Form 8-K

8-K — Armata Pharmaceuticals, Inc.

Accession: 0001104659-26-076627

Filed: 2026-06-23

Period: 2026-06-23

CIK: 0000921114

SIC: 2836 (BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES))

Item: Other Events

Item: Financial Statements and Exhibits

Documents

8-K — tm2618503d1_8k.htm (Primary)

EX-99.1 — EXHIBIT 99.1 (tm2618503d1_ex99-1.htm)

GRAPHIC (tm2618503d1_ex99-1img001.jpg)

XML — IDEA: XBRL DOCUMENT (R1.htm)

8-K — FORM 8-K

8-K (Primary)

Filename: tm2618503d1_8k.htm · Sequence: 1

false

0000921114

2026-06-23

iso4217:USD

xbrli:shares

iso4217:USD

xbrli:shares

UNITED STATES

SECURITIES 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):

June 23, 2026

ARMATA PHARMACEUTICALS, INC.

(Exact name of Registrant as specified in

its charter)

Washington

001-37544

91-1549568

(State or other jurisdiction

of incorporation or

organization)

(Commission File Number)

(IRS Employer Identification No.)

5005 McConnell Avenue

Los Angeles, California

90066

(Address of principal executive offices)

(Zip Code)

(310) 665-2928

(Registrant’s Telephone number)

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 (see General Instruction A.2. below):

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))

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. ¨

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

ARMP

NYSE American

Item 8.01

Other Events.

On June 23, 2026, the Company issued a press release announcing that

it had received $2.5 million of additional non-dilutive award funding from the U.S. Department of Defense for the development of AP-SA02,

the Company's intravenously administered Staphylococcus aureus phage product candidate, to treat complicated bacteremia infections.

The full text of the press release issued in connection with this announcement is attached as Exhibit 99.1 to this Current Report on Form

8-K and incorporated herein by reference.

Item 9.01

Financial Statements and Exhibits.

(d)

Exhibits.

Exhibit

No.

Description

99.1

Press Release, dated June 23, 2026.

104

Cover Page Interactive Data File (embedded within the Inline XBRL document

- 2 -

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 hereunto duly authorized.

Date: June 23, 2026

Armata Pharmaceuticals, Inc.

By:

/s/ David House

Name:

David House

Title:

Senior Vice President, Finance and Principal Financial Officer

- 3 -

EX-99.1 — EXHIBIT 99.1

EX-99.1

Filename: tm2618503d1_ex99-1.htm · Sequence: 2

Exhibit 99.1

Armata Pharmaceuticals Receives $2.5 Million

of Additional Non-Dilutive Award Funding from the

U.S. Department of Defense to Support AP-SA02

Supports Phase 3 readiness of AP-SA02

Non-dilutive DoD funding totals $28.7M to date

LOS ANGELES, Calif., June 23, 2026 -- Armata

Pharmaceuticals, Inc. (NYSE American: ARMP) (“Armata” or the “Company”), a late clinical-stage biotechnology

company focused on the development of high-purity, pathogen-specific bacteriophage therapeutics for the treatment of antibiotic-resistant

and difficult-to-treat bacterial infections, today announced that it has received an additional $2.5 million of non-dilutive funding pursuant

to a previously announced Department of Defense (DoD) award, received through the Medical Technology Enterprise Consortium (MTEC) and

managed by the Naval Medical Research Command (NMRC) – Naval Advanced Medical Development (NAMD) with funding from the Defense Health

Agency and Joint Warfighter Medical Research Program. The award, which now totals $28.7 million, supports the development of Armata’s

lead clinical candidate AP-SA02, for adjunct treatment of complicated Staphylococcus aureus (“S. aureus”) bacteremia

(“SAB”) caused by methicillin-sensitive S. aureus (“MSSA”) or methicillin resistant S. aureus (“MRSA”).

The additional $2.5 million is intended to fund key activities to support Phase 3 readiness of AP-SA02.

“The DoD has been a strong and valued partner

in the development of AP-SA02, and we appreciate its continued support for this important program,” said Dr. Deborah Birx,

Chief Executive Officer of Armata. “With phage therapy gaining attention globally as a potential tool to combat the growing antimicrobial

resistance crisis, DoD support at the federal level is important to ensuring the U.S. contributes to this critical field. We remain focused

on moving AP-SA02 efficiently through clinical development with the goal of delivering this novel phage-based therapy to patients in need,

including both military and civilian populations.”

