# EDGAR Filing Document

**Accession Number:** 0001426800
**File Stem:** 0001193125-26-115980
**Filing Date:** 2026-3
**Character Count:** 17552
**Document Hash:** c2f066c7aaa0e3f6271bcb82b99412c1
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-115980.hdr.sgml**: 20260319

**ACCESSION NUMBER**: 0001193125-26-115980

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 10

**CONFORMED PERIOD OF REPORT**: 20260319

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

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20260319

**DATE AS OF CHANGE**: 20260319

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** ASSEMBLY BIOSCIENCES, INC.
- **CENTRAL INDEX KEY:** 0001426800
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-35005
- **FILM NUMBER:** 26774336

**BUSINESS ADDRESS:**
- **STREET 1:** TWO TOWER PLACE
- **STREET 2:** 7TH FLOOR
- **CITY:** SOUTH SAN FRANCISCO
- **STATE:** CA
- **ZIP:** 94080
- **BUSINESS PHONE:** (833) 409-4583

**MAIL ADDRESS:**
- **STREET 1:** TWO TOWER PLACE
- **STREET 2:** 7TH FLOOR
- **CITY:** SOUTH SAN FRANCISCO
- **STATE:** CA
- **ZIP:** 94080

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** VENTRUS BIOSCIENCES INC
- **DATE OF NAME CHANGE:** 20080211

?xml version='1.0' encoding='ASCII'? 8-K

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**WASHINGTON, D.C. 20549** 

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**FORM** 8-K

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**CURRENT REPORT**

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

**Date of Report (Date of earliest event reported):** March 19, 2026

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Assembly Biosciences, Inc.

 **(Exact name of Registrant as Specified in Its Charter)**

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| | | |
|:---|:---|:---|
| Delaware | 001-35005 | 20-8729264 |
| **(State or Other Jurisdiction**<br>**of Incorporation)** | **(Commission File Number)** | **(IRS Employer**<br>**Identification No.)** |
| Two Tower Place**,** 7th Floor**,**<br>South San Francisco**,** California |  | 94080 |
| **(Address of Principal Executive Offices)** |  | **(Zip Code)** |

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**Registrant's Telephone Number, Including Area Code:** (833) 509-4583

**Not Applicable**

**(Former Name or Former Address, if Changed Since Last Report)**

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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:

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| | | |
|:---|:---|:---|
| **Title of each class** | **Trading**<br>**Symbol(s)** | **Name of each exchange on which registered** |
| Common Stock, par value $0.001 | ASMB | The Nasdaq Global Select Market |

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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. ☐

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

On March 19, 2026, Assembly Biosciences, Inc. (the "Company") issued a press release announcing its financial results for the quarter and year ended December 31, 2025. A copy of the press release is attached hereto as Exhibit 99.1.

The information furnished with this Item 2.02, including Exhibit 99.1, 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 it be deemed incorporated by reference into any other filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing.

**Item 9.01 Financial Statements and Exhibits.**

(d) <u>Exhibits</u>.

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| | |
|:---|:---|
| **Exhibit**<br>**Number** | **Description** |
| 99.1 | [<u>Press Release issued March 19, 2026</u>](asmb-ex99_1.htm) |
| 104 | Cover Page Interactive Data File (embedded within the Inline XBRL document) |

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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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| | | |
|:---|:---|:---|
|  | Assembly Biosciences, Inc. | Assembly Biosciences, Inc. |
| Date: March 19, 2026 | By: | /s/ John O. Gunderson |
|  |  | John O. Gunderson |
|  |  | VP, General Counsel and Corporate Secretary |

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## Exhibit 99.1

**Exhibit 99.1**

**Assembly Biosciences Reports Year-End 2025 Financial Results and Recent Highlights**

*– Successfully licensed helicase-primase inhibitor program for recurrent genital herpes to Gilead, including candidates ABI-5366 and ABI-1179, following positive Phase 1b interim data; development plan anticipated by mid-2026 –*

*– Phase 2 initiation for ABI-6250, an oral small-molecule entry inhibitor candidate for chronic hepatitis delta virus, anticipated by end of 2026 –*

SOUTH SAN FRANCISCO, Calif. – March 19, 2026 – Assembly Biosciences, Inc. (Nasdaq: ASMB), a biotechnology company developing innovative therapeutics targeting serious viral diseases, today reported financial results for the year ended December 31, 2025, and recent highlights.

"2025 was a pivotal year for the Company, and we anticipate another strong year ahead," said Jason Okazaki, chief executive officer and president of Assembly Bio. "Compelling Phase 1b data across ABI-5366 and ABI-1179 led to an early decision by Gilead to license the HPI program, validating the strength of our science and execution, as well as the potential for our long-acting, oral antivirals to meaningfully improve patient care. As we enter 2026, we are well positioned – both scientifically and financially – to build on this momentum as we continue advancing our broader pipeline."

