UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 VAALCO ENERGY, INC. (Name of Issuer) Common Stock (Title of Class of Securities) 91851C201 (CUSIP Number) LAWRENCE C. TUCKER Brown Brothers Harriman & Co. 59 Wall Street New York, New York (212) 483-1818 (Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications) April 21, 1998 (Date of Event which Requires Filing of this Statement) If the filing person has previously filed a statement on Schedule 13G to report the acquisition which is the subject of this Schedule 13D, and is filing this schedule because of Rule 13d-1(b)(3) or (4), check the following box [ ]. *The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page. The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes). 2 CUSIP No. 91851C201 1 NAME OF REPORTING PERSON THE 1818 FUND II, L.P. 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [X] 3 SEC USE ONLY 4 SOURCE OF FUNDS OO 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) 6 CITIZENSHIP OR PLACE OR ORGANIZATION DELAWARE 7 SOLE VOTING POWER NUMBER OF -0- SHARES 8 SHARED VOTING POWER BENEFICIALLY 31,263,441 OWNED BY 9 SOLE DISPOSITIVE POWER EACH -0- REPORTING 10 SHARED DISPOSITIVE POWER PERSON WITH 31,263,441 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 31,263,441 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 70.27% 14 TYPE OF REPORTING PERSON PN 3 CUSIP No. 91851C201 1 NAME OF REPORTING PERSON BROWN BROTHERS HARRIMAN & CO. 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [X] 3 SEC USE ONLY 4 SOURCE OF FUNDS OO 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) 6 CITIZENSHIP OR PLACE OR ORGANIZATION NEW YORK 7 SOLE VOTING POWER NUMBER OF -0- SHARES 8 SHARED VOTING POWER BENEFICIALLY 31,263,441 OWNED BY 9 SOLE DISPOSITIVE POWER EACH -0- REPORTING 10 SHARED DISPOSITIVE POWER PERSON WITH 31,263,441 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 31,263,441 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 70.27% 14 TYPE OF REPORTING PERSON PN 4 CUSIP No. 91851C201 1 NAME OF REPORTING PERSON T. MICHAEL LONG 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [X] 3 SEC USE ONLY 4 SOURCE OF FUNDS OO 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) 6 CITIZENSHIP OR PLACE OR ORGANIZATION UNITED STATES 7 SOLE VOTING POWER NUMBER OF -0- SHARES 8 SHARED VOTING POWER BENEFICIALLY 31,263,441 OWNED BY 9 SOLE DISPOSITIVE POWER EACH -0- REPORTING 10 SHARED DISPOSITIVE POWER PERSON WITH 31,263,441 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 31,263,441 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 70.27% 14 TYPE OF REPORTING PERSON IN 5 CUSIP No. 91851C201 1 NAME OF REPORTING PERSON LAWRENCE C. TUCKER 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [X] 3 SEC USE ONLY 4 SOURCE OF FUNDS OO 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) 6 CITIZENSHIP OR PLACE OR ORGANIZATION UNITED STATES 7 SOLE VOTING POWER NUMBER OF -0- SHARES 8 SHARED VOTING POWER BENEFICIALLY 31,263,441 OWNED BY 9 SOLE DISPOSITIVE POWER EACH -0- REPORTING 10 SHARED DISPOSITIVE POWER PERSON WITH 31,263,441 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 31,263,441 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 70.27% 14 TYPE OF REPORTING PERSON IN 6 Item 1. Security and Issuer. This Statement on Schedule 13D relates to the common stock, par value $.10 per share (the "Common Stock"), of Vaalco Energy, Inc., a Delaware corporation (the "Company"), whose principal executive office is located at 4600 Post Oak Place, Suite 309, Houston, Texas 77027. Item 2. Identity and Background. (a), (b), (c) and (f). This Statement on Schedule 13D is being filed by The 1818 Fund II, L.P., a Delaware limited partnership (the "Fund"), Brown Brothers Harriman & Co., a New York limited partnership and general partner of the Fund ("BBH&Co."), T. Michael Long ("Long") and Lawrence C. Tucker ("Tucker") (the Fund, BBH&Co., Long and Tucker are referred to collectively herein as the "Reporting Persons"). The Fund was formed to provide a vehicle for institutional and substantial corporate investors to acquire significant equity interests in medium-sized publicly owned United States corporations. BBH&Co. is a private bank. Pursuant to a resolution adopted by the partners of BBH&Co., BBH&Co. has designated and appointed Long and Tucker, or either of them, the sole and exclusive partners of BBH&Co. having voting power (including the power to vote or to direct the voting) and investment power (including the power to dispose or to direct the disposition) with respect to the Common Stock. 