Focused on building reliable datasets, financial models, and research tools for value-minded investors. Committed to turning complex data into practical guidance for value-investing and long-term wealth.
Dr. Charlie Tian is the founder and CEO of GuruFocus.com, a leading global investment research platform established in 2004. With a Ph.D. in physics, Dr. Tian transitioned from science to finance, applying a data-driven, disciplined approach to value investing.
NAPCO Security TechnologiesNSSC -1.06%90 Shiller PE Ratio is 50.49 as of Sep. 14, 2026, which is 49% below its 10-year median of 98.47. GuruFocus rates NSSC with a GF Score™ of 90/100 and a GF Value™ of $42.83 (Modestly Undervalued). The stock has 1 warning sign investors should review. Among 555 Business Services companies, NAPCO Security Technologies ranks worse than 88.65% on this metric.
The historical rank and industry rank for NAPCO Security Technologies's Shiller PE Ratio or its related term are showing as below:
NSSC'
s Shiller PE Ratio Range Over the Past 10 Years
Min: 36.21 Med: 98.47 Max: 370
Current: 50.51
During the past years, NAPCO Security Technologies's highest Shiller PE Ratio was 370.00. The lowest was 36.21. And the median was 98.47.
NSSC's Shiller PE Ratio is ranked worse than 88.65% of 555
companies
in the Business Services industry
Industry Median: 18.85
vs NSSC: 50.51
E10 is a concept invented by Prof. Robert Shiller, who uses E10 for his Shiller PE Ratio calculation. E10 is the average of the inflation adjusted earnings of a company over the past 10 years.
NAPCO Security Technologies's adjusted earnings per share data for the three months ended in Jun. 2026 was $0.500. Add all the adjusted EPS for the past 10 years together and divide 10 will get our E10, which is $0.71 for the trailing ten years ended in Jun. 2026.
Shiller PE for Stocks: The True Measure of Stock Valuation
NAPCO Security Technologies (NAS:NSSC) Shiller PE Ratio Explanation
Compared with the regular PE Ratio, which works poorly for cyclical businesses, the Shiller PE Ratio smoothed out the fluctuations of profit margins during business cycles. Therefore it is more accurate in reflecting the valuation of the company.
If a company has consistent business performance, the Shiller PE Ratio should give similar results to regular PE Ratio.
Compared with the PS Ratio, the Shiller PE Ratio makes the comparison between different industries more meaningful.
Be Aware
Shiller PE Ratio assumes that over the long term, businesses and profitability revert to their means. If a company's business model does not work in the future compared with the past, Shiller PE Ratio and PS Ratio will give false valuations.
NAPCO Security Technologies Shiller PE Ratio Related Terms
NAPCO Security Technologies Shiller PE Ratio Historical Data
* 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.
NAPCO Security Technologies Shiller PE Ratio Chart
NSSC vs EVLV, MG, CIX: Shiller PE Ratio Comparison
For the Security & Protection Services subindustry, NAPCO Security Technologies's Shiller PE Ratio, along with its competitors' market caps and Shiller PE Ratio 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.
NAPCO Security Technologies Shiller PE Ratio vs Business Services Industry
For the Business Services industry and Industrials sector, NAPCO Security Technologies's Shiller PE Ratio distribution charts can be found below:
* The bar in red indicates where NAPCO Security Technologies's Shiller PE Ratio falls into.
NAPCO Security Technologies Shiller PE Ratio Calculation
For Shiller PE Ratio, the earnings of the past 10 years are inflation-adjusted and averaged. The result is used for P/E calculation. Since it looks at the average over the last 10 years, the Shiller PE Ratio is also called PE10.
The Shiller PE Ratio was first used by professor Robert Shiller to measure the valuation of the overall market. The same calculation is applied here to individual companies.
* 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.
Add all the adjusted EPS together and divide 10 will get our E10.
Please note that we use the CPI data of the country/region where the company is headquartered. If the CPI data for that country/region is not available, then we will use the CPI data of the United States as default.
NAPCO Security Technologies (NSSC) has a Shiller PE Ratio of 50.49 as of Sep. 14, 2026. Shiller price-earnings ratio is the ratio of share price to a company's inflation-adjusted earnings over a 10-year period. View historical data on NAPCO Security Technologies and its competitors. This is 49% below median its historical median of 98.47. Over the past decade, NAPCO Security Technologies' Shiller PE Ratio has ranged from 36.21 to 370.00. According to the industry distribution chart, NAPCO Security Technologies ranks #492 out of 555 companies in the Business Services industry, placing it in the top 88.6%.
