ボルトバイオセラピューティクスの適時開示・その他

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 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): October 1, 2025

    

BOLT BIOTHERAPEUTICS, INC.

(Exact name of Registrant as Specified in Its Charter)


Delaware	001-39988	47-2804636
(State or Other Jurisdiction of Incorporation)	(Commission File Number)	(IRS Employer Identification No.)

900 Chesapeake Drive
Redwood City, California		94063
(Address of Principal Executive Offices)		(Zip Code)

     Registrant’s Telephone Number, Including Area Code: (650) 665-9295

    

     Not Applicable

    

(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 $0.00001 per share	BOLT	The Nasdaq Capital 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. ☒ On October 1, 2025, Bolt Biotherapeutics, Inc., a Delaware corporation (the “Company”), implemented a restructuring plan pursuant to which it will reduce overall operating expenses to preserve cash.

Item 2.05 Costs Associated with Exit or Disposal Activities.

The restructuring plan includes a reduction of the Company’s current workforce by approximately 20 employees, or approximately 50% of the Company’s workforce. The Company estimates that it will incur aggregate pre-tax charges between approximately $1.5 million to $2.0 million in connection with the reduction-in-force, primarily consisting of severance payments, employee benefits, and related costs. The Company expects that the reduction-in-force will be complete by the end of 2025 and that the associated charges will be recorded in the fourth quarter of 2025. The estimated charges that the Company expects to incur are subject to a number of assumptions, and actual results may differ materially from these estimates. The Company may also incur additional costs not currently contemplated due to events that may occur as a result of, or that are associated with, the restructuring plan.

Item 8.01 Other Events

On October 1, 2025, the Company announced an update on the ongoing Phase 1 dose escalation study of BDC-4182, a next-generation Boltbody™ ISAC clinical candidate targeting claudin 18.2, a clinically validated target in oncology. A strong immune response was observed at the initial dose levels and the Company is in the process of modifying the clinical trial protocol to allow for step-up dosing, which has been successfully used commercially for T-cell engagers. BDC-4182 preclinical data supports this approach. As a result of the update to the clinical trial protocol for BDC-4182, the Company now expects to report initial clinical data in the third quarter of 2026. To conserve capital and maintain long-term shareholder value, the Company is implementing a workforce reduction as described in Item 2.05, extending its cash runway into 2027. A press release announcing the reduction-in-force described in Item 2.05 and the update on the ongoing Phase 1 dose escalation study of BDC-4182 is filed hereto as Exhibit 99.1.




Exhibit No.		Description
99.1		Press Release dated October 1, 2025.
104		Cover Page Interactive Data File (embedded within the Inline XBRL document).

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.


			Bolt Biotherapeutics, Inc.

Date:	October 2, 2025	By:	/s/ William P. Quinn
			William P. Quinn President, Chief Executive Officer and Chief Financial Officer

EX-99.1 2 bolt-ex99_1.htm EX-99.1 EX-99.1

Bolt Biotherapeutics Provides Update on BDC-4182 and Extends Cash Runway into 2027

•

Initial clinical data for BDC-4182 Phase 1 dose escalation study now expected in 3Q 2026

•

Company is implementing a 50% workforce reduction to extend cash runway into 2027

REDWOOD CITY, CA, October 1, 2025 – Bolt Biotherapeutics (Nasdaq: BOLT), a clinical-stage biopharmaceutical company developing novel immunotherapies for the treatment of cancer, today announced an update on the ongoing Phase 1 dose escalation study of BDC-4182, a next-generation Boltbody™ ISAC clinical candidate targeting claudin 18.2, a clinically validated target in oncology. A strong immune response was observed at the initial dose levels and the Company is in the process of modifying the clinical trial protocol to allow for step-up dosing, which has been successfully used commercially for T-cell engagers. BDC-4182 preclinical data supports this approach.