7 The address of the principal business and principal offices of the Fund and BBH&Co. is 59 Wall Street, New York, New York 10005. The business address of each of Long and Tucker is 59 Wall Street, New York, New York 10005. The present principal occupation or employment of each of Long and Tucker is as a general partner of BBH&Co. Long and Tucker are citizens of the United States. The name, business address, present principal occupation or employment (and the name, principal business and address of any corporation or other organization in which such employment is conducted) and the citizenship of each general partner of BBH&Co. is set forth on Schedule I hereto and is incorporated herein by reference. (d) and (e). During the last five years, neither any Reporting Person nor, to the best knowledge of each Reporting Person, any person identified on Schedule I has been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors) or was a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of which any such person was or is subject to a judgement, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws. 8 Item 3. Source and Amount of Funds or Other Consideration. Pursuant to a Stock Acquisition Agreement and Plan of Reorganization, dated as of February 17, 1998 and amended as of April 21, 1998 (the "Stock Acquisition Agreement"), among the Company, the Fund and 1818 Oil Corp., a Delaware corporation and wholly-owned subsidiary of the Fund ("1818 Oil"), upon the closing of the transactions contemplated by the Stock Acquisition Agreement (the "Acquisition Closing"), the Company issued, and the Fund acquired from the Company, (i) 10,000 shares of preferred stock, par value $25.00 per share (the "Preferred Stock"), of the Company and (ii) 3,763,441 shares of Common Stock. A copy of the Stock Acquisition Agreement and Amendment No. 1 thereto are attached hereto as Exhibits 1 and 2 respectively and are hereby incorporated by reference. The Fund has also entered into a Registration Rights Agreement, dated as of April 21, 1998 (the "Registration Rights Agreement"), between the Company and the Fund, pursuant to which the Company has agreed, under the terms and conditions set forth therein, to register under the Securities Act of 1933, as amended, the Common Stock issuable upon the conversion of the shares of Preferred Stock held by the Fund and all other shares of Common Stock held by the Fund. A copy of the Registration Rights Agreement is attached hereto as Exhibit 3 and is hereby incorporated by reference. The consideration paid by the Fund for the shares of Preferred Stock it purchased under the Stock Acquisition Agreement consisted of all of the issued and outstanding shares of common stock, par value $.01 per share (the "1818 Oil 9 Common Stock"), of 1818 Oil and the consideration for the shares of Common Stock it purchased under the Stock Acquisition Agreement consisted of $7,000,000 in cash.1/ The cash portion of the consideration (as well as the consideration the Fund originally paid for the shares of 1818 Oil Common Stock) was obtained by the Fund from capital contributions made by its partners pursuant to pre-existing capital commitments. Item 4. Purpose of Transaction. The Fund has acquired the securities of the Company for investment purposes only. As described below, in connection with the closing under the Stock Acquisition Agreement, the Fund acquired certain rights and privileges with respect to the Board of Directors and management of the Company which may impede the acquisition of control of the Company by any person. Pursuant to the terms of the Preferred Stock, all of the outstanding shares of which are held by the Fund, for so long as the number of outstanding shares of Preferred Stock represent (after giving effect to any adjustments) on a fully-diluted basis at least five percent (5%) of the 10 total number of shares of Common Stock outstanding, the holders of the Preferred Stock have the right to elect three members of the Board of Directors of the Company. As of the Acquisition Closing, the number of members of the Board of Directors was increased from five to eight to allow the Fund, as holder of all of the outstanding shares of Preferred Stock, to designate three individuals to be directors of the Company, and such