ETF Evaluator: American Century Mid Cap Gr Insgts ETF () Follow This ETF

American Century Mid Cap Gr Insgts ETF Overview

American Century Mid Cap Gr Insgts ETF (ACMG) is an actively managed U.S. Equity Mid-Cap Growth exchange-traded fund (ETF). American Century Investments launched the ETF in 2020.

The investment seeks long-term capital growth. The fund will invest principally in exchange-traded common stocks. Under normal market conditions, the portfolio managers will invest at least 80% of the fund's assets in securities of medium capitalization companies. The fund may purchase securities of small and large capitalization companies as well. It may engage in active and frequent trading of portfolio securities to achieve its principal investment strategies. The fund is non-diversified.

About American Century Mid Cap Gr Insgts ETF (ACMG)

There are 4 members of the management team with an average tenure of 1.97 years: Nalin Yogasundram (2020), Stephen Quance (2026), Rahul Jadhav (2026) and Yusuf Anwar (2025). Management tenure is more important for actively managed ETFs than passive index ETFs.

The ETF has 2 primary benchmarks: Russell 3000 TR USD index with a weighting of 100% and Russell Mid Cap Growth TR USD index with a weighting of 100%. American Century Mid Cap Gr Insgts ETF has 151 securities in its portfolio. The top 10 holdings constitute 23.9% of the ETF’s assets. The ETF meets the SEC requirement of being classified as a nondiversified fund. The ETF is not considered to have an ESG focus with its investment selection and management.

American Century Mid Cap Gr Insgts ETF is part of the Equity global asset class and is within the U.S. Equity ETF group. American Century Mid Cap Gr Insgts ETF has 1.3% of its portfolio invested in foreign issues. The overall assets allocated to domestic stock is 98.3% There is 1.3% allocated to foreign stock, and 0.0% is allocated to preferred stocks. The bond allocation as a percentage of total assets is 0.0% (0.0% domestic bond, 0.0% foreign bond and 0.0% convertible bond). American Century Mid Cap Gr Insgts ETF has 0.4% of the portfolio in cash.

Assets Under Management

The fund has $100 million in total assets, which is below the $1 billion average for the Mid-Cap Growth category. Normally, lower assets under management translates to higher average expense ratios, and greater total assets are desired. However, for some investment categories, such as small-cap investing, it may be difficult for the manager to fully employ the desired active strategy if assets grow too large or too quickly.

ACMG Performance and Fees

The expense ratio measures how much of a fund’s assets are used for administrative expenses and operating expenses, including adviser fees and fees for the transfer agent and custodial services. The American Century Mid Cap Gr Insgts ETF expense ratio is below average compared to funds in the Mid-Cap Growth category. American Century Mid Cap Gr Insgts ETF has an expense ratio of 0.39%, which is 26% lower than its category average, making the fund expense ratio grade a B. While it is difficult to predict returns, it is known that high annual expense ratios reduce your rate of return, and excessive fees are difficult to overcome. Active management normally comes with higher expense ratios than passive index management. Certain investment categories such as small company and foreign also normally have higher expense ratios. It is best to compare fund expense ratios against the category averages for meaningful assessments.

High portfolio turnover can translate to higher expenses and lower aftertax returns. American Century Mid Cap Gr Insgts ETF has a portfolio turnover rate of 44%, which indicates that it holds its assets around / 0.0 years. By way of comparison, the average portfolio turnover is 161% for the Mid-Cap Growth category.

Recently, in the month of October 2026, American Century Mid Cap Gr Insgts ETF returned -3.5%, which earned it a grade of D, as the Mid-Cap Growth category had an average return of -2.4%. The letter grades of A, B, C, D and F are based upon relative rankings within the investment category. A grade of A, for example, would indicate that the return is in the highest 20% for that time period compared to all ETFs in that category.

American Century Mid Cap Gr Insgts ETF has a trailing yield of 0.11%, which is below the 0.41% category average. The fund normally distributes its income monthly.

It’s natural to seek the best-performing investments, but you must consider the relationship between risk and return and the impact of costs and taxes on your realized returns.

American Century Mid Cap Gr Insgts ETF Grades

Year to date, the ETF has returned 2.9%, 2.7 percentage points worse than the category, which translates into a grade of D. The fund has returned -0.7% over the past year (grade of D), 17.5% over the past three years (grade of C) and 1.8% per year over the past five years (grade of D).

For more ETF grades, analysis and screening tools to help your investment discovery, join AAII for a $2, full-access trial. Learn more here: https://invest.aaii.com/membership.

Otherwise, for more information about American Century Mid Cap Gr Insgts ETF, including its riskiness, submit your email to unlock the rest of the article.