Amphastar Pharmaceuticals

AMPH on Nasdaq. Amphastar sells generic injectable, inhalation, and nasal medicines to hospitals and patients. Market value $1.1bn.

Watch this stockFree. We tell you when something changes.

Price checks use the past 12 months to June 2026. Quality checks use five annual reports, the latest for the year to December 2025.

Should I look at this?

Worth a closer look

Read what could go wrong

This is not advice. Check the numbers below.

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Cash yield
past 12 months to June 2026
13.9%very high

For every $100 of what the whole company costs, it produced $13.87 of spare cash in the past 12 months. A savings account pays about $4.

Price to profit
past 12 months to June 2026
13.0×fair

You pay 13.0 years of operating profit for the business. The average large US company costs around 18.

Return on capital
five annual reports to December 2025
13.8%five-year median

Each dollar kept in the business earns 14 cents a year. Above 10 is good.

Quality score: 98 of 100. Price score: 98 of 100. Our list needs 70 on quality and 60 on price.

$25.91 a share, 56% above its 1-year low

Over the past year the price has ranged from $16.65 to $29.52.

Pays no dividend

Prices from Tuesday’s close (6 October).

Five years of cash, in billions

0.1
0.1
0.1
0.2
0.1
0.2
2021202220232024202512 monthsto Jun '26
Revenue
$438m$499m$644m$732m$720m
Operating margin
16.0%21.5%30.6%28.1%19.5%
Debt to equity
0.180.150.940.840.79
Shares outstanding
0.05bn0.05bn0.05bn0.05bn0.04bn

Health checks

  • Free cash flow positive5 of 5 years
  • Accounting looks honest (Beneish)Nothing unusual
  • Financial strength (Piotroski)6 of 9
  • Profit backed by cash (accruals)Yes
  • Debt0.79× equity
  • Revenue growth, five yearsStrong, 15.5% a year
  • Buying back its own sharesYes, 12% fewer since 2021

The quarter to June 2026

How the business did, compared with the same quarter a year earlier.

  • Sales: $184 million last quarter, up 5% on a year ago.
  • Profit: $30 million, down 2% on a year ago.
  • It keeps 16 cents of each $1 of sales as operating profit, down from 25 cents a year earlier.
  • Spare cash over the past 12 months: $153 million, up from $112 million.
  • 8% fewer shares than a year ago. Each share owns a bit more of the company.
  • Debt is $388 million more than cash, down from $421 million a year ago.
  • Sales grew on a year ago in 3 of the last 4 quarters.
Sales by quarter
Sales by quarter
Quarter toAmount
September 2024$191m
December 2024$187m
March 2025$171m
June 2025$174m
September 2025$192m
December 2025$183m
March 2026$171m
June 2026$184m
Profit by quarter
Profit by quarter
Quarter toAmount
September 2024$40m
December 2024$38m
March 2025$25m
June 2025$31m
September 2025$17m
December 2025$24m
March 2026$6m
June 2026$30m

From the company's quarterly reports to the SEC.

Dates

Next results (estimated)
n/a
Last annual report (10-K)
26 February 2026
Next quarterly (estimated, 10-Q)
5 November 2026

Who owns it

4 long-term investors we follow own it, up from 3 last quarter. 210 funds in all.

Jun '25
Dec '25
Jun '26
Largest holders overall

From 13F filings for the quarter ended 30 June 2026.

Big holders and activists

3 investors own more than 5%.

From Schedule 13D and 13G filings: anyone owning more than 5% must file one.

What insiders did

No insider bought shares on the open market in the last 12 months. 4 sold $2m, $299,996 of it under preset trading plans.