individuals have been elected to the Board of Directors. In addition, the holders of shares of Preferred Stock vote together with the holders of shares of Common Stock on all matters submitted to the holders of Common Stock at any annual or special meeting of the Company (or any written consent in lieu thereof), including the election of directors. Accordingly, as described in Item 5 below, as of the date hereof the combined voting power of the shares of Common Stock and the shares of Preferred Stock held by the Fund would allow the Fund to control any vote submitted to the shareholders of the Company (or any written consent in lieu thereof) which requires the consent of a majority of holders of shares of Common Stock. A copy of the Certificate of Designation of the Preferred Stock is attached hereto as Exhibit 4 and is hereby incorporated by reference. Pursuant to the terms of the Stock Acquisition Agreement, the By-Laws of the Company were amended as of the Acquisition Closing to provide that the consent of at least one director elected by the class vote of the holders of shares of Preferred Stock is required for the Board of Directors to approve certain actions by the Company, including, without limitation, (i) the issuance of any equity securities of the Company or any subsidiary thereof, or rights of any kind convertible or exchangeable for any equity securities of the Company or any subsidiary thereof, or 11 any option, warrant or other subscription or purchase right with respect to equity securities of the Company or any subsidiary thereof; (ii) any transaction of merger or consolidation of the Company or any subsidiary thereof with one or more persons or any transaction of merger or consolidation of one or more persons into or with the Company or any subsidiary thereof; (iii) any sale, conveyance, exchange or transfer to another person of (x) the voting stock of the Company or any subsidiary thereof or (y) all or substantially all of the assets of the Company or any subsidiary thereof, (iv) outside of the ordinary course of business (x) any sale, conveyance, exchange, transfer or lease or other disposition to another person of any material assets, rights or properties of the Company or any subsidiary thereof or (y) any purchase, lease or other acquisition of any material assets, rights or properties of another person; (v) any amendment, modification or restatement of the Restated Certification of Incorporation or By-Laws of the Company, or the certificate of incorporation of any subsidiary of the Company (including, without limitation, a change in the number of directors which constitutes the Board of Directors). The Company has informed the Fund that, as a result of the closing under the Stock Acquisition Agreement and a separate private placement of shares of Common Stock, the Company currently does not have reserved and available for issuance such number of authorized but unissued shares of Common Stock as would 12 be sufficient to permit the conversion of all of the outstanding shares of Preferred Stock and all outstanding warrants and options with respect to the Common Stock (collectively, the "Options") into shares of Common Stock. Pursuant to a letter agreement, dated as of April 21, 1998 (the "Letter Agreement"), among the Company, the Fund, Robert L. Gerry ("Gerry") and W. Russell Scheirman ("Scheirman"), the Fund, Gerry and Scheirman (i) waived any breach by the Company of the terms of the Preferred Stock and Options held by each of them as a result of there not being a sufficient amount of Common Stock available for issuance upon the conversion or exercise of such securities; (ii) agreed not to convert a certain number of shares of Preferred Stock and Options held by each of them so that the Company would not be in breach of its obligations to other persons with respect to the Company's having a sufficient amount of authorized but unissued shares of Common Stock to allow for the conversion into Common Stock of all of the Options held by such other persons; and (iii) agreed to vote in favor of an amendment to the Restated Certificate of Incorporation of the Company to allow the Company to have reserved and available for issuance such number of shares of Common Stock as would be sufficient to allow for the conversion of all outstanding shares of Preferred Stock and all outstanding Options. A copy of the Letter Agreement is