CienaMIL:1CIEN +1.45%53 Days Inventory is 85.64 as of Apr. 2026, which is 26% above its 10-year median of 68.01. GuruFocus rates MIL:1CIEN with a GF Score™ of 53/100 and a GF Value™ of €80.18 (Significantly Overvalued). The stock has 4 warning signs investors should review. Among 2,413 Hardware companies, Ciena ranks worse than 51.26% on this metric.
Days Inventory is also known as Days Sales of Inventory (DSI). Ciena's Average Total Inventories for the
three
months ended in Apr. 2026 was €706 Mil. Ciena's Cost of Goods Sold for the
three
months ended in Apr. 2026 was €752 Mil.
Hence, Ciena's Days Inventory for the
three
months ended in Apr. 2026 was 85.64.
The historical rank and industry rank for Ciena's Days Inventory or its related term are showing as below:
MIL:1CIEN'
s Days Inventory Range Over the Past 10 Years
Min: 51.04 Med: 68.01 Max: 148.78
Current: 97.01
During the past 13 years, Ciena's highest Days Inventory was 148.78. The lowest was 51.04. And the median was 68.01.
MIL:1CIEN's Days Inventory is ranked worse than 51.26% of 2413
companies
in the Hardware industry
Industry Median: 94.29
vs MIL:1CIEN: 97.01
Ciena's Days Inventory
declined
from Apr. 2025 (121.45) to Apr. 2026 (85.64).
Inventory Turnover measures how fast the company turns over its inventory within a year.
Ciena's Inventory Turnover for the
three
months ended in Apr. 2026 was 1.07.
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.
Ciena's Inventory-to-Revenue for the
three
months ended in Apr. 2026 was 0.53.
Ciena (MIL:1CIEN) 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.
Ciena's Inventory Turnover for the
three
months ended in Apr. 2026 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.
Ciena's Inventory to Revenue for the
three
months ended in Apr. 2026 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.
Ciena Days Inventory Related Terms
Ciena Days Inventory Historical Data
* Premium members only.
The historical data trend for Ciena'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.
MIL:1CIEN vs MSI, LITE, HPE: Days Inventory Comparison
For the Communication Equipment subindustry, Ciena'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.
Ciena Days Inventory vs Hardware Industry
For the Hardware industry and Technology sector, Ciena's Days Inventory distribution charts can be found below:
* The bar in red indicates where Ciena'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.
Ciena (MIL:1CIEN) has a Days Inventory of 85.64 as of Apr. 2026. Days inventory represents the average amount of days a company holds inventory before selling it. View historical data on Ciena and its competitors. This is 26% above median its historical median of 68.01. Over the past decade, Ciena's Days Inventory has ranged from 51.04 to 148.78. According to the industry distribution chart, Ciena ranks #1237 out of 2413 companies in the Hardware industry, placing it in the top 51.3%.
Is Ciena's Days Inventory too high?
Ciena's current Days Inventory of 85.64 is 26% above median its 10-year median of 68.01. Over the past 10 years, this metric has ranged from a low of 51.04 to a high of 148.78. The Hardware industry median Days Inventory is 94.29. Ciena's value of 85.64 is 9.2% below this industry median. Based on the distribution chart, Ciena ranks #1237 out of 2413 companies in the Hardware industry, which is below the industry midpoint. Overall, Ciena has a GF Score™ of 53/100 and is considered Significantly Overvalued, reflecting its overall financial health beyond just this single metric.
How does Ciena's Days Inventory compare to MSI and LITE?
According to the Hardware industry distribution chart, Ciena ranks #1237 out of 2413 companies for Days Inventory. This places Ciena in the lower half of its industry. The industry median Days Inventory is 94.29. Ciena's value of 85.64 is 9.2% below this benchmark. Historically, Ciena's own Days Inventory has ranged from 51.04 to 148.78 over the past decade. While the company's 10-year median is 68.01 vs. the industry median of 94.29, Ciena has consistently been below 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 Hardware company?
The median Days Inventory among Hardware companies is 94.29, based on 2,413 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. Ciena's current Days Inventory of 85.64 is 9.2% below 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 Ciena and its competitors. For the Hardware industry, the median Days Inventory is 94.29 — values significantly above this may indicate overvaluation, while values below may suggest a bargain or underlying issues. Ciena's current Days Inventory is 85.64, which is 26% above median its own 10-year median of 68.01. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Ciena stock overvalued right now?
Based on GuruFocus' analysis, Ciena (MIL:1CIEN) is currently considered Significantly Overvalued. The stock's GF Value™ is €80.18, compared to a current price of €385.20 — trading 380.4% above its estimated fair value. The current Days Inventory is 85.64, which is 26% above median its 10-year median of 68.01 and 9.2% below the Hardware industry median of 94.29. Ciena's overall GF Score™ is 53/100 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 Ciena (MIL:1CIEN), the current Days Inventory is 85.64 as of Apr. 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 Ciena (MIL:1CIEN) Overvalued in 2026?
Based on GuruFocus' analysis, Ciena stock appears to be overvalued.
The current stock price of €385.20 is trading 380.4% above its estimated GF Value™ of €80.18.
GuruFocus considers Ciena to be Significantly Overvalued.
Key valuation signals for MIL:1CIEN:
Days Inventory: 85.64 (26% above median its 10-year median of 68.01)
GF Value™: €80.18 vs. price of €385.20 (380.4% above fair value)
Industry Position: 9.2% below the Hardware median (#1237 of 2413)
No single metric tells the full story. See the MIL:1CIEN stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
Ciena is a leader in high-speed optical connectivity, providing systems, components, and automation software for telecom providers and enterprises, such as data centers, to enable long-distance connectivity. The company operates through four primary business segments: networking platforms, platform software and services, Blue Planet automation software, and global services. While telecom carriers remain important customers, cloud providers and hyperscalers now drive a significant portion of the business. To meet the demands of AI data centers, customers are adopting Ciena's WaveLogic 6 platform, the first to support 1.6 terabits-per-second capacity.
53GF Score
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