RNAC

EX-99.1

2 exhibit991_earningsrelease.htm

EX-99.1

Document

Exhibit 99.1

Cartesian Therapeutics Reports Second Quarter 2026 Financial Results and Provides Business Update

Phase 3 AURORA trial of Descartes-08 in myasthenia gravis (MG) continues to advance; data expected in 1Q27, biologics license application (BLA) filing planned for mid-2027

Phase 2 TRITON trial of Descartes-08 in myositis on track with data from subset of patients expected in 1H27

Phase 1/2 HELIOS pediatric trial of Descartes-08 in juvenile dermatomyositis (JDM) continues to progress with data expected in 1H27

Phase 1 in vivo trial in MG patients, in partnership with WestGene BioPharma (WestGene), expected to initiate in 2H26; clinical data expected in 1H27

Approximately $149.3 million cash, cash equivalents and restricted cash as of June 30, 2026, expected to support planned operations into 2028

Frederick, Md., August 6, 2026 (GLOBE NEWSWIRE) – Cartesian Therapeutics, Inc. (NASDAQ: RNAC) (“we”, the “Company” or “Cartesian”), a late clinical-stage biotechnology company pioneering cell therapy for autoimmune diseases, today reported financial results for the second quarter ended June 30, 2026, and outlined recent business updates.

“This quarter was marked by significant progress as we secured a strategic partnership to explore an in vivo platform and executed a non-dilutive financing, enhancing our pipeline and extending cash runway. As we prepare for four expected clinical readouts over the next twelve months, including from our Phase 3 AURORA trial in patients with MG in the first quarter of 2027, these agreements further strengthen our emerging pipeline and financial position,” said Carsten Brunn, Ph.D., President and Chief Executive Officer of Cartesian. “Our partnership with WestGene gives us an efficient, accelerated path to extend our payloads into in vivo delivery, with in-human clinical data expected in the first half of next year. While our top priority remains executing on our Phase 3 AURORA trial, our WestGene partnership is intended to create future optionality for Cartesian across MG and other autoimmune indications, with the potential to further enhance cell therapy delivery and shift the treatment paradigm. As we advance toward this next phase of growth, an extended cash runway into 2028, supported by up to $150 million of non-dilutive financing through a credit facility with K2 HealthVentures (“K2HV”), allows us to continue investing in precommercial readiness activities in parallel with clinical execution. We look forward to a robust set of near-term milestones ahead, each bringing us closer to addressing the significant unmet need for deep and durable treatments in autoimmune diseases.”

Pipeline Progress and Anticipated Milestones

•Phase 3 AURORA Trial of Descartes-08 in Participants with MG; Data Expected in 1Q27, with BLA Planned for Mid-2027. The randomized, double-blind, placebo-controlled Phase 3 AURORA trial is designed to assess Descartes-08, Cartesian’s autologous anti-B cell maturation antigen (BCMA) chimeric antigen receptor T-cell therapy (CAR-T) versus placebo (1:1 randomization) administered as six once-weekly outpatient infusions without preconditioning chemotherapy in approximately 100 patients with acetylcholine receptor autoantibody positive (AChR Ab+) MG. The primary endpoint will assess the proportion of Descartes-08 participants with an improvement in MG Activities of Daily Living (MG-ADL) score of three points or more at Month 4 compared to placebo.

•Announced New Strategic Licensing Agreement with WestGene Intended to Accelerate the Development of In Vivo CAR-T Platform in Autoimmune Diseases; Phase 1 Data Expected in 1H27. Cartesian has partnered with WestGene to conduct a Phase 1 dose-escalation trial of the mRNA used in Descartes-08 delivered via WestGene’s proprietary targeted lipid nanoparticles (tLNPs) in patients with MG. Intravenous infusions will be administered across multiple dose levels using a Bayesian Optimal Interval (BOIN) adaptive design with a comprehensive translational assessment package including clinical response measures. The program represents a novel in vivo approach to BCMA-directed T-cell engineering that, if successful, could eliminate the need for ex vivo manufacturing. Cartesian is also planning to advance multiple internally developed next-generation anti-BCMA CAR constructs and a BCMA-directed T-cell engager (TCE) as part of its expanding mRNA payload portfolio. The WestGene partnership is designed to provide an efficient framework to move additional Cartesian payloads into human trials, extending the platform’s potential to generate clinical proof-of-concept data across multiple programs in several disease states. Under the terms of the agreement, WestGene received an upfront payment and is eligible to receive potential development and commercial based milestone payments. This clinical trial is expected to initiate in the second half of 2026 with in-human da

SEC.gov | Request Rate Threshold Exceeded

U.S. Securities and Exchange Commission

You’ve Exceeded the SEC’s Traffic Limit

Your request rate has exceeded the SEC’s maximum allowable requests per second. Your access to SEC.gov will be limited for 10 minutes.

