Form 8-K/A

8-K/A — Neptune Insurance Holdings Inc.

Accession: 0001628280-26-064575

Filed: 2026-10-02

Period: 2026-09-30

CIK: 0002067129

SIC: 6411 (INSURANCE AGENTS BROKERS & SERVICES)

Item: Financial Statements and Exhibits

Documents

8-K/A — np-20260930.htm (Primary)

EX-99.1 — PRESS RELEASE DATED SEPTEMBER 30, 2026 (exhibit991-davidnobleboard.htm)

XML — IDEA: XBRL DOCUMENT (R1.htm)

8-K/A

8-K/A (Primary)

Filename: np-20260930.htm · Sequence: 1

np-20260930

true000206712900020671292026-09-302026-09-30

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K/A

(Amendment No. 1)

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): September 30, 2026

NEPTUNE INSURANCE HOLDINGS INC.

(Exact name of registrant as specified in its charter)

Delaware 001-42878 33-4189588

(State or other jurisdiction

of incorporation) (Commission File Number) (IRS Employer

Identification Number)

400 6th Street S, Suite 2

St. Petersburg, Florida 33701

(Address of principal executive offices, including Zip Code)

Registrant’s telephone number, including area code: (727) 202-4815

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 Name of each exchange

on which registered

Class A Common Stock, par value $0.00001 per share NP The New York Stock Exchange

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. ☐

EXPLANATORY NOTE

This Amendment No. 1 on Form 8-K/A (this “Amendment”) amends the Current Report on Form 8-K filed by Neptune Insurance Holdings Inc. (the “Company”) with the U.S. Securities and Exchange Commission on October 1, 2026 (the “Original Report”), which reported the election of David Noble to the Company’s Board of Directors. The sole purpose of this Amendment is to furnish Exhibit 99.1, the Company’s press release dated September 30, 2026, which was inadvertently omitted from the Original Report. Other than as described above, this Amendment does not modify or update any disclosures in or exhibits to the Original Report.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits.

Exhibit No. Description

99.1 Press Release issued by Neptune Insurance Holdings Inc., dated September 30, 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, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

NEPTUNE INSURANCE HOLDINGS INC.

Date: October 2, 2026 By: /s/ Trevor Burgess

Trevor Burgess

Chief Executive Officer

EX-99.1 — PRESS RELEASE DATED SEPTEMBER 30, 2026

EX-99.1

Filename: exhibit991-davidnobleboard.htm · Sequence: 2

Document

Exhibit 99.1

Neptune Insurance Holdings Appoints David Noble to Board of Directors

Veteran advisor to CEOs and boards brings decades of leadership, strategy and financial services experience

ST. PETERSBURG, Fla., September 30, 2026 – Neptune Insurance Holdings, Inc. (NYSE: NP), the parent company of Neptune Flood Incorporated, a leading AI-native managing general agent, today announced that David Noble has been appointed as an independent member to its Board of Directors, effective September 30, 2026.

Noble founded VIEW Advisors, which advises CEOs, their leadership teams, boards of directors and investors around the world on leadership and strategy. He is a senior advisor to Egon Zehnder, and the Institute of Coaching (a Harvard Medical School affiliate) and sits on the boards of Amylu Foods and Demakes Bros. Thinkers50 has named him one of the world's top coaches for multiple years including 2026. He co-wrote Real-Time Leadership (Harvard Business Review Press).

Before VIEW Advisors, Noble was a senior executive at RBC and Morgan Stanley. His roles there included head of strategy, CEO of the world's first digital retail bank and head of the world's first digital brokerage. He later sat on the executive committees of two global strategy consultancies: as a global practice leader at Kearney and as head of Asia Pacific at Oliver Wyman. He also served on the management advisory board of TowerBrook Capital Partners, and on the boards of Wilton Brands and SFNB Bank.

"I've known David for more than 25 years, and there's no one I'd rather have in the room when the stakes are high," said Trevor Burgess, Chief Executive Officer of Neptune. "He has spent his career advising the most senior CEOs and boards in the world, and he's also built and run businesses himself, including the world's first digital bank. That combination of perspectives will be a terrific addition to our board. We have so much incredible work ahead of us, and I'm thrilled David will be part of it."

"Neptune has shown what's possible when artificial intelligence and data science are applied to one of the most underserved risks in America," said Noble. "I've watched Trevor build great companies for a long time, and I'm excited to help Neptune's board and leadership team work to grow the company and expand its reach."

About Neptune Insurance Holdings, Inc.

Neptune Insurance Holdings Inc. (NYSE: NP) is the parent company of Neptune Flood Incorporated. Neptune Flood is a leading, AI-native managing general agent offering a range of easy-to-purchase residential and commercial insurance products, including primary and excess flood insurance, distributed through a nationwide network of agencies. Leveraging proprietary artificial intelligence and advanced data science, Neptune delivers fast and accessible coverage

for residential and commercial properties across the United States. The Company operates without human underwriters, using Triton®, its cutting-edge platform to streamline underwriting, pricing, and policy issuance.

Press Contact

press@neptuneflood.com

Investor Relations Contact

investors@neptuneflood.com

XML — IDEA: XBRL DOCUMENT

XML

Filename: R1.htm · Sequence: 7

v3.26.3

Cover

Sep. 30, 2026

Cover [Abstract]

Document Type

8-K/A

Document Period End Date

Sep. 30, 2026

Entity Registrant Name

NEPTUNE INSURANCE HOLDINGS INC.

