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[8-K] Arcturus Therapeutics Holdings Inc. Reports Material Event

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8-K
Rhea-AI Filing Summary

Arcturus Therapeutics disclosed that Japanese authorities granted manufacturing and marketing approval for a new presentation of KOSTAIVE® (ARCT-2301), its self-amplifying mRNA COVID-19 vaccine targeting the SARS-CoV-2 Omicron sublineage JN.1 variant XEC. The filing notes non-clinical studies showing induction of neutralizing antibodies not only against JN.1 and XEC but also against LP.8.1 and currently circulating variants XFG and NB.1.8.1. The approved formulation is supplied as a two-dose vial with one vial per carton. The company named CSL Seqirus as the partner for distribution and sales in Japan. The disclosure is reported as Regulation FD information in this 8-K.

Arcturus Therapeutics ha comunicato che le autorità giapponesi hanno approvato la produzione e la commercializzazione di una nuova formulazione di KOSTAIVE® (ARCT-2301), il suo vaccino COVID-19 a mRNA autoamplificante mirato alla sottolinea Omicron JN.1, variante XEC. La documentazione cita studi non clinici che dimostrano l’induzione di anticorpi neutralizzanti non solo contro JN.1 e XEC, ma anche contro LP.8.1 e le varianti attualmente in circolazione XFG e NB.1.8.1. La formulazione approvata è fornita in un flacone per due dosi, con un flacone per confezione. L’azienda ha indicato CSL Seqirus come partner per la distribuzione e la vendita in Giappone. La comunicazione è stata resa come informazione ai sensi della Regulation FD in questo 8-K.

Arcturus Therapeutics informó que las autoridades japonesas aprobaron la fabricación y comercialización de una nueva presentación de KOSTAIVE® (ARCT-2301), su vacuna COVID-19 de ARNm autoamplificante dirigida a la sublinaje Omicron JN.1, variante XEC. El expediente señala estudios no clínicos que muestran la inducción de anticuerpos neutralizantes no solo contra JN.1 y XEC, sino también contra LP.8.1 y las variantes actualmente en circulación XFG y NB.1.8.1. La formulación aprobada se suministra en un vial de dos dosis, con un vial por caja. La compañía nombró a CSL Seqirus como socio para la distribución y venta en Japón. La divulgación se informa como información según la Regulation FD en este 8-K.

Arcturus Therapeutics는 일본 당국이 SARS-CoV-2 오미크론 계열 JN.1 하위계열 XEC을 표적으로 하는 자가증폭형 mRNA 코로나19 백신 KOSTAIVE® (ARCT-2301)의 새로운 제형에 대해 제조 및 판매 승인을 부여했다고 공개했습니다. 제출 문서에는 JN.1 및 XEC뿐만 아니라 LP.8.1, 현재 유행 중인 XFG 및 NB.1.8.1에 대해서도 중화항체를 유도하는 비임상 연구 결과가 포함되어 있습니다. 승인된 제형은 1 바이알당 2회 투여 분으로, 박스당 1 바이알로 제공됩니다. 회사는 일본 내 유통 및 판매 파트너로 CSL Seqirus를 지정했습니다. 이 공개는 본 8-K에서 Regulation FD 정보로 보고되었습니다.

Arcturus Therapeutics a révélé que les autorités japonaises ont accordé l’autorisation de fabrication et de commercialisation d’une nouvelle présentation de KOSTAIVE® (ARCT-2301), son vaccin COVID-19 à ARNm auto-amplifiant ciblant la sous-lignée Omicron JN.1, variante XEC. Le dossier mentionne des études non cliniques montrant l’induction d’anticorps neutralisants non seulement contre JN.1 et XEC, mais aussi contre LP.8.1 et les variants actuellement en circulation XFG et NB.1.8.1. La formulation approuvée est fournie en flacon pour deux doses, un flacon par boîte. La société a désigné CSL Seqirus comme partenaire pour la distribution et la vente au Japon. La divulgation est rapportée comme information au titre de la Regulation FD dans ce 8-K.

Arcturus Therapeutics gab bekannt, dass japanische Behörden die Herstellung und den Vertrieb einer neuen Darreichungsform von KOSTAIVE® (ARCT-2301), ihres selbstamplifizierenden mRNA-COVID-19-Impfstoffs gegen die SARS-CoV-2-Omikron-Sublinie JN.1 (Variante XEC), genehmigt haben. Die Unterlagen verweisen auf nichtklinische Studien, die die Induktion neutralisierender Antikörper nicht nur gegen JN.1 und XEC, sondern auch gegen LP.8.1 sowie gegen derzeit zirkulierende Varianten XFG und NB.1.8.1 zeigen. Die zugelassene Formulierung wird als Zwei-Dosen-Vial geliefert, ein Vial pro Karton. Das Unternehmen nannte CSL Seqirus als Partner für Vertrieb und Verkauf in Japan. Die Offenlegung erfolgte in diesem 8-K als Regulation-FD-Information.

