1 SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-A/A For Registration of Certain Classes of Securities Pursuant to Section 12(b) or (g) of the Securities Exchange Act of 1934 ADMINISTAFF, INC. (Exact name of registrant as specified in its charter) DELAWARE 76-0479645 (State of incorporation (I.R.S. Employer or organization) Identification No.) 19001 CRESCENT SPRINGS DRIVE KINGWOOD, TEXAS 77339-3802 (address of principal executive offices) (Zip Code) (281) 358-8986 (Registrant's telephone number, including area code) 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 -------------------- ------------------------------ Rights to purchase Series A New York Stock Exchange Junior Participating Preferred Stock Securities to be registered pursuant to Section 12(g) of the Act: None ---------------- (Title of Class) 2 ITEM 1. DESCRIPTION OF REGISTRANT'S SECURITIES TO BE REGISTERED AMENDMENTS TO RIGHTS AGREEMENT On July 22, 1999, the Board of Directors of Administaff, Inc. (the "Company") approved an amendment ("Amendment No. 3") to the Rights Agreement (the "Rights Agreement") between the Company and Harris Trust and Savings Bank, as Rights Agent (the "Rights Agent"), and on August 2, 1999, the Board of Directors of the Company approved a second amendment ("Amendment No. 4") to the Rights Agreement. Amendment No. 3 provided that the Gerhard Stockholders (as defined in the Amendment) would continue to be an "Exempt Person" under the Rights Agreement for the period up to and including August 2, 1999. Amendment No. 4 amended the definition of "Exempt Person" under the Rights Agreement to allow for the increased percentage ownership in the Company, subject to certain limitations, of the Gerhard Stockholders. The Amendments are filed herewith as Exhibit 1 and Exhibit 2, and are incorporated herein by reference. ITEM 2. EXHIBITS 1. Amendment No. 3 to Rights Agreement dated as of July 22, 1999, between Administaff, Inc. and Harris Trust and Savings Bank, as Rights Agent. 2. Amendment No. 4 to Rights Agreement, dated as of August 2, 1999, between Administaff, Inc. and Harris Trust and Savings Bank, as Rights Agent. -2- 3 SIGNATURE Pursuant to the requirements of Section 12 of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this Registration Statement on Form 8-A/A to be signed on its behalf by the undersigned, thereunto duly authorized. Dated: August 9, 1999 ADMINISTAFF, INC. By: /s/ John H. Spurgin, II ---------------------------------------- John H. Spurgin, II Vice President - Legal, General Counsel and Secretary -3- 4 INDEX TO EXHIBITS EXHIBIT NUMBER 1. Amendment No. 3 to Rights Agreement dated as of July 22, 1999, between Administaff, Inc. and Harris Trust and Savings Bank, as Rights Agent. 2. Amendment No. 4 to Rights Agreement, dated as of August 2, 1999, between Administaff, Inc. and Harris Trust and Savings Bank, as Rights Agent.