Current guidelines limit each user to a total of no more than 10 requests per second, regardless of the number of machines used to submit requests. To ensure that SEC.gov remains available to all users, we reserve the right to block IP addresses that submit excessive requests.

The block will be lifted automatically by waiting 10 minutes. Continuing to exceed the SEC’s maximum allowable request rate during the time-out period will extend the duration of the time-out period. To ensure fair access for all users, please reduce the rate of your requests and visit SEC.gov again after the 10 minute time-out period has passed.

For best practices on efficiently downloading information from SEC.gov, including the latest EDGAR filings, visit sec.gov/developer. You can also sign up for email updates on the SEC open data program, including best practices that make it more efficient to download data, and SEC.gov enhancements that may impact scripted downloading processes. For more information, contact opendata@sec.gov.

For more information, please see the SEC’s Web Site Privacy and Security Policy. Thank you for your interest in the U.S. Securities and Exchange Commission.

Reference ID: 0.e618d017.1784725420.7bf60b4

More Information

Internet Security Policy

By using this site, you are agreeing to security monitoring and auditing. For security purposes, and to ensure that the public service remains available to users, this government computer system employs programs to monitor network traffic to identify unauthorized attempts to upload or change information or to otherwise cause damage, including attempts to deny service to users.

Unauthorized attempts to upload information and/or change information on any portion of this site are strictly prohibited and are subject to prosecution under the Computer Fraud and Abuse Act of 1986 and the National Information Infrastructure Protection Act of 1996 (see Title 18 U.S.C. §§ 1001 and 1030).

To ensure our website performs well for all users, the SEC monitors the frequency of requests for SEC.gov content to ensure automated searches do not impact the ability of others to access SEC.gov content. We reserve the right to block IP addresses that submit excessive requests. Current guidelines limit users to a total of no more than 10 requests per second, regardless of the number of machines used to submit requests.

If a user or application submits more than 10 requests per second, further requests from the IP address(es) may be limited for a brief period. Once the rate of requests has dropped below the threshold for 10 minutes, the user may resume accessing content on SEC.gov. This SEC practice is designed to limit excessive automated searches on SEC.gov and is not intended or expected to impact individuals browsing the SEC.gov website.

Note that this policy may change as the SEC manages SEC.gov to ensure that the website performs efficiently and remains available to all users.

Note: We do not offer technical support for developing or debugging scripted downloading processes.

rnac-202603090001453687false00014536872026-03-092026-03-09

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 9, 2026

CARTESIAN THERAPEUTICS, INC.

(Exact name of registrant as specified in its charter)

Delaware 001-37798 26-1622110 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.)

7495 New Horizon Way, Frederick, MD 21703 (Address of principal executive offices)(Zip Code)

(301) 348-8698 Registrant’s telephone number, including area code

N/A (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 classTrading Symbol(s)Name of each exchange on which registered Common Stock (Par Value $0.0001)RNACThe 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 o

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. o

Item 2.02 Results of Operations and Financial Condition. On March 9, 2026, Cartesian Therapeutics, Inc. (the “Company”) announced its financial results for the year ended December 31, 2025. The full text of the press release issued in connection with the announcement is furnished as Exhibit 99.1 to this Current Report on Form 8-K. The information in Item 2.02 of this Form 8-K, including Exhibit 99.1 attached 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. Exhibit Description

99.1Press release of Cartesian Therapeutics, Inc. issued on March 9, 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 hereunto duly authorized.

CARTESIAN THERAPEUTICS, INC.

Date: March 9, 2026By:/s/ Carsten Brunn, Ph.D. Carsten Brunn, Ph.D. President, Chief Executive Officer and Chairman of the Board