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 AMERICAN TOWER SYSTEMS CORPORATION (Exact name of registrant as specified in its charter) Delaware 65-0598206 (State of incorporation or organization) (I.R.S. Employer Identification No.) 116 Huntington Avenue, Boston, Massachusetts 02116 (Address of principal Executive offices) (Zip Code) If this form relates to the If this form relates to the registration of a class of securities registration of a class of securities pursuant to Section 12(b) of the pursuant to Section 12(g) of the Exchange Act and is effective Exchange Act and is effective pursuant to General Instruction pursuant to General Instruction A.(c), please check the following A.(d), please check the following box. /X/ box. / / Securities Act registration statement file number to which this form relates: 333-46025 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 Class A Common Stock, New York Stock Exchange $.01 par value 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 Those portions of Registrant registration statement on Form S-4, File No. 333-46025, as declared effective by the Securities and Exchange Commission on February 17, 1998 (the "Registration Statement"), set forth under the caption "Description of American Tower Systems Capital Stock" are incorporated herein by reference. Item 2. Exhibits 1. All exhibits required by Instructions to Item 2 have been supplied to the New York Stock Exchange. SIGNATURES 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, thereunto duly authorized. AMERICAN TOWER SYSTEMS CORPORATION (Registrant) By: /s/ Justin D. Benincasa Name: Justin D. Benincasa Title: Vice President and Corporate Controller Dated: June 4, 1998