BIGTX vs. FZAMX

Last updated Jun 24, 2026

BIGTX (The Texas Fund) and FZAMX (Fidelity Advisor Mid Cap II Fund Class Z) are both Mid Cap Blend Equities funds. Over the past 10 years, BIGTX returned 10.81%/yr vs 13.32%/yr for FZAMX. Their correlation of 0.88 suggests significant overlap in exposure. BIGTX charges 1.67%/yr vs 0.61%/yr for FZAMX.

Performance

BIGTX vs. FZAMX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in The Texas Fund (BIGTX) and Fidelity Advisor Mid Cap II Fund Class Z (FZAMX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, BIGTX achieves a 22.88% return, which is significantly lower than FZAMX's 26.02% return. Over the past 10 years, BIGTX has underperformed FZAMX with an annualized return of 10.81%, while FZAMX has yielded a comparatively higher 13.32% annualized return.

BIGTX

• 1D: 0.61%
• 1M: 1.28%
• YTD: 22.88%
• 6M: 20.86%
• 1Y: 29.89%
• 3Y*: 20.30%
• 5Y*: 8.90%
• 10Y*: 10.81%

FZAMX

• 1D: 0.68%
• 1M: 6.78%
• YTD: 26.02%
• 6M: 23.47%
• 1Y: 42.35%
• 3Y*: 22.40%
• 5Y*: 12.24%
• 10Y*: 13.32%

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

BIGTX vs. FZAMX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
BIGTX The Texas Fund	22.88%	5.98%	15.76%	11.32%	-6.93%	23.90%	13.11%	9.61%	-11.44%	11.58%
FZAMX Fidelity Advisor Mid Cap II Fund Class Z	26.02%	12.00%	17.39%	15.15%	-14.70%	25.40%	18.84%	23.85%	-14.85%	20.78%

Correlation

The correlation between BIGTX and FZAMX is 0.81, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.81
Correlation (3Y) Calculated over the trailing 3-year period	0.87
Correlation (5Y) Calculated over the trailing 5-year period	0.88
Correlation (10Y) Calculated over the trailing 10-year period	0.88
Correlation (All Time) Calculated using the full available price history since Jan 2, 2014	0.88

The correlation between BIGTX and FZAMX has been stable across timeframes, ranging from 0.81 to 0.88 - a consistent structural relationship.

Return for Risk

BIGTX vs. FZAMX — Risk / Return Rank

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

BIGTX

BIGTX Risk / Return Rank: 66
BIGTX Sharpe Ratio Rank: 62
BIGTX Sortino Ratio Rank: 55
BIGTX Omega Ratio Rank: 50
BIGTX Calmar Ratio Rank: 85
BIGTX Martin Ratio Rank: 76

FZAMX

FZAMX Risk / Return Rank: 83
FZAMX Sharpe Ratio Rank: 83
FZAMX Sortino Ratio Rank: 76
FZAMX Omega Ratio Rank: 71
FZAMX Calmar Ratio Rank: 91
FZAMX Martin Ratio Rank: 92

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.

BIGTX vs. FZAMX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for The Texas Fund (BIGTX) and Fidelity Advisor Mid Cap II Fund Class Z (FZAMX). 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.

Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.

	BIGTX	FZAMX	Difference
Sharpe ratio: Return per unit of total volatility	2.14	2.49	-0.36
Sortino ratio: Return per unit of downside risk	2.87	3.34	-0.48
Omega ratio: Gain probability vs. loss probability	1.36	1.43	-0.07
Calmar ratio: Return relative to maximum drawdown	3.83	4.51	-0.69
Martin ratio: Return relative to average drawdown	13.33	18.03	-4.71

BIGTX vs. FZAMX - Sharpe Ratio Comparison

The current BIGTX Sharpe Ratio is 2.14, which is comparable to the FZAMX Sharpe Ratio of 2.49. The chart below compares the historical Sharpe Ratios of BIGTX and FZAMX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Drawdowns

BIGTX vs. FZAMX - Drawdown Comparison

The maximum BIGTX drawdown since its inception was -77.89%, which is greater than FZAMX's maximum drawdown of -42.32%. Use the drawdown chart below to compare losses from any high point for BIGTX and FZAMX.

Drawdown Indicators

	BIGTX	FZAMX	Difference
Max Drawdown Largest peak-to-trough decline	-77.89%	-42.32%	-35.57%
Max Drawdown (1Y) Largest decline over 1 year	-8.07%	-9.77%	+1.70%
Max Drawdown (3Y) Largest decline over 3 years	-77.89%	-25.24%	-52.65%
Max Drawdown (5Y) Largest decline over 5 years	-77.89%	-25.24%	-52.65%
Max Drawdown (10Y) Largest decline over 10 years	-77.89%	-42.32%	-35.57%
Current Drawdown Current decline from peak	-65.84%	0.00%	-65.84%
Average Drawdown Average peak-to-trough decline	-17.36%	-6.06%	-11.30%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.31%	2.44%	-0.13%

Volatility

BIGTX vs. FZAMX - Volatility Comparison

The Texas Fund (BIGTX) and Fidelity Advisor Mid Cap II Fund Class Z (FZAMX) have volatilities of 5.32% and 5.59%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	BIGTX	FZAMX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.32%	5.59%	-0.27%
Volatility (6M) Calculated over the trailing 6-month period	10.69%	14.18%	-3.49%
Volatility (1Y) Calculated over the trailing 1-year period	14.50%	17.71%	-3.21%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	126.73%	20.29%	+106.44%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	90.68%	20.99%	+69.69%

BIGTX vs. FZAMX - Expense Ratio Comparison

BIGTX has a 1.67% expense ratio, which is higher than FZAMX's 0.61% expense ratio.

Dividends

BIGTX vs. FZAMX - Dividend Comparison

BIGTX's dividend yield for the trailing twelve months is around 6.01%, more than FZAMX's 5.59% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BIGTX The Texas Fund	6.01%	7.38%	3.52%	2.51%	3.06%	5.27%	0.07%	0.08%	2.27%	0.00%	0.00%	0.00%
FZAMX Fidelity Advisor Mid Cap II Fund Class Z	5.59%	10.09%	6.93%	2.83%	5.86%	18.58%	1.41%	3.50%	10.72%	7.81%	5.00%	4.90%

Frequently Asked Questions

Can I hold both BIGTX and FZAMX in my portfolio?

BIGTX and FZAMX have a correlation of 0.81, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, BIGTX or FZAMX?

FZAMX has higher volatility (5.59%) compared to BIGTX (5.32%). In terms of maximum drawdown, BIGTX dropped -77.89% vs FZAMX's -42.32%.

Which has better risk-adjusted returns?

FZAMX currently has the higher Sharpe Ratio (2.49 vs 2.14), meaning it's delivered slightly more return per unit of risk over the trailing 12 months. However, this ranking shifts over time - use the Risk/Return Score above for a more comprehensive view that combines Sharpe, Sortino, and other measures used by quantitative funds.