Is NAPCO Security Technologies' Shiller PE Ratio too high?
NAPCO Security Technologies' current Shiller PE Ratio of 50.49 is 49% below median its 10-year median of 98.47. Over the past 10 years, this metric has ranged from a low of 36.21 to a high of 370.00. The Business Services industry median Shiller PE Ratio is 18.85. NAPCO Security Technologies' value of 50.49 is 167.9% above this industry median. Based on the distribution chart, NAPCO Security Technologies ranks #492 out of 555 companies in the Business Services industry, which is in the bottom quartile relative to peers. Overall, NAPCO Security Technologies has a GF Score™ of 90/100 and is considered Modestly Undervalued, reflecting its overall financial health beyond just this single metric.
How does NAPCO Security Technologies' Shiller PE Ratio compare to EVLV and MG?
According to the Business Services industry distribution chart, NAPCO Security Technologies ranks #492 out of 555 companies for Shiller PE Ratio. This places NAPCO Security Technologies in the lower half of its industry. The industry median Shiller PE Ratio is 18.85. NAPCO Security Technologies' value of 50.49 is 167.9% above this benchmark. Historically, NAPCO Security Technologies' own Shiller PE Ratio has ranged from 36.21 to 370.00 over the past decade. While the company's 10-year median is 98.47 vs. the industry median of 18.85, NAPCO Security Technologies has consistently been above the industry average. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good Shiller PE Ratio for a Business Services company?
The median Shiller PE Ratio among Business Services companies is 18.85, based on 555 companies in the industry. Companies in the top quartile (top 25%) have a Shiller PE Ratio significantly above this median, while those in the bottom quartile fall well below. However, Shiller PE Ratio should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. NAPCO Security Technologies's current Shiller PE Ratio of 50.49 is 167.9% above the industry median. Use the industry distribution chart on this page to see where any company falls relative to its peers.
What does a high Shiller PE Ratio mean?
A high Shiller PE Ratio can signal that a stock is expensive relative to its fundamentals. Shiller price-earnings ratio is the ratio of share price to a company's inflation-adjusted earnings over a 10-year period. View historical data on NAPCO Security Technologies and its competitors. For the Business Services industry, the median Shiller PE Ratio is 18.85 — values significantly above this may indicate overvaluation, while values below may suggest a bargain or underlying issues. NAPCO Security Technologies's current Shiller PE Ratio is 50.49, which is 49% below median its own 10-year median of 98.47. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is NAPCO Security Technologies stock overvalued right now?
Based on GuruFocus' analysis, NAPCO Security Technologies (NSSC) is currently considered Modestly Undervalued. The stock's GF Value™ is $42.83, compared to a current price of $35.85 — trading 16.3% below its estimated fair value. The current Shiller PE Ratio is 50.49, which is 49% below median its 10-year median of 98.47 and 167.9% above the Business Services industry median of 18.85. NAPCO Security Technologies' overall GF Score™ is 90/100 with 1 warning sign to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is Shiller PE Ratio calculated?
Shiller PE Ratio is calculated from a company's financial statements. For NAPCO Security Technologies (NSSC), the current Shiller PE Ratio is 50.49 as of Sep. 14, 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 NAPCO Security Technologies (NSSC) Overvalued in 2026?
Based on GuruFocus' analysis, NAPCO Security Technologies stock appears to be undervalued.
The current stock price of $35.85 is trading 16.3% below its estimated GF Value™ of $42.83.
GuruFocus considers NAPCO Security Technologies to be Modestly Undervalued.
Key valuation signals for NSSC:
Shiller PE Ratio: 50.49 (49% below median its 10-year median of 98.47)
GF Value™: $42.83 vs. price of $35.85 (16.3% below fair value)
Industry Position: 167.9% above the Business Services median (#492 of 555)
No single metric tells the full story. See the NSSC stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
NAPCO Security Technologies Inc manufactures security products, encompassing access control systems, door-locking products, intrusion and fire alarm systems and video surveillance products. Its products are used for various applications which includes alarm systems like automatic communicators, combination control panels/digital communicators and digital keypad systems, fire alarm control panel and area detectors mainly used for commercial, residential, institutional, industrial and governmental uses. Geographically, the company derives a majority of its revenue from the United States.
90GF Score
Get the complete analysis for NSSC
Shiller PE Ratio is just one metric. See GF Value™, 30-year financials, guru trades, warning signs, and more.
Quick Browse
Personalize
Premium Gurus 
Create New Portfolio
NSSC has been successfully added to your 
