============================================================================= SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 WILLBROS GROUP, INC. ------------------------------------------------------- (Exact name of registrant as specified in its charter) Republic of Panama 98-0160660 - ---------------------------------------- ------------------------------------ (State of incorporation or organization) (I.R.S. Employer Identification No.) Dresdner Bank Building 50th Street, 8th Floor P. O. Box 850048 Panama 5, Republic of Panama - ---------------------------------------- (Address of principal executive offices) Securities to be registered pursuant to Section 12(b) of the Act: Title of each class Name of each exchange on which to be so registered each class is to be registered ---------------------- ------------------------------ Preferred Share Purchase Rights New York Stock Exchange If this Form relates to the registration of a class of securities pursuant to Section 12(b) of the Exchange Act and is effective pursuant to General Instruction A.(c), check the following box. X --- If this Form relates to the registration of a class of securities pursuant to Section 12(g) of the Exchange Act and is effective pursuant to General Instruction A.(d), check the following box. --- Securities Act registration statement file number to which this form relates: ----------------------- (if applicable) Securities to be registered pursuant to Section 12(g) of the Act: None ------------------------------- (Title of class) ============================================================================= Item 1. Description of Registrant's Securities to be Registered. On April 1, 1999, the Board of Directors of Willbros Group, Inc. (the "Corporation") declared a distribution of one preferred share purchase right (a "Right") for each outstanding share of Common Stock, par value $.05 per share (the "Common Shares"), of the Corporation. The distribution is payable to the stockholders of record of the Corporation on April 15, 1999 (the "Record Date"), and with respect to Common Shares issued thereafter until the Distribution Date (as defined below) and, in certain circumstances, with respect to Common Shares issued after the Distribution Date. Except as set forth below, each Right, when it becomes exercisable, entitles the registered holder to purchase from the Corporation one one-thousandth of a share of Series A Junior Participating Preferred Stock, with a par value of $.01 per share, of the Corporation (the "Preferred Shares") at a price of $30.00 per one one-thousandth of a Preferred Share (the "Purchase Price"), subject to adjustment. The description and terms of the Rights are set forth in a Rights Agreement, as the same may be amended from time to time (the "Rights Agreement"), between the Corporation and ChaseMellon Shareholder Services, L.L.C., as Rights Agent, dated as of April 1, 1999. Initially, the Rights will be attached to all certificates representing Common Shares then outstanding, and no separate Right Certificates will be distributed. The Rights will separate from the Common Shares upon the earlier to occur of (i) the first date of public announcement of a person or group of affiliated or associated persons having acquired beneficial ownership of 15 percent or more of the outstanding Common Shares (except pursuant to a Permitted Offer, as hereinafter defined); or (ii) 10 days (or such later date as the Board of Directors of the Corporation (the "Board") may determine) following the commencement of, or announcement of an intention to make, a tender offer or exchange offer the consummation of which would result in a person or group becoming an Acquiring Person (as hereinafter defined) (the earlier of such dates being called the "Distribution Date"). A person or group whose acquisition of Common Shares causes a Distribution Date pursuant to clause (i) above is an "Acquiring Person." The first date of public announcement that a person or group has become an Acquiring Person is the "Shares Acquisition Date." The Rights Agreement provides that, until the Distribution Date, the Rights will be transferred with and only with the Common Shares. Until the Distribution Date (or earlier redemption or expiration of the Rights) new Common Share certificates issued after the Record Date upon transfer or new issuance of Common Shares will contain a notation incorporating the Rights Agreement by reference. Until the Distribution Date (or earlier redemption or expiration of the Rights), the surrender for transfer of any certificates for Common Shares outstanding as of the Record Date, even without such notation or a copy of this Summary of Rights being attached thereto, will also constitute the transfer of the Rights associated with the Common Shares represented by such certificate. As soon as practicable following the Distribution Date, separate certificates evidencing the Rights ("Right Certificates") will be mailed to holders of record of the Common Shares as of the close of business on the Distribution Date (and to each initial record holder of certain Common Shares issued after the Distribution Date), and such separate Right Certificates alone will evidence the Rights. The Rights are not exercisable until the Distribution Date and will expire at the close of business on April 15, 2009, unless earlier redeemed or exchanged by the Corporation as described below. -2- In the event that any person or group becomes an Acquiring Person (except pursuant to a tender or exchange offer which is for all outstanding Common Shares at a price and on terms which a majority of certain members of the Board determines to be adequate and in the best interests of the Corporation, its stockholders and other relevant constituencies, other than such Acquiring Person, its affiliates and associates (a "Permitted Offer")), each holder of a Right will thereafter have the right (the "Flip-In Right") to receive upon exercise the number of Common Shares or of one onethousandths of a share of Preferred Shares (or, in certain circumstances, other securities of the Corporation) having a value (immediately prior to such triggering event) equal to two times the exercise price of the Right. Notwithstanding the foregoing, following the occurrence of the event described above, all Rights that are, or (under certain circumstances specified in the Rights Agreement) were, beneficially owned by any Acquiring Person or any affiliate or associate thereof will be null and void. In the event that, at any time following the Shares Acquisition Date, (i) the Corporation is acquired in a merger or other business combination transaction in which the holders of all of the outstanding Common Shares immediately prior to the consummation of the transaction are not the holders of all of the surviving corporation's voting power, or (ii) more than 50 percent of the Corporation's assets or earning power is sold or transferred, then each holder of a Right (except Rights which previously have been voided as set forth above) shall thereafter have the right (the "Flip-Over Right") to receive, upon exercise, common shares of the acquiring company having a value equal to two times the exercise price of the Right. The holder of a Right will continue to have the Flip-Over Right whether or not such holder exercises or surrenders the Flip-In Right. The Purchase Price payable, and the number of Preferred Shares, Common Shares or other securities issuable, upon exercise of the Rights are subject to adjustment from time to time to prevent dilution (i) in the event of a stock dividend on, or a subdivision, combination or reclassification of, the Preferred Shares, (ii) upon the grant to holders of the Preferred Shares of certain rights or warrants to subscribe for or purchase Preferred Shares at a price, or securities convertible into Preferred Shares with a conversion price, less than the then current market price of the Preferred Shares, or (iii) upon the distribution to holders of the Preferred Shares of evidences of indebtedness or assets (excluding regular quarterly cash dividends) or of subscription rights or warrants (other than those referred to above). The Purchase Price and number of outstanding Rights are also subject to adjustment in the event of a stock split of the Common Shares or a stock dividend on the Common Shares payable in Common Shares or subdivisions, consolidations or combinations of the Common Shares occurring, in any such case, prior to the Distribution Date. Preferred Shares purchasable upon exercise of the Rights will not be redeemable. Each Preferred Share will be entitled to a minimum preferential quarterly dividend payment of $10.00 per share but, if greater, will be entitled to an aggregate dividend per share of 1,000 times the dividend declared per Common Share. In the event of liquidation, the holders of the Preferred Shares will be entitled to a minimum preferential liquidation payment of $1,000 per share; thereafter, and after the holders of the Common Shares receive a liquidation payment of $1.00 per share, the holders of the Preferred Shares and the holders of the Common Shares will share the remaining assets in the ratio of 1,000 to 1 (as adjusted) for each Preferred Share and Common Share so held, respectively. Each Preferred Share will have 1,000 votes, voting together with the Common Shares. Finally, in the event of any merger, consolidation or other transaction in which Common Shares are exchanged, -3- each Preferred Share will be entitled to receive 1,000 times the amount received per Common Share. These rights are protected by customary antidilution provisions. In the event that the amount of accrued and unpaid dividends on the Preferred Shares is equivalent to six full quarterly dividends or more, the holders of the Preferred Shares shall have the right, voting as a class, to elect two directors in addition to the directors elected by