# EDGAR Filing Document

**Accession Number:** 0001297184
**File Stem:** 0001297184-26-000033
**Filing Date:** 2026-5
**Character Count:** 170422
**Document Hash:** d472135e49d3c1fa183be2fd58a53e4a
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001297184-26-000033.hdr.sgml**: 20260507

**ACCESSION NUMBER**: 0001297184-26-000033

**CONFORMED SUBMISSION TYPE**: 10-Q

**PUBLIC DOCUMENT COUNT**: 96

**CONFORMED PERIOD OF REPORT**: 20260331

**FILED AS OF DATE**: 20260507

**DATE AS OF CHANGE**: 20260507

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Amphastar Pharmaceuticals, Inc.
- **CENTRAL INDEX KEY:** 0001297184
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 330702205
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 10-Q
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-36509
- **FILM NUMBER:** 26954479

**BUSINESS ADDRESS:**
- **STREET 1:** 11570 SIXTH STREET
- **CITY:** RANCHO CUCAMONGA
- **STATE:** CA
- **ZIP:** 91730
- **BUSINESS PHONE:** 909-980-9484

**MAIL ADDRESS:**
- **STREET 1:** 11570 SIXTH STREET
- **CITY:** RANCHO CUCAMONGA
- **STATE:** CA
- **ZIP:** 91730

?xml version='1.0' encoding='ASCII'? Amphastar Pharmaceuticals, Inc._2026-03-31

[**Table of Contents**](#Toc)

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**Washington, D.C. 20549**

------

**FORM 10-Q**

⌧ **QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934** 

**FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2026**

**or**

☐ **TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934**

**For the transition period from &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;to &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**

**Commission file number 001-36509**

------

**AMPHASTAR PHARMACEUTICALS, INC.**

**(Exact name of Registrant as specified in its charter)**

------

---

| | |
|:---|:---|
| **Delaware** | **33-0702205** |
| **(State or other jurisdiction of**<br>**incorporation or organization)** | **(I.R.S. EmployerIdentification No.)** |

---

---

| | |
|:---|:---|
| **11570 6**<sup>th</sup> **Street** |  |
| **Rancho Cucamonga, CA** | **91730** |
| **(Address of principal executive offices)** | **(zip code)** |

---

**(909) 980-9484**

**(Registrant's telephone number, including area code)**

------

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.&nbsp;&nbsp;&nbsp;&nbsp;Yes ☒&nbsp;&nbsp;&nbsp;&nbsp;No ☐&nbsp;&nbsp;&nbsp;&nbsp;

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).&nbsp;&nbsp;&nbsp;&nbsp;Yes ☒&nbsp;&nbsp;&nbsp;&nbsp;No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act.

---

| | | | |
|:---|:---|:---|:---|
| Large accelerated filer | ⌧ | Accelerated filer | ☐ |
| Non-accelerated filer | ☐  | Smaller reporting company | ☐ |
|  |  | Emerging growth company | ☐ |

---

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).&nbsp;&nbsp;&nbsp;&nbsp;Yes ☐&nbsp;&nbsp;&nbsp;&nbsp;No ⌧

Securities registered pursuant to Section 12(b) of the Act:

---

| | | |
|:---|:---|:---|
| T<br>|  |  |
| Title of each class | Trading Symbol(s) | Name of each exchange on which registered |
| Common Stock, par value $0.0001 per share | AMPH | The NASDAQ Stock Market LLC |

---

The number of shares outstanding of the registrant's only class of common stock as of May 1, 2026 was 44,092,919.

------

[**Table of Contents**](#Toc)

**AMPHASTAR PHARMACEUTICALS, INC.**

**TABLE OF CONTENTS**

**FORM 10-Q FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2026**

[**Special Note About Forward-Looking Statements**](#SPECIALNOTEABOUTFORWARDLOOKINGSTATEMENTS)

---

| | |
|:---|:---|
| [**Part I. FINANCIAL INFORMATION**](#PARTIFINANCIALINFORMATION_842261) | [**Part I. FINANCIAL INFORMATION**](#PARTIFINANCIALINFORMATION_842261) |
|  | **PAGE** |
| [Item 1. Financial Statements (unaudited)](#PARTIFINANCIALINFORMATION_842261) |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[Condensed Consolidated Balance Sheets as of March 31, 2026 and December 31, 2025](#BALANCESHEETS_900929) | 1 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[Condensed Consolidated Statements of Operations for the Three Months Ended March 31, 2026 and 2025](#STATEMENTSOFOPERATIONS_225780) | 2 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[Condensed Consolidated Statements of Comprehensive Income for the Three Months Ended March 31, 2026 and 2025](#STATEMENTOFCOMPREHENSIVE) | 3 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[Condensed Consolidated Statements of Stockholders' Equity for the Three Months Ended March 31, 2026 and 2025](#statmentofstockholdersequty) | 4 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[Condensed Consolidated Statements of Cash Flows for the Three Months Ended March 31, 2026 and 2025](#STATEMENTSOFCASHFLOWS_949590) | 5 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[Notes to Condensed Consolidated Financial Statements](#a1General_881540) | 6 |
| [Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations](#MANAGEMENTSDISCUSSION_909756) | 32 |
| [Item 3. Quantitative and Qualitative Disclosure about Market Risk](#QUANTITATIVEANDQUALITATIVE_629294) | 38 |
| [Item 4. Controls and Procedures](#CONTROLSANDPROCEDURES_497814) | 38 |
| [**Part II. OTHER INFORMATION**](#PARTIIOTHERINFORMATION_777957) | [**Part II. OTHER INFORMATION**](#PARTIIOTHERINFORMATION_777957) |
| [Item 1. Legal Proceedings](#PARTIIOTHERINFORMATION_777957) | 39 |
| [Item 1A. Risk Factors](#RISKFACTORS_807846) | 39 |
| [Item 2. Unregistered Sales of Equity Securities and Use of Proceeds](#UNREGISTEREDSALESOFEQUITY_46548) | 40 |
| [Item 3. Defaults Upon Senior Securities](#DEFAULTSUPONSENIORSECURITIES_420637) | 40 |
| [Item 4. Mine Safety Disclosures](#MINESAFETYDISCLOSURES_480820) | 40 |
| [Item 5. Other Information](#OTHERINFORMATION_642296) | 40 |
| [Item 6. Exhibits](#EXHIBITS_931718) | 42 |
| [Signatures](#SIGNATURES_138039) | 43 |

---

[**Table of Contents**](#Toc)

**SPECIAL NOTE ABOUT FORWARD-LOOKING STATEMENTS**

This Quarterly Report on Form 10-Q, or Quarterly Report, contains "forward-looking statements" that involve substantial risks and uncertainties. In some cases, you can identify forward-looking statements by the following words: "may," "might," "will," "could," "would," "should," "expect," "intend," "plan," "anticipate," "believe," "estimate," "predict," "project," "potential," "continue," "ongoing" or the negative of these terms or other comparable terminology, although not all forward-looking statements contain these identifying words. Forward-looking statements relate to future events or future financial performance or condition and involve known and unknown risks, uncertainties and other factors that could cause actual results, levels of activity, performance or achievement to differ materially from those expressed or implied by the forward-looking statements. These forward-looking statements include, but are not limited to, statements about:

● our expectations regarding the sales and marketing of our products;

● our expectations regarding our manufacturing and production and the integrity of our supply chain for our products, including the risks associated with our single source suppliers;

● our business and operations in general, including: adverse impacts of global conflicts and challenging macroeconomic conditions and market uncertainty on our business, financial condition, operations, cash flows and liquidity;

● our ability to attract, hire, and retain highly skilled personnel;

● interruptions to our manufacturing and production as a result of natural catastrophic events or other causes beyond our control such as power disruptions, pandemics, wars, terrorist attacks or other events;

● the timing and likelihood of U.S. Food and Drug Administration, or the FDA, approvals and regulatory actions on our product candidates, manufacturing activities and product marketing activities;

● our ability to advance product candidates in our platforms into successful and completed clinical trials and our subsequent ability to successfully commercialize our product candidates;

● cost and delays resulting from the extensive pharmaceutical regulations to which we are subject;

● our ability to compete in the development and marketing of our products and product candidates;

● our expectations regarding the business of our Chinese subsidiary;

● the potential for adverse application of environmental, health and safety and other laws and regulations on our operations;

● our expectations for market acceptance of our new products and proprietary drug delivery technologies, as well as those of our active pharmaceutical ingredient, or API, customers;

● the effects of reforms in healthcare regulations and reductions in pharmaceutical pricing, reimbursement and coverage;

● our expectations in obtaining insurance coverage and adequate reimbursement for our products from third-party payers;

● the amount of price concessions or exclusion of suppliers adversely affecting our business;

● variations in intellectual property laws, our ability to establish and maintain intellectual property protection for our products and our ability to successfully defend our intellectual property in cases of alleged infringement;

● the implementation of our business strategies, product development strategies and technology utilization;

● the potential for exposure to product liability claims;

● our ability to successfully bid for suitable acquisition targets or licensing opportunities, or to consummate and integrate acquisitions, divestitures or investments, including the anticipated benefits of such acquisitions, divestitures or investments;

● our ability to expand internationally;

● economic and industry trends and trend analysis;

● our ability to remain in compliance with laws and regulations that currently apply or become applicable to our business both in the United States and internationally;

● the impact of trade tariffs, export or import restrictions, or other trade barriers;

● the impact of the Patient Protection and Affordable Care Act (as amended) and other legislative and regulatory healthcare reforms in the countries in which we operate including the potential for drug price controls;

● the impact of global and domestic tax reforms;

● the timing for completion and the validation of the new construction at our facilities;

● the timing and extent of share buybacks; and

● our financial performance expectations, including our expectations regarding our backlog, revenue, cost of revenue, gross profit or gross margin, operating expenses, including changes in research and development, sales and marketing and general and administrative expenses, and our ability to achieve and maintain future profitability.

[**Table of Contents**](#Toc)

You should read this Quarterly Report and the documents that we reference elsewhere in this Quarterly Report completely and with the understanding that our actual results may differ materially from what we expect as expressed or implied by our forward-looking statements. In light of the significant risks and uncertainties to which our forward-looking statements are subject, you should not place undue reliance on or regard these statements as a representation or warranty by us or any other person that we will achieve our objectives and plans in any specified timeframe, or at all. We discuss many of these risks and uncertainties in greater detail in this Quarterly Report and in our Annual Report on Form 10-K for the year ended December 31, 2025, particularly in Item 1A. "Risk Factors." These forward-looking statements represent our estimates and assumptions only as of the date of this Quarterly Report regardless of the time of delivery of this Quarterly Report, and such information may be limited or incomplete, and our statements should not be read to indicate that we have conducted an exhaustive inquiry into, or review of, all potentially available relevant information. Except as required by law, we undertake no obligation to update or revise publicly any forward-looking statements, whether as a result of new information, future events or otherwise after the date of this Quarterly Report.

Unless expressly indicated or the context requires otherwise, references in this Quarterly Report to "Amphastar," "the Company," "we," "our," and "us" refer to Amphastar Pharmaceuticals, Inc. and our subsidiaries.

[**Table of Contents**](#Toc)

**PART I – FINANCIAL INFORMATION**

**ITEM 1. FINANCIAL STATEMENTS**

**AMPHASTAR PHARMACEUTICALS, INC.**

**CONDENSED CONSOLIDATED BALANCE SHEETS**

**(in thousands, except share data)**

---

| | | |
|:---|:---|:---|
|  | **March 31,** <br>**2026** | **December 31,** <br>**2025** |
|  | **(unaudited)** |  |
| **ASSETS** |  |  |
| Current assets: |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Cash and cash equivalents | $170939 | $170177 |
| &nbsp;&nbsp;&nbsp;&nbsp;Restricted cash | 235 | 235 |
| &nbsp;&nbsp;&nbsp;&nbsp;Short-term investments | 121012 | 112635 |
| &nbsp;&nbsp;&nbsp;&nbsp;Restricted short-term investments | 2200 | 2200 |
| &nbsp;&nbsp;&nbsp;&nbsp;Accounts receivable, net | 147848 | 143560 |
| &nbsp;&nbsp;&nbsp;&nbsp;Inventories | 170194 | 176890 |
| &nbsp;&nbsp;&nbsp;&nbsp;Income tax refunds and deposits | 9605 | 17167 |
| &nbsp;&nbsp;&nbsp;&nbsp;Prepaid expenses and other assets | 11650 | 13152 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total current assets | 633683 | 636016 |
| Property, plant, and equipment, net | 307231 | 310567 |
| Finance lease right-of-use assets | 185 | 221 |
| Operating lease right-of-use assets | 71496 | 42931 |
| Goodwill and intangible assets, net | 559623 | 565965 |
| Other assets | 33480 | 31135 |
| Deferred tax assets | 42464 | 42464 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total assets | $1648162 | $1629299 |
| **LIABILITIES AND STOCKHOLDERS' EQUITY** |  |  |
| Current liabilities: |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Accounts payable and accrued liabilities | $152688 | $148348 |
| &nbsp;&nbsp;&nbsp;&nbsp;Income taxes payable | 414 | 239 |
| &nbsp;&nbsp;&nbsp;&nbsp;Current portion of long-term debt | 1671 | 1641 |
| &nbsp;&nbsp;&nbsp;&nbsp;Current portion of operating lease liabilities | 9705 | 7928 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total current liabilities | 164478 | 158156 |
| Long-term reserve for income tax liabilities | 5926 | 5926 |
| Long-term debt, net of current portion and unamortized debt issuance costs | 609801 | 608749 |
| Long-term operating lease liabilities, net of current portion | 65201 | 37684 |
| Other long-term liabilities | 29365 | 29979 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total liabilities | 874771 | 840494 |
| Commitments and contingencies (see Note 17) |  |  |
| Stockholders' equity: |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Preferred stock: par value $0.0001; 20,000,000 shares authorized; no shares issued and outstanding |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Common stock: par value $0.0001; 300,000,000 shares authorized; 62,134,449 and 44,636,846 shares issued and outstanding, respectively, as of March 31, 2026 and 61,779,883 and 45,645,497 shares issued and outstanding, respectively, as of December 31, 2025 | 6 | 6 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Additional paid-in capital | 543816 | 535380 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Retained earnings | 673301 | 666881 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Accumulated other comprehensive loss | (5736) | (5314) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Treasury stock | (437996) | (408148) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total stockholders' equity | 773391 | 788805 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total liabilities and stockholders' equity | $1648162 | $1629299 |

---

*See Accompanying Notes to Condensed Consolidated Financial Statements.*

*-1-*

[**Table of Contents**](#Toc)

**AMPHASTAR PHARMACEUTICALS, INC.**

**CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS**

**(Unaudited; in thousands, except per share data)**

---

| | | |
|:---|:---|:---|
|  | **Three Months Ended**  | **Three Months Ended**  |
|  | **March 31,**  | **March 31,**  |
|  | **2026** | **2025** |
| Net revenues | $171171 | $170528 |
| Cost of revenues | 100849 | 85277 |
| Gross profit | 70322 | 85251 |
| Operating expenses: |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Selling, distribution, and marketing | 11927 | 11866 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;General and administrative | 18028 | 15996 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Research and development | 26737 | 20096 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total operating expenses | 56692 | 47958 |
| Income from operations | 13630 | 37293 |
| Non-operating expenses: |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Interest income | 2400 | 2089 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Interest expense | (6553) | (6286) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Other income (expenses), net | 575 | (2234) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total non-operating expenses, net | (3578) | (6431) |
| Income before income taxes | 10052 | 30862 |
| Income tax provision | 3632 | 5577 |
| Net income | $6420 | $25285 |
| Net income per share: |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Basic | $0.14 | $0.53 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Diluted | $0.14 | $0.51 |
| Weighted-average shares used to compute net income per share: |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Basic | 45322 | 47641 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Diluted | 46458 | 49890 |

---

*See Accompanying Notes to Condensed Consolidated Financial Statements.*

*-2-*

[**Table of Contents**](#Toc)

**AMPHASTAR PHARMACEUTICALS, INC.**

**CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME**

 **(Unaudited; in thousands)**

---

| | | |
|:---|:---|:---|
|  | **Three Months Ended**  | **Three Months Ended**  |
|  | **March 31,**  | **March 31,**  |
|  | **2026** | **2025** |
| Net income | $6420 | $25285 |
| Other comprehensive income (loss), net of income taxes |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Foreign currency translation adjustment | (812) | 1212 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Change in pension obligations | 390 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total other comprehensive income (loss) | (422) | 1212 |
| Total comprehensive income | $5998 | $26497 |

---

*See Accompanying Notes to Condensed Consolidated Financial Statements.*

*-3-*

[**Table of Contents**](#Toc)

