FDG vs. BUFSX

Last updated Apr 1, 2026

Compare and contrast key facts about American Century Focused Dynamic Growth ETF (FDG) and Buffalo Small Cap Fund (BUFSX).

FDG is an actively managed fund by American Century. It was launched on Mar 31, 2020. BUFSX is managed by Buffalo. It was launched on Apr 14, 1998.

Performance

FDG vs. BUFSX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Century Focused Dynamic Growth ETF (FDG) and Buffalo Small Cap Fund (BUFSX). The values are adjusted to include any dividend payments, if applicable.

FDG vs. BUFSX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020
FDG American Century Focused Dynamic Growth ETF	-10.09%	22.13%	45.89%	37.22%	-35.74%	8.52%	93.61%
BUFSX Buffalo Small Cap Fund	-7.54%	-0.13%	5.38%	5.45%	-30.01%	4.44%	120.58%

Returns By Period

In the year-to-date period, FDG achieves a -10.09% return, which is significantly lower than BUFSX's -7.54% return.

FDG

• 1D: 4.35%
• 1M: -4.42%
• YTD: -10.09%
• 6M: -5.30%
• 1Y: 25.52%
• 3Y*: 24.88%
• 5Y*: 8.73%
• 10Y*: —

BUFSX

• 1D: -1.58%
• 1M: -11.35%
• YTD: -7.54%
• 6M: -7.29%
• 1Y: 2.46%
• 3Y*: -1.05%
• 5Y*: -6.73%
• 10Y*: 8.96%

*Multi-year figures are annualized to reflect compound growth (CAGR)

FDG vs. BUFSX - Expense Ratio Comparison

FDG has a 0.45% expense ratio, which is lower than BUFSX's 1.01% expense ratio.

BUFSX

Buffalo Small Cap Fund

FDG

American Century Focused Dynamic Growth ETF

Return for Risk

FDG vs. BUFSX — Risk / Return Rank

Compare risk-adjusted metric ranks to identify better-performing investments over the past 12 months.

FDG

FDG Risk / Return Rank: 64
FDG Sharpe Ratio Rank: 63
FDG Sortino Ratio Rank: 69
FDG Omega Ratio Rank: 64
FDG Calmar Ratio Rank: 65
FDG Martin Ratio Rank: 60

BUFSX

BUFSX Risk / Return Rank: 7
BUFSX Sharpe Ratio Rank: 7
BUFSX Sortino Ratio Rank: 8
BUFSX Omega Ratio Rank: 7
BUFSX Calmar Ratio Rank: 6
BUFSX Martin Ratio Rank: 6

The rank (0–100) shows how this investment's returns compare to the risk taken. Higher = better. Based on the past 12 months of data, combining Sharpe, Sortino, and other metrics used by quantitative funds and institutional investors.

FDG vs. BUFSX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Century Focused Dynamic Growth ETF (FDG) and Buffalo Small Cap Fund (BUFSX). Risk-adjusted metrics are performance indicators that assess an investment's returns in relation to its risk, enabling a more accurate comparison of different investment options.

	FDG	BUFSX	Difference
Sharpe ratio Return per unit of total volatility	1.08	0.09	+0.99
Sortino ratio Return per unit of downside risk	1.67	0.30	+1.37
Omega ratio Gain probability vs. loss probability	1.23	1.04	+0.19
Calmar ratio Return relative to maximum drawdown	1.58	0.01	+1.57
Martin ratio Return relative to average drawdown	5.57	0.03	+5.53
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

FDG vs. BUFSX - Sharpe Ratio Comparison

The current FDG Sharpe Ratio is 1.08, which is higher than the BUFSX Sharpe Ratio of 0.09. The chart below compares the historical Sharpe Ratios of FDG and BUFSX, offering insights into how both investments have performed under varying market conditions. These values are calculated using daily returns over the previous 12 months.

Sharpe Ratios by Period

	FDG	BUFSX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.08	0.09	+0.99
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.36	-0.27	+0.63
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.37	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.80	0.43	+0.36

Correlation

The correlation between FDG and BUFSX is 0.79, which is considered to be high. That indicates a strong positive relationship between their price movements. Having highly-correlated positions in a portfolio may signal a lack of diversification, potentially leading to increased risk during market downturns.

Dividends

FDG vs. BUFSX - Dividend Comparison

Neither FDG nor BUFSX has paid dividends to shareholders.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FDG American Century Focused Dynamic Growth ETF	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.01%	0.00%	0.00%	0.00%	0.00%	0.00%
BUFSX Buffalo Small Cap Fund	0.00%	0.00%	0.00%	0.00%	0.00%	13.53%	9.01%	9.14%	31.02%	30.30%	25.19%	70.18%

Drawdowns

FDG vs. BUFSX - Drawdown Comparison

The maximum FDG drawdown since its inception was -43.69%, smaller than the maximum BUFSX drawdown of -53.24%. Use the drawdown chart below to compare losses from any high point for FDG and BUFSX.

Drawdown Indicators

	FDG	BUFSX	Difference
Max Drawdown Largest peak-to-trough decline	-43.69%	-53.24%	+9.55%
Max Drawdown (1Y) Largest decline over 1 year	-15.71%	-14.92%	-0.79%
Max Drawdown (5Y) Largest decline over 5 years	-43.69%	-46.57%	+2.88%
Max Drawdown (10Y) Largest decline over 10 years	—	-46.74%	—
Current Drawdown Current decline from peak	-12.04%	-37.02%	+24.98%
Average Drawdown Average peak-to-trough decline	-13.75%	-12.82%	-0.93%
Ulcer Index Depth and duration of drawdowns from previous peaks	4.45%	4.21%	+0.24%

Volatility

FDG vs. BUFSX - Volatility Comparison

American Century Focused Dynamic Growth ETF (FDG) has a higher volatility of 7.98% compared to Buffalo Small Cap Fund (BUFSX) at 6.37%. This indicates that FDG's price experiences larger fluctuations and is considered to be riskier than BUFSX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FDG	BUFSX	Difference
Volatility (1M) Calculated over the trailing 1-month period	7.98%	6.37%	+1.61%
Volatility (6M) Calculated over the trailing 6-month period	14.04%	13.84%	+0.20%
Volatility (1Y) Calculated over the trailing 1-year period	23.85%	23.32%	+0.53%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	24.68%	24.65%	+0.03%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	25.05%	24.50%	+0.55%