the holders of the Common Shares until all cumulative dividends on the Preferred Shares have been paid through the last quarterly dividend payment date or until non-cumulative dividends have been paid regularly for at least one year. With certain exceptions, no adjustment in the Purchase Price will be required until cumulative adjustments require an adjustment of at least 1percent in such Purchase Price. No fractional Preferred Shares will be issued (other than fractions which are one one-thousandth or integral multiples of one one- thousandth of a Preferred Share, which may, at the election of the Board, be evidenced by depositary receipts) and in lieu thereof, an adjustment in cash will be made based on the market price of the Preferred Shares on the last trading day prior to the date of exercise. At any time prior to the earlier to occur of (i) a person becoming an Acquiring Person or (ii) the expiration of the Rights, and under certain other circumstances, the Corporation may redeem the Rights in whole, but not in part, at a price of $.005 per Right (the "Redemption Price") which redemption shall be effective upon the action of the Board. Additionally, following the Shares Acquisition Date, the Corporation may redeem the then outstanding Rights in whole, but not in part, at the Redemption Price, provided that such redemption is in connection with a merger or other business combination transaction or series of transactions involving the Corporation in which all holders of Common Shares are treated alike but not involving an Acquiring Person or its affiliates or associates. At any time after any person or group becomes an Acquiring Person and prior to the acquisition by such person or group of 50 percent or more of the outstanding Common Shares, the Board may exchange the Rights (other than Rights owned by the Acquiring Person, which will have become void), in whole or in part, at an exchange ratio of one Common Share, or one one-thousandth of a Preferred Share (or of a share of a class or series of the Corporation's preferred stock having equivalent rights, preferences and privileges), per Right (subject to adjustment). All of the provisions of the Rights Agreement may be amended by the Board prior to the Distribution Date. After the Distribution Date, the provisions of the Rights Agreement may be amended by the Board only in order to cure any ambiguity, defect or inconsistency, to make changes which do not adversely affect the interests of holders of Rights (excluding the interests of any Acquiring Person), or, subject to certain limitations, to shorten or lengthen any time period under the Rights Agreement. Until a Right is exercised or exchanged, the holder thereof, as such, will have no right to vote or receive dividends or other distributions and will have no other rights as a stockholder of the Corporation. While the distribution of the Rights will not be taxable to stockholders of the Corporation, stockholders may, depending upon the circumstances, recognize taxable income should the Rights become exercisable or upon the occurrence of certain events thereafter. The Rights Agreement between the Corporation and the Rights Agent specifying the terms of the Rights, which includes as Exhibit A the form of Certificate of Designation of Series A Junior Participating Preferred Stock of the Corporation, as Exhibit B the form of Right Certificate and as -4- Exhibit C the Summary of Rights to Purchase Preferred Shares, is attached hereto as an exhibit and incorporated herein by reference. The foregoing description of the Rights is qualified by reference to such exhibit. Item 2. Exhibits. 4.1 Rights Agreement, dated as of April 1, 1999, between Willbros Group, Inc. and ChaseMellon Shareholder Services, L.L.C., as Rights Agent, together with the following exhibits thereto: Exhibit A- Form of Certificate of Designation of Series A Junior Participating Preferred Stock of Willbros Group, Inc.; Exhibit B-Form of Right Certificate; Exhibit C-Summary of Rights to Purchase Preferred Shares of Willbros Group, Inc. SIGNATURE Pursuant to the requirements of Section 12 of the Securities Exchange Act of 1934, the registrant has duly caused this registration statement to be signed on its behalf by the undersigned, thereto duly authorized. Date: April 9, 1999 WILLBROS GROUP, INC. By: /s/ Melvin F. Spreitzer ------------------------------------- Melvin F. Spreitzer Executive Vice President, Chief Financial Officer and Treasurer -5- EXHIBIT INDEX Exhibit Number Description - -------------- ----------- 4.1 Rights Agreement, dated as of April 1, 1999, between Willbros Group, Inc. and ChaseMellon Shareholder Services, L.L.C., as Rights Agent, together with the following exhibits thereto: Exhibit A-Form of Certificate of Designation of Series A Junior Participating Preferred Stock of Willbros Group, Inc.; Exhibit B-Form of Right Certificate; Exhibit C-Summary of Rights to Purchase Preferred Shares of Willbros Group, Inc.