**AMPHASTAR PHARMACEUTICALS, INC.**

**CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY**

 **(Unaudited; in thousands, except share data)**

---

| | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|
|  | **Common Stock** | **Common Stock** | | | | **Treasury Stock** | **Treasury Stock** | |
|  | <br>**Shares** | <br>**Amount** | <br>**Additional**<br>**Paid-in**<br>**Capital** | <br>**Retained**<br>**Earnings** | **Accumulated**<br>**Other**<br>**Comprehensive**<br>**Loss** | <br>**Shares** | <br>**Amount** | <br>**Total** |
| Balance as of December 31, 2025 | 61779883 | $6 | $535380 | $666881 | $(5314) | (16134386) | $(408148) | 788805 |
| &nbsp;&nbsp;&nbsp;&nbsp;Net income |  |  |  | 6420 |  |  |  | 6420 |
| &nbsp;&nbsp;&nbsp;&nbsp;Other comprehensive loss |  |  |  |  | (422) |  |  | (422) |
| &nbsp;&nbsp;&nbsp;&nbsp;Purchase of treasury stock |  |  |  |  |  | (1373345) | (30000) | (30000) |
| &nbsp;&nbsp;&nbsp;&nbsp;Issuance of treasury stock in connection with the Company's equity plans |  |  | (152) |  |  | 10128 | 152 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Issuance of common stock in connection with the Company's equity plans | 354566 |  | (686) |  |  |  |  | (686) |
| &nbsp;&nbsp;&nbsp;&nbsp;Share-based compensation expense |  |  | 9274 |  |  |  |  | 9274 |
| Balance as of March 31, 2026 | 62134449 | $6 | $543816 | $673301 | $(5736) | (17497603) | $(437996) | $773391 |

---

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| | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|
|  | **Common Stock** | **Common Stock** | | | | **Treasury Stock** | **Treasury Stock** | |
|  | <br>**Shares** | <br>**Amount** | <br>**Additional**<br>**Paid-in**<br>**Capital** | <br>**Retained**<br>**Earnings** | **Accumulated**<br>**Other**<br>**Comprehensive**<br>**Loss** | <br>**Shares** | <br>**Amount** | <br>**Total** |
| Balance as of December 31, 2024 | 60847124 | $6 | $505400 | $568787 | $(9181) | (13229433) | $(332714) | 732298 |
| &nbsp;&nbsp;&nbsp;&nbsp;Net income |  |  |  | 25285 |  |  |  | 25285 |
| &nbsp;&nbsp;&nbsp;&nbsp;Other comprehensive income |  |  |  |  | 1212 |  |  | 1212 |
| &nbsp;&nbsp;&nbsp;&nbsp;Purchase of treasury stock |  |  |  |  |  | (393836) | (11219) | (11219) |
| &nbsp;&nbsp;&nbsp;&nbsp;Issuance of common stock in connection with the Company's equity plans | 446322 |  | (4685) |  |  |  |  | (4685) |
| &nbsp;&nbsp;&nbsp;&nbsp;Share-based compensation expense |  |  | 8393 |  |  |  |  | 8393 |
| Balance as of March 31, 2025 | 61293446 | $6 | $509108 | $594071 | $(7969) | (13623269) | $(343933) | $751283 |

---

*See Accompanying Notes to Condensed Consolidated Financial Statements*

*-4-*

[**Table of Contents**](#Toc)

**AMPHASTAR PHARMACEUTICALS, INC.**

**CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS**

**(Unaudited; in thousands)**

---

| | | |
|:---|:---|:---|
|  | **Three Months Ended**  | **Three Months Ended**  |
|  | **March 31,**  | **March 31,**  |
|  | **2026** | **2025** |
| **Cash Flows From Operating Activities:** |  |  |
| Net income | $6420 | $25285 |
| Reconciliation to net cash provided by operating activities: |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Loss on disposal of assets | 4 | 2 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(Gain) loss on interest rate swaps and foreign currency transactions, net | (416) | 2142 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Depreciation of property, plant, and equipment | 8078 | 7369 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Amortization of intangible assets | 6270 | 6240 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Operating lease right-of-use asset amortization | 2144 | 1598 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Amortization of discounts, premiums, and debt issuance costs | 761 | 762 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Share-based compensation expense | 9274 | 8393 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Changes in operating assets and liabilities: |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Accounts receivable, net | (4547) | (8075) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Inventories | 6248 | (31111) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Prepaid expenses and other assets | (2326) | (849) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Income tax refunds, deposits, and payable, net | 7742 | 6470 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Operating lease liabilities | (1415) | (754) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Accounts payable and accrued liabilities | 9603 | 17605 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net cash provided by operating activities | 47840 | 35077 |
| **Cash Flows From Investing Activities:** |  |  |
| Purchases and construction of property, plant, and equipment | (9507) | (10697) |
| Purchase of investments | (22795) | (7092) |
| Maturity of investments | 15502 | 28288 |
| Deposits and other assets | 67 | (18) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net cash (used in) provided by investing activities | (16733) | 10481 |
| **Cash Flows From Financing Activities:** |  |  |
| Proceeds from equity plans, net of withholding tax payments | (686) | (4685) |
| Purchase of treasury stock | (29492) | (11000) |
| Debt issuance costs |  | (422) |
| Proceeds from borrowing under lines of credit |  | 1642 |
| Principal payments on long-term debt | (29) | (38) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net cash used in financing activities | (30207) | (14503) |
| Effect of exchange rate changes on cash | (138) | 118 |
| Net increase in cash, cash equivalents, and restricted cash | 762 | 31173 |
| Cash, cash equivalents, and restricted cash at beginning of period | 170412 | 151844 |
| Cash, cash equivalents, and restricted cash at end of period | $171174 | $183017 |
| **Noncash Investing and Financing Activities:** |  |  |
| Capital expenditures included in accounts payable | $4174 | $7218 |
| Operating lease right-of-use assets in exchange for operating lease liabilities | $30709 | $521 |
| **Supplemental Disclosures of Cash Flow Information:** |  |  |
| Interest paid, net of capitalized interest | $7295 | $7582 |
| Income taxes refunded | $(4111) | $(902) |

---

*See Accompanying Notes to Condensed Consolidated Financial Statements.*

*-5-*

**AMPHASTAR PHARMACEUTICALS, INC.**

**NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS**

**(Unaudited)**

[**Table of Contents**](#Toc)

**Note 1. General**

Amphastar Pharmaceuticals, Inc., a Delaware corporation (together with its subsidiaries, hereinafter referred to as the "Company"), is a biopharmaceutical company that focuses on developing, manufacturing, and commercializing technically challenging generic and proprietary injectable, inhalation, and intranasal products, including products with high technical barriers to market entry. Additionally, the Company sells active pharmaceutical ingredient, or API, products. Most of the Company's products are contracted and distributed through group purchasing organizations, drug wholesalers, and drug retailers. The Company's insulin API products are sold to other pharmaceutical companies for use in their own products and are being used by the Company in the development of injectable pharmaceutical products.

The unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements of the Company for the year ended December 31, 2025 and the notes thereto as filed with the Securities and Exchange Commission, or SEC, in the Company's Annual Report on Form 10-K for the year ended December 31, 2025. Certain information and footnote disclosures normally included in annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America, or GAAP, have been condensed or omitted from the accompanying condensed consolidated financial statements. The accompanying year-end condensed consolidated balance sheet was derived from the audited financial statements. The accompanying interim financial statements are unaudited, but reflect all adjustments which are, in the opinion of management, necessary for a fair presentation of the Company's consolidated financial position, results of operations, comprehensive income, stockholders' equity, and cash flows for the periods presented. Unless otherwise noted, all such adjustments are of a normal, recurring nature. The Company's results of operations, comprehensive income and cash flows for the interim periods are not necessarily indicative of the results of operations and cash flows that it may achieve in future periods.

**Note 2. Summary of Significant Accounting Policies**

*Basis of Presentation*

The unaudited condensed consolidated financial statements include the accounts of the Company and its subsidiaries, and are prepared in accordance with GAAP. All intercompany activity has been eliminated in the preparation of the condensed consolidated financial statements. In the opinion of management, the accompanying unaudited condensed consolidated financial statements include all adjustments, which are of a normal recurring nature, necessary to present fairly the consolidated financial position, results of operations, and cash flows of the Company.

*Use of Estimates*

The preparation of the condensed consolidated financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. Actual results could differ from those estimates. The principal accounting estimates include: fair value of financial instruments, allowance for credit losses, discounts, chargebacks and rebates, product returns, adjustment of inventory to its net realizable value, impairment of investments, long-lived and intangible assets and goodwill, litigation reserves, stock price volatility for share-based compensation expense, valuation allowances for deferred tax assets, and liabilities for uncertain income tax positions.

*Foreign Currency* 

The Company's condensed consolidated financial statements are presented in U.S. dollars. The functional currency for most of the Company's foreign subsidiaries are in their local currency. Revenues, expenses, gains and losses for non-U.S. dollar functional currency entities are translated into U.S. dollars using average currency exchange rates for the period. Assets and liabilities for such entities are translated using exchange rates that approximate the rate at the balance sheet date. Foreign currency translation adjustments are recorded as a component of accumulated other comprehensive

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**AMPHASTAR PHARMACEUTICALS, INC.**

**NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS**

**(Unaudited)**

[**Table of Contents**](#Toc)

loss on the Company's condensed consolidated balance sheets. Foreign currency transaction gains and losses on transactions not denominated in functional currency are recorded in Other (income) expenses, net, in the Company's condensed consolidated statements of operations.

The unrealized gains or losses of intercompany foreign currency transactions that are of a long-term investment nature are reported in other accumulated comprehensive income. The unrealized gains and losses of intercompany foreign currency transactions that are of a long-term investment nature for the three months ended March 31, 2026 and 2025 were a $0.8 million loss and a $1.2 million gain, respectively.

*Comprehensive Income*

The Company's comprehensive income includes its foreign currency translation gains and losses and change in pension obligations.

*Advertising Expense*

Advertising expenses, primarily associated with Primatene MIST<sup>®</sup>, are recorded as they are incurred, except for expenses related to the development of a major commercial or media campaign, which are expensed in the period in which the commercial or campaign is first presented, and are reflected as a component of selling, distribution and marketing in the Company's condensed consolidated statements of operations. For the three months ended March 31, 2026 and 2025, advertising expenses were $2.5 million and $3.0 million, respectively.

*Research and Development Costs* 

Research and development costs are charged to expense as incurred and consist of costs incurred to further the Company's research and development activities. These include salaries and related employee benefits, costs associated with clinical trials, nonclinical research and development activities, regulatory activities, license fees, milestone payments upon the achievement of clinical, or regulatory events, materials, supplies, research-related overhead expenses and fees paid to external service providers.

The Company has entered into, and may continue to enter into, license agreements to access and utilize certain technology. In each case, the Company evaluates if the license agreement results in the acquisition of an asset or a business. To date, none of the Company's license agreements have been considered an acquisition of a business. For asset acquisitions, the upfront payments to acquire such licenses, as well as any future milestone payments made before product approval that do not meet the definition of a derivative, are immediately recognized as research and development expense in the Company's condensed consolidated statements of operations when paid or become payable, provided there is no alternative future use of rights in other research and development projects.

*Financial Instruments*

The Company's accompanying condensed consolidated balance sheets include the following financial instruments: cash and cash equivalents, restricted cash, accounts receivable, accounts payable, accrued liabilities, short-term borrowings, and long-term obligations. The Company considers the carrying amounts of current assets and liabilities on the condensed consolidated balance sheets to approximate the fair value of these financial instruments due to the short maturity of these items. The carrying value of the Company's long-term obligations, with the exception of the convertible debt (See Note 13), approximates their fair value, as the stated borrowing rates are comparable to rates currently offered to the Company for instruments with similar maturities. The Company at times enters into interest rate swap contracts to manage its exposure to interest rate changes and its overall cost of long-term debt. The Company's interest rate swap contracts exchange the variable interest rates for fixed interest rates.

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**AMPHASTAR PHARMACEUTICALS, INC.**

**NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS**

**(Unaudited)**

[**Table of Contents**](#Toc)

*Cash and Cash Equivalents*

Cash and cash equivalents consist of cash, money market accounts, certificates of deposit and highly liquid investments with original maturities of three months or less.

*Investments*

Investments as of March 31, 2026 and December 31, 2025 consisted of certificates of deposit and investment grade corporate, agency and municipal bonds with original maturity dates between three and thirty-six months.

*Restricted Cash* 

Restricted cash is collateral required for the Company to guarantee certain vendor payments in France. As of March 31, 2026 and December 31, 2025, the restricted cash balance was $0.2 million.

*Restricted Short-Term Investments*

Restricted short-term investments consist of certificates of deposit that are collateral for standby letters of credit to qualify for workers' compensation self-insurance. The certificates of deposit have original maturities greater than three months, but less than one year. As of March 31, 2026 and December 31, 2025, the balance of restricted short-term investments was $2.2 million.

*Deferred Income Taxes*

The Company utilizes the liability method of accounting for income taxes, under which deferred taxes are determined based on the temporary differences between the financial statements and the tax basis of assets and liabilities using enacted tax rates. A valuation allowance is recorded when it is more likely than not that the deferred tax assets will not be realized.

*Debt Issuance Costs*

Debt issuance costs related to non-revolving debt are recognized as a reduction to the related debt balance in the accompanying condensed consolidated balance sheets and amortized to interest expense over the contractual term of the related debt using the effective interest method. Debt issuance costs associated with revolving debt are capitalized within other long-term assets on the condensed consolidated balance sheets and are amortized to interest expense over the term of the related revolving debt.

*Convertible Debt*

The Company accounts for its convertible debt instruments as a single unit of account, a liability, because the Company concluded that the conversion features do not require bifurcation as a derivative under Accounting Standards Codification, or ASC, 815-15, *Derivatives and Hedging* and the Company did not issue its convertible debt instruments at a substantial premium.

In accordance with Accounting Standards Update, or ASU, 2020-06, *Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity's Own Equity (Subtopic 815-40)*: *Accounting for Convertible Instruments and Contracts in an Entity's Own Equity*, the Company evaluates convertible debt instruments to determine if the conversion feature is freestanding or embedded. If the conversion feature does not require derivative treatment under ASC 815, the instrument is evaluated under ASC 470-20, "*Debt with Conversion and Other Options"* for consideration of any beneficial conversion features. If no beneficial conversion features exist that require separate

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**AMPHASTAR PHARMACEUTICALS, INC.**

**NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS**

**(Unaudited)**

[**Table of Contents**](#Toc)

recognition, convertible debt instruments are accounted for as a single liability measured at its amortized cost as long as no other features require separation and recognition as derivatives.

*Capitalized Software Implementation Costs*

The Company capitalizes certain software implementation costs incurred under a cloud computing arrangement that is a service contract. Costs incurred during the preliminary project phase or planning and research phase are expensed as incurred. Costs incurred during the application development stage related to the implementation of the hosting arrangement are capitalized and included within other assets on the accompanying condensed consolidated balance sheets. Capitalized implementation costs are amortized on a straight-line basis over the term of the associated hosting arrangement, when ready for its intended use. Capitalized implementation costs were $9.1 million and $6.8 million as of March 31, 2026 and December 31, 2025, respectively, and are included in other long-term assets in the Company's condensed consolidated balance sheets. For the three months ended March 31, 2026 and 2025, the Company did not record any amortization expense for capitalized implementation costs.

*Litigation, Commitments and Contingencies*

Litigation, commitments and contingencies are accrued when management, after considering the facts and circumstances of each matter as then known, has determined it is probable a liability will be found to have been incurred and the amount of the loss can be reasonably estimated. When only a range of amounts is reasonably estimable and no amount within the range is more likely than another, the low end of the range is recorded. Legal fees are expensed as incurred. Due to the inherent uncertainties surrounding gain contingencies, the Company generally does not recognize potential gains until they are realized.

*Recent Accounting Pronouncements*

In November 2024, the Financial Accounting Standard Board, or FASB, issued ASU 2024-03, *Income Statement Reporting-Comprehensive Income-Expense Disaggregation Disclosures (Subtopic 220-40), Disaggregation of Income Statement Expenses.* The standard update improves the disclosures about a public business entity's expenses by requiring more detailed information about the types of expenses (including purchases of inventory, employee compensation, depreciation and amortization) included within income statement expense captions. The guidance will be effective for annual reporting periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027. Early adoption is permitted. The standard updates are to be applied prospectively with the option for retrospective application. The Company is currently evaluating the impact of disclosure requirements related to the new standard on the Company's condensed consolidated financial statements and related disclosures.

In November 2024, the FASB issued ASU 2024-04, *Debt– Debt with Conversion and Other Options, (subtopic 470-20).* The update is intended to improve the relevance and consistency in application of the induced conversion guidance in Subtopic 470-20 for (a) convertible debt instruments with cash conversion features and (b) debt instruments that are not currently convertible. ASU 2024-04 is effective for annual reporting periods beginning after December 15, 2025. The Company adopted this guidance during the period and this guidance did not have any impact on the Company's condensed consolidated financial statements and related disclosures.

