IlluminaXSWX:ILMN -0.79%76 Days Inventory is 145.74 as of Mar. 2026, which is 15% above its 10-year median of 126.70. GuruFocus rates XSWX:ILMN with a GF Score™ of 76/100 and a GF Value™ of CHF105.51. The stock has 7 warning signs investors should review. Among 177 Medical Diagnostics & Research companies, Illumina ranks worse than 77.4% on this metric.
Days Inventory is also known as Days Sales of Inventory (DSI). Illumina's Average Total Inventories for the
three
months ended in Mar. 2026 was CHF465 Mil. Illumina's Cost of Goods Sold for the
three
months ended in Mar. 2026 was CHF291 Mil.
Hence, Illumina's Days Inventory for the
three
months ended in Mar. 2026 was 145.74.
The historical rank and industry rank for Illumina's Days Inventory or its related term are showing as below:
XSWX:ILMN'
s Days Inventory Range Over the Past 10 Years
Min: 106.81 Med: 126.7 Max: 142.3
Current: 141.43
During the past 13 years, Illumina's highest Days Inventory was 142.30. The lowest was 106.81. And the median was 126.70.
XSWX:ILMN's Days Inventory is ranked worse than 77.4% of 177
companies
in the Medical Diagnostics & Research industry
Industry Median: 70.8
vs XSWX:ILMN: 141.43
Illumina's Days Inventory
increased
from Mar. 2025 (138.78) to Mar. 2026 (145.74).
It might indicate that Illumina's sales slowed down.
Inventory Turnover measures how fast the company turns over its inventory within a year.
Illumina's Inventory Turnover for the
three
months ended in Mar. 2026 was 0.63.
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.
Illumina's Inventory-to-Revenue for the
three
months ended in Mar. 2026 was 0.54.
Illumina (XSWX:ILMN) 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.
Illumina's Inventory Turnover for the
three
months ended in Mar. 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.
Illumina's Inventory to Revenue for the
three
months ended in Mar. 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.
Illumina Days Inventory Related Terms
Illumina Days Inventory Historical Data
* Premium members only.
The historical data trend for Illumina'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.
XSWX:ILMN vs MTD, DGX, LH: Days Inventory Comparison
For the Diagnostics & Research subindustry, Illumina'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.
Illumina Days Inventory vs Medical Diagnostics & Research Industry
For the Medical Diagnostics & Research industry and Healthcare sector, Illumina's Days Inventory distribution charts can be found below:
* The bar in red indicates where Illumina'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.
Illumina (XSWX:ILMN) has a Days Inventory of 145.74 as of Mar. 2026. Days inventory represents the average amount of days a company holds inventory before selling it. View historical data on Illumina and its competitors. This is 15% above median its historical median of 126.70. Over the past decade, Illumina's Days Inventory has ranged from 106.81 to 142.30. According to the industry distribution chart, Illumina ranks #137 out of 177 companies in the Medical Diagnostics & Research industry, placing it in the top 77.4%.
Is Illumina's Days Inventory too high?
Illumina's current Days Inventory of 145.74 is 15% above median its 10-year median of 126.70. Over the past 10 years, this metric has ranged from a low of 106.81 to a high of 142.30. The Medical Diagnostics & Research industry median Days Inventory is 70.80. Illumina's value of 145.74 is 105.8% above this industry median. Based on the distribution chart, Illumina ranks #137 out of 177 companies in the Medical Diagnostics & Research industry, which is in the bottom quartile relative to peers. Overall, Illumina has a GF Score™ of 76/100, reflecting its overall financial health beyond just this single metric.
How does Illumina's Days Inventory compare to MTD and DGX?
According to the Medical Diagnostics & Research industry distribution chart, Illumina ranks #137 out of 177 companies for Days Inventory. This places Illumina in the lower half of its industry. The industry median Days Inventory is 70.80. Illumina's value of 145.74 is 105.8% above this benchmark. Historically, Illumina's own Days Inventory has ranged from 106.81 to 142.30 over the past decade. While the company's 10-year median is 126.70 vs. the industry median of 70.80, Illumina 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 Medical Diagnostics & Research company?
The median Days Inventory among Medical Diagnostics & Research companies is 70.80, based on 177 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. Illumina's current Days Inventory of 145.74 is 105.8% 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 Illumina and its competitors. For the Medical Diagnostics & Research industry, the median Days Inventory is 70.80 — values significantly above this may indicate overvaluation, while values below may suggest a bargain or underlying issues. Illumina's current Days Inventory is 145.74, which is 15% above median its own 10-year median of 126.70. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Illumina stock overvalued right now?
Illumina (XSWX:ILMN) has a current Days Inventory of 145.74. The stock's GF Value™ is CHF105.51, compared to a current price of CHF143.95 — trading 36.4% above its estimated fair value. The current Days Inventory is 145.74, which is 15% above median its 10-year median of 126.70 and 105.8% above the Medical Diagnostics & Research industry median of 70.80. Illumina's overall GF Score™ is 76/100 with 7 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 Illumina (XSWX:ILMN), the current Days Inventory is 145.74 as of Mar. 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 Illumina (XSWX:ILMN) Overvalued in 2026?
Based on GuruFocus' analysis, Illumina stock appears to be overvalued.
The current stock price of CHF143.95 is trading 36.4% above its estimated GF Value™ of CHF105.51.
Key valuation signals for XSWX:ILMN:
Days Inventory: 145.74 (15% above median its 10-year median of 126.70)
GF Value™: CHF105.51 vs. price of CHF143.95 (36.4% above fair value)
Industry Position: 105.8% above the Medical Diagnostics & Research median (#137 of 177)
No single metric tells the full story. See the XSWX:ILMN stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
Illumina provides tools and services to analyze genetic material with life science and clinical lab applications. The company generates over 90% of its revenue from sequencing instruments, consumables, and services. Illumina's high-throughput technology enables whole genome sequencing in humans and other large organisms. Its lower throughput tools enable applications that require smaller data outputs, such as viral and cancer tumor screening. Illumina also sells microarrays (9% of 2024 sales) that enable lower-cost, focused genetic screening with primarily consumer and agricultural applications.
76GF Score
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