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.
DuratekROCO:8098 -2.40%66 Days Inventory is 155.72 as of Dec. 2025, which is 3% above its 10-year median of 151.60. GuruFocus rates ROCO:8098 with a GF Score™ of 66/100 and a GF Value™ of NT$285.25 (Significantly Overvalued). The stock has 4 warning signs investors should review. Among 983 Semiconductors companies, Duratek ranks worse than 61.95% on this metric.
Days Inventory is also known as Days Sales of Inventory (DSI). Duratek's Average Total Inventories for the
six
months ended in Dec. 2025 was NT$120.6 Mil. Duratek's Cost of Goods Sold for the
six
months ended in Dec. 2025 was NT$141.3 Mil.
Hence, Duratek's Days Inventory for the
six
months ended in Dec. 2025 was 155.72.
The historical rank and industry rank for Duratek's Days Inventory or its related term are showing as below:
ROCO:8098'
s Days Inventory Range Over the Past 10 Years
Min: 141.01 Med: 151.6 Max: 221.5
Current: 141.01
During the past 6 years, Duratek's highest Days Inventory was 221.50. The lowest was 141.01. And the median was 151.60.
ROCO:8098's Days Inventory is ranked worse than 61.95% of 983
companies
in the Semiconductors industry
Industry Median: 112.18
vs ROCO:8098: 141.01
Duratek's Days Inventory
increased
from Dec. 2024 (143.69) to Dec. 2025 (155.72).
It might indicate that Duratek's sales slowed down.
Inventory Turnover measures how fast the company turns over its inventory within a year.
Duratek's Inventory Turnover for the
six
months ended in Dec. 2025 was 1.17.
Inventory-to-Revenue determines the ability of a company to manage their inventory levels. It measures the percentage of Inventories the company currently has on hand to support the current amount of Revenue.
Duratek's Inventory-to-Revenue for the
six
months ended in Dec. 2025 was 0.42.
Duratek (ROCO:8098) Days Inventory Explanation
Days Inventory indicates the liquidity of the inventory. Generally, a lower Days Inventory is preferred as it indicates a shorter duration to clear off the inventory. An increase of the ratio may indicate the company's sales slowed. Similar ratios related to Days Inventory are:
1. Inventory Turnover measures how fast the company turns over its inventory within a year.
Duratek's Inventory Turnover for the
six
months ended in Dec. 2025 is calculated as
2. Inventory-to-Revenue determines the ability of a company to manage their inventory levels. It measures the percentage of Inventories the company currently has on hand to support the current amount of Revenue.
Duratek's Inventory to Revenue for the
six
months ended in Dec. 2025 is calculated as
* 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.
Be Aware
A lot of business are seasonable. It makes more sense to compare Days Inventory from the same period in the previous year instead of from the previous quarter.
Duratek Days Inventory Related Terms
Duratek Days Inventory Historical Data
* Premium members only.
The historical data trend for Duratek's Days Inventory can be seen below:
* 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.
ROCO:8098 vs AMAT, LRCX, KLAC: Days Inventory Comparison
For the Semiconductor Equipment & Materials subindustry, Duratek's Days Inventory, along with its competitors' market caps and Days Inventory 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.
Duratek Days Inventory vs Semiconductors Industry
For the Semiconductors industry and Technology sector, Duratek's Days Inventory distribution charts can be found below:
* The bar in red indicates where Duratek's Days Inventory falls into.
* 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.
Duratek (ROCO:8098) has a Days Inventory of 155.72 as of Dec. 2025. Days inventory represents the average amount of days a company holds inventory before selling it. View historical data on Duratek and its competitors. This is near median its historical median of 151.60. Over the past decade, Duratek's Days Inventory has ranged from 141.01 to 221.50. According to the industry distribution chart, Duratek ranks #609 out of 983 companies in the Semiconductors industry, placing it in the top 62%.
Is Duratek's Days Inventory too high?