attached hereto as Exhibit 5 and is hereby incorporated by reference. The Reporting Persons may from time to time acquire additional shares of Common Stock in the open market or in privately negotiated transactions, subject to the availability of shares of Common Stock at prices deemed favorable, the Company's business or financial condition and to other factors and conditions the 13 Reporting Persons deem appropriate. Alternatively, the Reporting Persons may sell all or a portion of the shares of Common Stock or Preferred Stock in open market or in privately negotiated transactions, subject to the factors and conditions referred to above and compliance with applicable laws. Except as described in the Registration Rights Agreement and the Letter Agreement and as set forth above in this Item 4, no Reporting Person has any present plans or proposals which relate to or would result in: (a) the acquisition by any person of additional securities of the issuer, or the disposition of securities of the issuer; (b) an extraordinary corporate transaction, such as a merger, reorganization or liquidation, involving the Company or any of its subsidiaries; (c) a sale or transfer of a material amount of assets of the Company or of any of its subsidiaries; (d) any change in the present board of directors or management of the Company, including any plans or proposals to change the number or term of directors or to fill any existing vacancies on the board; (e) any material change in the present capitalization or dividend policy of the Company; (f) any other material change in the Company's business or corporate structure; (g) changes in the Company's charter, bylaws or instruments corresponding thereto or other actions which may impede the acquisition of control of the Company by any person; (h) causing a class of securities of the Company to be delisted from a national securities exchange or to cease to be authorized to be quoted in an inter-dealer quotation system of a registered national securities association; (i) a class of equity securities of the Company becoming eligible for termination of registration pursuant to Section 12(g)(4) of the Securities Exchange Act of 1934; or (j) any action similar to any of those enumerated above. 14 Item 5. Interest in Securities of the Issuer. (a) through (c). As set forth above, in connection with the closing under the Stock Acquisition Agreement the Fund acquired 10,000 shares of Preferred Stock and 3,763,441 shares of Common Stock. Accordingly, as of April 27, 1998, assuming the conversion of the shares of Preferred Stock held by the Fund into shares of Common Stock as of such date, the Fund may be deemed to own 31,263,441 shares of Common Stock, which, based on calculations made in accordance with Rule 13-d3(d) promulgated under the Securities Exchange Act of 1934, as amended, and there being 16,986,527 shares of Common Stock outstanding on April 27, 1998 (as represented to the Fund by the Company), represents 70.27% of the outstanding shares of Common Stock. By virtue of BBH&Co.'s relationship with the Fund, BBH&Co. may be deemed to beneficially own 31,263,441 shares of Common Stock, representing approximately 70.27% of the outstanding shares of Common Stock (based on the number of shares of Common Stock outstanding on April 27, 1998 as represented by the Company to the Fund). By virtue of the resolution adopted by BBH&Co. designating Long and Tucker, or either of them, as the sole and exclusive partners of BBH&Co. having voting power (including the power to vote or to direct the voting) and investment power (including the power to dispose or to direct the disposition) with respect to the securities of the Company, each of Long and Tucker may be deemed to beneficially own 33,263,441 shares of Common Stock, representing approximately 70.27% of the outstanding shares of Common Stock (based on the 15 number of shares of Common Stock outstanding on April 27, 1998 as represented by the Company to the Fund). Except as set forth above, no Reporting Person nor, to the best knowledge of each Reporting Person, any person identified on Schedule I, beneficially owns any shares of Common Stock or has effected any transaction in shares of Common Stock during the proceeding 60 days. Paragraphs (d) and (e) of Item 5 of Schedule 13D are not applicable to this filing. Item 6. Contracts, Arrangements, Understandings or Relationships with