**Fourth Quarter 2025 and Recent Highlights**

• **Recurrent genital herpes**

oReleased positive interim Phase 1b data from two weekly dose cohorts of ABI-1179 and additional interim data from the ABI-5366 Phase 1b study, including unblinded safety data from two weekly cohorts released in August 2025 and a monthly oral proof-of-concept cohort

oLicensed helicase-primase inhibitor (HPI) program, including ABI-5366 and ABI-1179, to Gilead Sciences, Inc. (Gilead), receiving a net $35 million option fee under the ongoing collaboration agreement

oCompleted dosing and follow-up for all participants in Phase 1a/b studies for ABI-5366 and ABI-1179

• **Viral hepatitis**

oGilead declined to exercise or defer its option on ABI-4334, a highly potent capsid assembly modulator candidate for chronic hepatitis B virus (HBV) infection

oInitiated a structured process to find a partner for ABI-4334 after regaining sole rights to the program

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• **Scientific conference presentations highlighted**

oPresented interim Phase 1b data for ABI-5366 in a late-breaking oral presentation at the 38th Congress of the International Union Against Sexually Transmitted Infections (IUSTI)-Europe in Athens, Greece

oPresented Phase 1b data for ABI-4334 in a poster presentation at the American Association for the Study of Liver Diseases (AASLD), The Liver Meeting®, in Washington, D.C.

**Anticipated Milestones and Events**

• By mid-2026, pending receipt of Gilead's development plan and budget, determine whether to opt in to 40% U.S. cost-profit share for herpesvirus HPI program (ABI-5366 and ABI-1179), in lieu of receiving U.S. milestones and royalties

• Initiate a Phase 2 clinical study for ABI-6250 in participants with chronic hepatitis delta virus (HDV) by the end of 2026

**Upcoming Conferences**

• **ABI-5366 and ABI-1179:** Multiple abstracts accepted for presentation at the Congress of the European Society of Clinical Microbiology and Infectious Diseases (ESCMID) taking place in Munich, Germany from April 17-21, 2026

• **ABI-6250:** Phase 1a data for ABI-6250 accepted as a poster presentation at the European Association for the Study of the Liver (EASL) Congress taking place in Barcelona, Spain from May 27-30, 2026

ABI-5366, ABI-1179, ABI-6250 and ABI-4334 are investigational product candidates that have not been approved anywhere globally, and their safety and efficacy have not been established.

**Year-End 2025 Financial Results**

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•**Cash, cash equivalents and marketable securities** were $248.1 million as of December 31, 2025, compared to $232.6 million as of September 30, 2025, and $112.1 million as of the year ended December 31, 2024. The company's cash position is projected to fund operations into 2028.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•**Revenue** from collaborative research with Gilead was $72.3 million for the year ended December 31, 2025, compared to $28.5 million in 2024. The increase reflects the increase in collaboration funding.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•**Research and development expenses** were $64.8 million for the year ended December 31, 2025, compared to $55.9 million in 2024. The increase is largely driven by an increase in spending on the HPI program, as both ABI-1179 and ABI-5366 saw significant enrollment in their respective Phase 1b clinical studies during the current year.

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•**General and administrative expenses** were $19.6 million for the year ended December 31, 2025, compared to $18.0 million in 2024. The increase was primarily due to higher professional fees and increased stock-based compensation related to performance-based awards.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•**Net loss attributable to common stockholders** was $6.1 million, or $0.55 per basic and diluted share, for the year ended December 31, 2025, compared to $40.2 million, or $6.69 per basic and diluted share, in 2024.

**About Assembly Biosciences** 

Assembly Biosciences is a biotechnology company dedicated to the development of innovative small-molecule therapeutics designed to change the path of serious viral diseases and improve the lives of patients worldwide. Led by an accomplished team of leaders in virologic drug development, Assembly Bio is committed to improving outcomes for patients struggling with the serious, chronic impacts of herpesvirus, hepatitis B virus (HBV) and hepatitis delta virus (HDV) infections. For more information, visit assemblybio.com.

**Forward-Looking Statements**

The information in this press release contains forward-looking statements that are subject to certain risks and uncertainties that could cause actual results to materially differ. These risks and uncertainties include: Assembly Bio's ability to realize the potential benefits of its collaboration with Gilead, including all financial aspects of the collaboration and equity investments; Assembly Bio's ability to initiate and complete clinical studies involving its therapeutic product candidates, including studies contemplated by Assembly Bio's collaboration with Gilead, in the currently anticipated timeframes or at all; safety and efficacy data from clinical or nonclinical studies may not warrant further development of Assembly Bio's product candidates; clinical and nonclinical data may not differentiate Assembly Bio's product candidates from other companies' candidates; Assembly Bio's ability to maintain financial resources and secure additional funding necessary to continue its research activities, clinical studies, and other business operations; potential effects of changes in government regulation; results of nonclinical studies may not be representative of disease behavior in a clinical setting and may not be predictive of the outcomes of clinical studies; and other risks identified from time to time in Assembly Bio's reports filed with the U.S. Securities and Exchange Commission (the SEC). You are urged to consider statements that include the words may, will, would, could, should, might, believes, hopes, estimates, projects, potential, expects, plans, anticipates, intends, continues, forecast, designed, goal or the negative of those words or other comparable words to be uncertain and forward-looking. Assembly Bio intends such forward-looking statements to be covered by the safe harbor provisions contained in Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. More information about Assembly Bio's risks and uncertainties are more fully detailed under the heading "Risk Factors" in Assembly Bio's filings with the SEC, including its most recent Annual Report on Form 10-K, Quarterly Reports on Form 10-Q and Current Reports on Form 8-K. Except as required by law, Assembly Bio assumes no obligation to update publicly

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any forward-looking statements, whether as a result of new information, future events or otherwise.