Duratek's current Days Inventory of 155.72 is near median its 10-year median of 151.60. Over the past 10 years, this metric has ranged from a low of 141.01 to a high of 221.50. The Semiconductors industry median Days Inventory is 112.18. Duratek's value of 155.72 is 38.8% above this industry median. Based on the distribution chart, Duratek ranks #609 out of 983 companies in the Semiconductors industry, which is below the industry midpoint. Overall, Duratek has a GF Score™ of 66/100 and is considered Significantly Overvalued, reflecting its overall financial health beyond just this single metric.
How does Duratek's Days Inventory compare to AMAT and LRCX?
According to the Semiconductors industry distribution chart, Duratek ranks #609 out of 983 companies for Days Inventory. This places Duratek in the lower half of its industry. The industry median Days Inventory is 112.18. Duratek's value of 155.72 is 38.8% above this benchmark. Historically, Duratek's own Days Inventory has ranged from 141.01 to 221.50 over the past decade. While the company's 10-year median is 151.60 vs. the industry median of 112.18, Duratek 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 Days Inventory for a Semiconductors company?
The median Days Inventory among Semiconductors companies is 112.18, based on 983 companies in the industry. Companies in the top quartile (top 25%) have a Days Inventory significantly above this median, while those in the bottom quartile fall well below. However, Days Inventory should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. Duratek's current Days Inventory of 155.72 is 38.8% 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 Days Inventory mean?
A high Days Inventory can signal that a stock is expensive relative to its fundamentals. Days inventory represents the average amount of days a company holds inventory before selling it. View historical data on Duratek and its competitors. For the Semiconductors industry, the median Days Inventory is 112.18 — values significantly above this may indicate overvaluation, while values below may suggest a bargain or underlying issues. Duratek's current Days Inventory is 155.72, which is near median its own 10-year median of 151.60. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Duratek stock overvalued right now?
Based on GuruFocus' analysis, Duratek (ROCO:8098) is currently considered Significantly Overvalued. The stock's GF Value™ is NT$285.25, compared to a current price of NT$406.00 — trading 42.3% above its estimated fair value. The current Days Inventory is 155.72, which is near median its 10-year median of 151.60 and 38.8% above the Semiconductors industry median of 112.18. Duratek's overall GF Score™ is 66/100 with 4 warning signs to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is Days Inventory calculated?
Days Inventory is calculated from a company's financial statements. For Duratek (ROCO:8098), the current Days Inventory is 155.72 as of Dec. 2025. 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 Duratek (ROCO:8098) Overvalued in 2026?
Based on GuruFocus' analysis, Duratek stock appears to be overvalued.
The current stock price of NT$406.00 is trading 42.3% above its estimated GF Value™ of NT$285.25.
GuruFocus considers Duratek to be Significantly Overvalued.
Key valuation signals for ROCO:8098:
Days Inventory: 155.72 (near median its 10-year median of 151.60)
GF Value™: NT$285.25 vs. price of NT$406.00 (42.3% above fair value)
Industry Position: 38.8% above the Semiconductors median (#609 of 983)
No single metric tells the full story. See the ROCO:8098 stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
Duratek Inc is engaged in the research, development, manufacture and sale of parts, components of front-end semiconductor processing equipment, subsystem equipment, monocrystalline silicon product above 8 inches and the refurbishment of semiconductor equipment. Its products include CVD shower plate, heater, chamber kits, susceptor, collimator, and ceramic susecptor, among others. The company is specialized in precision machining, anodization, E-Bean welding, plasma coating, brazing. Geographically, the company operates in Taiwan; America; and Asia, of which it derives maximum revenue from Asia.
66GF Score
Get the complete analysis for ROCO:8098
Days Inventory is just one metric. See GF Value™, 30-year financials, guru trades, warning signs, and more.
Quick Browse
Personalize
Premium Gurus 
Create New Portfolio
ROCO:8098 has been successfully added to your 
