89.40B | +15.3% | +16.6% |
| VOT Vanguard Mid-Cap Growth ETF | 0.07% | $27.20B | -0.4% | +17.4% |
| SCHM Schwab US Mid-Cap ETF | 0.04% | $10.70B | +20.5% | +18.9% |
| IJK iShares S&P Mid-Cap 400 Growth ETF | 0.17% | $8.40B | +11.6% | +17.9% |
| JHMM John Hancock Multifactor Mid Cap ETF | 0.42% | $3.90B | +13.2% | +19.7% |
| XMMO Invesco S&P MidCap Momentum ETF | 0.34% | $3.40B | +0.7% | +23.5% |
Questions investors ask
What does the MID ETF invest in?
Going by its name, MID invests in stocks of mid-sized companies whose sales or profits are growing faster than average, with an added "impact" focus. The fund is American Century Mid Cap Growth Impact, from American Century Investments, and it launched on July 13, 2020. A list of its largest holdings was not available for this page. Its ticker also does not appear in SEC ticker listings. That can mean a fund has been renamed or closed, so its status is worth confirming with American Century.
Is MID good for retirement income?
Not as an income source. MID's yield, meaning the income it paid as a share of its price, was 0.12% for the year to October 27, 2026. That came to about $0.08 per share, paid twice a year. MID is built for growth, and its price can swing sharply. It fell 40.2% from November 16, 2021, to June 16, 2022, and took about 28 months to recover. For retirees, it may suit only a small growth slice next to steadier holdings.
What's the difference between MID and VOT?
The biggest gaps are cost and size. Vanguard Mid-Cap Growth ETF (VOT) is the most similar fund by category. It charges 0.07% a year, compared with MID's 0.45%, and has about $27.2 billion in assets, compared with MID's $72.8 million. MID returned slightly more over three years: 19.5% a year as of October 27, 2026, compared with 17.4% a year for VOT as of October 30, 2026. Over one year, MID gained 0.6% while VOT lost 0.4%.
What is MID's expense ratio?
MID's expense ratio is 0.45% a year. That is the share of assets taken each year to run the fund. It is the highest in a group of eight mid-cap funds that includes MID, and the other seven average 0.16%. Vanguard Mid-Cap ETF (VO) and Schwab US Mid-Cap ETF (SCHM) each charge 0.04%, and iShares Core S&P Mid-Cap ETF (IJH) charges 0.05%. Those three are broad mid-cap funds, not growth-focused ones. Over decades, a cost gap this size can noticeably reduce what an investor keeps.
Is MID a risky ETF?
Yes, it has carried more risk than the broad market. MID lost 27.44% in calendar 2022, then gained 22.2% in 2023, 19.44% in 2024 and 8.22% in 2025. Its beta, a measure of how much a fund moves with the market, was 1.17 for the year to October 27, 2026. That means it tended to move about 1.17 times as much as the market. Its size is another drawback: with $72.8 million in assets, it is the smallest fund in its comparison group, and very small funds are more likely to close.