Onto InnovationONTO -5.90%85 Days Inventory is 192.55 as of Mar. 2026, which is 17% below its 10-year median of 233.28. GuruFocus rates ONTO with a GF Score™ of 85/100 and a GF Value™ of $189.26 (Significantly Overvalued). The stock has 6 warning signs investors should review. Among 981 Semiconductors companies, Onto Innovation ranks worse than 77.88% on this metric.
The historical rank and industry rank for Onto Innovation's Days Inventory or its related term are showing as below:
ONTO'
s Days Inventory Range Over the Past 10 Years
Min: 198.73 Med: 233.28 Max: 300.8
Current: 198.73
During the past 13 years, Onto Innovation's highest Days Inventory was 300.80. The lowest was 198.73. And the median was 233.28.
ONTO's Days Inventory is ranked worse than 77.88% of 981
companies
in the Semiconductors industry
Industry Median: 111.84
vs ONTO: 198.73
Onto Innovation's Days Inventory
declined
from Mar. 2025 (214.36) to Mar. 2026 (192.55).
Inventory Turnover measures how fast the company turns over its inventory within a year.
Onto Innovation's Inventory Turnover for the
three
months ended in Mar. 2026 was 0.47.
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.
Onto Innovation's Inventory-to-Revenue for the
three
months ended in Mar. 2026 was 1.05.
Onto Innovation (NYSE:ONTO) 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.
Onto Innovation'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.
Onto Innovation'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.
Onto Innovation Days Inventory Related Terms
Onto Innovation Days Inventory Historical Data
* Premium members only.
The historical data trend for Onto Innovation'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.
ONTO vs NVMI, FORM, AMKR: Days Inventory Comparison
For the Semiconductor Equipment & Materials subindustry, Onto Innovation'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.
Onto Innovation Days Inventory vs Semiconductors Industry
For the Semiconductors industry and Technology sector, Onto Innovation's Days Inventory distribution charts can be found below:
* The bar in red indicates where Onto Innovation'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.
Onto Innovation (ONTO) has a Days Inventory of 192.55 as of Mar. 2026. Days inventory represents the average amount of days a company holds inventory before selling it. View historical data on Onto Innovation and its competitors. This is 17% below median its historical median of 233.28. Over the past decade, Onto Innovation's Days Inventory has ranged from 198.73 to 300.80. According to the industry distribution chart, Onto Innovation ranks #764 out of 981 companies in the Semiconductors industry, placing it in the top 77.9%.
Is Onto Innovation's Days Inventory too high?
Onto Innovation's current Days Inventory of 192.55 is 17% below median its 10-year median of 233.28. Over the past 10 years, this metric has ranged from a low of 198.73 to a high of 300.80. The Semiconductors industry median Days Inventory is 111.84. Onto Innovation's value of 192.55 is 72.2% above this industry median. Based on the distribution chart, Onto Innovation ranks #764 out of 981 companies in the Semiconductors industry, which is in the bottom quartile relative to peers. Overall, Onto Innovation has a GF Score™ of 85/100 and is considered Significantly Overvalued, reflecting its overall financial health beyond just this single metric.
How does Onto Innovation's Days Inventory compare to NVMI and FORM?
According to the Semiconductors industry distribution chart, Onto Innovation ranks #764 out of 981 companies for Days Inventory. This places Onto Innovation in the lower half of its industry. The industry median Days Inventory is 111.84. Onto Innovation's value of 192.55 is 72.2% above this benchmark. Historically, Onto Innovation's own Days Inventory has ranged from 198.73 to 300.80 over the past decade. While the company's 10-year median is 233.28 vs. the industry median of 111.84, Onto Innovation 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 111.84, based on 981 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. Onto Innovation's current Days Inventory of 192.55 is 72.2% 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 Onto Innovation and its competitors. For the Semiconductors industry, the median Days Inventory is 111.84 — values significantly above this may indicate overvaluation, while values below may suggest a bargain or underlying issues. Onto Innovation's current Days Inventory is 192.55, which is 17% below median its own 10-year median of 233.28. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Onto Innovation stock overvalued right now?
Based on GuruFocus' analysis, Onto Innovation (ONTO) is currently considered Significantly Overvalued. The stock's GF Value™ is $189.26, compared to a current price of $323.92 — trading 71.2% above its estimated fair value. The current Days Inventory is 192.55, which is 17% below median its 10-year median of 233.28 and 72.2% above the Semiconductors industry median of 111.84. Onto Innovation's overall GF Score™ is 85/100 with 6 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 Onto Innovation (ONTO), the current Days Inventory is 192.55 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 Onto Innovation (ONTO) Overvalued in 2026?
Based on GuruFocus' analysis, Onto Innovation stock appears to be overvalued.
The current stock price of $323.92 is trading 71.2% above its estimated GF Value™ of $189.26.
GuruFocus considers Onto Innovation to be Significantly Overvalued.
Key valuation signals for ONTO:
Days Inventory: 192.55 (17% below median its 10-year median of 233.28)
GF Value™: $189.26 vs. price of $323.92 (71.2% above fair value)
Industry Position: 72.2% above the Semiconductors median (#764 of 981)
No single metric tells the full story. See the ONTO stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
Onto Innovation Inc is engaged in the design, development, manufacture, and support of high-performance control metrology, defect inspection, lithography, and data analysis systems used by microelectronics device manufacturers. The Company and its subsidiaries currently operate in a single operating segment. The company mainly operates in the United States, Southeast Asia, China, Japan, and Europe, with Taiwan and South Korea the sources of total revenue.
85GF Score
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