“Armata is advancing plans to initiate a

Phase 3 superiority study of intravenous AP-SA02 in complicated SAB in the second half of 2026. Principal Investigators at sites around

the U.S. continue to express excitement about participating in the Phase 3 study. We believe AP-SA02 has the potential to bring new hope

to all patients affected by this common, highly severe, and often deadly infection,” concluded Dr. Birx.

About AP-SA02

Armata is developing AP-SA02, a fixed multi-phage

cocktail, for the adjunct treatment of complicated SAB caused by MSSA or MRSA. AP-SA02 has received Qualified Infectious Disease Product

(QIDP) and Fast Track designations from the U.S. Food and Drug Administration. Armata’s diSArm study (NCT05184764) was a

Phase 1b/2a, multicenter, randomized, double-blind, placebo-controlled, multiple ascending dose escalation study of the safety, tolerability,

and efficacy of intravenous AP-SA02 in addition to best available antibiotic therapy (“BAT”) compared to BAT alone (placebo)

for the treatment of adults with complicated SAB. Positive results from the Phase 2a diSArm study were highlighted in a late-breaking

oral presentation at IDWeek 2025™ in October 2025.

About Armata Pharmaceuticals, Inc.

Armata is a late clinical-stage biotechnology

company focused on the development of high-purity pathogen-specific bacteriophage therapeutics for the treatment of antibiotic-resistant

and difficult-to-treat bacterial infections using its proprietary bacteriophage-based technology. Armata is developing and advancing a

broad pipeline of natural and synthetic phage candidates, including clinical candidates for Pseudomonas aeruginosa, S. aureus,

and other important pathogens. Armata is committed to advancing phage therapy with drug development expertise that spans bench to clinic,

including in-house phage-specific current Good Manufacturing Practices (“cGMP”) manufacturing to support full commercialization.

- 1 -

Forward Looking Statements

This communication contains “forward-looking”

statements as defined by the Private Securities Litigation Reform Act of 1995. These statements relate to future events, results or to

Armata’s future financial performance and involve known and unknown risks, uncertainties and other factors which may cause Armata’s

actual results, performance or events to be materially different from any future results, performance or events expressed or implied by

the forward-looking statements. In some cases, you can identify these statements by terms such as “anticipate,” “believe,”

“could,” “estimate,” “expect,” “intend,” “may,” “plan,” “potential,”

“predict,” “project,” “should,” “will,” “would” or the negative of those terms,

and similar expressions. These forward-looking statements reflect management’s beliefs and views with respect to future events and

are based on estimates and assumptions as of the date of this communication and are subject to risks and uncertainties including risks

related to Armata’s development of bacteriophage-based therapies; Armata's planned clinical trials; ability to staff and maintain

its production facilities under fully compliant cGMP; ability to meet anticipated milestones in the development and testing of the relevant

product; ability to be a leader in the development of phage-based therapeutics; ability to achieve its vision, including improvements

through engineering and success of clinical trials; ability to successfully complete preclinical and clinical development of, and obtain

regulatory approval of its product candidates and commercialize any approved products on its expected timeframes or at all; and Armata’s

estimates regarding anticipated operating losses, capital requirements and needs for additional funds. Additional risks and uncertainties

relating to Armata and its business can be found under the caption “Risk Factors” and elsewhere in Armata’s filings

and reports with the U.S. Securities and Exchange Commission (the “SEC”), including in Armata’s Annual Report on Form 10-K,

filed with the SEC on March 25, 2026, and in its subsequent filings with the SEC.

Armata expressly disclaims any obligation or undertaking

to release publicly any updates or revisions to any forward-looking statements contained herein to reflect any change in Armata’s

expectations with regard thereto or any change in events, conditions or circumstances on which any such statements are based.

Media Contacts:

At Armata:

Pierre Kyme

ir@armatapharma.com

310-665-2928

Investor Relations:

Joyce Allaire

LifeSci Advisors, LLC

jallaire@lifesciadvisors.com

212-915-2569

- 2 -

GRAPHIC

Filename: tm2618503d1_ex99-1img001.jpg · Sequence: 6

Binary file (5202 bytes)

Download tm2618503d1_ex99-1img001.jpg

XML — IDEA: XBRL DOCUMENT

XML

Filename: R1.htm · Sequence: 8

v3.26.1

Cover

Jun. 23, 2026

Cover [Abstract]

Document Type

8-K

Amendment Flag

false

Document Period End Date

Jun. 23, 2026

Entity File Number

001-37544

Entity Registrant Name

ARMATA PHARMACEUTICALS, INC.

