Volatility is a statistical measure of the dispersion of returns for a given security or market index, it shows how the price swings around its mean. The volatility here is measured as the annualized standard deviation between monthly returns from the security over the past year. In most cases, the higher the volatility, the riskier the security.
Volatility is a statistical measure of the dispersion of returns for a given security or market index. It’s often measured as standard deviation or variance of historical returns over a certain period. The volatility here is measured as the annualized standard deviation between monthly returns from the security over the past year.
Volatility reflects the uncertainty or risk of a security’s value. Generally speaking, a higher volatility suggests a higher risk, because it implies a wider fluctuation around average price. This means the price of the security can change dramatically in either direction within a short period. Conversely, a lower volatility means that the security's price is more steady, which suggests a lower risk.
Another measurement of relative volatility is Beta. Beta is a measure of systematic risk of a security or a portfolio in comparison to the market as a whole. Beta is usually compared to 1. A beta of greater than 1 indicates that the security's price will be more volatile than the market.
REN-Redes Energeticas Nacionais Sgps Volatility Related Terms
STU:RN4 vs SRE, AES: Volatility Comparison
For the Utilities - Diversified subindustry, REN-Redes Energeticas Nacionais Sgps's Volatility, along with its competitors' market caps and Volatility data, can be viewed below:
* Competitive companies are chosen from companies within the same industry, with headquarter located in same country, with closest market capitalization; x-axis shows the market cap, and y-axis shows the term value; the bigger the dot, the larger the market cap. Note that "N/A" values will not show up in the chart.
REN-Redes Energeticas Nacionais Sgps Volatility vs Utilities - Regulated Industry
For the Utilities - Regulated industry and Utilities sector, REN-Redes Energeticas Nacionais Sgps's Volatility distribution charts can be found below:
* The bar in red indicates where REN-Redes Energeticas Nacionais Sgps's Volatility falls into.
The annualized volatility is calculated as following:
σA
=
σM
*
√12
=
√ 1/(n-1) ∑(Ri - R')^2
*
√12
Where: σM is the monthly volatility, n is the number of months in the period, Ri is the security's historical monthly returns and R' is the arithmetic mean of monthly returns.
* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD. * For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.
REN-Redes Energeticas Nacionais Sgps (STU:RN4) has a Volatility of 16.11% as of Jun. 24, 2026. Volatility is measured as the annualized standard deviation between monthly returns from the security over the past year. View historical data on REN-Redes Energeticas Nacionais Sgps and its competitors.
Is REN-Redes Energeticas Nacionais Sgps' Volatility too high?
REN-Redes Energeticas Nacionais Sgps' current Volatility is 16.11%. Overall, REN-Redes Energeticas Nacionais Sgps has a GF Score™ of 83/100 and is considered Modestly Overvalued, reflecting its overall financial health beyond just this single metric.
How does REN-Redes Energeticas Nacionais Sgps' Volatility compare to SRE and AES?
REN-Redes Energeticas Nacionais Sgps' Volatility of 16.11% can be compared against companies in the Utilities - Regulated industry. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good Volatility for an Utilities - Regulated company?
A good Volatility depends on the Utilities - Regulated industry context. However, Volatility should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. Use the industry distribution chart on this page to see where any company falls relative to its peers.
What does a high Volatility mean?
A high Volatility can signal that a stock is expensive relative to its fundamentals. Volatility is measured as the annualized standard deviation between monthly returns from the security over the past year. View historical data on REN-Redes Energeticas Nacionais Sgps and its competitors. REN-Redes Energeticas Nacionais Sgps's current Volatility is 16.11%. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is REN-Redes Energeticas Nacionais Sgps stock overvalued right now?
Based on GuruFocus' analysis, REN-Redes Energeticas Nacionais Sgps (STU:RN4) is currently considered Modestly Overvalued. The stock's GF Value™ is €2.90, compared to a current price of €3.55 — trading 22.4% above its estimated fair value. The current Volatility is 16.11%. REN-Redes Energeticas Nacionais Sgps' overall GF Score™ is 83/100 with 11 warning signs to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is Volatility calculated?
Volatility is calculated from a company's financial statements. For REN-Redes Energeticas Nacionais Sgps (STU:RN4), the current Volatility is 16.11% as of Jun. 24, 2026. GuruFocus calculates this using data sourced from SEC filings and annual reports. See the calculation section and 30-year financial data on this page for the full breakdown.
Is REN-Redes Energeticas Nacionais Sgps (STU:RN4) Overvalued in 2026?
Based on GuruFocus' analysis, REN-Redes Energeticas Nacionais Sgps stock appears to be overvalued.
The current stock price of €3.55 is trading 22.4% above its estimated GF Value™ of €2.90.
GuruFocus considers REN-Redes Energeticas Nacionais Sgps to be Modestly Overvalued.
Key valuation signals for STU:RN4:
Volatility: 16.11%
GF Value™: €2.90 vs. price of €3.55 (22.4% above fair value)
No single metric tells the full story. See the STU:RN4 stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
REN-Redes Energeticas Nacionais Sgps Business Description
REN-Redes Energeticas Nacionais Sgps SA is an energy and utility company that operates as the primary concession holder for electricity transmission and natural gas transportation in Portugal. It manages the national high-voltage electricity grid, high-pressure natural gas pipelines, LNG terminal, and underground storage, focusing on energy transition, sustainability, and security of supply. The Group presently has two main business segments, Electricity and Gas, and a secondary business of Telecommunications.
83GF Score
Get the complete analysis for STU:RN4
Volatility is just one metric. See GF Value™, 30-year financials, guru trades, warning signs, and more.
Quick Browse
Personalize
Premium Gurus 
Create New Portfolio
STU:RN4 has been successfully added to your 