In September 2025, the FASB issued ASU 2025-06, *Intangibles - Goodwill and Other-Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software.* The ASU amends the existing standard to remove all references to prescriptive and sequential software development project stages. Under this guidance, eligible software development costs will begin to be capitalized when management has authorized and committed to funding the software project, and it is probable that the project will be completed and the software will be used to perform the function intended. In evaluating whether it is probable the project will be completed; management is required to consider whether there is significant uncertainty associated with the development activities of the software. This guidance is effective for all annual periods beginning after December 15, 2027, and for interim periods within those annual reporting

*-9-*

**AMPHASTAR PHARMACEUTICALS, INC.**

**NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS**

**(Unaudited)**

[**Table of Contents**](#Toc)

periods, with early adoption permitted. The guidance may be applied on a prospective basis, a modified basis for in-process projects, or a retrospective basis. The Company is currently evaluating the impact of the new standard on the Company's condensed consolidated financial statements and related disclosures.

**Note 3. Revenue Recognition**

*Product revenues, net*

In accordance with ASC 606 *Revenue from Contracts with Customers*, revenue is recognized at the time that the Company's customers obtain control of the promised goods and the Company satisfies its performance obligations, which is generally at the time of product delivery to the Company's customers. In some cases, the Company's performance obligation is satisfied and revenue is recognized at the time of shipment when stipulated by the terms of the sale agreements.

The consideration to which the Company expects to be entitled includes a stated list price, less various forms of variable consideration including chargebacks and rebates, product returns, prompt pay discounts, distributor fees, patient co-pay assistance, and other related deductions. These deductions to product sales are referred to as gross-to-net deductions and are estimated and recorded in the period in which the related product sales occur. Payment terms offered to customers generally range from 30 to 75 days; however, payment terms differ by jurisdiction, by customer and, in some instances, by type of product. Revenues from product sales, net of gross-to-net deductions, are recorded only to the extent a significant reversal in the amount of cumulative revenue recognized is not probable of occurring when the uncertainty associated with gross-to-net deductions is subsequently resolved. Taxes assessed by governmental authorities and collected from customers are excluded from product sales. If the Company expects, at contract inception, that the period between the transfer of control and corresponding payment from the customer will be one year or less, the amount of consideration is not adjusted for the effects of a financing component. Shipping and handling activities are considered to be fulfillment activities rather than a separate performance obligation and are recorded within selling, distribution and marketing expenses in the accompanying condensed consolidated statements of operations.

*Chargebacks and Rebates*

Wholesaler chargebacks relate to sales terms under which the Company agrees to reimburse wholesalers for differences between the gross sales prices at which the Company sells its products to wholesalers and the actual prices of such products that wholesalers resell under the Company's various contractual arrangements with third parties such as hospitals, group purchasing organizations and pharmacy benefit managers in the United States. Rebates include primarily amounts paid to retailers, payers, and providers in the United States, including those paid to Medicare and state Medicaid programs, and are based on contractual arrangements or statutory requirements. The Company estimates chargebacks and rebates using the expected value method at the time of sale to customers based on inventory stocking levels, historical chargeback and rebate rates, and current contract pricing.

Chargebacks and rebates are reflected as a component of product revenues, net. The following table is an analysis of the chargeback and rebate activities and ending balances:

---

| | | |
|:---|:---|:---|
|  | **Three Months Ended**  | **Three Months Ended**  |
|  | **March 31,**  | **March 31,**  |
|  | **2026** | **2025** |
|  | **(in thousands)** | **(in thousands)** |
| Beginning balance | $79182 | $60331 |
| &nbsp;&nbsp;Provision for chargebacks and rebates | 117340 | 91531 |
| &nbsp;&nbsp;Credits and payments issued to third parties | (130281) | (92942) |
| Ending balance | $66241 | $58920 |

---

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**AMPHASTAR PHARMACEUTICALS, INC.**

**NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS**

**(Unaudited)**

[**Table of Contents**](#Toc)

Changes in the chargeback provision from period to period are primarily dependent on the Company's sales to its wholesalers, the level of inventory held by wholesalers, and the wholesalers' customer mix. Changes in the rebate provision from period to period are primarily dependent on retailers' and other indirect customers' purchases. The approach that the Company uses to estimate chargebacks and rebates has been consistently applied for all periods presented. Variations in estimates have been historically small. The Company continually monitors chargebacks and rebates and makes adjustments when it believes that the actual chargebacks and rebates may differ from the estimates. Accounts receivable and/or accounts payable and accrued liabilities are reduced and/or increased by the chargebacks and rebate amounts depending on whether the Company has the right to offset with the customer.

Chargebacks and rebates are included in the following balance sheet accounts:

---

| | | |
|:---|:---|:---|
|  | **March 31,** <br>**2026** | **December 31,** <br>**2025** |
|  | **(in thousands)** | **(in thousands)** |
| Reduction to accounts receivable, net | $33316 | $43820 |
| Accounts payable and accrued liabilities | 32925 | 35362 |
| Total | $66241 | $79182 |

---

*Accrual for Product Returns:* The Company offers certain customers the right to return qualified excess or expired inventory for full or partial credit. The Company's product returns primarily consist of the returns of expired products from sales made in prior periods. Returned products cannot be resold. At the time product revenue is recognized, the Company records an accrual for product returns estimated using the expected value method. The accrual is based, in part, upon the historical relationship of product returns to sales and customer contract terms. The Company also assesses other factors that could affect product returns including market conditions, product obsolescence, and new competition.

*Prompt Pay Discounts:* The Company provides its customers with a percentage discount on their invoice if the customers pay within the agreed upon timeframe. The Company generally expects that its customers will earn such prompt pay discounts. The Company estimates the probability of customers paying promptly based on the percentage of discount outlined in the purchase agreement between the two parties, and deducts the full amount of these discounts from gross product sales and accounts receivable at the time revenue is recognized.

*Distributor Fees:* The Company engages with wholesalers to distribute its products to end customers. The Company pays the wholesalers a fee for services such as: inventory management, chargeback administration, and service level commitments. The Company estimates the amount of distribution services fees to be paid and adjusts the transaction price with the amount of such estimate at the time of sale to the customer. An accrued liability is recorded for unpaid distribution service fees.

*Patient Co-Pay Assistance:* Co-pay assistance represents financial assistance to qualified patients, assisting them with prescription drug co-payments required by insurance. The accrued liability for co-pay is based on an estimate of claims and the cost per claim that the Company expects to receive associated with inventory that exists in the distribution channel at period end.

Revenues derived from contract manufacturing services are recognized when third-party products are shipped to customers. The Company's accounting policy is to review each agreement involving contract development and manufacturing services to determine if there are multiple revenue-generating activities that constitute more than one unit of account. Revenues are recognized for each unit of account based on revenue recognition criteria relevant to that unit.

Service revenues derived from research and development contracts are recognized over time based on progress toward satisfaction of the performance obligation. For each performance obligation satisfied over time, the Company assesses the proper method to be used for revenue recognition, either an input method to measure progress toward the satisfaction of services or an output method of determining the progress of completion of performance obligation. Revenues from research

*-11-*

**AMPHASTAR PHARMACEUTICALS, INC.**

**NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS**

**(Unaudited)**

[**Table of Contents**](#Toc)

and development services were $2.5 million and $0.1 million for the three months ended March 31, 2026 and 2025, respectively.

**Note 4. Net Income per Share** 

Basic net income per share is calculated based upon the weighted-average number of shares outstanding during the period. Diluted net income per share gives effect to all potentially dilutive shares outstanding during the period, such as stock options, non-vested restricted stock units, and shares issuable under the Company's Employee Stock Purchase Plan, or ESPP, and potential shares of common stock issuable upon conversion of Convertible Notes of the Company, due March 2029, or the 2029 Convertible Notes.

For the three months ended March 31, 2026, options to purchase 3,248,575 shares of stock with a weighted-average exercise price of $34.76 per share were excluded in the computation of diluted net income per share because their effect would be anti-dilutive. The 2029 Convertible Notes had no impact on the computation of diluted net income per share, as the average stock price during the period was less than the conversion price.

For the three months ended March 31, 2025, options to purchase 2,036,714 shares of stock with a weighted-average exercise price of $38.76 per share were excluded in the computation of diluted net income per share because their effect would be anti-dilutive. The 2029 Convertible Notes had no impact on the computation of diluted net income per share, as the average stock price during the period was less than the conversion price.

The following table provides the calculation of basic and diluted net income per share for each of the periods presented:

---

| | | |
|:---|:---|:---|
|  | **Three Months Ended**  | **Three Months Ended**  |
|  | **March 31,**  | **March 31,**  |
|  | **2026** | **2025** |
|  | **(in thousands, except per share data)** | **(in thousands, except per share data)** |
| Basic and dilutive numerator: |  |  |
| Net income | $6420 | $25285 |
| Denominator: |  |  |
| Weighted-average shares outstanding — basic | 45322 | 47641 |
| Net effect of dilutive securities: |  |  |
| Incremental shares from equity awards | 1136 | 2249 |
| Weighted-average shares outstanding — diluted | 46458 | 49890 |
| Net income per share — basic | $0.14 | $0.53 |
| Net income per share — diluted | $0.14 | $0.51 |

---

**Note 5. Segment Reporting**

The Company's business is the development, manufacture, and marketing of pharmaceutical products (see Note 1). The Company's Chief Executive Officer, is the Chief Operating Decision Maker, or CODM.

The CODM uses consolidated information to assess the Company's performance. As a result, the Company has one reportable segment, pharmaceutical products.

The measure of segment assets is reported on the condensed consolidated balance sheets as total assets.

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**AMPHASTAR PHARMACEUTICALS, INC.**

**NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS**

**(Unaudited)**

[**Table of Contents**](#Toc)

Selected segment financial information is presented below:

---

| | | |
|:---|:---|:---|
|  | **Three Months Ended**  | **Three Months Ended**  |
|  | **March 31,**  | **March 31,**  |
|  | **2026** | **2025** |
|  | **(in thousands)** | **(in thousands)** |
| Net revenues: | $171171 | $170528 |
| Less: |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Payroll expense | 50618 | 49310 |
| &nbsp;&nbsp;&nbsp;&nbsp;Materials and supplies | 12741 | 10479 |
| &nbsp;&nbsp;&nbsp;&nbsp;Clinical trials expense | 1552 | 948 |
| &nbsp;&nbsp;&nbsp;&nbsp;Depreciation and amortization expense | 14348 | 13609 |
| &nbsp;&nbsp;&nbsp;&nbsp;Stock-based compensation expense | 9274 | 8393 |
| &nbsp;&nbsp;&nbsp;&nbsp;Consulting and outside services expense | 10362 | 9585 |
| &nbsp;&nbsp;&nbsp;&nbsp;Advertising and promotional expense | 3060 | 3889 |
| &nbsp;&nbsp;&nbsp;&nbsp;Other segment items<sup>(1)</sup> | 55011 | 39256 |
| &nbsp;&nbsp;&nbsp;&nbsp;Interest income | (2400) | (2089) |
| &nbsp;&nbsp;&nbsp;&nbsp;Interest expense | 6553 | 6286 |
| &nbsp;&nbsp;&nbsp;&nbsp;Income tax provision | 3632 | 5577 |
| Net income | $6420 | $25285 |

---

&nbsp;&nbsp;&nbsp;&nbsp;(1) Other segment items primarily include maintenance and repairs expense, travel expense, professional services expense, legal expense, rent expense, product costs, certain overhead expenses, manufacturing cost absorption and variances, inventory provisions, miscellaneous expenses, and foreign currency exchange gains and losses.

Net revenues by product are presented below:

---

| | | |
|:---|:---|:---|
|  | **Three Months Ended**  | **Three Months Ended**  |
|  | **March 31,**  | **March 31,**  |
|  | **2026** | **2025** |
|  | **(in thousands)** | **(in thousands)** |
| **Net revenues:** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;BAQSIMI<sup>®</sup> | $32434 | $38355 |
| &nbsp;&nbsp;&nbsp;&nbsp;Primatene MIST<sup>®</sup> | 29763 | 29051 |
| &nbsp;&nbsp;&nbsp;&nbsp;Epinephrine | 19213 | 18587 |
| &nbsp;&nbsp;&nbsp;&nbsp;Lidocaine | 13460 | 13644 |
| &nbsp;&nbsp;&nbsp;&nbsp;Glucagon | 9170 | 20843 |
| &nbsp;&nbsp;&nbsp;&nbsp;Other products | 67131 | 50048 |
| Total net revenues  | $171171 | $170528 |

---

Net revenues and carrying values of long-lived assets, which includes property, plant and equipment, as well as finance and operating lease right-of-use assets, by geographic region, based on where the Company conducts its operations, are as follows:

---

| | | | | |
|:---|:---|:---|:---|:---|
|  | **Net Revenues** | **Net Revenues** | **Long-Lived Assets** | **Long-Lived Assets** |
|  | **Three Months Ended**  | **Three Months Ended**  | | |
|  | **March 31,**  | **March 31,**  | <br>**March 31,**  | <br>**December 31,**  |
|  | **2026** | **2025** | **2026** | **2025** |
|  | **(in thousands)** | **(in thousands)** | **(in thousands)** | **(in thousands)** |
| United States | $159040 | $162590 | $235034 | $206697 |
| China | 2482 | 81 | 108557 | 110055 |
| France | 9649 | 7857 | 35321 | 36967 |
| Total | $171171 | $170528 | $378912 | $353719 |

---

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**AMPHASTAR PHARMACEUTICALS, INC.**

**NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS**

**(Unaudited)**

[**Table of Contents**](#Toc)

**Note 6. Customer and Supplier Concentration**

*Customer Concentrations*

The following table provides accounts receivable and net revenue information for the Company's three major customers:

---

| | | | | |
|:---|:---|:---|:---|:---|
|  | **% of Total Accounts** | **% of Total Accounts** | **% of Net** | **% of Net** |
|  | **Receivable** | **Receivable** | **Revenues** | **Revenues** |
|  |  |  | **Three Months Ended**  | **Three Months Ended**  |
|  | **March 31,**  | **December 31,**  | **March 31,**  | **March 31,**  |
|  | **2026** | **2025** | **2026** | **2025** |
| Cencora | 25% | 28% | 21% | 21% |
| McKesson | 23% | 28% | 20% | 24% |
| Cardinal Health | 14% | 12% | 19% | 20% |

---

*Supplier Concentrations*

The Company depends on suppliers for raw materials, APIs, and other components and depends on a contract manufacturing organization, or CMO, for the supply of BAQSIMI<sup>®</sup> that are all subject to stringent FDA requirements. Some of these materials may only be available from one or a limited number of sources. Establishing additional or replacement suppliers for these materials may take a substantial period of time, as suppliers must be approved by the FDA. Furthermore, a significant portion of raw materials may only be available from foreign sources. If the Company is unable to secure, on a timely basis, sufficient quantities of the materials it depends on to manufacture and market its products, or if the Company's CMO is found to be non-compliant with the FDA's or other regulatory agencies quality system regulation, cGMP, or other applicable laws or regulations, it could have a materially adverse effect on the Company's business, financial condition, and results of operations.

**Note 7. Fair Value Measurements**

GAAP defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants in the principal or most advantageous market for the asset or liability at the measurement date (an exit price). These standards also establish a hierarchy that prioritizes observable and unobservable inputs used in measuring fair value of an asset or liability, as described below:

● *Level 1* – Inputs to measure fair value are based on quoted prices (unadjusted) in active markets on identical assets or liabilities;

● *Level 2 –* Inputs to measure fair value are based on the following: (a) quoted prices in active markets on similar assets or liabilities, (b) quoted prices for identical or similar instruments in inactive markets, or (c) observable (other than quoted prices) or collaborated observable market data used in a pricing model from which the fair value is derived; and

● *Level 3* – Inputs to measure fair value are unobservable and the assets or liabilities have little, if any, market activity; these inputs reflect the Company's own assumptions about the assumptions that market participants would use in pricing the assets or liabilities based on best information available in the circumstances.

As of March 31, 2026 and December 31, 2025, cash equivalents include money market accounts and corporate and municipal bonds with original maturities of less than three months. Investments consist of certificates of deposit as well as investment-grade corporate, agency and municipal bonds with original maturity dates between three and thirty-six months. The certificates of deposit are carried at amortized cost in the Company's condensed consolidated balance sheets, which approximates their fair value determined based on Level 2 inputs. The corporate, agency and municipal bonds are classified as held-to-maturity and are carried at amortized cost net of allowance for credit losses. The fair value

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**AMPHASTAR PHARMACEUTICALS, INC.**

**NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS**

**(Unaudited)**

[**Table of Contents**](#Toc)

of such bonds is disclosed in Note 8 and was determined based on Level 2 inputs. The restrictions on restricted cash and investments have an immaterial effect on the fair value of these financial assets.