Positive
  • Regulatory approval in Japan for a new presentation of KOSTAIVE (ARCT-2301)
  • Non-clinical data showing neutralizing antibodies against JN.1, XEC, LP.8.1, XFG and NB.1.8.1
  • Named commercial partner (CSL Seqirus) for distribution and sales in Japan
  • Approved two-dose vial formulation that may simplify inventory and dosing
Negative
  • No human clinical efficacy or safety data are provided in this disclosure
  • No commercial or financial terms disclosed for the CSL Seqirus distribution and sales arrangement
  • Regulatory approval limited to Japan; no information about other markets or global authorization

Insights

TL;DR: Japan approved Arcturus's KOSTAIVE (ARCT-2301) two-dose presentation; non-clinical data show cross-neutralizing activity against several Omicron subvariants.

The approval of a marketed presentation in Japan is a regulatory milestone validating the product's formulation and manufacturing controls for that market. Non-clinical neutralization across JN.1, XEC, LP.8.1, XFG and NB.1.8.1 suggests broad preclinical immunogenicity, but the filing contains no human clinical efficacy or safety data. For vaccine risk/benefit assessment, human trial results and post-marketing safety surveillance will be material.

TL;DR: Regulatory approval plus a distribution agreement with CSL Seqirus establishes a commercial route-to-market in Japan.

The named distribution and sales arrangement with CSL Seqirus leverages an established influenza-vaccine commercial network, which may accelerate market access and uptake. The 8-K does not disclose financial or commercial terms, launch timing, supply volumes, or reimbursement expectations, so commercial impact and revenue timing remain unclear from this filing alone.

Arcturus Therapeutics ha comunicato che le autorità giapponesi hanno approvato la produzione e la commercializzazione di una nuova formulazione di KOSTAIVE® (ARCT-2301), il suo vaccino COVID-19 a mRNA autoamplificante mirato alla sottolinea Omicron JN.1, variante XEC. La documentazione cita studi non clinici che dimostrano l’induzione di anticorpi neutralizzanti non solo contro JN.1 e XEC, ma anche contro LP.8.1 e le varianti attualmente in circolazione XFG e NB.1.8.1. La formulazione approvata è fornita in un flacone per due dosi, con un flacone per confezione. L’azienda ha indicato CSL Seqirus come partner per la distribuzione e la vendita in Giappone. La comunicazione è stata resa come informazione ai sensi della Regulation FD in questo 8-K.

Arcturus Therapeutics informó que las autoridades japonesas aprobaron la fabricación y comercialización de una nueva presentación de KOSTAIVE® (ARCT-2301), su vacuna COVID-19 de ARNm autoamplificante dirigida a la sublinaje Omicron JN.1, variante XEC. El expediente señala estudios no clínicos que muestran la inducción de anticuerpos neutralizantes no solo contra JN.1 y XEC, sino también contra LP.8.1 y las variantes actualmente en circulación XFG y NB.1.8.1. La formulación aprobada se suministra en un vial de dos dosis, con un vial por caja. La compañía nombró a CSL Seqirus como socio para la distribución y venta en Japón. La divulgación se informa como información según la Regulation FD en este 8-K.

Arcturus Therapeutics는 일본 당국이 SARS-CoV-2 오미크론 계열 JN.1 하위계열 XEC을 표적으로 하는 자가증폭형 mRNA 코로나19 백신 KOSTAIVE® (ARCT-2301)의 새로운 제형에 대해 제조 및 판매 승인을 부여했다고 공개했습니다. 제출 문서에는 JN.1 및 XEC뿐만 아니라 LP.8.1, 현재 유행 중인 XFG 및 NB.1.8.1에 대해서도 중화항체를 유도하는 비임상 연구 결과가 포함되어 있습니다. 승인된 제형은 1 바이알당 2회 투여 분으로, 박스당 1 바이알로 제공됩니다. 회사는 일본 내 유통 및 판매 파트너로 CSL Seqirus를 지정했습니다. 이 공개는 본 8-K에서 Regulation FD 정보로 보고되었습니다.

Arcturus Therapeutics a révélé que les autorités japonaises ont accordé l’autorisation de fabrication et de commercialisation d’une nouvelle présentation de KOSTAIVE® (ARCT-2301), son vaccin COVID-19 à ARNm auto-amplifiant ciblant la sous-lignée Omicron JN.1, variante XEC. Le dossier mentionne des études non cliniques montrant l’induction d’anticorps neutralisants non seulement contre JN.1 et XEC, mais aussi contre LP.8.1 et les variants actuellement en circulation XFG et NB.1.8.1. La formulation approuvée est fournie en flacon pour deux doses, un flacon par boîte. La société a désigné CSL Seqirus comme partenaire pour la distribution et la vente au Japon. La divulgation est rapportée comme information au titre de la Regulation FD dans ce 8-K.

