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Form 8-K

sec.gov

8-K — Bolt Biotherapeutics, Inc.

Accession: 0001193125-26-219361

Filed: 2026-05-12

Period: 2026-05-12

CIK: 0001641281

SIC: 2834 (PHARMACEUTICAL PREPARATIONS)

Item: Results of Operations and Financial Condition

Item: Financial Statements and Exhibits

Documents

8-K — bolt-20260512.htm (Primary)

EX-99.1 (bolt-ex99_1.htm)

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8-K

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8-K

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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): May 12, 2026

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 (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))

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. ☒

Item 2.02 Results of Operations and Financial Condition.

On May 12, 2026, Bolt Biotherapeutics, Inc. (the “Company”) issued a press release announcing its financial results for the first quarter ended March 31, 2026 and a business update. A copy of the press release is furnished herewith as Exhibit 99.1 and incorporated herein by reference.

The information contained herein and the accompanying exhibit is furnished and shall not be deemed “filed” for 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, nor shall it be deemed incorporated by reference in any filing with the Securities and Exchange Commission made by us, whether made before or after the date hereof, regardless of any general incorporation language in such filing.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.

Description

99.1

Press Release dated May 12, 2026.

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 thereunto duly authorized.

Bolt Biotherapeutics, Inc.

Date:

May 12, 2026

By:

/s/ William P. Quinn

William P. Quinn

President, Chief Executive Officer and Chief Financial Officer

EX-99.1

EX-99.1

Filename: bolt-ex99_1.htm · Sequence: 2

EX-99.1

Exhibit 99.1

Bolt Biotherapeutics Reports First Quarter 2026 Financial Results and Provides Business Update

First-in-class immune-stimulating antibody conjugate BDC-4182 Phase 1/2 study ongoing, initial clinical data expected in 3Q 2026

Cash balance of $23.9 million as of March 31, 2026 anticipated to fund operations into 2027, including completion of the dose escalation portion of the ongoing BDC-4182 Phase 1/2 study

REDWOOD CITY, CA, May 12, 2026 – Bolt Biotherapeutics (Nasdaq: BOLT), a clinical-stage biopharmaceutical company developing novel immunotherapies for the treatment of cancer, today reported financial results for the first quarter ended March 31, 2026, and provided a business update.

“We are encouraged by what we have seen thus far in patients treated with BDC‑4182, a next‑generation Boltbody™ ISAC. BDC-4182 has a unique mechanism of action , that has the potential to combine the power of ADCs with the durability of T-cell engagers and unlock a new frontier in cancer treatment,” said Willie Quinn, President and Chief Executive Officer. “We continue to enroll patients with gastric and gastroesophageal cancer in our ongoing clinical trial, and we look forward to reporting initial data in the third quarter of 2026.”

Recent Highlights and Anticipated Milestones

Initial clinical data from BDC-4182 Phase 1/2 study for patients with gastric and gastroesophageal cancer expected in the third quarter of 2026. BDC-4182 is a next-generation BoltbodyTM ISAC targeting claudin 18.2, a clinically validated target with expression in gastric cancer, gastroesophageal junction cancer, pancreatic cancer, and other tumor types. In preclinical models, including cancer models with low claudin 18.2 expression, BDC-4182 demonstrated significant anti-tumor activity, induced immunological memory, and outperformed cytotoxic ADCs. Bolt has implemented step-up dosing, which has been successfully used commercially for T-cell engagers, as a strategy to get to higher doses safely. The clinical trial in gastric and gastroesophageal cancers is ongoing, and the Company expects to present initial clinical data in the third quarter of 2026.