The fair values of the Company's financial assets and liabilities measured on a recurring basis as of March 31, 2026 and December 31, 2025, are as follows:

---

| | | | | |
|:---|:---|:---|:---|:---|
|  | **Total** | **Level 1** | **Level 2** | **Level 3** |
|  | **(in thousands)** | **(in thousands)** | **(in thousands)** | **(in thousands)** |
| &nbsp;&nbsp;Cash equivalents | $98029 | $98029 | $— | $— |
| &nbsp;&nbsp;Restricted cash | 235 | 235 |  |  |
| &nbsp;&nbsp;Short-term investments | 26701 |  | 26701 |  |
| &nbsp;&nbsp;Restricted short-term investments | 2200 |  | 2200 |  |
| &nbsp;&nbsp;Interest rate swaps related to variable rate loans | (2562) |  | (2562) |  |
| Total assets and liabilities measured at fair value as of March 31, 2026 | $124603 | $98264 | $26339 | $— |

---

---

| | | | | |
|:---|:---|:---|:---|:---|
|  | **Total** | **Level 1** | **Level 2** | **Level 3** |
|  | **(in thousands)** | **(in thousands)** | **(in thousands)** | **(in thousands)** |
| &nbsp;&nbsp;Cash equivalents | $111350 | $111350 | $— | $— |
| &nbsp;&nbsp;Restricted cash | 235 | 235 |  |  |
| &nbsp;&nbsp;Short-term investments | 16530 |  | 16530 |  |
| &nbsp;&nbsp;Restricted short-term investments | 2200 |  | 2200 |  |
| &nbsp;&nbsp;Interest rate swaps related to variable rate loans | (4566) |  | (4566) |  |
| Total assets and liabilities measured at fair value as of December 31, 2025 | $125749 | $111585 | $14164 | $— |

---

The Company does not hold any Level 3 instruments that are measured at fair value on a recurring basis.

Nonfinancial assets and liabilities are not measured at fair value on a recurring basis but are subject to fair value adjustments in certain circumstances. These items primarily include investments in unconsolidated affiliates, long-lived assets, goodwill, and intangible assets for which the fair value is determined as part of an impairment test. As of March 31, 2026 and December 31, 2025, there were no significant adjustments to fair value for nonfinancial assets or liabilities.

The Company's deferred compensation plan assets are valued using the cash surrender value of the life insurance policies and are not included in the table above.

**Note 8. Investments**

The following is a summary of the Company's investments that are classified as held-to-maturity:

---

| | | | | |
|:---|:---|:---|:---|:---|
|  | <br>**Amortized**<br>**Cost** | **Gross**<br>**Unrealized**<br>**Gains** | **Gross**<br>**Unrealized**<br>**Losses** | <br>**Fair**<br>**Value** |
|  | **(in thousands)** | **(in thousands)** | **(in thousands)** | **(in thousands)** |
| Corporate and agency bonds (due within 1 year) | $92471 | $4 | $(94) | $92381 |
| Municipal bonds (due within 1 year) | 1840 |  | (1) | 1839 |
| &nbsp;&nbsp;Total investments as of March 31, 2026 | $94311 | $4 | $(95) | $94220 |
| Corporate and agency bonds (due within 1 year) | $95981 | $39 | $(60) | $95960 |
| Municipal bonds (due within 1 year) | 124 |  |  | 124 |
| &nbsp;&nbsp;Total investments as of December 31, 2025 | $96105 | $39 | $(60) | $96084 |

---

*-15-*

**AMPHASTAR PHARMACEUTICALS, INC.**

**NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS**

**(Unaudited)**

[**Table of Contents**](#Toc)

At each reporting period, the Company evaluates securities for impairment when the fair value of the investment is less than its amortized cost. The Company evaluated the underlying credit quality and credit ratings of the issuers, identifying neither a significant deterioration since purchase nor any other factors that would indicate a material credit loss.

The Company measures expected credit losses on held-to-maturity investments on a collective basis. All the Company's held-to-maturity investments were considered to be one pool. The estimate for credit losses considers historical loss information that is adjusted for current conditions and reasonable and supportable forecasts. Expected credit losses on held-to-maturity investments were not material to the condensed consolidated financial statements**.**

**Note 9. Goodwill and Intangible Assets**

The table below shows the weighted-average life, original cost, accumulated amortization, and net book value by major intangible asset classification:

---

| | | | | |
|:---|:---|:---|:---|:---|
|  | **Weighted-Average**<br>**Life (Years)** | <br>**Original Cost** | **Accumulated**<br>**Amortization** | <br>**Net Book Value** |
|  | **(in thousands)** | **(in thousands)** | **(in thousands)** | **(in thousands)** |
| *Definite-lived intangible assets* |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;BAQSIMI<sup>®</sup> product rights | 24 | $591338 | $67758 | $523580 |
| &nbsp;&nbsp;&nbsp;&nbsp;Land-use rights | 39 | 2540 | 963 | 1577 |
| &nbsp;&nbsp;&nbsp;&nbsp;Other intangibles  | 7 | 2443 | 532 | 1911 |
| Subtotal | 24 | 596321 | 69253 | 527068 |
| *Indefinite-lived intangible assets* |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Trademark | \* | 29225 |  | 29225 |
| &nbsp;&nbsp;&nbsp;&nbsp;Goodwill | \* | 3330 |  | 3330 |
| Subtotal | \* | 32555 |  | 32555 |
| &nbsp;&nbsp;&nbsp;&nbsp; As of March 31, 2026 | \* | $628876 | $69253 | $559623 |

---

---

| | | | | |
|:---|:---|:---|:---|:---|
|  | **Weighted-Average**<br>**Life (Years)** | <br>**Original Cost** | **Accumulated**<br>**Amortization** | <br>**Net Book Value** |
|  | **(in thousands)** | **(in thousands)** | **(in thousands)** | **(in thousands)** |
| *Definite-lived intangible assets* |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;BAQSIMI<sup>®</sup> product rights | 24 | $591338 | $61597 | $529741 |
| &nbsp;&nbsp;&nbsp;&nbsp;Land-use rights | 39 | 2540 | 947 | 1593 |
| &nbsp;&nbsp;&nbsp;&nbsp;Other intangibles  | 7 | 2443 | 439 | 2004 |
| Subtotal | 24 | 596321 | 62983 | 533338 |
| *Indefinite-lived intangible assets* |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Trademark | \* | 29225 |  | 29225 |
| &nbsp;&nbsp;&nbsp;&nbsp;Goodwill | \* | 3402 |  | 3402 |
| Subtotal | \* | 32627 |  | 32627 |
| &nbsp;&nbsp;&nbsp;&nbsp; As of December 31, 2025 | \* | $628948 | $62983 | $565965 |

---

<sup>\*</sup> Intangible assets with indefinite lives have an indeterminable average life.

*-16-*

**AMPHASTAR PHARMACEUTICALS, INC.**

**NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS**

**(Unaudited)**

[**Table of Contents**](#Toc)

*Goodwill*

The changes in the carrying amounts of goodwill are as follows:

---

| | | |
|:---|:---|:---|
|  | **March 31,** <br>**2026** | **December 31,** <br>**2025** |
|  | **(in thousands)** | **(in thousands)** |
| Beginning balance | $3402 | $3049 |
| &nbsp;&nbsp;Currency translation | (72) | 353 |
| Ending balance | $3330 | $3402 |

---

**Note 10. Inventories**

Inventories consist of the following:

---

| | | |
|:---|:---|:---|
|  | **March 31,** <br>**2026** | **December 31,** <br>**2025** |
|  | **(in thousands)** | **(in thousands)** |
| Raw materials and supplies | $104663 | $106832 |
| Work in process | 42638 | 40440 |
| Finished goods | 22893 | 29618 |
| Total inventories | $170194 | $176890 |

---

Charges of $2.2 million and $0.2 million were included in the cost of revenues in the Company's condensed consolidated statements of operations for the three months ended March 31, 2026 and 2025, respectively, to adjust the Company's inventory and related firm purchase commitments to their net realizable value.

**Note 11. Property, Plant, and Equipment**

Property, plant, and equipment consist of the following:

---

| | | |
|:---|:---|:---|
|  | **March 31,** <br>**2026** | **December 31,** <br>**2025** |
|  | **(in thousands)** | **(in thousands)** |
| Buildings | $196308 | $196675 |
| Leasehold improvements | 46141 | 46098 |
| Land | 7527 | 7554 |
| Machinery and equipment | 302497 | 302330 |
| Furniture, fixtures, and automobiles | 40404 | 39769 |
| Construction in progress | 27726 | 24407 |
| Total property, plant, and equipment | 620603 | 616833 |
| &nbsp;&nbsp;&nbsp;&nbsp;Less: accumulated depreciation | (313372) | (306266) |
| Total property, plant, and equipment, net | $307231 | $310567 |

---

*-17-*

**AMPHASTAR PHARMACEUTICALS, INC.**

**NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS**

**(Unaudited)**

[**Table of Contents**](#Toc)

**Note 12. Accounts Payable and Accrued Liabilities**

Accounts payable and accrued liabilities consisted of the following:

---

| | | |
|:---|:---|:---|
|  | **March 31,** <br>**2026** | **December 31,** <br>**2025** |
|  | **(in thousands)** | **(in thousands)** |
| Accrued customer fees and rebates | $53808 | $56362 |
| Accrued payroll and related benefits | 30573 | 26318 |
| Accrued product returns, current portion | 19352 | 18568 |
| Other accrued liabilities | 13455 | 14508 |
| Total accrued liabilities | 117188 | 115756 |
| Accounts payable | 35500 | 32592 |
| Total accounts payable and accrued liabilities | $152688 | $148348 |

---

**Note 13. Debt**

Debt consists of the following:

---

| | | |
|:---|:---|:---|
|  | **March 31,** <br>**2026** | **December 31,** <br>**2025** |
|  | **(in thousands)** | **(in thousands)** |
| ***Convertible Debt*** |  |  |
| 2029 Convertible Notes | $345000 | $345000 |
| ***Term Loan*** |  |  |
| Wells Fargo Term Loan due June 2028 | 250000 | 250000 |
| ***Other Loans and Payment Obligations*** |  |  |
| French government loans due December 2026 | 57 | 56 |
| ***Line of Credit Facilities*** |  |  |
| Line of credit facility with China Merchant Bank due October 2026 |  |  |
| Wells Fargo Revolving line of credit facility due June 2028 |  |  |
| Line of credit facility with ICBC Bank due November 2033 | 25052 | 24649 |
| Equipment under Finance Leases | 232 | 264 |
| Total debt | 620341 | 619969 |
| &nbsp;&nbsp;&nbsp;&nbsp;Less: current portion of long-term debt | 1671 | 1641 |
| &nbsp;&nbsp;&nbsp;&nbsp;Less: loan issuance costs | 8869 | 9579 |
| Long-term debt, net of current portion and unamortized debt issuance costs | $609801 | $608749 |

---

**Credit Agreement**

*2029 Convertible Notes*

In September 2023, the Company issued the 2029 Convertible Notes, in the aggregate principal amount of $345.0

*-18-*

**AMPHASTAR PHARMACEUTICALS, INC.**

**NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS**

**(Unaudited)**

[**Table of Contents**](#Toc)

million in a private offering pursuant to Section 4(a)(2) and Rule 144A under the Securities Act of 1933, as amended. The Company used portions of the net proceeds from the 2029 Convertible Notes to (i) repay approximately $200.0 million of the Company's borrowings under the Wells Fargo Term Loan and (ii) repurchase $50.0 million of the Company's common stock.

In connection with the issuance of the 2029 Convertible Notes, the Company incurred approximately $10.8 million of debt issuance costs, which primarily consisted of underwriting, legal and other professional fees. Unamortized debt issuance costs related to the 2029 Convertible Notes were $5.8 million and $6.3 million as of March 31, 2026 and December 31, 2025, respectively. The fair value of the 2029 Convertible Notes was approximately $312.4 million as of March 31, 2026 based on Level 2 inputs.

The total interest expense related to the 2029 Convertible Notes was $2.2 million, with coupon interest expense of $1.7 million, and the amortization of debt issuance cost of $0.5 million in both periods presented.

The 2029 Convertible Notes are general senior, unsecured obligations and bear an interest rate of 2.0% per year. The 2029 Convertible Notes were issued pursuant to an indenture, dated September 15, 2023, or the Indenture, between the Company and U.S. Bank Trust Company, National Association, as trustee.

The 2029 Convertible Notes will rank senior in right of payment to all of the Company's indebtedness that is expressly subordinated in right of payment to the 2029 Convertible Notes; equal in right of payment to all of the Company's unsecured indebtedness that is not so subordinated; effectively junior to any of the Company's secured indebtedness to the extent of the value of the assets securing such indebtedness, including any amount outstanding under the Company's credit facilities; and structurally junior to all indebtedness and other liabilities of the Company's current or future subsidiaries, including trade payables.

Interest is payable semi-annually in arrears on March 15 and September 15 of each year. The 2029 Convertible Notes may bear additional interest under specified circumstances relating to the Company's failure to comply with its reporting obligations under the Indenture or if the 2029 Convertible Notes are not freely tradeable as required by the Indenture.

The 2029 Convertible Notes will mature on March 15, 2029, unless earlier converted, repurchased or redeemed.

Conversions of the 2029 Convertible Notes will be settled in cash up to the aggregate principal amount of the 2029 Convertible Notes to be converted, and cash, shares of common stock or a combination of cash and shares of common stock, at the Company's election, with respect to the remainder, if any, of the Company's conversion obligation in excess of the aggregate principal amount.

Holders may convert their 2029 Convertible Notes at their option prior to the close of business on the business day immediately preceding December 15, 2028, in multiples of $1,000 principal amount, only under the following circumstances: (i) during any calendar quarter commencing after the calendar quarter ending on December 31, 2023 (and only during such calendar quarter), if the last reported sale price of the common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price for the 2029 Convertible Notes on each applicable trading day, (ii) during the five business day period after any five consecutive trading day period in which the trading price, as defined in the Indenture, per $1,000 principal amount of the 2029 Convertible Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the Company's common stock and the conversion rate on each such trading day, (iii) if the Company calls the 2029 Convertible Notes for redemption, at any time prior to the close of business on the second scheduled trading day immediately preceding the redemption date, and (iv) upon the occurrence of specified corporate events defined in the Indenture.

On or after December 15, 2028, until the close of business on the second scheduled trading day immediately preceding

*-19-*

**AMPHASTAR PHARMACEUTICALS, INC.**

**NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS**

**(Unaudited)**

[**Table of Contents**](#Toc)

the maturity date, holders may convert all or any portion of their 2029 Convertible Notes, in multiples of $1,000 principal amount, at the option of the holder regardless of the foregoing circumstances.

The Company may redeem the 2029 Convertible Notes, at its option, in whole or in part (subject to certain limitations), on or after September 20, 2026 and prior to the 41<sup>st</sup> scheduled trading day preceding the maturity date, if the last reported sale price of the Company's common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period (including the last trading day of such period) ending on and including the trading day immediately preceding the date on which the Company provides notice of redemption at a redemption price equal to 100% of the principal amount of the 2029 Convertible Notes to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date.

The initial conversion rate is 15.8821 shares of the Company's common stock per $1,000 principal amount of the 2029 Convertible Notes, which represents an initial conversion price of approximately $62.96 per share of common stock. The initial conversion price of $62.96 represents a premium of approximately 35.0% over the last reported sale price of the Company's common stock on Nasdaq Global Select Market on September 12, 2023. The conversion rate is subject to adjustment under certain circumstances in accordance with the terms of the Indenture.

If a fundamental change, as defined in the Indenture, occurs at any time prior to the maturity date, then, subject to certain conditions, holders of the 2029 Convertible Notes may require the Company to repurchase for cash all or any portion of their 2029 Convertible Notes at a repurchase price equal to 100% of the principal amount of the 2029 Convertible Notes to be repurchased, plus any accrued and unpaid interest. In addition, following certain specified corporate events or if the Company issues a notice of redemption, the Company will, under certain circumstances, increase the conversion rate for holders who convert their 2029 Convertible Notes in connection with such corporate event or during a redemption period.

*Syndicated Line of Credit Facility with ICBC Bank – Due November 2033*

In January 2024, the Company entered into a credit agreement with Industrial and Commercial Bank of China Limited, or ICBC Bank, acting as a lender and as agent for other lenders. The credit agreement allows the Company to borrow up to $40.0 million secured by equipment and buildings at our Chinese subsidiary. The interest rate and other terms will be determined at the time of the borrowing, depending on the type of loan requested. The credit agreement expires in November 2033.

The loan bears interest at the prime rate as published by *The People's Bank of China* minus 0.2%. Interest payments are due quarterly and repayment of the principal amount is biannual and begins in May 2026. As of March 31, 2026, the Company had $25.1 million of principal outstanding under this loan, which is recorded net of loan issuance costs of $1.3 million.

**Interest Rate Swap Contract**

As of March 31, 2026, the fair value of the loans listed above approximated their carrying amount based on Level 2 inputs, with the exception of the 2029 Convertible Notes. For the Wells Fargo Term Loan, the Company has entered into a fixed interest rate swap contract to exchange the variable interest rates for fixed interest rates. The interest rate swap contract is recorded at fair value in the other long-term liabilities line in the condensed consolidated balance sheets. Changes in the fair values of interest rate swaps were a $2.0 million gain and a $2.9 million loss for the three months ended March 31, 2026 and 2025, respectively.

**Covenants**

At March 31, 2026 and December 31, 2025, the Company was in compliance with all of its debt covenants.