Arcturus Therapeutics gab bekannt, dass japanische Behörden die Herstellung und den Vertrieb einer neuen Darreichungsform von KOSTAIVE® (ARCT-2301), ihres selbstamplifizierenden mRNA-COVID-19-Impfstoffs gegen die SARS-CoV-2-Omikron-Sublinie JN.1 (Variante XEC), genehmigt haben. Die Unterlagen verweisen auf nichtklinische Studien, die die Induktion neutralisierender Antikörper nicht nur gegen JN.1 und XEC, sondern auch gegen LP.8.1 sowie gegen derzeit zirkulierende Varianten XFG und NB.1.8.1 zeigen. Die zugelassene Formulierung wird als Zwei-Dosen-Vial geliefert, ein Vial pro Karton. Das Unternehmen nannte CSL Seqirus als Partner für Vertrieb und Verkauf in Japan. Die Offenlegung erfolgte in diesem 8-K als Regulation-FD-Information.

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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): August 29, 2025

 

ARCTURUS THERAPEUTICS HOLDINGS INC.

(Exact name of registrant as specified in its charter)

 

Delaware   001-38942   32-0595345
(State or other jurisdiction
of incorporation)
  (Commission
File Number)
  (I.R.S. Employer
Identification No.)

 

10628 Science Center Drive, Suite 250

San Diego, California 92121

(Address of principal executive offices)

 

Registrant’s telephone number, including area code: (858) 900-2660

 

(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, par value $0.001 per share   ARCT   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 7.01 Regulation FD Disclosure.

 

On August 29, 2025, Meiji Holdings Co., Ltd. announced that its subsidiary, Meiji Seika Pharma Co., Ltd. (“Meiji”), announced today that it has received manufacturing and marketing approval in Japan for a new presentation of KOSTAIVE® (ARCT-2301), a self-amplifying mRNA vaccine against COVID-19. The product targets the SARS-CoV-2 Omicron sub lineage JN.1 variant XEC. In non-clinical studies, it induced neutralizing antibodies not only against Omicron JN.1 and XEC, but also against LP.8.1 and the currently circulating variants XFG and NB.1.8.1. The formulation is supplied as a two-dose vial, with one vial per carton.

 

As previously announced on April 11, 2023, Meiji entered into a distribution agreement with Seqirus, Inc. (“CSL Seqirus”), a part of CSL Limited, and one of the world’s leading influenza vaccine providers, for the distribution and sales of Arcturus Therapeutics Holdings Inc.’s (the “Company” or “Arcturus”) self-amplifying mRNA vaccine candidate against COVID-19 in Japan.

 

A copy of Meiji’s press release is furnished herewith as Exhibit 99.1 and is incorporated herein by reference.

 

The information set forth in this Item 7.01, including Exhibit 99.1, is 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. The information in this Item 7.01 shall not be deemed to be incorporated by reference into any filing of the Company under the Securities Act, or the Exchange Act, whether made before or after the date hereof, except as shall be expressly set forth by specific reference in such a filing.

 

Cautionary Note Regarding Forward-Looking Statements

 

This Current Report on Form 8-K contains forward-looking statements that involve substantial risks and uncertainties for purposes of the safe harbor provided by the Private Securities Litigation Reform Act of 1995. Any statements, other than statements of historical fact included in this Current Report on Form 8-K, are forward-looking statements, including those regarding partnered programs (including the COVID-19 and flu programs partnered with CSL Seqirus (“CSL”)), the likelihood that non-clinical data will be predictive of future results, the potential supply of KOSTAIVE® in 2025 and timing therefor, and the impact of general business and economic conditions. Arcturus may not actually achieve the plans, carry out the intentions or meet the expectations or projections disclosed in any forward-looking statements such as the foregoing and you should not place undue reliance on such forward-looking statements. These statements are only current predictions or expectations, and are subject to known and unknown risks, uncertainties, and other factors that may cause our or our industry’s actual results, levels of activity, performance or achievements to be materially different from those anticipated by the forward-looking statements, including those discussed under the heading "Risk Factors" in Arcturus’ most recent Annual Report on Form 10-K, and in subsequent filings with, or submissions to, the Securities and Exchange Commission (the “SEC”), which are available on the SEC’s website at www.sec.gov. Except as otherwise required by law, Arcturus disclaims any intention or obligation to update or revise any forward-looking statements, which speak only as of the date they were made, whether as a result of new information, future events or circumstances or otherwise.

 

Item 9.01 Financial Statements and Exhibits.

 

(d) Exhibits

 

Exhibit No.   Description
99.1   Press Release dated August 29, 2025

 

 

 

 

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.

 

  Arcturus Therapeutics Holdings Inc.
Date: August 29, 2025  
     
  By:

/s/ Joseph E. Payne

  Name: Joseph E. Payne
  Title: Chief Executive Officer

 

 

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