Respect to the Common Stock of the Issuer. The Company and the Fund are parties to the Registration Rights Agreement which gives the Fund, among other things, the right, on the terms and conditions set forth therein, to require the Company to register for sale to the public the shares of Common Stock issued upon the conversion of the Preferred Stock and any shares of Common stock held by the Fund. Except as described elsewhere in this Statement and as set forth in the Stock Acquisition Agreement, the Registration Rights Agreement and the Letter Agreement, copies of which are attached hereto as Exhibits 1 (and 2), 3, and 5 respectively, and incorporated herein by reference, to the best knowledge of the Reporting Persons, there exist no contracts, arrangements, understandings or relationships (legal or otherwise) among the persons named in Item 2 and between 16 such persons and any person with respect to any securities of the Company, including but not limited to transfer or voting of any securities of the Company, finder's fees, joint ventures, loan or option arrangements, puts or calls, guarantees of profits, division of profits or loss, or the giving or withholding of proxies. Item 7. Material To Be Filed as Exhibits. 1. Stock Acquisition Agreement and Plan of Reorganization, dated as of February 27, 1998, among the Company, the Fund and 1818 Oil. 2. Amendment No. 1 to the Stock Acquisition Agreement and Plan of Reorganization, dated as of April 21, 1998, among the Company, the Fund and 1818 Oil. 3. Registration Rights Agreement, dated as of April 21, 1998, between the Company and the Fund. 4. Certificate of Designation of the Preferred Stock. 5. Letter Agreement, dated April 21, 1998, among the Company, the Fund, Gerry and Scheirman. 17 SIGNATURE After reasonable inquiry and to the best of its knowledge and belief, each of the undersigned certifies that the information set forth in this statement is true, complete and correct. Dated: April 30, 1998 THE 1818 FUND II, L.P. By: Brown Brothers Harriman & Co., General Partner By: /S/ Lawrence C. Tucker ---------------------- Name: Lawrence C. Tucker Title: Partner BROWN BROTHERS HARRIMAN & CO. By: /s/ Lawrence C. Tucker ---------------------- Name: Lawrence C. Tucker Title: Partner /s/ T. Michael Long ------------------- T. Michael Long /s/ Lawrence C. Tucker ---------------------- Lawrence C. Tucker 18 SCHEDULE I Set forth below are the names and positions of all of the general partners of BBH & Co. The principal occupation or employment of each person listed below is private banker, and, unless otherwise indicated, the business address of each person is 59 Wall Street, New York, New York 10005. Unless otherwise indicated, each person listed below is a citizen of the United States. Business Address (if other than as Name indicated above) - ---- ---------------- Peter B. Bartlett Brian A. Berris Walter H. Brown Douglas A. Donahue, Jr. 40 Water Street Boston, Massachusetts 02109 Anthony T. Enders Alexander T. Ercklentz Terrence M. Farley Elbridge T. Gerry, Jr. Robert R. Gould Kyosuko Kashimoto 8-14 Nihonbashi 30-Chome Chuo-ku (citizen of Japan) Tokyo 103, Japan Radford W. Klotz Noah T. Herndon 40 Water Street Boston, Massachusetts 02109 Landon Hilliard 19 Business Address (if other than as Name indicated above) - ---- ---------------- Michael Kraynak, Jr. T. Michael Long Hampton S. Lynch Michael W. McConnell William H. Moore III Donald B. Murphy John A. Nielsen Eugene C. Rainis A. Heaton Robertson 40 Water Street Boston, Massachusetts 02109 Jeffrey A. Schoenfeld 40 Water Street Boston, Massachusetts 02109 Stokley P. Towles 40 Water Street Boston, Massachusetts 02109 Lawrence C. Tucker Maarten van Hengel Douglas C. Walker 1531 Walnut Street Philadelphia, Pennsylvania 19102 Laurence F. Whittemore Richard H. Witmer, Jr. 20 INDEX TO EXHIBITS Page Exhibit Description Number ------- ----------- ------ 1 Stock Acquisition Agreement and Plan of Reorganization, dated as of February 27, 1998, among the Company, the Fund and 1818 Oil 2 Amendment No. 1 to the Stock Acquisition Agreement and Plan of Reorganization, dated as of April 21, 1998, among the Company, the Fund and 1818 Oil 3 Registration Rights Agreement, dated as of April 21, 1998, between the Company and the Fund 4 Certificate of Designation of the Preferred Stock 5 Letter Agreement, dated April 21, 1998, among the Company, the Fund, Gerry and Scheirman