# EDGAR Filing Document

**Accession Number:** 0001326190
**File Stem:** 0001326190-26-000037
**Filing Date:** 2026-5
**Character Count:** 21494
**Document Hash:** dbea6a4bc75aeb4d85b17940b4b58da1
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001326190-26-000037.hdr.sgml**: 20260513

**ACCESSION NUMBER**: 0001326190-26-000037

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 12

**CONFORMED PERIOD OF REPORT**: 20260513

**ITEM INFORMATION**: Results of Operations and Financial Condition

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20260513

**DATE AS OF CHANGE**: 20260513

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Altimmune, Inc.
- **CENTRAL INDEX KEY:** 0001326190
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 202726770
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-32587
- **FILM NUMBER:** 26970954

**BUSINESS ADDRESS:**
- **STREET 1:** 910 CLOPPER ROAD
- **STREET 2:** SUITE 201S
- **CITY:** GAITHERSBURG
- **STATE:** MD
- **ZIP:** 20878
- **BUSINESS PHONE:** 2406541450

**MAIL ADDRESS:**
- **STREET 1:** 910 CLOPPER ROAD
- **STREET 2:** SUITE 201S
- **CITY:** GAITHERSBURG
- **STATE:** MD
- **ZIP:** 20878

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** PHARMATHENE, INC
- **DATE OF NAME CHANGE:** 20071016

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** HEALTHCARE ACQUISITION CORP
- **DATE OF NAME CHANGE:** 20050505

?xml version='1.0' encoding='ASCII'? ALTIMMUNE, INC._May 13, 2026

**UNITED STATESSECURITIES AND EXCHANGE COMMISSION**

**Washington, DC 20549**

**FORM 8-K**

**CURRENT REPORT**

**Pursuant to Section 13 or 15(d)of The Securities Exchange Act of 1934**

**Date of Report (Date of earliest event reported): May 13, 2026**

## ALTIMMUNE, INC.
**(Exact name of registrant as specified in its charter)**

---

| | | |
|:---|:---|:---|
| **Delaware** | **001-32587** | **20-2726770** |
| **(State or other jurisdiction**<br>**of incorporation)** | **(Commission**<br>**File Number)** | **(IRS Employer**<br>**Identification No.)** |
| **910 Clopper Road, Suite 201S**<br>**Gaithersburg, Maryland** |  | **20878** |
| **(Address of principal executive offices)** |  | **(Zip Code)** |

---

**Registrant's telephone number including area code: (240) 654-1450**

**(Former name or former address, if changed since last report)**

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

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

---

| | | |
|:---|:---|:---|
| Title of each class | Trading Symbol(s) | Name of each exchange on which registered |
| Common stock, par value $0.0001 per share | ALT | The NASDAQ Global Market |

---

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

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. ☐

------

**Item 2.02 Results of Operations and Financial Condition**

On May 13, 2026, Altimmune, Inc. (the "Company") issued a press release announcing the Company's financial results for its first quarter ended March 31, 2026. A copy of this press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K.

The information included in this Current Report on Form 8-K (including Exhibit 99.1 hereto) that is furnished pursuant to this Item 2.02 shall not be deemed to be "filed" for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that Section or Sections 11 and 12(a)(2) of the Securities Act of 1933, as amended. In addition, the information included in this Current Report on Form 8-K (including Exhibit 99.1 hereto) that is furnished pursuant to this Item 2.02 shall not be incorporated by reference into any filing of the Registrant, whether made before or after the date hereof, regardless of any general incorporation language in such filing, unless expressly incorporated by specific reference into such filing.

**Item 9.01 Financial Statements and Exhibits**

(d) Exhibits

---

| | |
|:---|:---|
| **No.** | **Description** |
| 99.1 | [Press Release of Altimmune, Inc. dated May 13, 2026](alt-20260513xex99d1.htm) |
| 104 | Cover Page Interactive Data File (embedded within the Inline XBRL document) |

---

**SIGNATURE**

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 hereunto duly authorized.