  • PETERS WILLIAM J
    CFO, EVP & TREASURER, Director
    Sold
    under a preset trading plan
    Date
    21 September 2026
    Shares
    4,139
    Price
    $25.00
    Value
    $103,475
  • Zhou Rong
    SENIOR EVP, PRODUCTION CENTER
    Sold
    Date
    16 September 2026
    Shares
    10,000
    Price
    $23.94
    Value
    $239,404
  • Zhou Rong
    SENIOR EVP, PRODUCTION CENTER
    Sold
    Date
    2 September 2026
    Shares
    3,187
    Price
    $23.63
    Value
    $75,306
  • PRINS RICHARD K
    Director
    Sold
    Date
    11 August 2026
    Shares
    7,973
    Price
    $20.30
    Value
    $161,852
  • PETERS WILLIAM J
    CFO, EVP & TREASURER, Director
    Sold
    under a preset trading plan
    Date
    7 August 2026
    Shares
    8,180
    Price
    $22.48
    Value
    $183,886
  • Zhou Rong
    SENIOR EVP, PRODUCTION CENTER
    Sold
    Date
    17 December 2025
    Shares
    9,787
    Price
    $26.20
    Value
    $256,419
  • Petersen Floyd F.
    Director
    Sold
    Date
    12 December 2025
    Shares
    2,426
    Price
    $25.92
    Value
    $62,882
  • Petersen Floyd F.
    Director
    Sold
    Date
    11 December 2025
    Shares
    1,737
    Price
    $25.69
    Value
    $44,624
  • PRINS RICHARD K
    Director
    Sold
    Date
    25 November 2025
    Shares
    4,179
    Price
    $27.10
    Value
    $113,251
  • Petersen Floyd F.
    Director
    Sold
    Date
    13 November 2025
    Shares
    16,679
    Price
    $26.49
    Value
    $441,827

From Form 4 filings: insiders must report trades in their own company's shares within two days.

Warning signs in its filings

Problems the company itself reported to the SEC, in its own words.

None of the warning signs we check for were found.

We look for five warning signs: doubt it can keep going, weak checks on its own accounts, a notice that its past accounts can't be relied on, a change of auditor, and one customer bringing in a big share of sales. We don't check lawsuits, investigations or debt yet.

We checked the auditor's report, internal controls, restatement notices, auditor changes and big customers in the 10-K filed 26 Feb 2026, plus the 10-Q filed 6 Aug 2026 and 8 later 8-Ks.

A 10-K is the yearly report every US company files with the SEC. An 8-K is a short notice of a big event.

What could go wrong

Cheap for a reason is the question the numbers cannot answer.

Whether the price already reflects the risks is what the deep dive is for.

What changed in the risks this year

Companies must list what could hurt them each year. These are the parts that changed since last year’s report.

  • Complications with the design or implementation of our new enterprise resource planning system could adversely impact our business and operations.

    Could happen
    ​ We rely extensively on information systems and technology to manage our business and summarize operating results. We are in the process of a multi-year implementation of a new global enterprise resource planning (“ERP”) system. The ERP system is designed to accurately maintain the Company’s financial records, enhance operational functionality and provide timely information to the Company’s management team related to the operation of the business and is intended to replace our existing operating and financial systems. The ERP system implementation process has required, and will continue to require, the investment of significant personnel and financial resources. We may not be able to successfully implement the ERP system without experiencing delays, increased costs and other difficulties. If we are unable to successfully design and implement the new ERP system as planned, our financial positions, results of operations and cash flows could be negatively impacted. Additionally, if we do not effectively implement the ERP system as planned or the ERP system does not operate as intended, and accordingly, the effectiveness of our internal control over financial reporting could be adversely affected or our ability to assess those controls adequately could be further delayed.
    Read more
  • Complying with laws in the U.S., Europe, and other jurisdictions that impose restrictive regulations addressing the collection, use, and other processing of personal information may be expensive, and failure to comply with such laws and regulations could cause substantial harm to our business.

    Could happen
    Additionally, other jurisdictions are considering new or expanded laws or regulations relating to privacy, security and data protection. We expect laws, regulations, industry standards and other obligations worldwide relating to privacy, data protection, and cybersecurity to continue to evolve, and that there will continue to be new, modified, and re-interpreted laws, regulations, standards, and other obligations in these areas. For example, the Network and Information Security Directive II, or NIS2, adopted in 2023, aims to enhance cybersecurity across critical infrastructure and essential services in the EU. It expands the scope of the 2016 NIS Directive to include additional sectors while enforcing stricter governance and accountability requirements. NIS2 requires all 27 EU member states to issue implementing legislation by October 2024; however, several EU member states have not finalized their respective legislation and guidance.
    Read more
  • Enhanced trade tariffs, import restrictions, export restrictions, Chinese regulations or other trade barriers may materially harm our business.

