Sec Form 4 Filing - KPCB XVI Associates, LLC @ Ambiq Micro, Inc. - 2025-07-31

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 KPCB XVI Associates, LLC 2. Issuer Name and Ticker or Trading Symbol Ambiq Micro, Inc. [ AMBQ] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O KLEINER PERKINS CAUFIELD & BYERS, 2750 SAND HILL ROAD 3. Date of Earliest Transaction (MM/DD/YY) 07/31/2025 (Street) MENLO PARK, CA94025 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ 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 07/31/2025 C 748,046 A 1,172,079 I By: KPCB Holdings, Inc., as nominee ( 2 ) ( 3 ) Common Stock 07/31/2025 C 98,958 A 1,271,037 I By KPCB Holdings, Inc., as nominee ( 2 ) ( 4 ) Common Stock 07/31/2025 C 23,294 A 1,294,331 I By KPCB Holdings, Inc., as nominee ( 2 ) ( 6 ) Common Stock 07/31/2025 C 194,618 A 1,488,949 I By KPCB Holdings, Inc., as nominee ( 2 ) ( 8 )

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 Series C Convertible Preferred Stock ( 1 ) 07/31/2025 C 748,046 ( 1 ) ( 1 ) Common Stock 748,046 $ 0 0 I By: KPCB Holdings, Inc., as nominee ( 2 ) ( 3 ) Series D Convertible Preferred Stock ( 1 ) 07/31/2025 C 98,958 ( 1 ) ( 1 ) Common Stock 98,958 $ 0 0 I By: KPCB Holdings, Inc., as nominee ( 2 ) ( 4 ) Series E Convertible Preferred Stock ( 5 ) 07/31/2025 C 22,594 ( 5 ) ( 5 ) Common Stock 23,294 $ 0 0 I By: KPCB Holdings, Inc., as nominee ( 2 ) ( 6 ) Series F Convertible Preferred Stock ( 7 ) 07/31/2025 C 171,064 ( 7 ) ( 7 ) Common Stock 194,618 $ 0 0 I By: KPCB Holdings, Inc., as nominee ( 2 ) ( 8 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other KPCB XVI Associates, LLC C/O KLEINER PERKINS CAUFIELD & BYERS 2750 SAND HILL ROAD MENLO PARK, CA94025 X Kleiner Perkins Caufield & Byers XVI, LLC C/O KLEINER PERKINS CAUFIELD & BYERS 2750 SAND HILL ROAD MENLO PARK, CA94025 X Signatures /s/ Susan Biglieri, Chief Financial Officer 07/31/2025 Signature of Reporting Person Date /s/ Susan Biglieri, Chief Financial Officer 07/31/2025 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The Series C Convertible Preferred Stock and Series D Convertible Preferred Stock automatically converted into Common Stock on a one-for-one basis immediately prior to the closing of the Issuer's initial public offering of common stock and had no expiration date. ( 2 )All shares are held for convenience in the name of "KPCB Holdings, Inc., as nominee" for the accounts of such individuals and entities. The managing member of Kleiner Perkins Caufield & Byers XVI, LLC ("KPCB XVI") and KPCB XVI Founders Fund, LLC ("KPCB XVI Founders") is KPCB XVI Associates, LLC ("KPCB XVI Associates"). L. John Doerr, Beth Seidenberg, Randy Komisar, Theodore E. Schlein, and Wen Hsieh, the managing members of KPCB XVI Associates, exercise shared voting and dispositive control over the shares held by KPCB XVI and KPCB XVI Founders. Such managing members disclaim beneficial ownership of all shares held by KPCB XVI and KPCB XVI Founders except to the extent of their pecuniary interest therein. ( 3 )Consists of 723,286 shares of Series C Convertible Preferred Stock held by KPCB XVI that automatically converted into 723,286 shares of Common Stock, and 24,760 shares of Series C Convertible Preferred Stock held by KPCB XVI Founders that automatically converted into 24,760 shares of Common Stock. ( 4 )Consists of 95,683 shares of Series D Convertible Preferred Stock held by KPCB XVI that automatically converted into 95,683 shares of Common Stock, and 3,275 shares of Series D Convertible Preferred Stock held by KPCB XVI Founders that automatically converted into 3,275 shares of Common Stock. ( 5 )The Series E Convertible Preferred Stock automatically converted immediately prior to the closing of the Issuer's initial public offering and had no expiration date. 22,594 outstanding shares of Series E Convertible Preferred Stock automatically converted into 23,294 shares of Common Stock. ( 6 )Consists of 21,846 shares of Series E Convertible Preferred Stock held by KPCB XVI that automatically converted into 22,523 shares of Common Stock, and 748 shares of Series E Convertible Preferred Stock held by KPCB XVI Founders that automatically converted into 771 shares of Common Stock. ( 7 )The Series F Convertible Preferred Stock automatically converted immediately prior to the closing of the Issuer's initial public offering and had no expiration date. 171,064 outstanding shares of Series F Convertible Preferred Stock automatically converted into 194,618 shares of Common Stock. ( 8 )Consists of 165,402 shares of Series F Convertible Preferred Stock held by KPCB XVI that automatically converted into 188,177 shares of Common Stock, and 5,662 shares of Series F Convertible Preferred Stock held by KPCB XVI Founders that automatically converted into 6,441 shares of Common Stock.

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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