*-20-*

**AMPHASTAR PHARMACEUTICALS, INC.**

**NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS**

**(Unaudited)**

[**Table of Contents**](#Toc)

**Note 14. Income Taxes**

The following table sets forth the Company's income tax provision for the periods indicated:

---

| | | |
|:---|:---|:---|
|  | **Three Months Ended**  | **Three Months Ended**  |
|  | **March 31,**  | **March 31,**  |
|  | **2026** | **2025** |
|  | **(in thousands)** | **(in thousands)** |
| Income before taxes | $10052 | $30862 |
| Income tax provision | 3632 | 5577 |
| Net income | $6420 | $25285 |
| Income tax provision as a percentage of income before income taxes | 36.1% | 18.1% |

---

*Valuation Allowance*

In assessing the need for a valuation allowance, management considers whether it is more likely than not that some portion or all of the deferred income tax assets will be realized. Ultimately, realization depends on the existence of future taxable income. Management considers sources of taxable income such as income in prior carryback periods, future reversal of existing deferred taxable temporary differences, tax-planning strategies, and projected future taxable income.

The Company continues to record a full valuation allowance on the net deferred income tax assets of its French subsidiary and its U.K. subsidiaries, and will continue to do so until the subsidiaries generate sufficient taxable income to realize their respective deferred income tax assets.

The Company also records a valuation allowance on net deferred income tax assets in states where it files separately and will continue to do so until sufficient taxable income is generated to realize these state deferred income tax assets.

**Note 15. Stockholders' Equity**

*Share Buyback Program*

Pursuant to the Company's existing share buyback program, the Company purchased 1,373,345 and 393,836 shares of its common stock, totaling $29.5 million and $11.0 million, for the three months ended March 31, 2026 and 2025, respectively.

Purchases are made through open market and private block transactions pursuant to Rule 10b5-1 plans, privately negotiated transactions or other means as determined by the Company's management and in accordance with the requirements of the SEC and applicable laws. The timing and actual number of treasury share purchases will depend on a variety of factors including price, corporate and regulatory requirements, and other conditions. These treasury share purchases are accounted for under the cost method and are included as a component of treasury stock in the Company's condensed consolidated balance sheets.

*Amended and Restated 2015 Equity Incentive Plan*

In February 2024, the Board of Directors approved the Company's amended and restated 2015 Equity Incentive Plan, or the Amended 2015 Plan, which was subsequently approved by the Company's stockholders, and accordingly, adopted by the Company in June 2024. The Amended 2015 Plan, among other things, extended the term of the 2015 Equity

*-21-*

**AMPHASTAR PHARMACEUTICALS, INC.**

**NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS**

**(Unaudited)**

[**Table of Contents**](#Toc)

Incentive Plan, or the Original 2015 Plan, increased the number of shares available for issuance under the Original 2015 Plan, and removed the evergreen provision. The term of the Amended 2015 Plan will be extended indefinitely, however, the Company's ability to grant incentive stock options thereunder will continue through February 2034.

As of March 31, 2026, the Company reserved an aggregate of 4,707,576 shares of common stock for future issuance under the Amended 2015 Plan.

*2014 Employee Stock Purchase Plan* 

As of March 31, 2026, the Company has issued 1,443,046 shares of common stock under the ESPP and 556,954 shares of its common stock remain available for issuance under the ESPP.

For the three months ended March 31, 2026 and 2025, the Company recorded ESPP expense of $0.3 million and $0.3 million, respectively.

*Share-Based Award Activity and Balances* 

The Company accounts for share-based compensation payments in accordance with ASC 718, which requires measurement and recognition of compensation expense at fair value for all share-based payment awards made to employees and directors. Under these standards, the fair value of option awards and the option components of the ESPP awards are estimated at the grant date using the Black-Scholes option-pricing model. The fair value of RSUs is estimated at the grant date using the Company's common share price. The Company records share-based compensation expense net of expected forfeitures. Compensation cost for all share-based payments granted with service-based graded vesting schedules is recognized using the straight-line method over the requisite service period.

The weighted-averages for key assumptions used in determining the fair value of options granted are as follows:

---

| | | |
|:---|:---|:---|
|  | **Three Months Ended**  | **Three Months Ended**  |
|  | **March 31,**  | **March 31,**  |
|  | **2026** | **2025** |
| Average volatility | 43.4% | 40.8% |
| Average risk-free interest rate | 3.9% | 4.2% |
| Weighted-average expected life in years | 6.3 | 6.3 |
| Dividend yield rate | —% | —% |

---

A summary of option activity under all plans for the three months ended March 31, 2026, is presented below:

---

| | | | | |
|:---|:---|:---|:---|:---|
|  | <br>**Options** | <br>**Weighted-Average**<br>**Exercise**<br>**Price** | **Weighted-Average**<br>**Remaining**<br>**Contractual**<br>**Term (Years)** | <br>**Aggregate**<br>**Intrinsic**<br>**Value**<sup>(1)</sup> |
|  |  |  |  | **(in thousands)** |
| Outstanding as of December 31, 2025 | 6884390 | $25.75 |  |  |
| &nbsp;&nbsp;Options granted | 1678489 | 19.21 |  |  |
| &nbsp;&nbsp;Options exercised | (156499) | 11.82 |  |  |
| &nbsp;&nbsp;Options forfeited | (23048) | 35.65 |  |  |
| &nbsp;&nbsp;Options expired | (396651) | 21.97 |  |  |
| Outstanding as of March 31, 2026 | 7986681 | $24.81 | 6.40 | $8868 |
| Exercisable as of March 31, 2026 | 4914135 | 24.44 | 4.60 | $8230 |
| Vested and expected to vest as of March 31, 2026 | 7707421 | 24.85 | 6.29 | $8799 |

---

&nbsp;&nbsp;&nbsp;&nbsp;(1) The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying awards and the estimated fair value of the Company's stock for those awards that have an exercise price below the estimated fair value at March 31, 2026.

*-22-*

**AMPHASTAR PHARMACEUTICALS, INC.**

**NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS**

**(Unaudited)**

[**Table of Contents**](#Toc)

For the three months ended March 31, 2026 and 2025, the Company recorded expense of $4.7 million and $4.2 million, respectively, related to stock options granted under all plans.

Information relating to option grants and exercises is as follows:

---

| | | |
|:---|:---|:---|
|  | **Three Months Ended**  | **Three Months Ended**  |
|  | **March 31,**  | **March 31,**  |
|  | **2026** | **2025** |
|  | **(in thousands, except per share data)** | **(in thousands, except per share data)** |
| Weighted-average grant date fair value per share | $9.31 | $13.38 |
| Intrinsic value of options exercised | 1724 | 7833 |
| Cash received from options exercised | 1850 | 2068 |
| Total fair value of the options vested during the period | 11910 | 10678 |

---

A summary of the status of the Company's non-vested options as of March 31, 2026, and changes during the three months ended March 31, 2026, are presented below:

---

| | | |
|:---|:---|:---|
|  | <br>**Options** | **Weighted-Average**<br>**Grant Date**<br>**Fair Value** |
| Non-vested as of December 31, 2025 | 2153209 | $15.73 |
| &nbsp;&nbsp;Options granted | 1678489 | 9.31 |
| &nbsp;&nbsp;Options vested | (736104) | 16.18 |
| &nbsp;&nbsp;Options forfeited | (23048) | 16.78 |
| Non-vested as of March 31, 2026 | 3072546 | 12.11 |

---

As of March 31, 2026, there was $31.1 million of total unrecognized compensation cost, net of forfeitures, related to non-vested stock option-based compensation arrangements granted under all plans. The cost is expected to be recognized over a weighted-average period of 3.1 years and will be adjusted for future changes in estimated forfeitures.

*Restricted Stock Units*

The Company grants restricted stock units, or RSUs, to certain employees and members of the Board of Directors with a vesting period of up to four years. The grantee receives one share of common stock at a specified future date for each RSU awarded. The RSUs may not be sold or otherwise transferred until vested. The RSUs do not have any voting or dividend rights prior to the issuance of the underlying common stock. The share-based expense associated with these grants was based on the Company's common stock fair value at the time of grant and is amortized over the requisite service period, which generally is the vesting period using the straight-line method. For the three months ended March 31, 2026 and 2025, the Company recorded expenses of $4.3 million and $3.9 million, respectively, related to RSU awards granted under all plans.

As of March 31, 2026, there was $32.2 million of total unrecognized compensation cost, net of forfeitures, related to non-vested RSU based compensation arrangements granted under all plans. The cost is expected to be recognized over a weighted-average period of 3.0 years and will be adjusted for future changes in estimated forfeitures.

*-23-*

**AMPHASTAR PHARMACEUTICALS, INC.**

**NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS**

**(Unaudited)**

[**Table of Contents**](#Toc)

Information relating to RSU grants and deliveries is as follows:

---

| | | |
|:---|:---|:---|
|  | <br>**Total RSUs**<br>**Issued** | **Total Fair Market**<br>**Value of RSUs**<br>**Issued**<sup>(1)</sup> |
|  |  | **(in thousands)** |
| RSUs outstanding at December 31, 2025 | 1007433 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;RSUs granted | 813454 | $15626 |
| &nbsp;&nbsp;&nbsp;&nbsp;RSUs forfeited | (10827) |  |
| &nbsp;&nbsp;&nbsp;&nbsp;RSUs vested<sup>(2)</sup> | (341314) |  |
| RSUs outstanding at March 31, 2026 | 1468746 |  |

---

&nbsp;&nbsp;&nbsp;&nbsp;(1) The total FMV is derived from the number of RSUs granted times the current stock price on the date of grant.

&nbsp;&nbsp;&nbsp;&nbsp;(2) Of the vested RSUs, 133,119 shares of common stock were surrendered to fulfill tax withholding obligations.

*Share-based Compensation Expense*

The Company recorded share-based compensation expense, which is included in the Company's condensed consolidated statement of operations as follows:

---

| | | |
|:---|:---|:---|
|  | **Three Months Ended**  | **Three Months Ended**  |
|  | **March 31,**  | **March 31,**  |
|  | **2026** | **2025** |
|  | **(in thousands)** | **(in thousands)** |
| Cost of revenues | $2456 | $2338 |
| Operating expenses: |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Selling, distribution, and marketing | 360 | 313 |
| &nbsp;&nbsp;&nbsp;&nbsp;General and administrative | 5137 | 4569 |
| &nbsp;&nbsp;&nbsp;&nbsp;Research and development | 1321 | 1173 |
| Total share-based compensation | $9274 | $8393 |

---

**Note 16. Employee Benefits**

*401(k) Plan*

The Company has a defined contribution 401(k) plan, or the Plan, whereby eligible employees voluntarily contribute up to a defined percentage of their annual compensation. The Company matches contributions at a rate of 50% on the first 6% of employee contributions, and pays the administrative costs of the Plan. Total employer contributions for the three months ended March 31, 2026 and 2025, were approximately $0.7 million and $0.7 million, respectively.

*Defined Benefit Pension Plan*

The Company's French subsidiary, has an obligation associated with a defined-benefit plan for its eligible employees. This plan provides benefits to the employees from the date of retirement and is based on the employee's length of time employed by the Company. The calculation is based on a statistical calculation combining a number of factors that include the employee's age, length of service, and employee turnover rate.

The liability under the plan is based on a discount rate of 3.95% as of March 31, 2026 and December 31, 2025. The liability is included in other long-term liabilities in the accompanying condensed consolidated balance sheets. The plan is currently unfunded, and the benefit obligation under the plan was $2.6 million and $2.7 million at March 31, 2026 and December 31, 2025, respectively. The Company did not incur any expense under the plan for the three months ended March 31, 2026. The Company recorded an immaterial amount of expense under the plan for the three months ended March 31, 2025. Gain or loss due to change in actuarial valuation of the Company's defined benefit pension plan was not material.

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**AMPHASTAR PHARMACEUTICALS, INC.**

**NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS**

**(Unaudited)**

[**Table of Contents**](#Toc)

*Non-qualified Deferred Compensation Plan*

In December 2019, the Company established a non-qualified deferred compensation plan. The plan allows certain eligible participants to defer a portion of their cash compensation and provides a matching contribution at the discretion of the Company. The plan obligations are payable upon retirement, termination of employment and/or certain other times in a lump-sum distribution or in installments, as elected by the participant in accordance with the plan. Participants can allocate their deferred compensation amongst various investment options with earnings accruing to the participant. The Company has established a Rabbi Trust to fund the plan obligations and to hold the plan assets. Eligible participants began contributing to the plan in January 2020. The plan assets were valued at approximately $14.4 million and $14.5 million as of March 31, 2026 and December 31, 2025, respectively. The plan liabilities were valued at approximately $15.0 million and $15.0 million as of March 31, 2026 and December 31, 2025, respectively. The plan assets and liabilities are included in other long-term assets and other long-term liabilities, respectively, on the Company's condensed consolidated balance sheets.

**Note 17. Commitments and Contingencies**

*Lease Liabilities*

Right-of-Use, or ROU, assets represent the Company's right to control an underlying asset for the lease term and lease liabilities represent the Company's obligation to make lease payments arising from the lease. The classification of the Company's leases as operating or finance leases along with the initial measurement and recognition of the associated ROU assets and lease liabilities is performed at the lease commencement date and the measurement of lease liabilities is based on the present value of lease payments over the lease term. Lease terms are generally based on their initial non-cancelable terms, unless there is a renewal option that is reasonably certain to be exercised. Various factors, including economic incentives, intent, past history, and business needs are considered to determine if a renewal option is reasonably certain to be exercised. As most of its leases do not provide an implicit rate, the Company uses its incremental borrowing rate based on the information available at the commencement date in determining the discount rate used to present value the lease payments. The ROU asset is based on the measurement of the lease liability, includes any lease payments made prior to or on lease commencement and excludes lease incentives and initial direct costs incurred, as applicable. Lease expense for the Company's operating leases is recognized on a straight-line basis over the lease term. The Company has lease agreements with both lease and non-lease components, which are accounted for as a single component for all asset classes. The Company leases real and personal property, in the normal course of business, under various non-cancelable operating leases. The Company, at its option, can renew a substantial portion of its leases, at the market rate, for various renewal periods ranging from one to six years.

In July 2025, the Company entered into an agreement to lease approximately 225,167 square feet of building space in Rancho Cucamonga, California. The non-cancelable lease term is approximately 10 years with a renewal option to extend the lease for two additional five-year periods. The monthly lease payments are $0.3 million subject to an annual increase of 3.25%. Upon the lease commencement in January 2026, the Company recorded an initial ROU asset of $27.7 million and corresponding operating lease liability of $27.4 million, based on an incremental borrowing rate of 7.0%. The renewal option was not considered in the determination of the ROU asset or operating lease liability as the Company is not reasonably certain it would exercise this option.

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**AMPHASTAR PHARMACEUTICALS, INC.**

**NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS**

**(Unaudited)**

[**Table of Contents**](#Toc)

The components of lease costs were as follows:

---

| | | |
|:---|:---|:---|
|  | **Three Months Ended**  | **Three Months Ended**  |
|  | **March 31,**  | **March 31,**  |
|  | **2026** | **2025** |
|  | **(in thousands)** | **(in thousands)** |
| Operating lease costs | $3418 | $2346 |
| Short-term lease costs | 156 | 154 |
| Finance lease costs |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Amortization of right-of-use assets | 36 | 41 |
| &nbsp;&nbsp;&nbsp;&nbsp;Interest on lease liabilities  | 4 | 7 |
| Total finance lease costs | $40 | $48 |
| Total lease costs | $3614 | $2548 |

---

Other information pertaining to leases is as follows:

---

| | | |
|:---|:---|:---|
|  | **Three Months Ended**  | **Three Months Ended**  |
|  | **March 31,**  | **March 31,**  |
|  | **2026** | **2025** |
|  | **(in thousands, except lease term and discount rate)** | **(in thousands, except lease term and discount rate)** |
| **Cash paid for amounts included in the measurement of lease liabilities** |  |  |
| &nbsp;&nbsp;Operating cash flows paid for operating leases | $1303 | $1225 |
| &nbsp;&nbsp;Operating cash flows paid for finance leases | 2 | 4 |
| &nbsp;&nbsp;Financing cash flows paid for finance leases | 29 | 38 |
| **Right-of use assets obtained in exchange for lease liabilities** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Operating leases | 30709 | 521 |
| &nbsp;&nbsp;&nbsp;&nbsp;Finance leases |  |  |
| **Weighted-average remaining lease term (years)** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Operating leases | 7.5 | 6.4 |
| &nbsp;&nbsp;&nbsp;&nbsp;Finance leases | 1.4 | 2.3 |
| **Weighted-average discount rate** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Operating leases | 6.9% | 6.3% |
| &nbsp;&nbsp;&nbsp;&nbsp;Finance leases | 7.0% | 6.8% |

---

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**AMPHASTAR PHARMACEUTICALS, INC.**

**NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS**

**(Unaudited)**

[**Table of Contents**](#Toc)

Future minimum rental payments under leases that have initial or remaining non-cancelable lease terms in excess of 12 months as of March 31, 2026, are as follows:

---

| | | | |
|:---|:---|:---|:---|
|  | **Operating**<br>**Leases** | **Finance**<br>**Leases** | <br>**Total** |
|  | **(in thousands)** | **(in thousands)** | **(in thousands)** |
| 2026 (excluding the three months ended March 31, 2026) | $11171 | $139 | $11310 |
| 2027 | 13042 | 104 | 13146 |
| 2028 | 12906 |  | 12906 |
| 2029 | 12901 |  | 12901 |
| 2030 | 13031 |  | 13031 |
| Thereafter | 33611 |  | 33611 |
| Total lease payments | $96662 | $243 | $96905 |
| &nbsp;&nbsp;Less: interest | 21756 | 11 | 21767 |
| Total | $74906 | $232 | $75138 |

---

*BAQSIMI*<sup>®</sup>

In connection with the BAQSIMI<sup>®</sup> acquisition from Eli Lilly & Company, or Lilly, the Company may also be required to pay additional contingent consideration of up to $450.0 million to Lilly based on the achievement of certain milestones. The Purchase Agreement provides that the contingent consideration that may become payable to Lilly would be achieved as follows: (i) a one-time payment of $100.0 million if the Company achieves annual net sales of $175.0 million or more of BAQSIMI<sup>®</sup> and certain related products, or the Milestone Products, in any one contract year during the first five years after the Closing; (ii) up to two payments of $100.0 million each if the Company achieves annual net sales of $200.0 million or more of Milestone Products in any one contract year during the first five years after the Closing; and (iii) a one-time payment of $150.0 million if the Company achieves total cumulative net sales of $950.0 million or more of the Milestone Products for the first five years after the Closing.