---

| | |
|:---|:---|
| **ALTIMMUNE, INC.** | **ALTIMMUNE, INC.** |
| By: | /s/ Gregory Weaver |
|  | Name: Gregory Weaver |
|  | Title: Chief Financial Officer |

---

Dated: May 13, 2026

## Exhibit 99.1

![Graphic](alt-20260513xex99d1002.jpg)

#### Exhibit 99.1
**Altimmune Announces First Quarter 2026 Financial Results and Business Update**

*Initiation of PERFORMA Phase 3 MASH trial planned for second half 2026*

*$535 million in cash, cash equivalents and short-term investments as of April 30, 2026*

*Webcast to be held today at 8:30 a.m. ET*

**GAITHERSBURG, MD – May 13, 2026** – Altimmune, Inc. (Nasdaq: ALT), a late clinical-stage biopharmaceutical company developing pemvidutide to address serious liver diseases, today announced financial results for the first quarter ended March 31, 2026, and provided a corporate update.

"We continue to make significant progress across multiple fronts, as we enter a new phase for Altimmune," said Jerry Durso, President and Chief Executive Officer of Altimmune. "As a result of the recent successful financing with top-tier biotech investors, we now have a strong cash position that enables us to focus on execution and delivering on our goal of bringing pemvidutide to patients with serious liver diseases and create long-term value for our shareholders. Looking ahead, we have several important milestones this year, including the initiation of the PERFORMA Phase 3 MASH trial, topline data from the RECLAIM Phase 2 AUD trial, and enrollment completion in the RESTORE Phase 2 ALD trial."

**Highlights and Anticipated Milestones**

**Metabolic Dysfunction-Associated Steatohepatitis (MASH)**

&nbsp;&nbsp;&nbsp;&nbsp;● Pemvidutide was granted Breakthrough Therapy Designation by the FDA based on 24-week data from the IMPACT Phase 2b trial

&nbsp;&nbsp;&nbsp;&nbsp;● The Company expects to initiate its global PERFORMA Phase 3 MASH trial in the second half of 2026, with 52-week data readout anticipated in 2029

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o The PERFORMA trial is a Phase 3, Multinational, Randomized, Double-blind, Placebo-controlled, Parallel-group Study to Evaluate the Efficacy, Safety, and Clinical Outcomes of Pemvidutide in Subjects with MASH

&nbsp;&nbsp;&nbsp;&nbsp;● The study protocol has been finalized and submitted to the FDA

&nbsp;&nbsp;&nbsp;&nbsp;● The PERFORMA Phase 3 registrational trial design is aligned with feedback from the FDA and EMA

&nbsp;&nbsp;&nbsp;&nbsp;● Scientific data to be presented at European Association for the Study of the Liver (EASL) Congress 2026

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o A late-breaking oral presentation on the 48-week IMPACT data in MASH will be delivered by Dr. Mazen Noureddin, Professor of Medicine, Houston Methodist Hospital; Chief Scientific Officer and Co-Chairman, Summit Clinical Research, on May 28, 2026 at 5 p.m. CEST. Abstract selected as "Best of EASL 2026".

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o A late-breaking poster abstract: Pemvidutide Treatment Led to Fibrosis Regression After 24 Weeks in Patients with MASH: Quantitative Digital Pathology Analysis from the Phase 2b IMPACT Trial

------

![Graphic](alt-20260513xex99d1002.jpg)

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o A poster abstract: Concurrent Responses in Multiple Non-Invasive Tests for Hepatic Inflammation and Fibrosis Following Pemvidutide Treatment: 24-Week Responder Analyses from the Phase 2b IMPACT Trial in MASH

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o A poster abstract: Effect of Pemvidutide on Cardiovascular Risk Factors in Patients with MASH: 48-Week Results from the Phase 2b IMPACT Trial

**Alcohol Use Disorder (AUD)**

&nbsp;&nbsp;&nbsp;&nbsp;● Topline data from the RECLAIM Phase 2 trial of pemvidutide in AUD expected in third quarter 2026

