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.
Thessaloniki Water Supply & Sewerage Co (ATH:EYAPS) Volatility Explanation
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.
Thessaloniki Water Supply & Sewerage Co Volatility Related Terms
ATH:EYAPS vs AWK, WTRG, AWR: Volatility Comparison
For the Utilities - Regulated Water subindustry, Thessaloniki Water Supply & Sewerage Co'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.
Thessaloniki Water Supply & Sewerage Co Volatility vs Utilities - Regulated Industry
Thessaloniki Water Supply & Sewerage Co (ATH:EYAPS) Volatility Calculation
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.
Thessaloniki Water Supply & Sewerage Co (ATH:EYAPS) has a Volatility of 42.72% as of Jun. 28, 2026. Volatility is measured as the annualized standard deviation between monthly returns from the security over the past year. View historical data on Thessaloniki Water Supply & Sewerage Co and its competitors.
Is Thessaloniki Water Supply & Sewerage Co's Volatility too high?
Thessaloniki Water Supply & Sewerage Co's current Volatility is 42.72%. Overall, Thessaloniki Water Supply & Sewerage Co has a GF Score™ of 75/100 and is considered Modestly Overvalued, reflecting its overall financial health beyond just this single metric.
How does Thessaloniki Water Supply & Sewerage Co's Volatility compare to AWK and WTRG?
Thessaloniki Water Supply & Sewerage Co's Volatility of 42.72% 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 Thessaloniki Water Supply & Sewerage Co and its competitors. Thessaloniki Water Supply & Sewerage Co's current Volatility is 42.72%. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Thessaloniki Water Supply & Sewerage Co stock overvalued right now?
Based on GuruFocus' analysis, Thessaloniki Water Supply & Sewerage Co (ATH:EYAPS) is currently considered Modestly Overvalued. The stock's GF Value™ is €3.78, compared to a current price of €4.53 — trading 19.7% above its estimated fair value. The current Volatility is 42.72%. Thessaloniki Water Supply & Sewerage Co's overall GF Score™ is 75/100 with 6 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 Thessaloniki Water Supply & Sewerage Co (ATH:EYAPS), the current Volatility is 42.72% as of Jun. 28, 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 Thessaloniki Water Supply & Sewerage Co (ATH:EYAPS) Overvalued in 2026?
Based on GuruFocus' analysis, Thessaloniki Water Supply & Sewerage Co stock appears to be overvalued.
The current stock price of €4.53 is trading 19.7% above its estimated GF Value™ of €3.78.
GuruFocus considers Thessaloniki Water Supply & Sewerage Co to be Modestly Overvalued.
Key valuation signals for ATH:EYAPS:
Volatility: 42.72%
GF Value™: €3.78 vs. price of €4.53 (19.7% above fair value)
No single metric tells the full story. See the ATH:EYAPS stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
Thessaloniki Water Supply & Sewerage Co Business Description
Thessaloniki Water Supply & Sewerage Co SA is engaged in providing water supply and sewerage services. The company also provides telecommunication services and the production and sale of electricity. The operating segments of the company are the provision of water supply services and the provision of sewerage services, where the provision of water supply services segment derives a majority of the revenue.
75GF Score
Get the complete analysis for ATH:EYAPS
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
ATH:EYAPS has been successfully added to your 