Sec Form 4/A Filing - Steiner James @ Neptune Insurance Holdings Inc. - 2026-08-12

FORM 4/A Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Steiner James 2. Issuer Name and Ticker or Trading Symbol Neptune Insurance Holdings Inc. [ NP] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Chief Financial Officer (Last) (First) (Middle) C/O NEPTUNE FLOOD INCORPORATED, 400 6TH ST S STE 2 3. Date of Earliest Transaction (MM/DD/YY) 08/12/2026 (Street) SAINT PETERSBURG, FL33701 4. If Amendment, Date Original Filed (MM/DD/YY) 08/14/2026 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Class A Common Stock 08/12/2026 S 42,988 D $ 31.0755 ( 1 ) 4,341,727 ( 2 ) ( 3 ) D Class A Common Stock 08/13/2026 S 57,012 D $ 31.7121 ( 4 ) 4,284,715 ( 2 ) ( 3 ) D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Steiner James C/O NEPTUNE FLOOD INCORPORATED 400 6TH ST S STE 2 SAINT PETERSBURG, FL33701 X Chief Financial Officer Signatures James Steiner 09/16/2026 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $30.74 to $31.45, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. ( 2 )Includes 535,665 shares of Class A Common Stock underlying an award of time-based restricted stock units, as amended. The restricted stock units vest as to 178,555 shares on September 30, 2026 and as to the remaining 357,110 shares in eight quarterly installments of 44,638 or 44,639 shares each on the last day of each calendar quarter thereafter through September 30, 2028, in each case subject to the continuous service of the Reporting Person through the applicable vesting date. ( 3 )This Form 4/A amends the Form 4 filed by the Reporting Person on August 14, 2026 solely to correct the number of shares of Class A Common Stock reported in Column 5 of Table I, which inadvertently omitted 535,665 shares of Class A Common Stock underlying restricted stock units previously reported on the Form 4 filed by the Reporting Person on October 3, 2025. No other changes have been made to the previously reported information. ( 4 )The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $30.87 to $32.12, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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