**Contacts:**

**Investors:**

Patrick Till

Meru Advisors

(484) 788-8560

<u>investor_relations@assemblybio.com</u>

**Media:**<br>Sam Brown LLC<br>Alyssa Kuciunas

(331) 481-3751

ASMBMedia@sambrown.com

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**ASSEMBLY BIOSCIENCES, INC.**

**CONSOLIDATED BALANCE SHEETS**

(In thousands except for share amounts and par value)

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| | | |
|:---|:---|:---|
|  | **As of December 31,** | **As of December 31,** |
|  | **2025** | **2024** |
| **ASSETS** |  |  |
| Current assets |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Cash and cash equivalents | $58450 | $38344 |
| &nbsp;&nbsp;&nbsp;&nbsp;Marketable securities | 189656 | 73735 |
| &nbsp;&nbsp;&nbsp;&nbsp;Accounts receivable from collaboration with a related party | 974 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Prepaid expenses and other current assets | 5469 | 3424 |
| Total current assets | 254549 | 115503 |
| &nbsp;&nbsp;&nbsp;&nbsp;Property and equipment, net | 221 | 284 |
| &nbsp;&nbsp;&nbsp;&nbsp;Operating lease right-of-use assets | 2508 | 3069 |
| &nbsp;&nbsp;&nbsp;&nbsp;Other assets | 312 | 312 |
| **Total assets** | $**257590** | $**119168** |
| **LIABILITIES AND STOCKHOLDERS' EQUITY** |  |  |
| Current liabilities |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Accounts payable | $1171 | $585 |
| &nbsp;&nbsp;&nbsp;&nbsp;Accrued research and development expenses | 2387 | 2273 |
| &nbsp;&nbsp;&nbsp;&nbsp;Other accrued expenses | 7749 | 6862 |
| &nbsp;&nbsp;&nbsp;&nbsp;Deferred revenue from a related party - short-term | 36904 | 37622 |
| &nbsp;&nbsp;&nbsp;&nbsp;Operating lease liabilities - short-term | 569 | 461 |
| Total current liabilities | 48780 | 47803 |
| &nbsp;&nbsp;&nbsp;&nbsp;Deferred revenue from a related party - long-term |  | 35378 |
| &nbsp;&nbsp;&nbsp;&nbsp;Operating lease liabilities - long-term | 2059 | 2628 |
| **Total liabilities** | **50839** | **85809** |
| **Commitments and contingencies** |  |  |
| **Stockholders' equity** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Preferred stock, $0.001 par value; 5,000,000 shares authorized; no shares issued or outstanding |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Common stock, $0.001 par value; 150,000,000 shares authorized as of December 31, 2025 and December 31, 2024; 15,855,329 and 7,457,240 shares issued and outstanding as of December 31, 2025 and December 31, 2024, respectively | 16 | 7 |
| &nbsp;&nbsp;&nbsp;&nbsp;Additional paid-in capital | 1038823 | 859488 |
| &nbsp;&nbsp;&nbsp;&nbsp;Accumulated other comprehensive loss | (41) | (211) |
| &nbsp;&nbsp;&nbsp;&nbsp;Accumulated deficit | (832047) | (825925) |
| &nbsp;&nbsp;&nbsp;&nbsp;Total stockholders' equity | 206751 | 33359 |
| **Total liabilities and stockholders' equity** | $**257590** | $**119168** |

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**ASSEMBLY BIOSCIENCES, INC.**

**CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS**

(In thousands except for share and per share amounts)

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| | | |
|:---|:---|:---|
|  | **Year Ended December 31,** | **Year Ended December 31,** |
|  | **2025** | **2024** |
| **Collaboration revenue from a related party** | $72303 | $28520 |
| **Operating expenses** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Research and development | 64813 | 55933 |
| &nbsp;&nbsp;&nbsp;&nbsp;General and administrative | 19608 | 18007 |
| Total operating expenses | 84421 | 73940 |
| **Loss from operations** | **(12118)** | **(45420)** |
| **Other income** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Interest and other income, net | 5996 | 5573 |
| Total other income | 5996 | 5573 |
| **Loss before income taxes** | **(6122)** | **(39847)** |
| Income tax expense |  | 330 |
| **Net loss** | $**(6122)** | $**(40177)** |
| **Other comprehensive loss** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Unrealized gain (loss) on marketable securities | 170 | (130) |
| **Comprehensive loss** | $**(5952)** | $**(40307)** |
| Net loss per share, basic and diluted | $(0.55) | $(6.69) |
| Weighted average common shares outstanding, basic and diluted | 11210934 | 6004560 |

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