In addition, the Company assumed certain contingent consideration of Lilly, which would require the Company to pay up to an aggregate of $125.0 million based on the achievement of annual net sales milestones of $350.0 million, $400.0 million and $600.0 million. Through March 31, 2026, the Company has not triggered any milestones and therefore no amounts have been recognized or paid.

*Licensing Agreement with Nanjing Anji Biotechnology Co., Ltd.*

In August 2025, the Company and Nanjing Anji Biotechnology Co., Ltd., or Anji, entered into a License Agreement, or License Agreement, pursuant to which Anji has granted the Company an exclusive license to certain intellectual property to develop, make, use and commercialize products incorporating or comprising certain compounds, including three identified products, or Licensed Products, in the United States and Canada, or the Territory. Anji has also been granted a non-exclusive license under certain intellectual property controlled by the Company to develop, make, use and commercialize Licensed Products outside the Territory.

As part of the agreement, in 2025, the Company made earnest money and upfront payments for a total of $6.0 million, which was recorded as a research and development expense in the Company's condensed consolidated statement of operations.

The Company is also obligated to make cash payments to Anji, consisting of up to $42.0 million in development-based milestone payments and up to $225.0 million in sales-based milestone payments, subject to the achievement of the

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**AMPHASTAR PHARMACEUTICALS, INC.**

**NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS**

**(Unaudited)**

[**Table of Contents**](#Toc)

applicable development and sales milestone events respectively, and royalty payments of 5% on net sales, not to exceed a maximum annual amount of $22.5 million each calendar year for each Licensed Product and a maximum accumulated amount of $60.0 million for each Licensed Products. The Company is also required to pay Anji a certain percentage of sublicense income received from the sublicense transactions. The term of this License Agreement will expire, on a Licensed Product-by-Licensed Product and region-by-region basis, on the tenth anniversary of the first commercial sale of such Licensed Product in the applicable region in the Territory, with the Company having the right to extend the License Agreement until the earlier of ten additional years or the expiration, lapse, or invalidation of the last remaining valid claim of the patents licensed by Anji to the Company that covers the Licensed Products in the Territory. Through March 31, 2026, the Company has not triggered any milestones and therefore no amounts have been recognized or paid.

*Licensing Agreement with Nanjing Hanxin Pharmaceutical Technology Co., Ltd.* 

In January 2026, the Company and Nanjing Hanxin Pharmaceutical Technology Co., Ltd., or Hanxin, a related party, entered into a license agreement pursuant to which Hanxin has granted the Company an exclusive license to certain intellectual property controlled by Hanxin to develop, make, use and commercialize products incorporating or comprising of corticotropin compound, or corticotropin, in the United States and Canada, or the Territory. Hanxin has also granted a non-exclusive license under certain intellectual property controlled by the Company to develop, make, use and commercialize corticotropin outside the Territory.

As part of the agreement, the Company made an upfront payment of $2.0 million during the three months ended March 31, 2026, which was recorded as a research and development expense in the Company's condensed consolidated statement of operations.

The Company is also obligated to make cash payments to Hanxin, consisting of up to $14.0 million in development milestone payments and up to $75.0 million in sales milestone payments, subject to the achievement of the applicable development and sales milestone events respectively, and royalty payments of 5% on net sales, not to exceed a maximum annual amount of $7.5 million each calendar year and a maximum accumulated amount of $60.0 million for corticotropin. Hanxin will pay to the Company a royalty payment of net sales of corticotropin that are based on any patents licensed by the Company to Hanxin under the License Agreement or regulatory exclusivity covering corticotropin. The term of the license agreement will expire, region-by-region basis, on the tenth anniversary of the first commercial sale of corticotropin in the applicable region, with the Company having the right to extend the license agreement until the earlier of ten additional years or the expiration, lapse, or invalidation of the last remaining valid claim of the patents licensed by Hanxin to the Company that covers the product. Through March 31, 2026, the Company has not triggered any milestones and therefore no amounts have been recognized or paid.

**Note 18. Related Party Transactions**

*Hanxin Pharmaceutical Technology, Co., Ltd.*

The Company has an 11.5% ownership in Hanxin that is accounted for as an equity method investment. The Company maintains a seat on Hanxin's board of directors, and Henry Zhang, the son of Dr. Jack Zhang, is an equity holder, the general manager, and the chairman of the board of directors of Hanxin. Additionally, Dr. Mary Luo and Dr. Jack Zhang, have an ownership interest in Hanxin through an affiliated entity. As a result, Hanxin is a related party.

*Contract Manufacturing Agreements with Hanxin*

The Company has various contract manufacturing agreements with Hanxin and its subsidiaries, whereby Hanxin will develop several active pharmaceutical ingredients and finished products for the Chinese market and will engage the Company to manufacture the products on a cost-plus basis.

In January 2026, the Company amended the contract manufacturing agreement with Hanxin to expand the territory of the

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**AMPHASTAR PHARMACEUTICALS, INC.**

**NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS**

**(Unaudited)**

[**Table of Contents**](#Toc)

Manufacturing Agreement. Additionally, the amendment clarifies the intellectual property rights and adds indemnification and limitation of liability terms.

During the three months ended March 31, 2026, the Company recognized $0.7 million of revenue from manufacturing services provided to Hanxin. During the three months ended March 31, 2025, the Company did not recognize revenue from manufacturing services provided to Hanxin. As of March 31, 2026, the Company had receivables of approximately $0.7 million from Hanxin under these agreements. As of December 31, 2025, the Company had an immaterial amount of receivables from Hanxin under these agreements.

*Contract Research Agreement with Hanxin*

The Company entered into various contract research agreements with Hanxin, a related party, whereby Hanxin will develop Recombinant Human Insulin Research Cell Banks and Recombinant Peptide Research Cell Banks, or RCBs, for the Company and license the RCBs to the Company subject to a fully paid, exclusive, perpetual, transferable, sub-licensable worldwide license. Hanxin will also perform scale-up manufacturing process development using the RCBs for the Company.

In March 2026, the Company amended the contract research agreement with Hanxin, whereby, the Company will use the RCBs that Hanxin develops to make Master Cell Banks for product candidates AMP-105, instead of AMP-107 as originally contemplated in the Contract Research Agreement. The total cost of the Contract Research Agreement will be increased by approximately $0.6 million, which reflects the additional work that Hanxin will need to perform and compensation to Hanxin for the work already provided for AMP-107.

During the three months ended March 31, 2026 and 2025, the Company paid an immaterial amount under this agreement. As of March 31, 2026 and December 31, 2025, the Company had an immaterial amount of payable to Hanxin under this agreement.

*Supply Agreement with Letop*

In November 2022, the Company entered into a supply agreement with Nanjing Letop Biotechnology Co., Ltd., or Letop, which is considered a related party due to an ownership stake of Henry Zhang. Under the terms of the supply agreement, Letop will manufacture and deliver chemical intermediates to the Company on a cost-plus basis. This agreement expired in the fourth quarter of 2025.

In March 2026, the Company entered into a new supply agreement with Letop, whereby Letop will manufacture and deliver chemical intermediates to the Company on a cost-plus basis. The agreement is effective for five years.

During the three months ended March 31, 2026 and 2025, the Company paid an immaterial amount under this agreement. As of March 31, 2026 and December 31, 2025, the Company did not have any additional accruals payable to Letop.

*Primatene MIST*<sup>®</sup> *Distribution Agreement with Hong Kong Genreach Limited*

In August 2024, the Company entered into a distribution agreement with Hong Kong Genreach Limited, or Genreach, a wholly owned subsidiary of Hanxin, a related party. Per the terms of the agreement, the Company has appointed Genreach as the exclusive distributor to market and sell Primatene MIST<sup>®</sup> in Mainland China, Taiwan, Hong Kong, and Macau in the Greater China region. Genreach will be responsible for obtaining any and all regulatory approvals in the region for Primatene MIST<sup>®</sup>.

In January 2026, the Company and Genreach amended the distribution agreement to expand the region of the distribution agreement to include the Middle East countries and Southeast Asia, as well as amending the annual minimum purchase

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**AMPHASTAR PHARMACEUTICALS, INC.**

**NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS**

**(Unaudited)**

[**Table of Contents**](#Toc)

amount.

The term of the agreement is for ten years, with both parties having termination rights without cause after the completion of the second contract year.

During the three months ended March 31, 2026 and 2025, the Company did not recognize any revenue from the distribution agreement with Genreach. As of March 31, 2026 and December 31, 2025, the Company did not have any receivables from Genreach.

*BAQSIMI*<sup>®</sup> *Distribution Agreement with Nanjing Chengong Pharmaceutical Co., Limited.*

In October 2025, the Company entered into a distribution agreement with Nanjing Chengong Pharmaceutical Co., Limited, or Chengong, a wholly-owned subsidiary of Hanxin, a related party. Per the terms of the agreement, the Company will collaborate with Chengong to expand distribution of BAQSIMI<sup>®</sup>, in Mainland China, Taiwan, Hong Kong, and Macau in the Greater China region, and appoint Chengong as the exclusive distributor to market and sell BAQSIMI<sup>®</sup> in the Greater China Region. Chengong is responsible for obtaining any and all regulatory approvals in the Region, and performing the required post marketing clinical trials for BAQSIMI<sup>®</sup>.

The term of the agreement is for ten years, with both parties having termination rights without cause after the completion

of the fourth contract year.

During the three months ended March 31, 2026, the Company did not recognize any revenue from the distribution agreement. As of March 31, 2026, the Company did not have any receivables from Chengong.

**Note 19. Litigation**

*Employee Litigation Matters*

On April 15, 2024, a former employee initiated an employment litigation against the Company by filing a complaint, as amended, having individual and class action claims for alleged violations of the California Labor Code pertaining to California's Private Attorneys General Act, or PAGA, wage and hour, and other state laws. This complaint was filed in the Superior Court of California for the County of Los Angeles. In the complaint, the plaintiff is seeking damages and related remedies under California law, as well as various penalty payments under the California Labor Code. In November 2024, the court ordered the plaintiff to dismiss the individual and class claims, with only the PAGA claim remaining. The Company intends to vigorously defend itself against the complaint.

On June 20, 2024, a former employee initiated an employment litigation against the Company and Roth Staffing Companies L.P. by filing a complaint having individual and class action claims for alleged violations of the California Labor Code pertaining to wage and hour, and other state laws. This complaint was filed in the Superior Court of California for the County of Los Angeles. In the complaint, the plaintiff is seeking damages and related remedies under California law, as well as various penalty payments under the California Labor Code. The Company intends to vigorously defend itself against the complaint.

On October 30, 2025, a former employee initiated a class action litigation against the Company by filing a complaint for alleged violations of the California Labor Code pertaining to California's PAGA, wage and hour, and other state laws. This complaint was filed in the Superior Court of California for the County of Los Angeles. In the complaint, the plaintiff is seeking damages and related remedies under California law, as well as various penalty payments under the California Labor Code. The Company intends to vigorously defend itself against the complaint.

During the three months ended March 31, 2026, the Company accrued $1.0 million related to the three employee litigations.

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**AMPHASTAR PHARMACEUTICALS, INC.**

**NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS**

**(Unaudited)**

[**Table of Contents**](#Toc)

*Other Litigation Matters*

The Company is subject to various claims, arbitrations, investigations, and lawsuits from time to time arising in the ordinary course of business. In addition, third parties may, from time to time, assert claims against the Company in the forms of letters and other communications.

The Company records a provision for contingent losses when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated. In the opinion of management, the ultimate resolution of any such matters is not expected to have a material adverse effect on its financial position, results of operations, or cash flows; however, the results of litigation and claims are inherently unpredictable and the Company's view of these matters may change in the future. Regardless of the outcome, litigation can have an adverse impact on the Company because of defense and settlement costs, diversion of management resources, and other factors.

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**ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS**

*The following is a discussion and analysis of the consolidated operating results, financial condition, liquidity and cash flows of our company as of and for the periods presented below. The following discussion and analysis should be read in conjunction with the "Condensed Consolidated Financial Statements" and the related notes thereto included in this Quarterly Report on Form 10-Q, or Quarterly Report. This discussion contains forward-looking statements that are based on the beliefs of our management, as well as assumptions made by, and information currently available to, our management. Actual results could differ materially from those discussed in or implied by forward-looking statements. These risks, uncertainties, and other factors include, among others, those identified under the "Special Note About Forward-Looking Statements," above and described in greater detail elsewhere in this Quarterly Report and in our Annual Report on Form 10-K for the year ended December 31, 2025, particularly in Item 1A. "Risk Factors".*

**Overview**

We are a biopharmaceutical company focusing on developing, manufacturing, and commercializing technically challenging generic and proprietary injectable, inhalation, and intranasal products, as well as active pharmaceutical ingredient, or API products. We currently manufacture and sell over 25 prescription pharmaceutical products, and one over-the-counter product, Primatene MIST<sup>®</sup>.

Our largest products by net revenues currently include BAQSIMI<sup>®</sup>, Primatene MIST<sup>®</sup>, epinephrine, glucagon, and lidocaine.

We are currently developing a portfolio of generic abbreviated new drug applications, or ANDAs, biologics license applications, or BLAs, including biosimilar insulin product candidates, and proprietary product candidates, which are in various stages of development and target a variety of indications. One ANDA and one biosimilar insulin candidate are currently on file with the FDA.

To complement our internal growth and expertise, we have in-licensed several early-stage proprietary products and have made several strategic acquisitions of companies, products and technologies. These acquisitions collectively have strengthened our core injectable and inhalation product technology infrastructure by providing additional manufacturing, marketing, and research and development capabilities, including the ability to manufacture raw materials, APIs, and other components for our products.

**Macroeconomic Trends and Uncertainties**

Recent worldwide events and macroeconomic factors, such as international trade relations, tariffs, new legislation and regulations, changes in administration, taxation or monetary policy changes, public sector budgetary cycles and funding authorization in the United States, political and civil unrest, global conflicts, supply chain disruptions, heightened inflationary pressures, and fluctuating interest rates, as well as rising healthcare costs among other factors, also increase volatility in the global economy and continue to pose challenges to our business. For example, there is significant uncertainty relating to tariffs. While all of our finished products and four of our APIs are manufactured in the United States, we import APIs, starting materials for APIs, and components from various countries.

See the section titled "Risk Factors" in our Annual Report on Form 10-K for the year ended December 31, 2025, for further discussion of the potential adverse impact of unfavorable global and geopolitical economic conditions on our business, results of operations and financial conditions.

**Recent Developments**

In January 2026, we entered into a License Agreement with Nanjing Hanxin Pharmaceutical Technology Co., Ltd., or Hanxin, pursuant to which Hanxin has granted an exclusive license to a fully synthetic corticotropin (ACTH) analog, now designated AMP-110, in the United States and Canada. AMP-110 is designed to address inflammatory and autoimmune conditions with a potentially improved safety profile compared to porcine-derived ACTH products. In January 2026, we made an upfront payment of $2.0 million to Hanxin upon signing the License Agreement. The agreement is also subject to potential development milestone payments, as well as sales milestone and royalty payments.

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For more information regarding the Hanxin license agreement, see "Part I – Item 1. Financial Statements (unaudited) – Notes to Condensed Consolidated Financial Statements – Note 17. Commitments and Contingencies."

In February 2026, the FDA approved our Ipratropium Bromide HFA inhalation aerosol, 17 mcg/actuation, which we launched in April 2026.

**Business Segments**

Our performance is assessed and resources are allocated based on one reportable segment, pharmaceutical products.

For more information regarding our segments, see "Part I – Item 1. Financial Statements (unaudited) – Notes to Condensed Consolidated Financial Statements – Note 5. Segment Reporting."