Entity Incorporation, State or Country Code

Entity File Number

001-42878

Entity Tax Identification Number

33-4189588

Entity Address, Address Line One

400 6th Street S

Entity Address, Address Line Two

Suite 2

Entity Address, City or Town

St. Petersburg

Entity Address, State or Province

Entity Address, Postal Zip Code

33701

City Area Code

727

Local Phone Number

202-4815

Written Communications

false

Soliciting Material

false

Pre-commencement Tender Offer

false

Pre-commencement Issuer Tender Offer

false

Title of 12(b) Security

Class A Common Stock, par value $0.00001 per share

Trading Symbol

Security Exchange Name

NYSE

Entity Emerging Growth Company

true

Entity Ex Transition Period

false

Amendment Flag

true

Entity Central Index Key

0002067129

Amendment Description

- Definition

Description of changes contained within amended document.

+ References

No definition available.

+ Details

Name:

dei_AmendmentDescription

Namespace Prefix:

dei_

Data Type:

xbrli:stringItemType

Balance Type:

Period Type:

duration

- Definition

Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.

+ References

No definition available.

+ Details

Name:

dei_AmendmentFlag

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Area code of city

+ References

No definition available.

+ Details

Name:

dei_CityAreaCode

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Cover page.

+ References

No definition available.

+ Details

Name:

dei_CoverAbstract

Namespace Prefix:

dei_

Data Type:

xbrli:stringItemType

Balance Type:

Period Type:

duration

- Definition

For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD.

+ References

No definition available.

+ Details

Name:

dei_DocumentPeriodEndDate

Namespace Prefix:

dei_

Data Type:

xbrli:dateItemType

Balance Type:

Period Type:

duration

- Definition

The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.

+ References

No definition available.

+ Details

Name:

dei_DocumentType

Namespace Prefix:

dei_

Data Type:

dei:submissionTypeItemType

Balance Type:

Period Type:

duration

- Definition

Address Line 1 such as Attn, Building Name, Street Name

+ References

No definition available.

+ Details

Name:

dei_EntityAddressAddressLine1

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Address Line 2 such as Street or Suite number

+ References

No definition available.

+ Details

Name:

dei_EntityAddressAddressLine2

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Name of the City or Town

+ References

No definition available.

+ Details

Name:

dei_EntityAddressCityOrTown

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Code for the postal or zip code

+ References

No definition available.

+ Details

Name:

dei_EntityAddressPostalZipCode

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Name of the state or province.

+ References

No definition available.

+ Details

Name:

dei_EntityAddressStateOrProvince

Namespace Prefix:

dei_

Data Type:

dei:stateOrProvinceItemType

Balance Type:

Period Type:

duration

- Definition

A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityCentralIndexKey

Namespace Prefix:

dei_

Data Type:

dei:centralIndexKeyItemType

Balance Type:

Period Type:

duration

- Definition

Indicate if registrant meets the emerging growth company criteria.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityEmergingGrowthCompany

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Indicate if an emerging growth company has elected not to use the extended transition period for complying with any new or revised financial accounting standards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Securities Act

-Number 7A

-Section B

-Subsection 2

+ Details

Name:

dei_EntityExTransitionPeriod

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.

+ References

No definition available.

+ Details

Name:

dei_EntityFileNumber

Namespace Prefix:

dei_

Data Type:

dei:fileNumberItemType

Balance Type:

Period Type:

duration

- Definition

Two-character EDGAR code representing the state or country of incorporation.

+ References

No definition available.

+ Details

Name:

dei_EntityIncorporationStateCountryCode

Namespace Prefix:

dei_

Data Type:

dei:edgarStateCountryItemType

Balance Type:

Period Type:

duration

- Definition

The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityRegistrantName

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityTaxIdentificationNumber

Namespace Prefix:

dei_

Data Type:

dei:employerIdItemType

Balance Type:

Period Type:

duration

- Definition

Local phone number for entity.

+ References

No definition available.

+ Details

Name:

dei_LocalPhoneNumber

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 13e

-Subsection 4c

+ Details

Name:

dei_PreCommencementIssuerTenderOffer

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 14d

-Subsection 2b

+ Details

Name:

dei_PreCommencementTenderOffer

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Title of a 12(b) registered security.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b

+ Details

Name:

dei_Security12bTitle

Namespace Prefix:

dei_

Data Type:

dei:securityTitleItemType

Balance Type:

Period Type:

duration

- Definition

Name of the Exchange on which a security is registered.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection d1-1

+ Details

Name:

dei_SecurityExchangeName

Namespace Prefix:

dei_

Data Type:

dei:edgarExchangeCodeItemType

Balance Type:

Period Type:

duration

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as soliciting material pursuant to Rule 14a-12 under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 14a

-Subsection 12

+ Details

Name:

dei_SolicitingMaterial

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Trading symbol of an instrument as listed on an exchange.

+ References

No definition available.

+ Details

Name:

dei_TradingSymbol

Namespace Prefix:

dei_

Data Type:

dei:tradingSymbolItemType

Balance Type:

Period Type:

duration

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Securities Act

-Number 230

-Section 425

+ Details

Name:

dei_WrittenCommunications

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration