GLGG.L vs. BIGT.L

Last updated Jun 5, 2026

GLGG.L (L&G Clean Water UCITS ETF) and BIGT.L (L&G Pharma Breakthrough UCITS ETF) are both exchange-traded funds - GLGG.L is a Water Equities fund tracking the S&P Global Water TR, while BIGT.L is a Health & Biotech Equities fund tracking the NASDAQ Biotechnology TR USD. Both are passively managed. Over the past 5 years, GLGG.L returned 6.66%/yr vs 2.49%/yr for BIGT.L. At a 0.48 correlation, their price movements are largely independent. Both charge a 0.49% expense ratio.

Performance

GLGG.L vs. BIGT.L - Performance Comparison

The chart below illustrates the hypothetical performance of a £10,000 investment in L&G Clean Water UCITS ETF (GLGG.L) and L&G Pharma Breakthrough UCITS ETF (BIGT.L). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, GLGG.L achieves a 2.12% return, which is significantly higher than BIGT.L's -0.70% return.

GLGG.L

• 1D: 0.49%
• 1M: -0.96%
• YTD: 2.12%
• 6M: 1.19%
• 1Y: 9.96%
• 3Y*: 8.33%
• 5Y*: 6.66%
• 10Y*: —

BIGT.L

• 1D: 2.65%
• 1M: -3.25%
• YTD: -0.70%
• 6M: -3.88%
• 1Y: 25.65%
• 3Y*: 2.96%
• 5Y*: 2.49%
• 10Y*: —

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

GLGG.L vs. BIGT.L - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019
GLGG.L L&G Clean Water UCITS ETF	2.12%	7.81%	5.74%	14.58%	-7.49%	27.84%	14.27%	4.99%
BIGT.L L&G Pharma Breakthrough UCITS ETF	-0.70%	27.03%	-3.16%	-14.88%	2.68%	-2.30%	23.89%	-0.12%

Correlation

The correlation between GLGG.L and BIGT.L is 0.43, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.43
Correlation (3Y) Calculated over the trailing 3-year period	0.45
Correlation (5Y) Calculated over the trailing 5-year period	0.48
Correlation (All Time) Calculated using the full available price history since Jul 17, 2019	0.48

GLGG.L vs. BIGT.L - Sectors Allocation Comparison

Sectors	GLGG.L	BIGT.L
Industrials	65.2%	-
Utilities	15.8%	-
Basic Materials	9.0%	2.7%
Technology	6.4%	-
Healthcare	1.9%	97.3%
Consumer Defensive	1.7%	-
Communication Services	-	-
Consumer Cyclical	-	-
Energy	-	-
Financial Services	-	-
Real Estate	-	-

Return for Risk

GLGG.L vs. BIGT.L — Risk / Return Rank

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

GLGG.L

GLGG.L Risk / Return Rank: 21
GLGG.L Sharpe Ratio Rank: 22
GLGG.L Sortino Ratio Rank: 21
GLGG.L Omega Ratio Rank: 21
GLGG.L Calmar Ratio Rank: 20
GLGG.L Martin Ratio Rank: 20

BIGT.L

BIGT.L Risk / Return Rank: 43
BIGT.L Sharpe Ratio Rank: 40
BIGT.L Sortino Ratio Rank: 41
BIGT.L Omega Ratio Rank: 37
BIGT.L Calmar Ratio Rank: 53
BIGT.L Martin Ratio Rank: 45

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.

GLGG.L vs. BIGT.L - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for L&G Clean Water UCITS ETF (GLGG.L) and L&G Pharma Breakthrough UCITS ETF (BIGT.L). 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.

	GLGG.L	BIGT.L	Difference
Sharpe ratio: Return per unit of total volatility	0.72	1.39	-0.67
Sortino ratio: Return per unit of downside risk	1.07	2.04	-0.97
Omega ratio: Gain probability vs. loss probability	1.13	1.24	-0.11
Calmar ratio: Return relative to maximum drawdown	0.85	2.57	-1.72
Martin ratio: Return relative to average drawdown	2.15	7.42	-5.27
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

GLGG.L vs. BIGT.L - Sharpe Ratio Comparison

The current GLGG.L Sharpe Ratio is 0.72, which is lower than the BIGT.L Sharpe Ratio of 1.39. The chart below compares the historical Sharpe Ratios of GLGG.L and BIGT.L, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	GLGG.L	BIGT.L	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.72	1.39	-0.67
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.44	0.15	+0.29
Sharpe Ratio (All Time) Calculated using the full available price history	0.58	0.22	+0.36

Drawdowns

GLGG.L vs. BIGT.L - Drawdown Comparison

The maximum GLGG.L drawdown since its inception was -27.08%, smaller than the maximum BIGT.L drawdown of -30.23%. Use the drawdown chart below to compare losses from any high point for GLGG.L and BIGT.L.

Drawdown Indicators

	GLGG.L	BIGT.L	Difference
Max Drawdown Largest peak-to-trough decline	-27.08%	-30.23%	+3.15%
Max Drawdown (1Y) Largest decline over 1 year	-11.62%	-9.93%	-1.69%
Max Drawdown (3Y) Largest decline over 3 years	-16.35%	-23.74%	+7.39%
Max Drawdown (5Y) Largest decline over 5 years	-18.82%	-30.23%	+11.41%
Current Drawdown Current decline from peak	-8.46%	-5.41%	-3.05%
Average Drawdown Average peak-to-trough decline	-5.14%	-10.57%	+5.43%
Ulcer Index Depth and duration of drawdowns from previous peaks	4.63%	3.45%	+1.18%

Volatility

GLGG.L vs. BIGT.L - Volatility Comparison

The current volatility for L&G Clean Water UCITS ETF (GLGG.L) is 4.33%, while L&G Pharma Breakthrough UCITS ETF (BIGT.L) has a volatility of 6.35%. This indicates that GLGG.L experiences smaller price fluctuations and is considered to be less risky than BIGT.L based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	GLGG.L	BIGT.L	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.33%	6.35%	-2.02%
Volatility (6M) Calculated over the trailing 6-month period	11.10%	14.10%	-3.00%
Volatility (1Y) Calculated over the trailing 1-year period	13.76%	18.38%	-4.62%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	15.04%	16.86%	-1.82%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	17.68%	18.38%	-0.70%

GLGG.L vs. BIGT.L - Expense Ratio Comparison

Both GLGG.L and BIGT.L have an expense ratio of 0.49%.

Dividends

GLGG.L vs. BIGT.L - Dividend Comparison

Neither GLGG.L nor BIGT.L has paid dividends to shareholders.

Tickers have no history of dividend payments

Frequently Asked Questions

Can I hold both GLGG.L and BIGT.L in my portfolio?

GLGG.L and BIGT.L have a correlation of 0.43, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which ETF is better, GLGG.L or BIGT.L?

Both ETFs have the same 0.49% expense ratio. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF is cheaper, GLGG.L or BIGT.L?

GLGG.L and BIGT.L have the same expense ratio: 0.49% per year.

What is the main difference between GLGG.L and BIGT.L?

GLGG.L is categorized as Water Equities, while BIGT.L is Health & Biotech Equities. GLGG.L tracks S&P Global Water TR, while BIGT.L tracks NASDAQ Biotechnology TR USD.