**Results of Operations**

***Three Months Ended March 31, 2026 compared to Three Months Ended March 31, 2025***

**Net revenues**

---

| | | | | |
|:---|:---|:---|:---|:---|
|  | **Three Months Ended**  | **Three Months Ended**  |  |  |
|  | **March 31,**  | **March 31,**  | **Change** | **Change** |
|  | **2026** | **2025** | **Dollars** | **%** |
|  | **(in thousands)** | **(in thousands)** | **(in thousands)** |  |
| Net revenues | $171171 | $170528 | $643 | 0% |
| Cost of revenues | $100849 | $85277 | $15572 | 18% |
| Gross profit | $70322 | $85251 | $(14929) | (18)% |
| *as % of net revenues* | *41*<br>*%*  | *50*<br>*%*  |  |  |

---

The following table summarizes our revenue by product for the three months ended March 31, 2026 and 2025:

---

| | | | | |
|:---|:---|:---|:---|:---|
|  | **Three Months Ended**  | **Three Months Ended**  |  |  |
|  | **March 31,**  | **March 31,**  | **Change** | **Change** |
|  | **2026** | **2025** | **Dollars** | **%** |
|  | **(in thousands)** | **(in thousands)** | **(in thousands)** |  |
| Net revenues: |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;BAQSIMI<sup>®</sup> | $32434 | $38355 | $(5921) | (15)% |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Primatene MIST<sup>®</sup> | 29763 | 29051 | 712 | 2% |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Epinephrine | 19213 | 18587 | 626 | 3% |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Lidocaine | 13460 | 13644 | (184) | (1)% |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Glucagon | 9170 | 20843 | (11673) | (56)% |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Other products | 67131 | 50048 | 17083 | 34% |
| Total net revenues  | $171171 | $170528 | $643 | 0% |

---

The decrease in sales of BAQSIMI<sup>®</sup> was primarily due to a lower average selling price, as a result of a change in gross-to-net discounts due to changes in chargebacks and rebates and changes to the customer mix, impacting sales of approximately $8.0 million. This decrease was partially offset by an increase in unit volumes, contributing $2.0 million in sales driven by our continued marketing efforts. Primatene MIST<sup>®</sup> sales increased primarily due to an increase in unit volumes. The increase in sales of epinephrine was due to an increase in demand for our epinephrine pre-filled syringe, as a result of other supplier shortages, contributing $4.1 million in sales. This increase was partially offset by a decrease in our epinephrine multi-dose vial product, as a result increased competition, impacting sales by $3.5 million. The decrease in sales of glucagon was due to a decrease in unit volumes, impacting sales by $6.1 million, as well as a lower average selling price, which impacted sales by $5.6 million, as a result of increased competition and the continued shift to ready to use glucagon products such as BAQSIMI<sup>®</sup>. The increase in other products was primarily due to recently launched products including an increase in albuterol sales of $2.8 million, iron sucrose sales of $1.4 million and teriparatide sales of $2.2 million, which were launched in August 2024, August 2025, and December 2025, respectively. An increase in API sales and an increase in dextrose sales as a result of an increase in demand caused by other supplier shortages, also

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positively impacted sales.

We anticipate that sales of glucagon will continue to decline in the future due to competitive dynamics. We also anticipate that sales of epinephrine and other products will continue to fluctuate depending on the ability of our competitors to supply market demands.

*Backlog*

A significant portion of our customer shipments in any period relate to orders received and shipped in the same period, generally resulting in low product backlog relative to total shipments at any time. We had no significant backlog as of March 31, 2026. Historically, our backlog has not been a meaningful indicator in any given period of our ability to achieve any particular level of overall revenue or financial performance.

**Gross Margins**

The decrease in gross margins was impacted by lower average selling prices for our higher margin products, such as BAQSIMI<sup>®</sup>, glucagon, phytonadione, and epinephrine multi-dose vials. Additionally, our manufacturing expenses increased due to the expansion of our manufacturing facilities in Rancho Cucamonga, CA.

**Selling, distribution, and marketing, and general and administrative**

---

| | | | | |
|:---|:---|:---|:---|:---|
|  | **Three Months Ended**  | **Three Months Ended**  |  |  |
|  | **March 31,**  | **March 31,**  | **Change** | **Change** |
|  | **2026** | **2025** | **Dollars** | **%** |
|  | **(in thousands)** | **(in thousands)** | **(in thousands)** |  |
| Selling, distribution, and marketing | $11927 | $11866 | $61 | 1% |
| General and administrative | $18028 | $15996 | $2032 | 13% |

---

The increase in general and administrative expenses was primarily due to an increase in legal expense, expenses associated with implementing a new ERP system and salary and personnel-related expenses.

Legal fees may fluctuate from period to period due to the timing of patent challenges and other litigation matters.

**Research and development**

---

| | | | | |
|:---|:---|:---|:---|:---|
|  | **Three Months Ended**  | **Three Months Ended**  |  |  |
|  | **March 31,**  | **March 31,**  | **Change** | **Change** |
|  | **2026** | **2025** | **Dollars** | **%** |
|  | **(in thousands)** | **(in thousands)** | **(in thousands)** |  |
| Salaries and personnel-related expenses | $10372 | $9061 | $1311 | 14% |
| Clinical trials | 1552 | 948 | 604 | 64% |
| FDA fees | 15 | 1485 | (1470) | (99)% |
| Materials and supplies | 5445 | 2828 | 2617 | 93% |
| Depreciation | 3834 | 3175 | 659 | 21% |
| Other expenses<sup>(1)</sup> | 5519 | 2599 | 2920 | 112% |
| Total research and development expenses | $26737 | $20096 | $6641 | 33% |

---

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1) Includes the upfront payment of $2.0 million relating to the licensing agreement with Hanxin.

Research and development expenses consist primarily of costs associated with the research and development of our product candidates including the cost of developing APIs. We expense research and development costs as incurred.

Research and development expenses increased primarily due to spending for our insulin, inhalation, and proprietary pipeline products. Additionally, we made a $2.0 million upfront payment for the licensing agreement that we entered into with Hanxin during the quarter.

We have made, and expect to continue to make, substantial investments in research and development to expand our product portfolio and grow our business. We expect that research and development expenses will increase on an annual

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basis due to increased clinical trials costs related to our proprietary, insulin and inhalation product candidates. These expenditures will include costs of APIs developed internally as well as APIs purchased externally for use in research and development, the cost of purchasing reference listed drugs and the costs of performing the clinical trials. As we undertake new and challenging research and development projects, we anticipate that the associated costs will increase significantly over the next several quarters and years.

**Non-operating expenses, net**

---

| | | | | |
|:---|:---|:---|:---|:---|
|  | **Three Months Ended**  | **Three Months Ended**  |  |  |
|  | **March 31,**  | **March 31,**  | **Change** | **Change** |
|  | **2026** | **2025** | **Dollars** | **%** |
|  | **(in thousands)** | **(in thousands)** | **(in thousands)** |  |
| Non-operating expenses: |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Interest income | $2400 | $2089 | $311 | 15% |
| &nbsp;&nbsp;&nbsp;&nbsp;Interest expense | (6553) | (6286) | (267) | 4% |
| &nbsp;&nbsp;&nbsp;&nbsp;Other income (expenses), net | 575 | (2234) | 2809 | 126% |
| Total non-operating expenses, net | $(3578) | $(6431) | $2853 | (44)% |

---

The change in non-operating expenses, net is primarily a result of foreign currency fluctuation, as well as mark-to-market adjustments relating to our interest rate swap contract during the three months ended March 31, 2026.

**Income tax provision**

---

| | | | | |
|:---|:---|:---|:---|:---|
|  | **Three Months Ended**  | **Three Months Ended**  |  |  |
|  | **March 31,**  | **March 31,**  | **Change** | **Change** |
|  | **2026** | **2025** | **Dollars** | **%** |
|  | **(in thousands)** | **(in thousands)** | **(in thousands)** |  |
| Income tax provision | $3632 | $5577 | $(1945) | (35)% |
| &nbsp;&nbsp;*Effective tax rate* | *36*<br>*%*  | *18*<br>*%*  |  |  |

---

Our effective tax rate for the three months ended March 31, 2026 increased in comparison to the three months ended March 31, 2025, primarily due to timing of discrete tax items. For more information regarding our income taxes, see "Part I – Item 1. Financial Statements (unaudited) – Notes to Condensed Consolidated Financial Statements – Note 14. Income Taxes."

**Liquidity and Capital Resources** 

***Cash Requirements and Sources***

We need capital resources to maintain and expand our business. We expect our cash requirements to increase significantly as we sponsor clinical trials for, seek regulatory approvals of, and develop, manufacture and market our current development stage product candidates and pursue strategic acquisitions of businesses or assets. Our future capital expenditures include projects to upgrade, expand, and improve our manufacturing facilities in the United States and China, including a significant increase in capital expenditures over the next few years. We plan to fund this facility expansion with cash flows from operations.

Our cash obligations include the principal and interest payments due on our existing loans, and finance and operating lease payments. In addition, upon the achievement of various development, regulatory and commercial milestones for agreements, we have entered into with third parties, we are contractually obligated to pay additional amounts that, in the aggregate, are significant. These payments are contingent upon the occurrence of various future events, substantially all of which have a high degree of uncertainty of occurring, and any resulting cash requirements are managed through our operating budgeting processes. These obligations are not recorded on our condensed consolidated balance sheets. As of March 31, 2026, the maximum amount that may be payable in the future for agreements we have entered into with third parties is approximately $1.1 billion. These obligations are described further throughout this Quarterly Report.

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As of March 31, 2026, our foreign subsidiaries collectively held $12.3 million in cash and cash equivalents. Cash or cash equivalents held at foreign subsidiaries are not available to fund the parent company's operations in the United States. We believe that our cash reserves, operating cash flows, and borrowing availability under our credit facilities will be sufficient to fund our operations for at least the next 12 months from the filing of this Quarterly Report on Form 10-Q. We expect additional cash flows to be generated in the longer term from future product launches, although there can be no assurance as to the receipt of regulatory approval for any product candidates that we are developing or the timing of any product launches, which could be lengthy or ultimately unsuccessful.

Working capital decreased $8.7 million to $469.2 million at March 31, 2026, compared to $477.9 million at December 31, 2025.

***Cash Flows from Operations***

The following table summarizes our cash flows provided by and used in operating, investing, and financing activities for the three months ended March 31, 2026 and 2025:

---

| | | |
|:---|:---|:---|
|  | **Three Months Ended March 31,**  | **Three Months Ended March 31,**  |
|  | **2026** | **2025** |
|  | **(in thousands)**  | **(in thousands)**  |
| **Statement of Cash Flow Data:** |  |  |
| &nbsp;&nbsp;Net cash provided by (used in) |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Operating activities | $47840 | $35077 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Investing activities | (16733) | 10481 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Financing activities | (30207) | (14503) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Effect of exchange rate changes on cash | (138) | 118 |
| &nbsp;&nbsp;Net increase in cash, cash equivalents, and restricted cash | $762 | $31173 |

---

*Sources and Use of Cash*

Operating Activities

Net cash provided by operating activities was $47.8 million for the three months ended March 31, 2026, which included net income of $6.4 million. Non-cash items comprised primarily of $17.3 million of depreciation and amortization, which includes $8.1 million related to depreciation of property, plant and equipment; $6.3 million related to amortization of intangible assets; $2.1 million related to amortization of operating lease right-of-use assets; $0.8 million related to amortization of discounts, premiums, and debt issuance costs; and share-based compensation expense of $9.3 million.

Additionally, for the three months ended March 31, 2026, there was a net cash inflow from changes in operating assets and liabilities of $15.3 million, which resulted primarily from increases in accounts payable and accrued liabilities, as well as a decrease in inventories, which was partially offset by an increase in accounts receivable. Accounts payable and accrued liabilities increased primarily due to the timing of payments. The increase in accounts receivables was primarily due to the timing of sales.

Net cash provided by operating activities was $35.1 million for the three months ended March 31, 2025, which included net income of $25.3 million. Non-cash items comprised primarily of $16.0 million of depreciation and amortization, which includes $7.4 million related to depreciation of property, plant and equipment; $6.2 million related to amortization of intangible assets; $1.6 million related to amortization of operating lease right-of-use assets; $0.8 million related to amortization of discounts, premiums, and debt issuance costs; and share-based compensation expense of $8.4 million. Additionally, for the three months ended March 31, 2025, there was a net cash outflow from changes in operating assets and liabilities of $16.7 million, which resulted primarily from an increase in accounts receivables and an increase in inventories, which was partially offset by an increase in accounts payable and accrued liabilities. The increase in accounts receivables was primarily due to the timing of sales in the quarter. The increase in inventories was primarily due to the increased purchases of finished product, raw materials and components for BAQSIMI<sup>®</sup>, as we assumed full responsibility for the supply chain from Lilly. Accounts payable and accrued liabilities increased primarily due to the increase in accrued customer fees and rebates associated with BAQSIMI<sup>®</sup> sales.

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Investing Activities

Net cash used in investing activities was $16.7 million for the three months ended March 31, 2026, primarily as a result of $9.5 million in purchases of property, plant, and equipment, which included $4.5 million incurred in the United States, $0.8 million in France, and $4.2 million in China, as well as a net cash outflow of $7.3 million from sales and purchases of investments during the period.

Net cash provided by investing activities was $10.5 million for the three months ended March 31, 2025, primarily as a result of $21.2 million from sales and purchases of investments during the quarter. This was partially offset by $10.7 million in purchases of property, plant, and equipment, which included $7.8 million incurred in the United States, $0.6 million in France, and $2.3 million in China.

Financing Activities

Net cash used in financing activities was $30.2 million for the three months ended March 31, 2026, primarily as a result of $29.5 million used to purchase treasury stock and a net of $0.7 million used to settle share-based compensation awards under our equity plan.

Net cash used in financing activities was $14.5 million for the three months ended March 31, 2025, primarily as a result of $11.0 million used to purchase treasury stock and a net of $4.7 million used to settle share-based compensation awards under our equity plan and for tax payments related to the net share settlement of options exercised. This was partially offset by $1.6 million of net proceeds from borrowings on our line of credit in China.

***Indebtedness***

For more information regarding our outstanding indebtedness, see "Part I – Item 1. Financial Statements – Notes to Condensed Consolidated Financial Statements – Note 13. Debt".

**Critical Accounting Policies**

The preparation of our condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and notes to the financial statements. Some of those judgments can be subjective and complex, and therefore, actual results could differ materially from those estimates under different assumptions or conditions. A summary of our critical accounting policies is presented in Part II, Item 7, of our Annual Report on Form 10-K for the year ended December 31, 2025. There have been no material changes to our critical accounting policies as compared to the critical accounting policies as described in our Annual Report on Form 10-K for the year ended December 31, 2025.

**Recent Accounting Pronouncements**

For information regarding recent accounting pronouncements, see "Part I – Item 1. Financial Statements – Notes to Condensed Consolidated Financial Statements – Note 2. Summary of Significant Accounting Policies".

**Government Regulation**

Our products and facilities are subject to regulation by a number of federal and state governmental agencies. The FDA, in particular, maintains oversight of the formulation, manufacture, distribution, packaging, and labeling of all of our products. The Drug Enforcement Administration, or DEA, maintains oversight over our products that are considered controlled substances.

Our manufacturing facilities as well as our CMOs are subject to periodic inspection by the FDA to ensure that they are operating in compliance with cGMP requirements.

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**ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURE ABOUT MARKET RISK**

Except for the broad, ongoing macroeconomic challenges facing the global economy and financial markets, there have been no material changes in market risk from the information provided in our Annual Report on Form 10-K for the year ended December 31, 2025. We are exposed to market risk in the ordinary course of business. Market risk represents the potential loss arising from adverse changes in the value of financial instruments. The risk of loss is assessed based on the likelihood of adverse changes in fair values, cash flows or future earnings. We are exposed to market risk for changes in the market values of our investments (Investment Risk), the impact of interest rate changes (Interest Rate Risk), and the impact of foreign currency exchange rate changes (Foreign Currency Exchange Risk).

**ITEM 4. CONTROLS AND PROCEDURES**

***Evaluation of Disclosure Controls and Procedures***

Our management, under the supervision and with the participation of our Chief Executive Officer and our Chief Financial Officer, our principal executive and principal financial officers, respectively, conducted an evaluation of the effectiveness of the design and operation of our disclosure controls and procedures, as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended, or the Exchange Act, as of the end of the period covered by this Quarterly Report on Form 10-Q. Based on this evaluation, our Chief Executive Officer and our Chief Financial Officer have concluded that our disclosure controls and procedures were effective (a) to ensure that information that we are required to disclose in reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in SEC rules and forms and (b) to include, without limitation, controls and procedures designed to ensure that information required to be disclosed by us in reports filed or submitted under the Exchange Act is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure.

***Changes in Internal Control Over Financial Reporting***

There have been no changes in our internal control over financial reporting that occurred during the quarter ended March 31, 2026, that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act).

