# EDGAR Filing Document

**Accession Number:** 0001701541
**File Stem:** 0001104659-26-065254
**Filing Date:** 2026-5
**Character Count:** 20581
**Document Hash:** 7b7991afd3ad6d6765fc471bde715b83
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-26-065254.hdr.sgml**: 20260521

**ACCESSION NUMBER**: 0001104659-26-065254

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 14

**CONFORMED PERIOD OF REPORT**: 20260521

**ITEM INFORMATION**: Regulation FD Disclosure

**ITEM INFORMATION**: Other Events

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20260521

**DATE AS OF CHANGE**: 20260521

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Black Diamond Therapeutics, Inc.
- **CENTRAL INDEX KEY:** 0001701541
- **STANDARD INDUSTRIAL CLASSIFICATION:** BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 814254660
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-39200
- **FILM NUMBER:** 261009935

**BUSINESS ADDRESS:**
- **STREET 1:** 245 FIRST STREET, 18TH FLOOR
- **CITY:** CAMBRIDGE
- **STATE:** MA
- **ZIP:** 02142
- **BUSINESS PHONE:** 617-417-5868

**MAIL ADDRESS:**
- **STREET 1:** 245 FIRST STREET, 18TH FLOOR
- **CITY:** CAMBRIDGE
- **STATE:** MA
- **ZIP:** 02142

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Aset Therapeutics, Inc.
- **DATE OF NAME CHANGE:** 20170321

?xml version='1.0' encoding='ASCII'?

**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): May 21, 2026**

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**BLACK DIAMOND THERAPEUTICS, INC.**

**(Exact name of registrant as specified in its charter)**

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| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Delaware** | &nbsp;&nbsp;**001-39200** | &nbsp;&nbsp;**81-4254660** |
| &nbsp;&nbsp;**(State or other jurisdiction** | &nbsp;&nbsp;**(Commission** | &nbsp;&nbsp;**(I.R.S. Employer** |
| &nbsp;&nbsp;**of incorporation)** | &nbsp;&nbsp;**File Number)** | &nbsp;&nbsp;**Identification No.)** |

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**245 First Street, 18th Floor**

**Cambridge, MA 02142**

**(Address of principal executive offices, including zip code)**

**(617) 252-0848**

**(Registrant's telephone number, including area code)**

**One Main Street, 14th Floor**

**Cambridge, MA 02142**

**(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:

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| |
|:---|
| 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)) |

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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, $0.0001 par value per share | BDTX | 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. ¨

**Item 7.01. Regulation FD Disclosure.**

On May 21, 2026, Black Diamond Therapeutics, Inc. (the "Company") issued a press release titled "Black Diamond Therapeutics Announces Positive Phase 2 Results for Silevertinib in Frontline NSCLC Patients with EGFR Non-Classical Mutations." 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 Item 7.01, including Exhibit 99.1 attached hereto, is intended to be furnished and 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 8.01. Other Events.**

On May 21, 2026, the Company announced results from its Phase 2 trial of silevertinib in frontline ("1L") non-small cell lung cancer ("NSCLC") patients with epidermal growth factor receptor ("EGFR") non-classical mutations ("NCMs").

***Silevertinib 1L NSCLC Phase 2 Results Summary***

Forty-three frontline NSCLC patients harboring a broad spectrum of EGFR-NCMs, including compound and P-Loop and C-Helix Compressing ("PACC") mutations, were enrolled, including 19 patients with brain metastases, seven of whom had measurable central nervous system ("CNS") target lesions. All patients were enrolled at a 200 mg oral daily dose ("QD") of silevertinib. Efficacy and safety were assessed with an April 11, 2026 data cutoff date; median follow-up time as of this date was 11.2 months, and the study remains ongoing.