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o The RECLAIM trial is evaluating the safety and efficacy of pemvidutide versus placebo in approximately 100 patients with AUD over a 24-week treatment period

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Enrollment was completed in November 2025, several months ahead of schedule, signaling significant interest from patients and providers in potential new AUD therapies

**Alcohol-associated Liver Disease (ALD)**

&nbsp;&nbsp;&nbsp;&nbsp;● *RESTORE Phase 2 trial of pemvidutide in ALD continuing to enroll* 

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o The RESTORE trial is a 48-week study evaluating the safety and efficacy of pemvidutide versus placebo in approximately 100 patients with ALD

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Expect enrollment completion in third quarter 2026

**Corporate Update**

&nbsp;&nbsp;&nbsp;&nbsp;● Strengthened balance sheet

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o In January 2026, the Company completed a registered direct offering of common stock and pre-funded warrants with Alyeska Investment Group, resulting in gross proceeds of $75.0 million

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o In the first quarter of 2026, the Company raised $8.9 million via the At-the-Market (ATM) facility

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o In April 2026, the Company completed an oversubscribed public offering of common stock, pre-funded warrants, and stock warrants, resulting in gross proceeds of $225.0 million

------

![Graphic](alt-20260513xex99d1002.jpg)

**Financial Results for the Three Months Ended March 31, 2026**

&nbsp;&nbsp;&nbsp;&nbsp;● Altimmune reported cash, cash equivalents and short-term investments totaling $332 million as of March 31, 2026

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o As of April 30, 2026, the Company had approximately $535 million of cash, cash equivalents and short-term investments reflecting the net proceeds from the $225 million oversubscribed public offering of common stock, pre-funded warrants, and stock warrants in April 2026

&nbsp;&nbsp;&nbsp;&nbsp;● Research and development (R&D) expenses were $16.2 million for the three months ended March 31, 2026, compared to $15.8 million in the same period in 2025, with the increase driven primarily by the ongoing AUD and ALD trials as well as the startup costs for the PERFORMA Phase 3 trial in MASH, partially offset by the decrease in expenses related to completion of the IMPACT Phase 2b trial in MASH, which was ongoing in 2025. R&D expenses for the quarter ended March 31, 2026, included $9.5 million in direct costs related to pemvidutide development activities

&nbsp;&nbsp;&nbsp;&nbsp;● General and administrative (G&A) expenses were $8.1 million for the three months ended March 31, 2026, compared to $6.0 million in the same period in 2025. The increase was driven primarily by an increase in severance costs and professional fees in the first quarter of 2026

&nbsp;&nbsp;&nbsp;&nbsp;● Interest income was $2.9 million for the three months ended March 31, 2026

&nbsp;&nbsp;&nbsp;&nbsp;● Net loss for the three months ended March 31, 2026, was $22.6 million, or $0.18 net loss per share, compared to a net loss of $19.6 million, or $0.26 net loss per share, in the same period in 2025

#### Conference Call Information:

---

| | |
|:---|:---|
| Date: | May 13, 2026 |
| Time: | 8:30 a.m. Eastern Time |
| Webcast: | To listen, the conference call will be webcast live on Altimmune's Investor Relations (IR) website at <u>https://ir.altimmune.com/investors</u>. |
| Dial-in: | To participate or dial-in, register <u>here</u> to receive the dial-in numbers and unique PIN to access the call. |

---

Following the conclusion of the call, the webcast will be available for replay on the IR page of the Company's website at <u>www.altimmune.com</u>. The Company has used, and intends to continue to use, the IR portion of its website as a means of disclosing material non-public information and for complying with disclosure obligations under Regulation FD.

**About Pemvidutide**

Pemvidutide is a novel, investigational peptide with balanced 1:1 glucagon/GLP-1 dual receptor agonist activity, in development for the treatment of metabolic dysfunction-associated steatohepatitis (MASH), alcohol use disorder (AUD) and alcohol-associated liver disease (ALD). The activation of glucagon receptors results in direct effects on the liver, including reductions in liver fat, inflammation and fibrosis, while GLP-1 receptors mediate metabolic effects such as appetite suppression and weight loss.

