Sec Form 4 Filing - HARRINGTON WILLIAM T @ Mobia Medical, Inc. - 2026-01-30

FORM 4 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 HARRINGTON WILLIAM T 2. Issuer Name and Ticker or Trading Symbol Mobia Medical, Inc. [ MOBI] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 2802 FLINTROCK TRACE, SUITE 226 3. Date of Earliest Transaction (MM/DD/YY) 01/30/2026 (Street) AUSTIN, TX78738 4. If Amendment, Date Original Filed (MM/DD/YY) 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 Common Stock 05/11/2026 C 284,324 A 284,324 I See Footnote ( 2 ) Common Stock 05/11/2026 C 264,746 A 264,746 I See Footnote ( 3 ) Common Stock 05/11/2026 C 1,455,726 A 1,740,050 I See Footnote ( 2 ) Common Stock 05/11/2026 C 872,770 A 1,137,516 I See Footnote ( 3 ) Common Stock 05/11/2026 P 266,666 A $ 15 2,006,716 I See Footnote ( 2 ) Common Stock 05/11/2026 P 266,667 A $ 15 1,404,183 I See Footnote ( 3 )

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 Convertible Notes ( 1 ) 01/30/2026( 5 ) A 3,411,892.25 ( 1 ) ( 1 ) Common Stock 284,324 $ 3,411,892.25 3,411,892.25 I See Footnote ( 2 ) Convertible Notes ( 3 ) 01/30/2026( 5 ) A 3,176,955.03 ( 1 ) ( 1 ) Common Stock 264,746 $ 3,176,955.03 3,176,955.03 I See Footnote ( 3 ) Stock Option $ 15 05/07/2026 A 31,520 ( 6 ) 05/07/2036 Common Stock 31,520 $ 0 31,520 D Convertible Notes ( 1 ) 05/11/2026 C 3,411,892.25 ( 1 ) ( 1 ) Common Stock 284,324 ( 1 ) 0 I See Footnote ( 2 ) Convertible Notes ( 1 ) 05/11/2026 C 3,176,955.03 ( 1 ) ( 1 ) Common Stock 264,746 ( 1 ) 0 I See Footnote ( 3 ) Series E-2 Preferred Stock ( 4 ) 05/11/2026 C 3,930,352 ( 4 ) ( 4 ) Common Stock 1,128,438 ( 4 ) 0 I See Footnote ( 2 ) Series F Preferred Stock ( 4 ) 05/11/2026 C 1,139,946 ( 4 ) ( 4 ) Common Stock 327,288 ( 4 ) 0 I See Footnote ( 2 ) Series F Preferred Stock ( 4 ) 05/11/2026 C 3,039,860 ( 4 ) ( 4 ) Common Stock 872,770 ( 4 ) 0 I See Footnote ( 3 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other HARRINGTON WILLIAM T 2802 FLINTROCK TRACE, SUITE 226 AUSTIN, TX78738 X X Signatures /s/ Chase Leavitt, Attorney-in-Fact 05/11/2026 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The Convertible Notes automatically converted into Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Offering"). The conversion price is the lower of (a) 80% of the Offering price per share and (b) the valuation of the Issuer immediately prior to the closing of the Offering divided by the number of fully diluted shares of capital stock (on an as-converted basis) outstanding immediately prior to Offering, excluding the Convertible Notes. ( 2 )The securities are held by Osage University Partners III, LP ("OUP III"). Osage University GP III, LLC ("OUP III GP") is the general partner of OUP III. The Reporting Person is a manager of OUP III GP and may be deemed to share voting and dispositive power over the shares held by OUP III. Each of OUP III GP and the Reporting Person disclaims beneficial ownership over the securities held by OUP III, except to the extent of their pecuniary interests therein, if any. ( 3 )The securities are held by Osage University Partners IV, LP ("OUP IV"). Osage University GP IV, LLC ("OUP IV GP") is the general partner of OUP IV. The Reporting Person is a manager of OUP IV GP and may be deemed to share voting and dispositive power over the shares held by OUP IV. Each of OUP IV GP and the Reporting Person disclaims beneficial ownership over the securities held by OUP IV, except to the extent of their pecuniary interests therein, if any. ( 4 )Each share of the Series F Preferred Stock and Series E-2 Preferred Stock converted into Common Stock immediately prior to the completion of the Offering pursuant to its terms. ( 5 )This transaction occurred prior to the Issuer's registration of a class of equity securities under Section 12 of the Securities Exchange Act of 1934, as amended, in connection with the Offering, and is reported herein pursuant to Rule 16a-2(a). ( 6 )The stock option will vest in three substantially equal installments on the first three anniversaries of the grant date.

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