Key data highlights include:

&nbsp;&nbsp;&nbsp;&nbsp;· Durability

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Preliminary median progression-free survival is 15.2 months (95% CI: 10.8, NE)

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Median duration of response ("DOR") had not been reached (95% CI: 7.0, NE)

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o 23 of 43 patients (53%) remain on therapy, with longest at 23.5 months

&nbsp;&nbsp;&nbsp;&nbsp;· CNS Activity

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o No patients developed *de novo* brain metastases

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Previously disclosed CNS Objective Response Rate ("ORR") (ORR by RANO-BM) remained at 86%

&nbsp;&nbsp;&nbsp;&nbsp;· ORR and DCR

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Previously disclosed ORR (ORR by RECIST 1.1) and Disease Control Rate ("DCR") remained at 60% and 91%, respectively

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Variant allele frequency reduction observed in all evaluable patients across 25 unique EGFR-NCMs, including PACC

&nbsp;&nbsp;&nbsp;&nbsp;· Safety

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o No new safety signals were observed

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o The rate of treatment-related adverse events <u>></u> Grade 3 was reduced to 28% following dose reduction

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Patients maintained or deepened clinical responses after dose reduction

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Safety and efficacy data support 150 mg QD for pivotal development

***Forward-Looking Statements***

Statements contained in this Current Report on Form 8-K regarding matters that are not historical facts are "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. Because such statements are subject to risks and uncertainties, actual results may differ materially from those expressed or implied by such forward-looking statements. Such statements include, but are not limited to, statements regarding: the continued development and advancement of silevertinib, including the ongoing Phase 2 clinical trials and the timing of clinical updates for silevertinib in patients with NSCLC and in patients with GBM, the potential of silevertinib to address the unmet medical need for newly diagnosed GBM patients and newly diagnosed NSCLC patients with non-classical EGFR mutations and benefit patients with NSCLC across multiple lines of therapy, the potential future development plans for silevertinib in NSCLC and GBM, and the competitive landscape and market for silevertinib or any of the Company's other current or future product candidates, including statements relating to the estimated percentage of newly diagnosed NSCLC patients with non-classical EGFR mutations and the potential addressable patient population. Any forward-looking statements in this Current Report on Form 8-K are based on management's current expectations of future events and are subject to a number of risks and uncertainties that could cause actual results to differ materially and adversely from those set forth in or implied by such forward-looking statements. Risks that contribute to the uncertain nature of the forward-looking statements include those risks and uncertainties set forth in the Company's Annual Report on Form 10-K for the year ended December 31, 2025, filed with the United States Securities and Exchange Commission (the "SEC") and in its subsequent filings filed with the SEC. All forward-looking statements contained in this press release speak only as of the date on which they were made. The Company undertakes no obligation to update such statements to reflect events that occur or circumstances that exist after the date on which they were made.

**Item 9.01. Financial Statements and Exhibits.**

(d) Exhibits:

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| | |
|:---|:---|
| **Exhibit No.** | **Description** |
| [99.1](tm2615293d1_ex99-1.htm) | [Press Release issued by Black Diamond Therapeutics, Inc. dated May 21, 2026.](tm2615293d1_ex99-1.htm) |
| 104 | Cover Page Interactive Data File (embedded within the Inline XBRL document). |

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**SIGNATURE**

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.

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| | | |
|:---|:---|:---|
|  | Black Diamond Therapeutics, Inc. | Black Diamond Therapeutics, Inc. |
| Date: May 21, 2026 | By: | /s/ Brent Hatzis-Schoch |
|  |  | Brent Hatzis-Schoch |
|  |  | Chief Operating Officer and General Counsel |

---

## Exhibit 99.1

**Exhibit 99.1**

![](tm2615293d1_ex99-1img001.jpg)

**Black Diamond Therapeutics Announces Positive Phase 2 Results for Silevertinib in Frontline NSCLC Patients with EGFR Non-Classical Mutations**

&nbsp;&nbsp;&nbsp;&nbsp;· *Preliminary mPFS of 15.2 months; mDOR not reached* 

&nbsp;&nbsp;&nbsp;&nbsp;· *Robust CNS activity, with 86% CNS ORR; no patients developed de novo brain metastases* 

&nbsp;&nbsp;&nbsp;&nbsp;· *ORR 60% in patients with a broad spectrum of EGFR-NCMs, including PACC* 