The FDA granted Fast Track designations to pemvidutide for the treatment of MASH and AUD, as well as Breakthrough Therapy Designation for MASH. In December 2025, the Company announced 48-week data

------

![Graphic](alt-20260513xex99d1002.jpg)

from the IMPACT Phase 2b trial in MASH. The Phase 2 RECLAIM trial in AUD and RESTORE trial in ALD were initiated in May 2025 and July 2025, respectively, and are currently ongoing.

**About Altimmune**

Altimmune is a late clinical-stage biopharmaceutical company developing therapies for patients with serious liver diseases. The Company's lead candidate, pemvidutide, is a unique dual-action therapy targeting both glucagon and GLP-1 receptors in a balanced 1:1 ratio in development for the treatment of metabolic dysfunction-associated steatohepatitis (MASH), alcohol use disorder (AUD) and alcohol-associated liver disease (ALD). For more information, please visit <u>www.altimmune.com</u>.

**Follow @Altimmune, Inc. on LinkedIn<br>Follow @AltimmuneInc on X**

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![Graphic](alt-20260513xex99d1002.jpg)

**Forward-Looking Statements**

Any statements made in this press release related to the development or commercialization of pemvidutide, an investigational product candidate, and other business, regulatory and financial matters including without limitation, clinical trial study design, status, correspondence, results and data, including the ongoing RECLAIM and RESTORE trials and planned PERFORMA Phase 3 trial, the timing of key milestones for the Company's clinical programs, including the anticipated launch of the PERFORMA Phase 3 trial in MASH, future plans or expectations for pemvidutide for the treatment of MASH, AUD and ALD, the potential benefits of Fast Track and Breakthrough Therapy Designations, including potential regulatory timeline and approval benefits, the Company's financial position, and the prospects for receiving regulatory approval or commercializing or selling any product or drug candidates, financial results, and the impact of the changes to our leadership and governance structure, are forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. In addition, when or if used in this press release, the words "may," "could," "should," "anticipate," "believe," "estimate," "expect," "intend," "plan," "predict" and similar expressions and their variants, as they relate to Altimmune, Inc. may identify forward-looking statements. The Company cautions that these forward-looking statements are subject to numerous assumptions, risks, and uncertainties, which change over time. Important factors that may cause actual results to differ materially from the results discussed in the forward-looking statements or historical experience include risks and uncertainties, including risks relating to: delays in regulatory review, manufacturing and supply chain interruptions, access to clinical sites, enrollment, adverse effects on healthcare systems and disruption of the global economy; the reliability of the results of studies relating to human safety and possible adverse effects resulting from the administration of the Company's product candidates; the Company's ability to manufacture clinical trial materials on the timelines anticipated; and the success of future product advancements, including the success of future clinical trials. Further information on the factors and risks that could affect the Company's business, financial conditions and results of operations are contained in the Company's filings with the U.S. Securities and Exchange Commission, including under the heading "Risk Factors" in the Company's most recent annual report on Form 10-K, quarterly report on Form 10-Q and the Company's other filings with the SEC, which are available at <u>www.sec.gov</u>.

#### Investor Contact:

---

| |
|:---|
| Luis Sanay, CFA<br>Vice President, Investor Relations |
| <u>ir@altimmune.com</u> |

---

#### Media Contact:
Real Chemistry <br> <u>altimmune@realchemistry.com</u>

------

![Graphic](alt-20260513xex99d1002.jpg)

