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Rezolute (RZLT) gets FDA review track for congenital hyperinsulinism trial

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Rezolute announced outcomes from a recent Type B meeting with the FDA about sunRIZE, its Phase 3 trial of ersodetug for congenital hyperinsulinism. The study previously reduced hypoglycemia events but failed its primary endpoint because the benefit versus placebo was not statistically significant. FDA acknowledged challenges with behavior-driven and self-monitored glucose measures in this rare disease and reviewed continuous glucose monitoring data and open-label extension trends suggesting improved glycemic control and reduced background therapies. FDA encouraged Rezolute to submit full study reports and analysis datasets so the agency can independently determine whether evidence could support a marketing application or if more data are needed. Rezolute expects to provide a program update in the second half of 2026.

Positive

  • FDA engages on next steps instead of ending program: Despite sunRIZE missing its primary endpoint, the agency encouraged submission of full study reports and datasets for independent review, keeping a potential regulatory path open for ersodetug in congenital hyperinsulinism.
  • Supportive secondary and extension data: Rezolute highlights consistent continuous glucose monitoring improvements and preliminary favorable open-label extension observations, including better glycemic parameters and reduced background therapies, which may help bolster the efficacy case despite the primary endpoint miss.

Negative

  • Phase 3 trial failed its primary endpoint: The sunRIZE study reduced hypoglycemia events from baseline but did not achieve statistical significance versus placebo on the primary outcome, leaving substantial uncertainty around efficacy for regulatory approval.
  • Regulatory bar remains high: FDA reiterated its expectation for adequate, well-controlled outcomes as the basis for substantial evidence of efficacy, indicating that favorable exploratory and extension results alone may not be sufficient without a robust overall data package.

Insights

FDA kept the congenital HI program viable but emphasized evidence standards.

The update shows Rezolute engaging closely with FDA after sunRIZE missed its primary endpoint. Although the trial did not reach statistical significance versus placebo, continuous glucose monitoring data and open-label extension trends appear favorable for glycemic control and reduced background therapies.

FDA acknowledged behavioral and self-monitoring limitations in this heterogeneous congenital hyperinsulinism population, yet reiterated the need for adequate, well-controlled evidence. Encouraging Rezolute to submit full study reports and datasets signals the agency sees enough potential to warrant deeper review.

Future impact hinges on FDA’s independent evaluation of the complete data package. The company plans a program update in the second half of 2026, which will clarify whether a marketing application path is feasible or if additional studies or information will be required.

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 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 24, 2026

 

 

 

REZOLUTE, INC.

(Exact Name of Registrant as Specified in Charter)

 

 

 

Nevada   001-39683   27-3440894

(State or Other Jurisdiction

of Incorporation)

 

(Commission

File Number)

 

(I.R.S. Employer

Identification No.)

 

275 Shoreline Drive, Suite 500, Redwood City, CA 94065

(Address of Principal Executive Offices, and Zip Code)

 

650-206-4507

Registrant’s Telephone Number, Including Area Code

 

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 communication 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 communication pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

 

¨ Pre-commencement communication 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 $0.001 per share RZLT 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 (17 CFR §230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §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 March 24, 2026, Rezolute, Inc. (the “Company”) issued a press release to announce results from its recent meeting with the FDA.

 

The information in this Current Report on Form 8-K, including Exhibit 99.1, 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 liability 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, whether made before or after the date hereof, except as expressly set forth by specific reference in such filing to this Current Report on Form 8-K.

 

The poster contains forward looking statements. Forward-looking statements, which are based on certain assumptions and describe future plans, strategies, and expectations of the Company, are generally identified by use of words such as “anticipate,” “believe,” “estimate,” “expect,” “intend,” “plan,” “project,” “prove,” “potential,” “seek,” “strive,” “try,” or future or conditional verbs such as “predict,” “could,” “may,” “likely,” “should,” “will,” “would,” or similar expressions. The Company’s ability to predict results or the actual results of the Company’s plans or strategies is inherently uncertain. Accordingly, actual results may differ materially from anticipated results. Readers of the poster are cautioned not to place undue reliance on these forward-looking statements. Except as required by applicable law or regulation, the Company undertakes no obligation to update these forward-looking statements to reflect events or circumstances that occur after the date on which such statements were made. Important factors that may cause such a difference include any other factors discussed in the Company’s filings with the SEC, including the Risk Factors contained in the Company’s Annual Report on Form 10-K and Quarterly Reports on Form 10-Q, which are available at the SEC’s website at www.sec.gov.

 

Item 9.01Financial Statements and Exhibits.

 

(d) Exhibits.

 

Exhibit No.   Description
99.1   Press Release, dated March 24, 2026
104   Cover Page Interactive Data File (formatted as inline XBRL)

 

 

 

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.

 

  REZOLUTE, INC.
     