&nbsp;&nbsp;&nbsp;&nbsp;· *Dose dependent and manageable AE profile, no new safety signals observed* 

&nbsp;&nbsp;&nbsp;&nbsp;· *Webcast on Thursday, May 21, 2026 at 5:30 pm EDT* 

**CAMBRIDGE, MA,** *May 21, 2026* (GLOBE NEWSWIRE) – Black Diamond Therapeutics, Inc. (Nasdaq: BDTX), a clinical-stage oncology company developing MasterKey therapies that target families of oncogenic mutations in patients with cancer, today announced positive results from its Phase 2 trial of silevertinib in frontline (1L) non-small cell lung cancer (NSCLC) patients with epidermal growth factor receptor (EGFR) non-classical mutations (NCMs). These data will be presented by Julia Rotow, M.D., Clinical Director, Lowe Center for Thoracic Oncology at the Dana-Farber Cancer Institute, at the 2026 American Society of Clinical Oncology® (ASCO®) Annual Meeting on Saturday, May 30, 2026, 1:15 PM-2:45 PM CDT.

"Silevertinib continues to demonstrate potential to become a practice changing frontline therapy for NSCLC patients with EGFR-NCMs, delivering robust preliminary mPFS that far exceeds historical data for currently available therapies" said Sergey Yurasov, M.D., Ph.D., Chief Medical Officer of Black Diamond Therapeutics. "Importantly, silevertinib prevented the development of *de novo* brain metastases in this patient population, where progression via CNS metastases frequently occurs. We look forward to meeting with the FDA later this year to discuss our pivotal development plan."

"Patients with EGFR non-classical mutations represent a meaningful and underserved subset of NSCLC, with historically poor progression-free survival on available frontline TKIs," added Dr. Rotow. "The activity we are seeing with silevertinib across the full NCM spectrum, combined with its CNS activity, is highly encouraging, and I look forward to sharing these data with the oncology community at ASCO next week."

**Silevertinib 1L NSCLC Phase 2 Results Summary**

Results as of an April 11, 2026 data cutoff date include:

&nbsp;&nbsp;&nbsp;&nbsp;· 43
 patients with 1L NSCLC were enrolled at a 200 mg once daily dose of silevertinib

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Patients
 presented with a broad spectrum of EGFR-NCMs, including compound and P-Loop and C-Helix Compressing
 (PACC) mutations

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o 19
 patients with brain metastases, 7 of whom had measurable central nervous system (CNS) target
 lesions

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o 11.2
 months median follow-up

&nbsp;&nbsp;&nbsp;&nbsp;· Durability

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Preliminary
 median Progression-free Survival (mPFS) is 15.2 months (95% CI: 10.8; NE)

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Median
 duration of response (DOR) had not been reached (95%CI: 7.0, NE)

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o 23
 of 43 patients (53%) remain on therapy, with longest at 23.5 months

&nbsp;&nbsp;&nbsp;&nbsp;· CNS
 Activity

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o No
 patients developed *de novo* brain metastases

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Previously
 disclosed CNS Objective Response Rate (ORR by RANO-BM) remained at 86%

&nbsp;&nbsp;&nbsp;&nbsp;· ORR
 and DCR

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Previously
 disclosed Objective Response Rate (ORR by RECIST 1.1) and Disease Control Rate (DCR) remained
 at 60% and 91%, respectively

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Variant
 allele frequency (VAF) reduction observed in all evaluable patients across 25 unique EGFR-NCMs,
 including PACC

&nbsp;&nbsp;&nbsp;&nbsp;· Safety

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o No
 new safety signals were observed

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o The
 rate of TRAEs <u>></u> Grade 3 was reduced to 28% following dose reduction

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Patients
 maintained or deepened clinical responses after dose reduction

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Safety
 and efficacy data support 150 mg QD for pivotal development

**ASCO Abstract:** 8519

**Title:** Safety and efficacy results of the phase 2 study of silevertinib (BDTX-1535) in treatment-naïve patients with non-small cell lung cancer with non-classical EGFR mutations

**Presenter**: Julia Rotow, M.D., Clinical Director, Lowe Center for Thoracic Oncology at Dana-Farber Cancer Institute

**Date and Time**: May 30, 2026, 1:15 PM-2:45 PM CDT (slides will be available at the time of the presentation on the Black Diamond website)

**Company Webcast Information**

Black Diamond will hold a webcast for investors on Thursday, May 21, 2026 at 5:30 p.m. EDT. The webcast can be accessed under "Events and Presentations" on the Investors section of the Black Diamond website at www.blackdiamondtherapeutics.com.

