FORM 4 U.S. SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP | | Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b). 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(f) of the Investment Company Act of 1940 (Print or Type Responses) 1. Name and Address of Reporting Person* 2. Issuer Name and Ticker or Trading Symbol 6. Relationship of Reporting Person(s) to Issuer SONOMA VALLEY BANCORP (Check all applicable) X Director -- 10% Owner --- Officer -- Other (give title below) (specify below) WIESE, HARRY ----------------------------------------- -------------------- -------------------- -------------------------------------- (Last) (First) (Middle) 3. I.R.S. 4. Statement for Identification (Month/Year) Number of Reporting Person, if an 03/2001 C/O SONOMA VALLEY BANCORP Entity ------------------- 202 WEST NAPA STREET (Voluntary) --------------------------------------- (Street) -- 7. Individual or Joint/Group Filing 5. If Amendment, (Check Applicable Line) Date of Original X Form filed by one Reporting Person (Month/Year) -- Form filed by More than One SONOMA, CALIFORNIA 95476 N/A Reporting Person ---------- ------------ -------- ----------------------------------------- (City) (State) (Zip)

TABLE I - NON-DERIVATIVE SECURITIES ACQUIRED, DISPOSED OF, OR BENEFICIALLY OWNED 5. Amount of 4. Securities Securities 6. Ownership 7. Nature of Acquired (A) or Beneficially Form: Direct Indirect 3. Transaction Disposed of (D) Owned at End (D) or Beneficial 1. Title of Security 2. Transaction Date Code(Instr.8.) (Instr. 3, 4 and 5) of Month Indirect (I Ownership (Instr. 3) (Mo./Day/Yr.) Code V Amount (A)or(D) Price (Instr.3,4,5) (Instr. 4) (Instr. 4) -------------------- ------------------- -------- ------- ------- -------- ------- -------------- ------------ ---------------- Common Stock 3/07/2001 S 2,000 D $20.125 32,491 D -------------------- ------------------- -------- ------- ------- -------- ------- -------------- ------------ ----------------

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). 2 FORM 4 (continued) TABLE II - DERIVATIVE SECURITIES ACQUIRED, DISPOSED OF, OR BENEFICIALLY OWNED(e.g., puts, calls, warrants, options, convertible securities) 6.Date 9.Number 10.Owner- 5.Number Exercisable 7.Title and of Deriv- ship Form of Derivitive and Expira- Amount of itive of Deriv- Securities tion Date Underlying Securities itive 4.Trans- Aquired (A) (Mo./Day/Yr.) Securities 8.Price Benefi- Security 1.Title 2.Conversion 3.Trans- action or Disposed ------------- (Instr.3 and 4) of Deri- cially Direct 11.Nature of or Exercise action Code of (D) Date ---------------- vitive owned at (D) or of Bene- Derivitive Price of Date (Instr. 8) (Instr. 3,4,5) Exer- Expira- Amount or Security End of Indirect ficial Security Derivitive (Mo./Day/ ---------- -------------- cis- tion Number of (Instr. Month (I) Ownership (Instr.3) Security Yr.) Code V A D able Date Title Shares 5) (Instr.4) (Instr. 4)(Instr.4) ---------- ------------ --------- ----- ---- ----- ------- ------- ------- ----- --------- -------- --------- ---------- -------- ---------- ------------ --------- ----- ---- ----- ------- ------- ------- ----- --------- -------- --------- ---------- --------

Explanation of Responses: **Intentional misstatements or omissions of facts constitute Federal Criminal Violations. /s/ See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a). /s/ HARRY WIESE April 10, 2001 ----------------------------------------- -------------------- Harry Wiese Date **Signature of Reporting Person Note: File three copies of this Form, one of which must be manually signed. If space provided is insufficient, see Instruction 6 for procedure.

SONOMA VALLEY BANCORP 4