    Could happen
    We are continuing to expand our international operations as part of our growth strategy. There is currently significant uncertainty about the future relationship between the United States and various other countries, most significantly China, with respect to trade policies, treaties, government regulations and tariffs. There is a possibility that the United States could continue to impose greater restrictions on international trade and significant increases in tariffs on goods imported into the United States. For example, since September 2018, the U.S. Trade Representative (the “USTR”) enacted Section 301 tariffs on certain commodities from certain U.S. trading partners, most prominently China and Brazil, affecting hundreds of billions of dollars of imports. In addition, between February 4, 2025 and February 23, 2026, the U.S. government imposed “fentanyl-related” tariffs of 10% to 35% on the import of almost all Chinese-, Mexican-, and Canadian-origin items with an exception for items qualifying for duty-free treatment under the U.S.-Mexico-Canada Agreement, as well as additional “reciprocal” tariffs of 10% to 125% on certain products of most other U.S. trading partners, including China, after April 2025, with exemptions for certain pharmaceutical products, semiconductors, and consumer electronics. Since March 2025, the U.S. government has also implemented new Section 232 tariffs of 10% to 50% on various commodities based on findings by the U.S. government that imports of these items threaten to impair U.S. national security, including with regard to imports of certain articles of steel and aluminum; passenger vehicles, trucks, and automotive components; certain articles of copper; and timber, lumber, and certain article of wood. Following a Supreme Court ruling on February 20, 2026, the U.S. government ceased collecting the fentanyl-related and reciprocal tariffs on February 24, 2026. On the same day, the U.S. government implemented a “temporary import surcharge” under authorities provided in Section 122 of the Trade Acts of 1974, currently set at 15% and scheduled to last for a period of 150 days. This temporary import surcharge, like the reciprocal tariffs preceding it, excludes certain items, including pharmaceutical products, certain electronics, and other items specified in Annexes to the President’s February 20, 2026 executive order “Imposing a Temporary Import Surcharge to Address Fundamental International Payments Problems.” These trade policies, including applicable items, tariff rates, countries, and exceptions, are subject to change. Additional tariffs may in the future also be implemented by the U.S. government (including on imports of pharmaceutical products into the United States, which are currently under Section 232 investigation by the U.S. Department of Commerce), the implementation, scope, and duration of which remain uncertain. Tariffs on imports of APIs and starting materials used in our products, or retaliatory trade measures taken by China or other countries, which could potentially include restricted access to APIs or starting materials used in our products, could result in us needing to raise prices, make changes to our products, or otherwise materially harm our business, financial condition and results of operations. Further, the continued threats of tariffs, trade restrictions, and trade barriers could have a generally disruptive impact on the global economy and, therefore, negatively impact our sales. Given the focus of the U.S. government on issues related to China, including the imposition of additional restrictions on exports related to semi-conductor manufacturing and supercomputing, the imposition of outbound investment controls affecting U.S. persons’ ability to invest in certain enterprises in China, and the addition of entities based in China to various restricted party lists, along with uncertainty regarding how the U.S. or foreign governments will act with respect to tariffs, internation
    Read more

Read it in the annual report

The deep dive

Everything above is arithmetic on public filings. The deep dive reads the last ten years of annual reports, the proxy statements, and the earnings calls, then argues the case the way Buffett, Klarman, and Hohn would, and checks every claim against the source.

  • What the business is worth, as a range, and the margin of safety at today’s price
  • Prices to start buying, buy, and buy hard
  • The three things that would make this a mistake
  • Every number footnoted to the filing it came from
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Not advice. Numbers on this page come from SEC filings and are updated each night; prices are updated again after the US market closes. The five-year figures are rounded.