**About Silevertinib**

Silevertinib is an investigational oral, covalent, brain-penetrant fourth-generation tyrosine kinase inhibitor (TKI) that selectively targets classical and more than 50 non-classical EGFR mutations in NSCLC. It is also designed to potently inhibit key EGFR alterations seen in GBM, including EGFRvIII, while avoiding the paradoxical EGFR activation reported with reversible TKIs. To date, over 200 patients with EGFR-mutant NSCLC or EGFR-altered GBM have been treated with silevertinib.

In addition to the ongoing Phase 2 trial of silevertinib in patients with EGFRm NSCLC, the Company also initiated a randomized Phase 2 trial of silevertinib in patients with newly diagnosed EGFRvIII-positive GBM (NCT07326566) in May 2026.

**About Black Diamond Therapeutics**

Black Diamond Therapeutics is a clinical-stage oncology company developing MasterKey therapies that target families of oncogenic mutations in patients with cancer. The Company's MasterKey therapies are designed to address a broad spectrum of genetically defined tumors, overcome resistance, minimize wild-type mediated toxicities, and be brain penetrant to treat central nervous system disease. The Company is advancing silevertinib, an investigational brain-penetrant fourth-generation EGFR MasterKey inhibitor targeting EGFR-mutant NSCLC and GBM. For more information, please visit <u>www.blackdiamondtherapeutics.com</u>.

From time to time, we may use our website or our LinkedIn profile at www.linkedin.com/company/black-diamond-therapeutics to distribute material information. Our financial and other material information is routinely posted to and accessible on the Investors section of our website, available at www.blackdiamondtherapeutics.com. Investors are encouraged to review the Investors section of our website because we may post material information on that site that is not otherwise disseminated by us. Information that is contained in and can be accessed through our website or our LinkedIn page is not incorporated into, and does not form a part of, this press release.

**Forward-Looking Statements**

Statements contained in this press release regarding matters that are not historical facts are "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. Because such statements are subject to risks and uncertainties, actual results may differ materially from those expressed or implied by such forward-looking statements. Such statements include, but are not limited to, statements regarding: the continued development and advancement of silevertinib, including the ongoing Phase 2 clinical trials and the timing of clinical updates for silevertinib in patients with NSCLC and in patients with GBM, the potential of silevertinib to address the unmet medical need for newly diagnosed GBM patients and newly diagnosed NSCLC patients with non-classical EGFR mutations and benefit patients with NSCLC across multiple lines of therapy, the potential future development plans for silevertinib in NSCLC and GBM, and the competitive landscape and market for silevertinib or any of the Company's other current or future product candidates, including statements relating to the estimated percentage of newly diagnosed NSCLC patients with non-classical EGFR mutations and the potential addressable patient population. Any forward-looking statements in this press release are based on management's current expectations of future events and are subject to a number of risks and uncertainties that could cause actual results to differ materially and adversely from those set forth in or implied by such forward-looking statements. Risks that contribute to the uncertain nature of the forward-looking statements include those risks and uncertainties set forth in its Annual Report on Form 10-K for the year ended December 31, 2025, filed with the United States Securities and Exchange Commission and in its subsequent filings filed with the United States Securities and Exchange Commission. All forward-looking statements contained in this press release speak only as of the date on which they were made. The Company undertakes no obligation to update such statements to reflect events that occur or circumstances that exist after the date on which they were made.

**Contact**

For Investors:

<u>investors@bdtx.com</u>

For Media:

<u>media@bdtx.com</u>