American Beacon Stephens Mid-Cap Growth Fund Investor Class (STMGX)

Fund Assets	804.72M
Expense Ratio	1.15%
Min. Investment	$2,500
Turnover	51.00%
Dividend (ttm)	n/a
Dividend Yield	n/a
Dividend Growth	n/a
Payout Frequency	n/a
Ex-Dividend Date	Dec 22, 2025

Previous Close	29.27
YTD Return	12.98%
1-Year Return	10.36%
5-Year Return	35.37%
52-Week Low	23.93
52-Week High	35.46
Beta (5Y)	1.10
Holdings	95
Inception Date	Feb 1, 2006

About STMGX

The American Beacon Stephens Mid-Cap Growth Fund Investor Class is a mutual fund that seeks to deliver long-term capital growth by investing primarily in the equity securities of medium-sized U.S. companies. Managed by Stephens Investment Management Group, the fund maintains a focused strategy that emphasizes selecting mid-cap growth companies believed to have above-average earnings growth potential. The management team leverages fundamental analysis to identify opportunities within the mid-cap segment—an area considered by the managers to be less efficiently priced and home to some of the fastest-growing businesses in the public markets. The fund typically invests at least 80% of its net assets in mid-cap stocks, spanning sectors such as technology, healthcare, industrials, and consumer goods. The portfolio is diversified but tends to have concentrated positions in companies demonstrating consistent growth characteristics. As a mid-cap growth fund, it plays a vital role in offering investors exposure to dynamic businesses that may occupy a space between the stability of large-caps and the rapid expansion opportunities of small-caps. The fund is designed for investors seeking exposure to potential capital appreciation from innovative and expanding U.S. businesses.

• Fund Family: American Beacon
• Category: Mid-Cap Growth
• Performance Rating: Above Average
• Risk Rating: Average
• Stock Exchange: Nasdaq
• Ticker Symbol: STMGX
• Share Class: Investor Class
• Index: Russell MidCap Growth TR

Performance

STMGX had a total return of 10.36% in the past year, including dividends. Since the fund's inception, the average annual return has been 9.81%.

Equivalent Funds

These are funds that follow the same index from the other major fund companies.

Symbol	Provider	Name	Expense Ratio
VMGRX	Vanguard	Vanguard Mid-Cap Growth Fund Investor Shares	0.33%
FMDGX	Fidelity	Fidelity Mid Cap Growth Index Fund	0.05%

Other Share Classes

These are alternative share classes of the same fund, from the same provider.

Symbol	Share Class	Expense Ratio
SFMRX	R6 Class	0.88%
SFMIX	R5 Class	0.89%
SMFYX	Y Class	0.95%
SMFAX	A Class	1.20%

Top 10 Holdings

17.84% of assets

Name	Symbol	Weight
U.S. Government Money Market S	n/a	2.17%
Ross Stores, Inc.	ROST	1.94%
TechnipFMC plc	FTI	1.86%
Burlington Stores, Inc.	BURL	1.77%
Axon Enterprise, Inc.	AXON	1.76%
FirstCash Holdings, Inc.	FCFS	1.75%
Illumina, Inc.	ILMN	1.68%
Exelixis, Inc.	EXEL	1.66%
RBC Bearings Incorporated	RBC	1.64%
Fastenal Company	FAST	1.60%

Dividend History

Ex-Dividend	Amount	Pay Date
Dec 22, 2025	$8.7939	Dec 23, 2025
Dec 20, 2024	$1.477	Dec 23, 2024
Dec 22, 2022	$0.7679	Dec 23, 2022
Dec 22, 2020	$0.4497	Dec 23, 2020
Dec 20, 2019	$0.8118	Dec 23, 2019
Dec 20, 2018	$1.671	Dec 21, 2018

Data Sources: Tiingo, Financial Modeling Prep, and more

Historical data is provided by Tiingo. Delayed stock pricing data is provided by Financial Modeling Prep. Several fund data points are also provided by Finnhub.

Last checked:

Oct 8, 2026

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