As a result of the update to the clinical trial protocol for BDC-4182, Bolt now expects to report initial clinical data in the third quarter of 2026. To conserve capital and maintain long-term shareholder value, the Company is implementing a workforce reduction of approximately 50%, extending its cash runway into 2027.

“I want to sincerely thank all of our colleagues impacted by this decision. Their commitment and valuable contributions have been essential in developing our novel BoltbodyTM ISAC technology and these potential new treatment options for patients with cancer,” said Willie Quinn, President and Chief Executive Officer. “Amid challenging market conditions, our strategic imperative is the clinical advancement of BDC-4182 and the support of our ISAC collaborations to increase shareholder value. We look forward continuing our mission and to providing updates on BDC-4182 later next year.”

About Bolt Biotherapeutics, Inc.

Bolt Biotherapeutics is a clinical-stage biopharmaceutical company developing novel immunotherapies for the treatment of cancer. Bolt Biotherapeutics’ pipeline candidates are built on the Company’s deep expertise in myeloid biology and cancer drug development. The Company’s pipeline includes BDC-4182, a next-generation Boltbody™ Immune-Stimulating Antibody Conjugate (ISAC) clinical candidate targeting claudin 18.2. BDC-4182 is currently in a Phase 1 dose escalation trial that includes patients with gastric and gastroesophageal cancer. The Company has strategic collaborations with Genmab and Toray built around the Company’s Boltbody™ Immune-Stimulating Antibody Conjugate (ISAC) platform technology and its expertise in myeloid biology. The Company is seeking to partner its Dectin-2 agonist, BDC-3042, that recently completed a first-in-human Phase 1 dose escalation trial. For more information, please visit https://www.boltbio.com/.

Forward-Looking Statements

This press release contains forward-looking statements about us and our industry that involve substantial risks and uncertainties and are based on our beliefs and assumptions and on information currently available to us. All statements other than statements of historical facts contained in this press release, including statements regarding our ability to partner BDC-3042, the advancement and success of our BDC-4182 clinical trials, the receipt of BDC-4182 initial clinical data in the third quarter of 2026, the anti-tumor potency, safety and tolerability, and characteristics of our product candidates, the initiation of future clinical trials, the potential value of collaborations, and the expected duration of our cash runway into 2027, are forward-looking statements.

In some cases, you can identify forward-looking statements because they contain words such as “anticipate,” “believe,” “could,” “estimate,” “expect,” “intend,” “may,” “on track,” “plan,” “potential,” “predict,” “project,” “should,” “will,” or “would,” or the negative of these words or other similar terms or expressions. Forward-looking statements involve known and unknown risks, uncertainties and other factors that may cause our actual results, performance, or achievements to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements. Forward-looking statements represent our current beliefs, estimates and assumptions only as of the date of this press release and information contained in this press release should not be relied upon as representing our estimates as of any subsequent date. These statements, and related risks, uncertainties, factors and assumptions, include, but are not limited to: the potential product candidates that we develop may not progress through clinical development or receive required regulatory approvals within expected timelines or at all; clinical trials may not confirm any safety, potency or other product characteristics described or assumed in this press release; such product candidates may not be beneficial to patients or become commercialized; and our ability to maintain our current collaborations and establish further collaborations. These risks are not exhaustive. Except as required by law, we assume no obligation to update these forward-looking statements, or to update the reasons actual results could differ materially from those anticipated in the forward-looking statements, even if new information becomes available in the future. Further information on factors that could cause actual results to differ materially from the results anticipated by our forward-looking statements is included in the reports we have filed or will file with the Securities and Exchange Commission, including our Annual Report on Form 10-K and Quarterly Reports on Form 10-Q. These filings, when available, are available on the investor relations section of our website at investors.boltbio.com and on the SEC’s website at www.sec.gov.

Investor Relations and Media Contact:

Matthew DeYoung

Argot Partners

(212) 600-1902

boltbio@argotpartners.com