#### ALTIMMUNE, INC.

#### CONSOLIDATED BALANCE SHEETS
**(In thousands, except share and per-share amounts)**

---

| | | |
|:---|:---|:---|
|  | **March 31,** <br>**2026** | **December 31,** <br>**2025** |
|  | **(Unaudited)** |  |
| **ASSETS** |  |  |
| Current assets: |  |  |
| &nbsp;&nbsp;Cash and cash equivalents | $97601 | $43760 |
| &nbsp;&nbsp;Restricted cash | 42 | 42 |
| &nbsp;&nbsp;&nbsp;&nbsp;Total cash, cash equivalents and restricted cash | 97643 | 43802 |
| &nbsp;&nbsp;Short-term investments | 233939 | 229696 |
| &nbsp;&nbsp;Accounts and other receivables | 1665 | 1219 |
| &nbsp;&nbsp;Income tax and R&D incentive receivables  |  | 518 |
| &nbsp;&nbsp;Prepaid expenses and other current assets | 1429 | 2957 |
| &nbsp;&nbsp;&nbsp;&nbsp;Total current assets | 334676 | 278192 |
| Property and equipment, net | 208 | 312 |
| Other assets | 746 | 1425 |
| &nbsp;&nbsp;&nbsp;&nbsp;Total assets | $335630 | $279929 |
| **LIABILITIES AND STOCKHOLDERS' EQUITY** |  |  |
| Current liabilities: |  |  |
| &nbsp;&nbsp;Accounts payable | $1530 | $2717 |
| &nbsp;&nbsp;Accrued expenses and other current liabilities | 9793 | 12280 |
| &nbsp;&nbsp;&nbsp;&nbsp;Total current liabilities | 11323 | 14997 |
| Term loan, noncurrent | 34505 | 34287 |
| Other noncurrent liabilities | 5815 | 5753 |
| &nbsp;&nbsp;&nbsp;&nbsp;Total liabilities | 51643 | 55037 |
| &nbsp;&nbsp;Commitments and contingencies |  |  |
| Stockholders' equity: |  |  |
| &nbsp;&nbsp;Common stock, $0.0001 par value; 200,000,000 shares authorized; 130,221,154 and 110,882,735 shares issued and outstanding as of March 31, 2026 and December 31, 2025, respectively | 13 | 11 |
| &nbsp;&nbsp;Additional paid-in capital | 961244 | 879292 |
| &nbsp;&nbsp;Accumulated deficit | (672046) | (649483) |
| &nbsp;&nbsp;Accumulated other comprehensive loss, net | (5224) | (4928) |
| &nbsp;&nbsp;&nbsp;&nbsp;Total stockholders' equity | 283987 | 224892 |
| &nbsp;&nbsp;&nbsp;&nbsp;Total liabilities and stockholders' equity | $335630 | $279929 |

---

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![Graphic](alt-20260513xex99d1002.jpg)

#### ALTIMMUNE, INC.

#### CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS
**(Unaudited)**

**(In thousands, except share and per-share amounts)**

---

| | | |
|:---|:---|:---|
|  | **Three Months Ended**  | **Three Months Ended**  |
|  | **March 31,**  | **March 31,**  |
|  | **2026** | **2025** |
| Revenues | $— | $5 |
| Operating expenses: |  |  |
| &nbsp;&nbsp;Research and development | 16192 | 15827 |
| &nbsp;&nbsp;General and administrative | 8052 | 5993 |
| &nbsp;&nbsp;&nbsp;&nbsp;Total operating expenses | 24244 | 21820 |
| Loss from operations | (24244) | (21815) |
| Other income (expense): |  |  |
| &nbsp;&nbsp;Interest expense | (1068) | (1) |
| &nbsp;&nbsp;Interest income | 2901 | 1545 |
| &nbsp;&nbsp;Other income (expense), net | (152) | 15 |
| &nbsp;&nbsp;&nbsp;&nbsp;Total other income (expense), net | 1681 | 1559 |
| Net loss before income taxes | (22563) | (20256) |
| Income tax expense (benefit) |  | (681) |
| Net loss | (22563) | (19575) |
| Other comprehensive income — unrealized loss on short-term investments | (296) | (30) |
| Comprehensive loss | $(22859) | $(19605) |
| Net loss per share, basic and diluted | $(0.18) | $(0.26) |
| Weighted-average common shares outstanding, basic and diluted | 124461818 | 75547746 |

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