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Richard Sloan from the University of Michigan was first to document what is referred to as the "accrual anomaly". His 1996 paper found that shares of companies with small or negative accruals vastly outperform (+10%) those of companies with large ones.
As of Mar. 2026, Amphastar Pharmaceuticals has a Sloan Ratio of 0.48%, indicating the company is in the safe zone and there is no funny business with accruals.
Amphastar Pharmaceuticals (NAS:AMPH) Sloan Ratio % Explanation
A former University of Michigan researcher, Richard Sloan's 1996 paper found that shares of companies with small or negative accruals vastly outperform (+10%) those of companies with large ones. In fact, for the 40-year period between 1962 and 2001, buying the lowest accrual companies and shorting the highest accrual companies resulted in an average annual compounded return of 18%, more than double the S&P 500's 7.4% annual return over the same period.
If the Sloan Ratio is between -10% and 10%, the company is in the safe zone and there is no funny business with accruals.
If the Sloan Ratio is less than between -25% and -10% on the negative side, and between 10% and 25% on the positive side, this is a warning stage of accrual build up.
If the Sloan Ratio is less than -25% or greater than 25%, and this ratio is consistent over several quarters or even years, be careful. Earnings are highly likely to be made up of accruals.
As of Mar. 2026, Amphastar Pharmaceuticals has a Sloan Ratio of 0.48%, indicating the company is in the safe zone and there is no funny business with accruals.
Amphastar Pharmaceuticals Sloan Ratio % Related Terms
Amphastar Pharmaceuticals Sloan Ratio % 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, PCRX, BIOA: Sloan Ratio % Comparison
For the Drug Manufacturers - Specialty & Generic subindustry, Amphastar Pharmaceuticals's Sloan Ratio %, along with its competitors' market caps and Sloan Ratio % 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 Sloan Ratio % vs Drug Manufacturers Industry
For the Drug Manufacturers industry and Healthcare sector, Amphastar Pharmaceuticals's Sloan Ratio % distribution charts can be found below:
* The bar in red indicates where Amphastar Pharmaceuticals's Sloan Ratio % falls into.
Amphastar Pharmaceuticals Sloan Ratio % Calculation
Earnings contain a lot of non cash earnings which is called accruals. The Sloan ratio is a way to identify firms with low non-cash or accrual-derived earnings relative to their cash flow.
Amphastar Pharmaceuticals's Sloan Ratio for the fiscal year that ended in Dec. 2025 is calculated as
Amphastar Pharmaceuticals's Net Income for the trailing twelve months (TTM) ended in Mar. 2026 was 31.03 (Jun. 2025 ) + 17.35 (Sep. 2025 ) + 24.429 (Dec. 2025 ) + 6.42 (Mar. 2026 ) = $79.2 Mil.
Amphastar Pharmaceuticals's Cash Flow from Operations for the trailing twelve months (TTM) ended in Mar. 2026 was 35.592 (Jun. 2025 ) + 52.583 (Sep. 2025 ) + 32.863 (Dec. 2025 ) + 47.84 (Mar. 2026 ) = $168.9 Mil.
Amphastar Pharmaceuticals's Cash Flow from Investing for the trailing twelve months (TTM) ended in Mar. 2026 was -0.625 (Jun. 2025 ) + -19.619 (Sep. 2025 ) + -60.569 (Dec. 2025 ) + -16.733 (Mar. 2026 ) = $-97.5 Mil.
* 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 Sloan Ratio % of 0.48% as of Mar. 2026. Sloan ratio measures earnings quality based on the amount of accruals. View historical data on Amphastar Pharmaceuticals and its competitors.
Is Amphastar Pharmaceuticals' Sloan Ratio % too high?
Amphastar Pharmaceuticals' current Sloan Ratio % is 0.48%. Overall, Amphastar Pharmaceuticals has a GF Score™ of 82/100 and is considered Significantly Undervalued, reflecting its overall financial health beyond just this single metric.
How does Amphastar Pharmaceuticals' Sloan Ratio % compare to ETON and PCRX?
Amphastar Pharmaceuticals' Sloan Ratio % of 0.48% can be compared against companies in the Drug Manufacturers industry. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good Sloan Ratio % for a Drug Manufacturers company?
A good Sloan Ratio % depends on the Drug Manufacturers industry context. However, Sloan Ratio % should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. Use the industry distribution chart on this page to see where any company falls relative to its peers.
What does a high Sloan Ratio % mean?
A high Sloan Ratio % can signal that a stock is expensive relative to its fundamentals. Sloan ratio measures earnings quality based on the amount of accruals. View historical data on Amphastar Pharmaceuticals and its competitors. Amphastar Pharmaceuticals's current Sloan Ratio % is 0.48%. 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 $48.94, compared to a current price of $19.75 — trading 59.7% below its estimated fair value. The current Sloan Ratio % is 0.48%. Amphastar Pharmaceuticals' overall GF Score™ is 82/100 with 4 warning signs to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is Sloan Ratio % calculated?
Sloan Ratio % is calculated from a company's financial statements. For Amphastar Pharmaceuticals (AMPH), the current Sloan Ratio % is 0.48% 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 $19.75 is trading 59.7% below its estimated GF Value™ of $48.94.
GuruFocus considers Amphastar Pharmaceuticals to be Significantly Undervalued.
Key valuation signals for AMPH:
Sloan Ratio %: 0.48%
GF Value™: $48.94 vs. price of $19.75 (59.7% below fair value)
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.
82GF Score
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