DATE:  March 24, 2026 By: /s/ Nevan Charles Elam
    Nevan Charles Elam
    Chief Executive Officer
     

 

 

Exhibit 99.1 

 

Rezolute Provides Update on its Congenital Hyperinsulinism Program Following FDA Meeting

 

FDA encourages the Company to submit comprehensive data from sunRIZE and the ongoing open-label extension to inform next steps for the program

 

REDWOOD CITY, Calif., March 24, 2026 – Rezolute, Inc. (Nasdaq: RZLT) (“Rezolute” or the “Company”), a late-stage rare disease company focused on treating hypoglycemia caused by all forms of hyperinsulinism (HI), today announced outcomes from an in-person Type B meeting with the U.S. Food and Drug Administration (FDA) held on March 17, 2026, related to sunRIZE, a Phase 3, multicenter, double-blind, randomized, placebo-controlled safety and efficacy study of ersodetug for the treatment of congenital HI.   

 

In December 2025, the Company reported that sunRIZE demonstrated reductions from baseline in hypoglycemia events, but the study did not meet its primary endpoint because the reductions were not statistically significant compared to placebo, which the Company believes was a result of a pronounced study effect. 

 

Although consistent and clinically significant improvements in time in hypoglycemia by continuous glucose monitoring (CGM) were observed compared to placebo over the course of the entire pivotal treatment period, nominal statistical significance was not achieved in this key secondary endpoint at the pre-specified Week 24 end-of-treatment period.  

 

During the meeting with FDA, the Company presented summary results from sunRIZE including: (i) information to support the Company’s belief that the primary endpoint was confounded as a result of behavioral factors; (ii) evidence of pharmacologic activity, as target therapeutic drug concentrations were achieved in both treatment groups with highly sensitive biomarker responses of decreased insulin cell signaling; (iii) consistent improvements compared to placebo in time in hypoglycemia and a variety of other CGM-based glycemic endpoints; and (iv) preliminary favorable observations from the ongoing open-label extension portion of the study (OLE), which indicate continued improvement in glycemic parameters in the ersodetug treatment arms and placebo roll-over, concurrent with a notable reduction of other background standard-of-care therapies.   

 

FDA acknowledged the challenges posed by the potential impact of varied behavioral factors on clinical trials in this heterogeneous patient population, including the associated limitations of self-monitored blood glucose (SMBG) based metrics in measuring hypoglycemia in congenital HI. 

 

 

 

The Company believes that the unblinded nature of self-monitored glucose necessary for patient standard of care, together with perceptions of treatment assignment, may have led to divergent behaviors between treatment groups during the study, which may have impacted the measurement of hypoglycemia by SMBG.

 

While acknowledging these challenges, the agency reiterated the expectation for adequate and well-controlled studies and outcomes as the standard for evaluating substantial evidence of efficacy criteria as the basis for approving new therapies.

 

The agency and the Company then discussed summary outcomes from various CGM-based glycemic endpoints and preliminary observations from the OLE. These and other outcomes from the pivotal portion of the sunRIZE trial will be shared by oral presentation at an upcoming scientific conference.

 

As a next step for the program, FDA encouraged the Company to submit study reports and analysis datasets for the agency’s independent evaluation. Following that review, the Company believes that a determination may be made whether there is sufficient evidence to support the submission of a marketing application for sunRIZE or if additional information is required. The Company expects to have an update on the program in the second half of 2026.   

 

“We are extremely encouraged by the outcome of our meeting with FDA including the fact that, while acknowledging their feedback was preliminary, the agency did not dismiss sunRIZE outright on the basis of not meeting its primary endpoint,” said Nevan Charles Elam, Chief Executive Officer and Founder of Rezolute. “FDA was engaged with the content we presented, asked astute questions necessary to fully understand the results, and expressed a desire to conduct a thorough review that would assist in decision making regarding advancement of the program.”

 

Mr. Elam continued, “We are grateful for FDA’s hands-on approach and look forward to continuing to work with them to hopefully find a timely path forward to make ersodetug available to patients and families in need.”   

 

“As an attendee of the meeting, I was extremely impressed observing FDA and Rezolute working together with a common understanding of theprofound burdencongenitalhyperinsulinism places on patients and caregivers, and for their commitment to advance meaningful improvements in care,”saidJulie Raskin,Chief Executive Officerof Congenital Hyperinsulinism International, an international advocacy organization.“Our communityhas long awaited new treatment options,andthis open dialogue reflects important progress toward potentially safely bringing more effective and better-toleratedtherapies.”  

 

About Ersodetug 

 

Ersodetug is a fully human monoclonal antibody that binds allosterically to the insulin receptor to decrease receptor over-activation by insulin and related substances (such as IGF-2) in the setting of hyperinsulinism (HI), thereby improving hypoglycemia. Because ersodetug acts downstream from the pancreas, it has the potential to be universally effective at treating hypoglycemia due to any congenital or acquired form of HI. 

