SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 ---------- Under the Securities Exchange Act of 1934 SCHEDULE 13G INFORMATION STATEMENT PURSUANT TO RULES 13d-1 AND 13d-2 UNDER THE SECURITIES EXCHANGE ACT OF 1934 RITA MEDICAL SYSTEMS, INC. -------------------- (Name of Issuer) Common Stock, $.001 par value per share --------------------------------------- (Title of Class of Securities) 76774E103 ------------ (CUSIP Number) January 4, 2007 ------------------------------------------------------ (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedule is filed: |_| Rule 13d-1(b) |X| Rule 13d-1(c) |_| Rule 13d-1(d) Page 1 of 2 Pages SCHEDULE 13G CUSIP No. 76774E103 Page 2 of 2 Pages ------------------------------------------------------------------------------- 1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON BRENCOURT ADVISORS, LLC EIN # 13-4137530 ------------------------------------------------------------------------------- 2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) |_| (b) |X| ------------------------------------------------------------------------------- 3) SEC USE ONLY ------------------------------------------------------------------------------- 4) CITIZENSHIP OR PLACE OF ORGANIZATION Delaware ------------------------------------------------------------------------------- 5) SOLE VOTING POWER NUMBER 2,329,392 OF -------------------------------------------------- SHARES 6) SHARED VOTING POWER BENEFICIALLY OWNED BY 0 EACH -------------------------------------------------- REPORTING 7) SOLE DISPOSITIVE POWER PERSON WITH 2,329,392 -------------------------------------------------- 8) SHARED DISPOSITIVE POWER 0 ------------------------------------------------------------------------------- 9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,329,392 ------------------------------------------------------------------------------- 10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES |_| ------------------------------------------------------------------------------- 11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.31% ------------------------------------------------------------------------------- 12) TYPE OF REPORTING PERSON IA ------------------------------------------------------------------------------- Schedule 13G Item 1(a). Name of Issuer: Rita Medical Systems, Inc. Item 1(b). Address of Issuer's Principal Executive Offices: 46421 Landing Parkway Fremont, CA Item 2(a). Name of Persons Filing: Brencourt Advisors, LLC Item 2(b). Address of Principal Business Office or, if None, Residence: 600 Lexington Avenue 8th Floor New York, NY 10022 Item 2(c). Citizenship: Delaware Item 2(d). Title of Class of Securities: Common Stock, $0.01 par value per share Item 2(e). CUSIP Number: 76774E103 Item 3. If this statement is filed pursuant to ss.ss. 240.13d-1(b), or 240.13d-2(b) or (c), check whether the person filing is a: (a) |_| Broker or Dealer Registered Under Section 15 of the Act (15 U.S.C. 78o) (b) |_| Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c) (c) |_| Insurance Company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c) (d) |_| Investment Company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8) (e) |X| Investment Adviser in accordance with ss. 240.13d-1(b)(1)(ii)(E) (f) |_| Employee benefit plan or endowment fund in accordance with ss. 240.13d-1(b)(1)(ii)(F) (g) |_| Parent Holding Company or control person in accordance with ss.240.13d-1(b)(ii)(G) (h) |_| Savings Association as defined in ss.3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813) (i) |_| Church plan that is excluded from the definition of an investment company under ss.3(c)(15) of the Investment Company Act of 1940 (15 U.S.C. 80a-3) (j) |_| Group, in accordance with ss.240.13d-1(b)(ii)(J) Item 4. Ownership. (i) Brencourt Advisors, LLC (a) Amount beneficially owned: 2,329,392 (b) Percent of class: 5.31% (1) (c) Number of shares as to which such person has: (i) Sole power to vote or to direct the vote: 2,329,392 (ii) Shared power to vote or to direct the vote: 0 (iii) Sole power to dispose or to direct the disposition of: 2,329,392 (iv) Shared power to dispose or to direct the disposition of: 0 --------------- (1) Percentages are based on 43,885,857 shares of Common Stock outstanding as of December 31, 2006 (as set forth on the Issuer's most recent proxy statement). Item 5. [X] Ownership of Five Percent or Less of a Class. Item 6. Ownership of More than Five Percent on Behalf of Another Person. Not applicable. Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company. Not applicable. Item 8. Identification and Classification of Members of the Group. Not applicable. Item 9. Notice of Dissolution of Group. Not applicable. Item 10. Certification. By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having such purpose or effect. SIGNATURE ---------- After reasonable inquiry and to the best knowledge and belief of the undersigned, the undersigned certifies that the information set forth in this Statement is true, complete and correct. Dated as of January 4, 2007 Brencourt Advisors, LLC By: Michael Palmer Chief Financial Officer By: /s/ Michael Palmer --------------------------------------