Next-generation Boltbody™ ISACs targeting CEA and PD-L1. Two additional ISAC programs in Bolt’s pipeline are currently on hold. Once BDC-4182 demonstrates proof-of-concept for the ISAC approach, Bolt plans to resume development of these programs. Both programs are close to clinical candidate selection.

o

Bolt’s CEA-targeted ISAC comprises a novel, fully human antibody with high affinity and selectivity to CEACAM5 (CEA) conjugated to a proprietary next-generation TLR7/8 agonist via a non-cleavable linker. Bolt’s CEA ISAC induced complete and durable anti-tumor responses in preclinical models and demonstrated superior activity versus a Topo1-based ADC. The CEA ISAC was well tolerated in a non-GLP toxicology study.

o

Bolt’s PD-L1 ISAC utilizes a novel human anti-PD-L1 antibody conjugated to a TLR7/8 agonist via a non-cleavable linker. This ISAC leverages a unique mechanism of action due to its ability to

target both tumor and immune cells that express PD-L1. Preclinical results demonstrated that PD-L1 ISACs represent a compelling new approach to treat cancer, leveraging mechanisms that are distinct from and potentially complementary to conventional PD-1/PD-L1 blockade with the potential for enhanced immune activation and antitumor activity.

Cash, cash equivalents, and marketable securities were $23.9 million as of March 31, 2026. Cash on hand is expected to fund operations into 2027.

First Quarter 2026 Financial Results

Collaboration Revenue – Total collaboration revenue was $26,000 for the quarter ended March 31, 2026, compared to $1.2 million for the same quarter in 2025. Revenue in the comparative periods was generated from services performed under the R&D collaborations as we fulfill our performance obligations.

Research and Development (R&D) Expenses – R&D expenses were $4.8 million for the quarter ended March 31, 2026, compared to $9.5 million for the same quarter in 2025. The decrease between the comparable periods was mainly due to a continued decrease in salary and related expenses primarily as a result of our restructuring, reduced clinical trial expenses and lower research and development expenses.

General and Administrative (G&A) Expenses – G&A expenses were $2.8 million for the quarter ended March 31, 2026, compared to $3.8 million for the same quarter in 2025. The decrease between the comparable periods was mainly due to a continued decrease in salary and related expenses primarily as a result of our restructuring.

Loss from Operations – Loss from operations was $7.6 million quarter ended March 31, 2026, compared to $12.1 million for the same quarter 2025.

About the Boltbody™ Immune-Stimulating Antibody Conjugate (ISAC) Platform

Bolt Biotherapeutics’ Boltbody ISAC platform harnesses the precision of antibodies with the power of the innate and adaptive immune system to generate a productive anti-cancer response. Each Boltbody ISAC candidate comprises a tumor-targeting antibody, a non-cleavable linker, and a proprietary immune stimulant. The antibody is designed to target one or more markers on the surface of a tumor cell and the immune stimulant is designed to recruit and activate myeloid cells. Activated myeloid cells initiate a positive feedback loop by releasing cytokines and chemokines, chemical signals that attract other immune cells and lower the activation threshold for an immune response. This increases the population of activated immune system cells in the tumor microenvironment and promotes a robust immune response with the goal of generating durable therapeutic responses for patients with cancer.

About Bolt Biotherapeutics, Inc.

Bolt Biotherapeutics is a clinical-stage biopharmaceutical company developing novel immunotherapies for the treatment of cancer. Bolt Biotherapeutics’ pipeline reflects the Company’s expertise in myeloid biology and cancer drug development. The Company’s lead program is BDC-4182, a next-generation Boltbody™ Immune-Stimulating Antibody Conjugate (ISAC) clinical candidate targeting claudin 18.2. BDC-4182 is currently in a Phase 1/2 trial that includes patients with gastric and gastroesophageal cancer. The Company has strategic collaborations with Genmab and Toray built around the Company’s Boltbody™ ISAC platform technology. The rest of the Company’s pipeline is currently on hold, including BDC-3042, a Dectin-2 agonist that completed a

first-in-human Phase 1 dose escalation trial, as well as its preclinical ISAC programs targeting CEA and PD-L1. 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 our CEA ISAC and PD-L1 ISAC, the advancement and success of our BDC-4182 clinical trials, the timing of initial data from our Phase 1 dose-escalation study of BDC-4182, the timing of our ISAC programs, 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 and ability to fund key milestones 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

BOLT BIOTHERAPEUTICS, INC.

CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS

(in thousands, except share and per share amounts)

Three Months Ended March 31,

2026

2025

Collaboration revenue

$

26

$

1,222

Operating expenses:

Research and development

4,829

9,512

General and administrative

2,798

3,825

Total operating expense

7,627

13,337

Loss from operations

(7,601

)

(12,115

)

Other income (expense), net:

Interest income, net

276

1,053

Other income, net

81

22

Total other income, net

357

1,075

Net loss

(7,244

)

(11,040

)

Net unrealized gain (loss) on marketable securities

10

(57

)

Comprehensive loss

$

(7,234

)

$

(11,097

)

Net loss per share, basic and diluted

$

(4.31

)

$

(5.76

)

Weighted-average shares outstanding, basic and diluted

1,680,445

1,916,943

BOLT BIOTHERAPEUTICS, INC.

CONSOLIDATED BALANCE SHEETS

(In thousands)

March 31,

December 31,

2026

2025

Assets

Current assets:

Cash and cash equivalents

$

11,609

$

11,703

Short-term investments

11,283

15,802

Restricted cash

200

200

Prepaid expenses and other current assets

2,660

2,555

Total current assets

25,752

30,260

Property and equipment, net

1,042

1,245

Operating lease right-of-use assets

18,564

19,230

Restricted cash, non-current

1,538

1,538

Long-term investments

1,019

4,337

Other assets

112

138

Total assets

$

48,027

$

56,748

Liabilities and stockholders' equity

Current liabilities:

Accounts payable

$

1,736

$

1,443

Accrued expenses and other current liabilities

2,021

3,717

Deferred revenue

630

449

Operating lease liabilities

2,956

2,826

Total current liabilities

7,343

8,435

Operating lease liabilities, net of current portion

19,352

20,132

Deferred revenue, non-current

1,352

1,544

Other long-term liabilities

158

132

Total liabilities

28,205

30,243

Commitments and contingencies

Stockholders' equity:

Common stock

Additional paid-in capital

487,856

487,305

Accumulated other comprehensive loss

(11

)

(21

)

Accumulated deficit

(468,023

)

(460,779

)

Total stockholders' equity

19,822

26,505

Total liabilities and stockholders' equity

$

48,027

$

56,748

BOLT BIOTHERAPEUTICS, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands)

Three Months Ended March 31,

2026

2025

CASH FLOWS FROM OPERATING ACTIVITIES:

Net loss

$

(7,244

)

$

(11,040

)

Adjustments to reconcile net loss to net cash used in operating activities:

Depreciation and amortization

203

399

Stock-based compensation expense

545

709

Accretion of discount on marketable securities

(45

)

(209

)

Gain on sale of property and equipment

(31

)

(288

)

Non-cash lease expense

666

615

Changes in operating assets and liabilities:

Prepaid expenses and other assets

(79

)

(169

)

Accounts payable and accrued expenses

(1,403

)

(2,511

)

Operating lease liabilities

(650

)

(500

)

Deferred revenue

(11

)

(503

)

Other long-term liabilities

26

132

Net cash used in operating activities

(8,023

)

(13,365

)

CASH FLOWS FROM INVESTING ACTIVITIES:

Proceeds from sales of property and equipment

31

963

Purchases of marketable securities

(1,230

)

(992

)

Maturities of marketable securities

9,122

14,580

Net cash provided by investing activities

7,923

14,551

CASH FLOWS FROM FINANCING ACTIVITIES:

Proceeds from issuance of common stock

6

Net cash provided by financing activities

6

NET (DECREASE) INCREASE IN CASH

(94

)

1,186

Cash, cash equivalents and restricted cash at beginning of year

13,441

8,970

Cash, cash equivalents and restricted cash at end of period

$

13,347

$

10,156

Reconciliation of cash, cash equivalents and restricted cash:

Cash and cash equivalents

$

11,609

$

8,391

Restricted cash

1,738

1,765

Total cash, cash equivalents and restricted cash

$

13,347

$

10,156

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dei:tradingSymbolItemType

Balance Type:

na

Period Type:

duration

X

- 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:

na

Period Type:

duration