 

 

 

About Rezolute, Inc. 

 

Rezolute is a late-stage rare disease company focused on treating hypoglycemia caused by hyperinsulinism (HI). The Company’s antibody therapy, ersodetug, is designed to treat all forms of HI and has been studied in clinical trials and used in real-world cases for the treatment of both congenital and tumor HI. For more information, visitwww.rezolutebio.com.

 

Forward-Looking Statements  

 

This release, like many written and oral communications presented by Rezolute and our authorized officers, may contain certain forward-looking statements regarding our prospective performance and strategies within the meaning of Section 27A of the Securities Act and Section 21E of the Securities Exchange Act of 1934, as amended. We intend such forward-looking statements to be covered by the safe harbor provisions for forward-looking statements contained in the Private Securities Litigation Reform Act of 1995 and are including this statement for purposes of said safe harbor provisions. Forward-looking statements, which are based on certain assumptions and describe future plans, strategies, and expectations of Rezolute, are generally identified by use of words such as "anticipate," "believe," "estimate," "expect," "intend," "plan," "project," "seek," "strive," "try," or future or conditional verbs such as "could," "may," "should," "will," "would," or similar expressions. These forward-looking statements include, but are not limited to, the potential efficacy of ersodetug in treating hypoglycemia, the timing and ability of the Company to provide study reports and analysis datasets for the FDA’s independent evaluation, the persuasiveness of the study reports and analysis datasets and the possibility of FDA agreeing to advance the congenital HI program based on those study reports and analysis datasets notwithstanding the lack of statistical significance in the sunRIZE study, the timing of any FDA response to the study reports and analysis datasets, the timing of any update on the sunRIZE program and the timing and content of any future presentations and market updates related the sunRIZE program. Our ability to predict results or the actual effects of our plans or strategies is inherently uncertain. Accordingly, actual results may differ materially from anticipated results. Readers are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date of this release. Except as required by applicable law or regulation, Rezolute undertakes no obligation to update these forward-looking statements to reflect events or circumstances that occur after the date on which such statements were made. Important factors that may cause such a difference include any other factors discussed in our filings with the SEC, including the Risk Factors contained in Rezolute’s Annual Report on Form 10-K and Quarterly Reports on Form 10-Q, which are available at the U.S. Securities and Exchange Commission’s website at www.sec.gov. You are urged to consider these factors carefully in evaluating the forward-looking statements in this release and are cautioned not to place undue reliance on such forward-looking statements, which are qualified in their entirety by this cautionary statement. 

 

 

 

Rezolute Contacts: 

 

Christen Baglaneas 

cbaglaneas@rezolutebio.com

508-272-6717 

 

Carrie McKim 

cmckim@rezolutebio.com

336-608-9706 

 

 

FAQ

What did Rezolute (RZLT) announce about its congenital hyperinsulinism program?

Rezolute reported outcomes from a Type B meeting with FDA about sunRIZE, its Phase 3 ersodetug trial. FDA reviewed summary data and encouraged submission of full study reports and analysis datasets for independent evaluation of potential next steps for the congenital hyperinsulinism program.

Did Rezolute’s sunRIZE Phase 3 study meet its primary endpoint?

No, the sunRIZE trial did not meet its primary endpoint because reductions in hypoglycemia events versus placebo were not statistically significant. Rezolute attributes this to pronounced study and behavioral effects, although reductions from baseline and supportive continuous glucose monitoring findings were observed.

How did FDA respond to Rezolute’s sunRIZE data for congenital hyperinsulinism?

FDA acknowledged challenges with behavioral factors and self-monitored glucose metrics in this heterogeneous population and reviewed continuous glucose monitoring and open-label extension data. The agency encouraged Rezolute to submit full study reports and datasets for independent review before deciding on any potential marketing application path.

What is the next regulatory step for Rezolute’s ersodetug congenital HI program?

Rezolute plans to submit comprehensive study reports and analysis datasets from sunRIZE and its open-label extension to FDA. After this independent review, a determination may be made on whether evidence supports a marketing application or if additional information or work is required.

When does Rezolute expect to provide another update on the sunRIZE program?

Rezolute expects to have an update on the congenital hyperinsulinism program in the second half of 2026. That update would likely follow FDA’s independent evaluation of the complete sunRIZE data package and help clarify the regulatory path for ersodetug.

What is ersodetug and what condition is Rezolute targeting?

Ersodetug is a fully human monoclonal antibody designed to bind allosterically to the insulin receptor and reduce over-activation in hyperinsulinism. Rezolute is developing it to treat hypoglycemia caused by congenital and acquired forms of hyperinsulinism, aiming for broad applicability across this rare disease spectrum.

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