INAB

EX-99.1

4 inab-ex99_1.htm

EX-99.1

EX-99.1

Exhibit 99.1

IN8bio Reports First Quarter 2026 Financial Results and Recent Business Highlights

• Advancing next-generation γδ T cell engager platform with initial animal data expected in 2026

• Reported glioblastoma (GBM) data showing ~97% improvement in progression-free survival vs. standard-of-care; updated median overall survival (mOS) data to be presented at ASCO 2026

• Hosting R&D Day on May 21, 2026 in New York City

NEW YORK, May 7, 2026 - IN8bio, Inc. (Nasdaq: INAB), a clinical-stage biopharmaceutical company developing innovative gamma-delta (γδ) T cell therapies and γδ T cell engagers (TCEs) for cancer and autoimmune diseases, today reported financial results and business highlights for the first quarter ended March 31, 2026.

“In the first quarter of 2026, we continued to advance our next-generation TCE platform and clinical programs,” said William Ho, Chief Executive Officer and co-founder of IN8bio. “Our encouraging GBM data positions us to engage the FDA on potential regulatory pathways forward, and we expect to deliver meaningful preclinical, regulatory and clinical milestones across our pipeline this year. As industry interest in novel TCEs accelerates, our next-generation platform is designed to address the key challenges in TCE development. We believe IN8bio is well positioned to create meaningful value for patients and shareholders in 2026 and beyond. We look forward to sharing further updates across our programs at our upcoming R&D Day in New York City on May 21, 2026.”

Key Highlights

Advancing Next-Generation Gamma-Delta T Cell Engager Platform (INB-619)

• Continued to advance our internally developed INB-600 platform of novel γδ T cell engagers, designed to potently eliminate targets such as CD19, potentially reduce toxicities such as cytokine release syndrome (CRS) and widen the therapeutic window over traditional CD3-targeting engagers.

• Presented encouraging preclinical data for INB-619, a CD19-targeting γδ T cell engager for oncology and autoimmune diseases. The data showed complete B cell depletion, robust γδ T cell expansion, and minimal CRS-associated cytokine release (IL-6, TNF-α), reinforcing the platform’s differentiation and therapeutic potential.

• Progressing INB-619 into IND-enabling studies, with initial animal data expected in 2026.

Presented Clinical Data Demonstrating Durable Survival Improvements in Newly Diagnosed Glioblastoma

In January 2026, IN8bio reported updated data as of December 31, 2025, from its Phase 1 (INB-200) and Phase 2 (INB-400) clinical trials evaluating DeltEx drug resistant immunotherapy (DRI) γδ T cells in patients with newly diagnosed GBM. The data included a concurrent standard-of-care (SOC) control group enrolled at the same time and clinical sites as treated patients.

• Median progression-free survival (mPFS) for repeat dose patients was 13.0 months versus 6.6 months for SOC patients (+97% improvement).

• Median overall survival (mOS) in repeat dose patients is still climbing, currently at 17.2+ months as of December 31, 2025, surpassing the 13.2-months for the SOC control arm.

• Several patients remained progression-free beyond two years, including one grade 4, IDH-mutant glioma patient who remains progression-free with no additional therapy for more than 4.5 years.

• No dose-limiting toxicities (DLTs), cytokine release syndrome (CRS), neurotoxicity (ICANS), tumor inflammation-associated neurotoxicity (TIAN) or other unexpected severe adverse events were reported.

• Updated mOS results to be presented at the American Society of Clinical Oncology (ASCO) 2026 Annual Meeting (Abstract 2077, Poster 442) on June 1, from 1:30 - 4:30 p.m. CDT.

IN8bio Research & Development Day 2026

• IN8bio will host its R&D Day on May 21, 2026 (9:00 - 11:30 a.m. EDT), in New York City.

• The event will feature presentations on the Company’s γδ TCE platform targeting oncology and autoimmune diseases.

• The Company will also provide updates on its clinical program in GBM, including a clinical perspective from renowned neuro-oncologist Dr. David Reardon, Director, Center for Neuro-Oncology at the Dana-Farber Cancer Institute and Professor of Medicine at Harvard Medical School.

• Register Online: https://investors.in8bio.com/news-events/events-presentations.

Upcoming Conferences & Anticipated Milestones

International Society for Cell & Gene Therapy (ISCT) 2026 Annual Meeting (Dublin, Ireland)

• Title: Unraveling Complexity: The Impact, Interactions and Outcomes of a γδ T Cell Therapy in Glioblastoma

Poster Details: 1253 Date/Time: May 7, 2026, 18:00 to 19:30 GMT (1:00 - 2:30 p.m. EDT)

• Title: Lean Infrastructure for CGT Early-Stage Companies: Leveraging Integrated Digital Platforms to Achieve Sustainable Operation Efficiency and Scalable Compliance

Poster Details: 801 Date/Time: May 7, 2026, 18:00 to 19:30 GMT (1:00 - 2:30 p.m. EDT)

American Society of Gene & Cell Therapy (ASGCT) 2026 Annual Me

8-K

0001740279false00017402792026-03-122026-03-12

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): March 12, 2026

IN8bio, Inc. (Exact name of Registrant as Specified in Its Charter)

Delaware

001-39692

82-5462585

(State or Other Jurisdiction of Incorporation)

(Commission File Number)

(IRS Employer Identification No.)

350 5th Avenue, Suite 5330

New York, New York

10118

(Address of Principal Executive Offices)

(Zip Code)

Registrant’s Telephone Number, Including Area Code: 646 600-6438

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, $0.0001 par value per share

INAB

The Nasdaq Stock Market LLC

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 March 12, 2026, IN8bio, Inc. (the “Company”) issued a press release announcing its financial results for fourth quarter and fiscal year ended December 31, 2025. A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information in this Form 8-K, including Exhibit 99.1 hereto, 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 in any 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) Exhibits.

Exhibit No.

Description

99.1

Press Release, dated March 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.

IN8bio, Inc.

Date:

March 12, 2026

By:

/s/ Patrick McCall

Patrick McCall

Chief Financial Officer and Secretary (Principal Financial and Accounting Officer)

8-K

false000174027900017402792025-11-062025-11-06

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): November 06, 2025

IN8bio, Inc. (Exact name of Registrant as Specified in Its Charter)

Delaware

001-39692

82-5462585

(State or Other Jurisdiction of Incorporation)

(Commission File Number)

(IRS Employer Identification No.)

350 5th Avenue, Suite 5330

New York, New York

10118

(Address of Principal Executive Offices)

(Zip Code)

Registrant’s Telephone Number, Including Area Code: 646 600-6438

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, $0.0001 par value per share

INAB

The Nasdaq Stock Market LLC

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 November 6, 2025, IN8bio, Inc. (the “Company”) issued a press release announcing its financial results for the third quarter ended September 30, 2025. A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

The information in this Form 8-K, including Exhibit 99.1 hereto, 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 in any 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) Exhibits.

Exhibit No.

Description

99.1

Press Release, dated November 6, 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 thereunto duly authorized.

IN8bio, Inc.

Date:

November 6, 2025

By:

/s/ Patrick McCall

Patrick McCall

Chief Financial Officer and Secretary (Principal Financial and Accounting Officer)