***Inherent Limitations of Internal Controls***

Our management, including our Chief Executive Officer and Chief Financial Officer, does not expect that our disclosure controls and procedures or our internal controls over financial reporting will prevent or detect all errors and all fraud. A control system, no matter how well designed and operated, can provide only reasonable, not absolute, assurance that the objectives of the control system are met. Because of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that all control issues and instances of fraud, if any, within the Company have been detected. These inherent limitations include the realities that judgments in decision-making can be faulty, and that breakdowns can occur because of a simple error or mistake. Additionally, controls can be circumvented by the individual acts of some persons, by collusion of two or more people, or by management overriding of the controls. The design of any system of controls also is based in part upon certain assumptions about the likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated goals under all potential future conditions. Over time, controls may become inadequate because of changes in conditions, or the degree of compliance with the policies or procedures may deteriorate. Because of the inherent limitations in a cost-effective control system, misstatements due to error or fraud may occur and not be detected.

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**PART II. OTHER INFORMATION**

**ITEM 1. LEGAL PROCEEDINGS**

For information regarding legal proceedings, see "Part I – Item 1. Financial Statements – Notes to Condensed Consolidated Financial Statements – Note 19. Litigation."

**ITEM 1A. RISK FACTORS**

Except as noted below, there were no material changes from the risk factors previously disclosed in our Annual Report on Form 10-K for the year ended December 31, 2025, filed with the SEC on February 26, 2026.

***We must manufacture our drug products at our facilities in conformity with cGMP regulations; failure to maintain compliance with cGMP regulations may prevent or delay the manufacture or marketing of our products or product candidates and may prevent us from gaining approval of our products.***

All of our products and product candidates for use in clinical studies must be manufactured, packaged, labeled and stored in accordance with cGMP. For our approved products, modifications, enhancements, or changes in manufacturing processes and sites may require supplemental FDA approval, which may be subject to a lengthy application process or which we may be unable to obtain.

All facilities of Amphastar, our subsidiaries and our CMOs and suppliers are periodically subject to inspection by the FDA and other governmental entities, and operations at these facilities could be interrupted or halted if the FDA or another governmental entity deems such inspections as unsatisfactory. For example, our facilities in Rancho Cucamonga, CA, South El Monte, CA, Canton, MA, Éragny Sur Epte, France, and Nanjing, China are subject to FDA cGMP inspections as well as pre-approval, routine and other inspections by the FDA, state, and other regulatory authorities and may be again in the future per applicable law. Our facility in South El Monte, CA was inspected by the FDA in December 2025, and we responded to the Form 483 observations in January 2026. Subsequently, in April 2026, the FDA notified us that the facility would be classified as "Official Action Indicated." We have undertaken corrective actions to address the observations noted in the Form FDA 483 and do not anticipate any interruption that could have a material adverse effect on Amphastar and its operations.

Compliance with cGMP standards requires substantial expenditures of time, money and effort in such areas as production and quality control to ensure full technical compliance. Failure to comply with cGMP or with other state, federal, or foreign requirements may result in unanticipated compliance expenditures, total or partial suspension of production or distribution, suspension of review of applications submitted for approval of our product candidates, termination of ongoing research, disqualification of data derived from studies on our products and/or enforcement actions such as recall or seizure of products, injunctions, civil penalties and criminal prosecutions of the company and company officials. There can be no assurance that we will be able to remedy any deficiencies cited by FDA or other regulatory agencies in their inspections.

***Jack Y. Zhang and Mary Z. Luo have each pledged shares of our common stock to secure funds borrowed under existing credit lines from three financial institutions. Each of the lenders has varying rights as a lender, including one which has the right to conduct a forced sale at its sole discretion. An action by one of the lenders could include a sale of certain shares of our common stock pledged as collateral, the sale of which could cause the price of our common stock to decline. An action to cure and cover indebtedness by any one of the lenders could also have other negative impacts on our business.***

Jack Y. Zhang and Mary Z. Luo have each pledged shares of our common stock to secure funds borrowed under existing credit lines by UBS Group and its affiliates, or UBS, East West Bank, or East West, and Cathay Bank. As of March 31, 2026, UBS had extended combined credit lines of $15.0 million to Applied Physics & Chemistry Laboratories, Inc., or APCL, which is controlled by Dr. Zhang and Dr. Luo, East West had agreed to a loan of up to $12.0 million to Drs. Zhang and Luo, and Cathay Bank had agreed to a loan of up to $30.0 million to APCL and Dr. Luo. The UBS credit lines are secured by a pledge of 1,500,000 shares of our common stock currently held by APCL, the East West loan is secured by a pledge of 1,200,000 shares of our common stock held by APCL and Dr. Zhang, and the Cathay Bank loan is secured by a pledge of 3,000,000 shares of our common stock held by APCL and Dr. Luo. Interest on each of these

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loans accrues at market rates. UBS has an unlimited and unilateral right to call each of the credit lines for any reason whatsoever, and each of East West and Cathay Bank has acceleration rights to protect itself in the event of a default.

We have a pledging policy to restrict the pledging of shares by our executive officers and directors, which was created in 2021 and most recently amended in 2026. The policy prohibits our executive officers and directors from entering into any transaction whereby the executive officer or director, directly or indirectly, pledges, hypothecates, or otherwise encumbers more than sixty (60) percent of shares of common stock held by the individual or more than fifteen (15) percent of our total outstanding shares of common stock as of the date of the transaction, whichever is lower, as collateral for indebtedness. This restriction extends to any hedging or similar transaction designed to decrease the risks associated with holding our securities.

While we are not a party to these loans, which are full recourse against APCL and each of Drs. Zhang and Luo, respectively, and are secured by pledges of a portion of the shares of our common stock currently held by APCL and each of Drs. Zhang and Luo, if the price of our common stock declines, Drs. Zhang and Luo may be forced by these financial institutions to provide additional collateral for the loans or to sell shares of our common stock held by them in order to remain within the margin limitations imposed under the terms of their loans. Furthermore, the pledged shares of our common stock may be acquired and sold by the lenders. These factors may limit Drs. Zhang and Luo's ability to either pledge additional shares of our common stock or sell shares of our common stock held by them as a means to avoid or satisfy a margin call with respect to their pledged shares of our common stock in the event of a decline in our stock price that is large enough to trigger a margin call. Any significant sales of shares of our common stock by one or more of these three lenders could cause the price of our common stock to decline further.

**ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS**

**(c)** **Issuer Purchases of Equity Securities**

The table below provides information with respect to repurchases of our common stock.

---

| | | | | |
|:---|:---|:---|:---|:---|
| <br>**Period** | <br>**Total Number of Shares**<br>**Purchased** | <br>**Average**<br>**Price Paid**<br>**per Share** | <br>**Total Number of Shares**<br>**Purchased as Part of**<br>**Publicly Announced Plans**<br>**or Programs**<sup>(1)</sup> | **Approximate Dollar Value of**<br>**Shares that May Yet Be**<br>**Purchased Under the Plans**<br>**or Programs**<sup>(1)</sup><br>**(in millions)** |
| January 1 - January 31, 2026 | 185440 | $26.94 | 185440 | $19.6 |
| February 1 - February 28, 2026 | 168399 | 28.18 | 168399 | 14.9 |
| March 1 - March 31, 2026 | 1019506 | 19.34 | 1019506 | 45.1 |

---

&nbsp;&nbsp;&nbsp;&nbsp;(1) These repurchases were made under our previously authorized share buyback program (see "Part I – Item. 1. Financial Statements – Notes to the Condensed Consolidated Financial Statements – Note 15. Stockholders' Equity – Share Buyback Program"). The share buyback program does not have an expiration date .

**ITEM 3. DEFAULTS UPON SENIOR SECURITIES**

Not applicable.

**ITEM 4. MINE SAFETY DISCLOSURES**

Not applicable.

**ITEM 5. OTHER INFORMATION**

*Securities Trading Plans of Directors and Executive Officers*

During our last fiscal quarter, the following officer and director, as defined in Rule 16a-1(f), adopted a Rule 10b5-1 trading arrangement, as defined in Regulation S-K Item 408, as follows:

On March 10, 2026, William J. Peters, our Chief Financial Officer, Executive Vice President of Finance, and Treasurer,

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President of International Medication Systems, Limited, and Director, adopted a Rule 10b5-1 trading arrangement providing for the sale from time to time of an aggregate of up to 115,281 shares of our common stock. The trading arrangement is intended to satisfy the affirmative defense in Rule 10b5-1(c). The duration of the trading arrangement is until March 31, 2027, or earlier if all transactions under the trading arrangement are completed.

No other officers or directors, as defined in Rule 16a-1(f), adopted or terminated a Rule 10b5-1 trading arrangement, or a non-Rule 10b5-1 trading arrangement, each as defined in Regulation S-K Item 408.

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**ITEM 6. EXHIBITS**

---

| | |
|:---|:---|
| **ExhibitNo.** | **Description** |
| 10.1\* | [License Agreement by and between Amphastar Pharmaceuticals, Inc., and Nanjing Hanxin Pharmaceutical Technology Co., Ltd., dated January 6, 2026 (incorporated by reference to Exhibit 10.35 to the Company's Annual Report on Form 10-K filed with the SEC on February 26, 2026)](https://www.sec.gov/Archives/edgar/data/1297184/000129718426000009/amph-20251231xex10d35.htm) |
| 10.2\* | [Third Amendment to the Contract Manufacturing Agreement by and between Amphastar Nanjing Pharmaceutical, Inc., and Nanjing Hanxin Pharmaceutical Technology Co., Ltd, dated January 6, 2026 (incorporated by reference to Exhibit 10.36 to the Company's Annual Report on Form 10-K filed with the SEC on February 26, 2026)](https://www.sec.gov/Archives/edgar/data/1297184/000129718426000009/amph-20251231xex10d36.htm) |
| 10.3\* | [First Amendment to the Distribution Agreement by and between Armstrong Pharmaceuticals, Inc. and Hong Kong Genreach Limited, dated January 6, 2026 (incorporated by reference to Exhibit 10.37 to the Company's Annual Report on Form 10-K filed with the SEC on February 26, 2026)](https://www.sec.gov/Archives/edgar/data/1297184/000129718426000009/amph-20251231xex10d37.htm) |
| 10.4\* | [Supply Agreement by and between Amphastar Nanjing Pharmaceuticals, Inc. and Nanjing Letop Biotechnology Co., Ltd., dated March 3, 2026 (incorporated by reference to Exhibit 10.1 of the Company's Current Report on Form 8-K filed with the SEC on March 6, 2026)](https://www.sec.gov/Archives/edgar/data/1297184/000129718426000013/amph-20260303xex10d1.htm) |
| 10.5\* | [First Amendment to the Contract Research Agreement by and between Amphastar Pharmaceuticals, Inc. and Nanjing Hanxin Pharmaceutical Technology Co., Ltd., dated March 3, 2026 (incorporated by reference to Exhibit 10.2 of the Company's Current Report on Form 8-K filed with the SEC on March 6, 2026)](https://www.sec.gov/Archives/edgar/data/1297184/000129718426000013/amph-20260303xex10d2.htm) |
| 10.6 | [Form of Employment Agreement for Jacob Liawatidewi and Rong Zhou (incorporated by reference to Exhibit 10.1 of the Company's Current Report on Form 8-K filed with the SEC on March 6, 2026)](https://www.sec.gov/Archives/edgar/data/1297184/000129718426000015/amph-20260303xex10d1.htm) |
| 31.1 | [Certification of the Principal Executive Officer pursuant to Rule 13a-14(a) or 15d-14a of the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002](amph-20260331xex31d1.htm) |
| 31.2 | [Certification of the Principal Financial Officer pursuant to Rule 13a-14(a) or 15d-14a of the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002](amph-20260331xex31d2.htm) |
| 32.1# | [Certification of Principal Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002](amph-20260331xex32d1.htm) |
| 32.2# | [Certification of Principal Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002](amph-20260331xex32d2.htm) |
| 101.INS | XBRL Instance Document – The instance document does not appear in the interactive data file because its XBRL tags are embedded within the Inline XBRL document |
| 101.SCH | Inline XBRL Taxonomy Extension Schema Document |
| 101.CAL | Inline XBRL Taxonomy Extension Calculation Linkbase Document |
| 101.LAB | Inline XBRL Taxonomy Extension Label Linkbase Document |
| 101.PRE | Inline XBRL Taxonomy Extension Presentation Linkbase Document |
| 101.DEF | Inline XBRL Taxonomy Extension Definitions Linkbase Document |
| 104 | Cover Page Interactive File (Formatted as Inline XBRL and contained in Exhibit 101) |

---

# The information in Exhibits 32.1 and 32.2 shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of that section, nor shall they be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act (including this Report), unless the Registrant specifically incorporates the foregoing information into those documents by reference.

\* Portions of this exhibit (indicated by asterisks) have been redacted in compliance with Regulation S-K Item 601(b)(10).

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**SIGNATURES**

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

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| | |
|:---|:---|
|  | **AMPHASTAR PHARMACEUTICALS, INC.**(Registrant) |
| By: | **/s/ JACK Y. ZHANG** |
|  | Jack Y. Zhang |
|  | Chief Executive Officer<br>(Principal Executive Officer) |

---

Date: May 7, 2026

---

| | |
|:---|:---|
|  | **AMPHASTAR PHARMACEUTICALS, INC.**(Registrant) |
| By: | **/s/ WILLIAM J. PETERS** |
|  | William J. Peters |
|  | Chief Financial Officer<br>(Principal Financial and Accounting Officer) |

---

Date: May 7, 2026

*-43-*

## Exhibit 31.1

**Exhibit 31.1**

**CERTIFICATION PURSUANT TO RULE 13a-14(a) OR 15d-14a OF**

**THE SECURITIES EXCHANGE ACT OF 1934**

**AS ADOPTED PURSUANT TO SECTION 302**

**OF THE SARBANES OXLEY ACT OF 2002**

I, Jack Y. Zhang, Ph.D., certify that:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1. I have reviewed this Quarterly Report on Form 10-Q of Amphastar Pharmaceuticals, Inc.;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have :

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

---

| | | |
|:---|:---|:---|
| Date: May 7, 2026 | By: | **/s/ JACK Y. ZHANG** |
|  |  | Jack Y. Zhang |
|  |  | Chief Executive Officer |
|  |  | (Principal Executive Officer) |

---

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## Exhibit 31.2

**Exhibit 31.2**

**CERTIFICATION PURSUANT TO RULE 13a-14(a) OR 15d-14a OF**

**THE SECURITIES EXCHANGE ACT OF 1934**

**AS ADOPTED PURSUANT TO SECTION 302**

**OF THE SARBANES OXLEY ACT OF 2002**

I, William J. Peters, certify that:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1. I have reviewed this Quarterly Report on Form 10-Q of Amphastar Pharmaceuticals, Inc.;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

---

| | | |
|:---|:---|:---|
| Date: May 7, 2026 | By: | **/s/ WILLIAM J. PETERS** |
|  |  | William J. Peters |
|  |  | Chief Financial Officer |
|  |  | (Principal Financial and Accounting Officer) |

---

------

## Exhibit 32.1

**Exhibit 32.1**

**CERTIFICATIONS OF PRINCIPAL EXECUTIVE OFFICER**

**PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906**

**OF THE SARBANES-OXLEY ACT OF 2002**

The undersigned officer of Amphastar Pharmaceuticals, Inc. (the "Company"), hereby certifies, to the best of such officer's knowledge, that:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) the Quarterly Report on Form 10-Q of the Company for the quarter ended March 31, 2026 (the "Report") fully complies with the requirements of Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934 and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company at the dates and for the periods indicated.

---

| | | |
|:---|:---|:---|
| Date: May 7, 2026 | By: | **/s/ JACK Y. ZHANG** |
|  |  | Jack Y. Zhang |
|  |  | Chief Executive Officer |
|  |  | (Principal Executive Officer) |

---

The foregoing certification is being furnished solely to accompany the Report pursuant to 18 U.S.C. §1350, and is not being filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and is not to be incorporated by reference into any filing of the Company, whether made before or after the date hereof, regardless of any general incorporation language in such filing.

------

## Exhibit 32.2

**Exhibit 32.2**

**CERTIFICATIONS OF PRINCIPAL FINANCIAL OFFICER**

**PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906**

**OF THE SARBANES-OXLEY ACT OF 2002**

The undersigned officer of Amphastar Pharmaceuticals, Inc. (the "Company"), hereby certifies, to the best of such officer's knowledge, that:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) the Quarterly Report on Form 10-Q of the Company for the quarter ended March 31, 2026 (the "Report") fully complies with the requirements of Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934 and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company at the dates and for the periods indicated.

---

| | | |
|:---|:---|:---|
| Date: May 7, 2026 | By: | **/s/ WILLIAM J. PETERS** |
|  |  | William J. Peters |
|  |  | Chief Financial Officer |
|  |  | (Principal Financial and Accounting Officer) |

---

The foregoing certification is being furnished solely to accompany the Report pursuant to 18 U.S.C. §1350, and is not being filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and is not to be incorporated by reference into any filing of the Company, whether made before or after the date hereof, regardless of any general incorporation language in such filing.

------