Amphastar PharmaceuticalsAMPH +3.52%83 Days Inventory is 157.02 as of Mar. 2026, which is 1% above its 10-year median of 155.63. GuruFocus rates AMPH with a GF Score™ of 83/100 and a GF Value™ of $48.79 (Significantly Undervalued). The stock has 6 warning signs investors should review. Among 919 Drug Manufacturers companies, Amphastar Pharmaceuticals ranks worse than 54.62% on this metric.
Inventory Turnover measures how fast the company turns over its inventory within a year.
Amphastar Pharmaceuticals's Inventory Turnover for the
three
months ended in Mar. 2026 was 0.58.
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.
Amphastar Pharmaceuticals's Inventory-to-Revenue for the
three
months ended in Mar. 2026 was 1.01.
Amphastar Pharmaceuticals (NAS:AMPH) 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.
Amphastar Pharmaceuticals'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.
Amphastar Pharmaceuticals'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.
Amphastar Pharmaceuticals Days Inventory Related Terms
Amphastar Pharmaceuticals Days Inventory 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.
AMPH vs ETON, ESPR, BIOA: Days Inventory Comparison
For the Drug Manufacturers - Specialty & Generic subindustry, Amphastar Pharmaceuticals'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.
Amphastar Pharmaceuticals Days Inventory vs Drug Manufacturers Industry
For the Drug Manufacturers industry and Healthcare sector, Amphastar Pharmaceuticals's Days Inventory distribution charts can be found below:
* The bar in red indicates where Amphastar Pharmaceuticals'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.
Amphastar Pharmaceuticals (AMPH) has a Days Inventory of 157.02 as of Mar. 2026. Days inventory represents the average amount of days a company holds inventory before selling it. View historical data on Amphastar Pharmaceuticals and its competitors. This is near median its historical median of 155.63. Over the past decade, Amphastar Pharmaceuticals' Days Inventory has ranged from 129.26 to 183.23. According to the industry distribution chart, Amphastar Pharmaceuticals ranks #502 out of 919 companies in the Drug Manufacturers industry, placing it in the top 54.6%.
Is Amphastar Pharmaceuticals' Days Inventory too high?
Amphastar Pharmaceuticals' current Days Inventory of 157.02 is near median its 10-year median of 155.63. Over the past 10 years, this metric has ranged from a low of 129.26 to a high of 183.23. The Drug Manufacturers industry median Days Inventory is 162.83. Amphastar Pharmaceuticals' value of 157.02 is 3.6% below this industry median. Based on the distribution chart, Amphastar Pharmaceuticals ranks #502 out of 919 companies in the Drug Manufacturers industry, which is below the industry midpoint. Overall, Amphastar Pharmaceuticals has a GF Score™ of 83/100 and is considered Significantly Undervalued, reflecting its overall financial health beyond just this single metric.
How does Amphastar Pharmaceuticals' Days Inventory compare to ETON and ESPR?
According to the Drug Manufacturers industry distribution chart, Amphastar Pharmaceuticals ranks #502 out of 919 companies for Days Inventory. This places Amphastar Pharmaceuticals in the lower half of its industry. The industry median Days Inventory is 162.83. Amphastar Pharmaceuticals' value of 157.02 is 3.6% below this benchmark. Historically, Amphastar Pharmaceuticals' own Days Inventory has ranged from 129.26 to 183.23 over the past decade. While the company's 10-year median is 155.63 vs. the industry median of 162.83, Amphastar Pharmaceuticals 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 Drug Manufacturers company?
The median Days Inventory among Drug Manufacturers companies is 162.83, based on 919 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. Amphastar Pharmaceuticals's current Days Inventory of 157.02 is 3.6% 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 Amphastar Pharmaceuticals and its competitors. For the Drug Manufacturers industry, the median Days Inventory is 162.83 — values significantly above this may indicate overvaluation, while values below may suggest a bargain or underlying issues. Amphastar Pharmaceuticals's current Days Inventory is 157.02, which is near median its own 10-year median of 155.63. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Amphastar Pharmaceuticals stock overvalued right now?
Based on GuruFocus' analysis, Amphastar Pharmaceuticals (AMPH) is currently considered Significantly Undervalued. The stock's GF Value™ is $48.79, compared to a current price of $21.78 — trading 55.4% below its estimated fair value. The current Days Inventory is 157.02, which is near median its 10-year median of 155.63 and 3.6% below the Drug Manufacturers industry median of 162.83. Amphastar Pharmaceuticals' overall GF Score™ is 83/100 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 Amphastar Pharmaceuticals (AMPH), the current Days Inventory is 157.02 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 Amphastar Pharmaceuticals (AMPH) Overvalued in 2026?
Based on GuruFocus' analysis, Amphastar Pharmaceuticals stock appears to be undervalued.
The current stock price of $21.78 is trading 55.4% below its estimated GF Value™ of $48.79.
GuruFocus considers Amphastar Pharmaceuticals to be Significantly Undervalued.
Key valuation signals for AMPH:
Days Inventory: 157.02 (near median its 10-year median of 155.63)
GF Value™: $48.79 vs. price of $21.78 (55.4% below fair value)
Industry Position: 3.6% below the Drug Manufacturers median (#502 of 919)
No single metric tells the full story. See the AMPH stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
Amphastar Pharmaceuticals Inc is a bio-pharmaceutical company focusing on developing, manufacturing, marketing, and selling technically challenging generic and proprietary injectable, inhalation, and intranasal products, as well as insulin active pharmaceutical ingredient (or insulin API products. The company's finished products are used in hospital or urgent care clinical settings and are contracted and distributed through group purchasing organizations and drug wholesalers. The company has one reportable segment: pharmaceutical products. Geographically, the business presence of the firm is seen in the United States, China, and France, of which the U.S. accounts for the majority of the revenue.
83GF Score
Get the complete analysis for AMPH
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
AMPH has been successfully added to your 