Entity Central Index Key

0000921114

Entity Tax Identification Number

91-1549568

Entity Incorporation, State or Country Code

Entity Address, Address Line One

5005 McConnell Avenue

Entity Address, City or Town

Los Angeles

Entity Address, State or Province

Entity Address, Postal Zip Code

90066

City Area Code

310

Local Phone Number

665-2928

Written Communications

false

Soliciting Material

false

Pre-commencement Tender Offer

false

Pre-commencement Issuer Tender Offer

false

Title of 12(b) Security

Common Stock

Trading Symbol

ARMP

Security Exchange Name

NYSEAMER

Entity Emerging Growth Company

false

- Definition

Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.

+ References

No definition available.

+ Details

Name:

dei_AmendmentFlag

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Area code of city

+ References

No definition available.

+ Details

Name:

dei_CityAreaCode

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Cover page.

+ References

No definition available.

+ Details

Name:

dei_CoverAbstract

Namespace Prefix:

dei_

Data Type:

xbrli:stringItemType

Balance Type:

Period Type:

duration

- Definition

For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD.

+ References

No definition available.

+ Details

Name:

dei_DocumentPeriodEndDate

Namespace Prefix:

dei_

Data Type:

xbrli:dateItemType

Balance Type:

Period Type:

duration

- Definition

The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.

+ References

No definition available.

+ Details

Name:

dei_DocumentType

Namespace Prefix:

dei_

Data Type:

dei:submissionTypeItemType

Balance Type:

Period Type:

duration

- Definition

Address Line 1 such as Attn, Building Name, Street Name

+ References

No definition available.

+ Details

Name:

dei_EntityAddressAddressLine1

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Name of the City or Town

+ References

No definition available.

+ Details

Name:

dei_EntityAddressCityOrTown

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Code for the postal or zip code

+ References

No definition available.

+ Details

Name:

dei_EntityAddressPostalZipCode

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Name of the state or province.

+ References

No definition available.

+ Details

Name:

dei_EntityAddressStateOrProvince

Namespace Prefix:

dei_

Data Type:

dei:stateOrProvinceItemType

Balance Type:

Period Type:

duration

- Definition

A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityCentralIndexKey

Namespace Prefix:

dei_

Data Type:

dei:centralIndexKeyItemType

Balance Type:

Period Type:

duration

- Definition

Indicate if registrant meets the emerging growth company criteria.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityEmergingGrowthCompany

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.

+ References

No definition available.

+ Details

Name:

dei_EntityFileNumber

Namespace Prefix:

dei_

Data Type:

dei:fileNumberItemType

Balance Type:

Period Type:

duration

- Definition

Two-character EDGAR code representing the state or country of incorporation.

+ References

No definition available.

+ Details

Name:

dei_EntityIncorporationStateCountryCode

Namespace Prefix:

dei_

Data Type:

dei:edgarStateCountryItemType

Balance Type:

Period Type:

duration

- Definition

The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityRegistrantName

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityTaxIdentificationNumber

Namespace Prefix:

dei_

Data Type:

dei:employerIdItemType

Balance Type:

Period Type:

duration

- Definition

Local phone number for entity.

+ References

No definition available.

+ Details

Name:

dei_LocalPhoneNumber

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 13e

-Subsection 4c

+ Details

Name:

dei_PreCommencementIssuerTenderOffer

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 14d

-Subsection 2b

+ Details

Name:

dei_PreCommencementTenderOffer

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Title of a 12(b) registered security.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b

+ Details

Name:

dei_Security12bTitle

Namespace Prefix:

dei_

Data Type:

dei:securityTitleItemType

Balance Type:

Period Type:

duration

- Definition

Name of the Exchange on which a security is registered.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection d1-1

+ Details

Name:

dei_SecurityExchangeName

Namespace Prefix:

dei_

Data Type:

dei:edgarExchangeCodeItemType

Balance Type:

Period Type:

duration

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as soliciting material pursuant to Rule 14a-12 under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 14a

-Subsection 12

+ Details

Name:

dei_SolicitingMaterial

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Trading symbol of an instrument as listed on an exchange.

+ References

No definition available.

+ Details

Name:

dei_TradingSymbol

Namespace Prefix:

dei_

Data Type:

dei:tradingSymbolItemType

Balance Type:

Period Type:

duration

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Securities Act

-Number 230

-Section 425

+ Details

Name:

dei_WrittenCommunications

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration