X0202 4 2004-09-02 0001053507 AMERICAN TOWER CORP /MA/ AMT 0001060571 GEARON J MICHAEL JR 116 HUNTINGTON AVE BOSTON MA 02116 0 1 0 0 Pres., American Tower Int'l Class A Common Stock 2004-09-02 4 S 0 19500 14.99 D 2597499 D Class A Common Stock 2004-09-02 4 S 0 99200 15.00 D 2498299 D Class A Common Stock 2004-09-02 4 S 0 10700 15.01 D 2487599 D Class A Common Stock 2004-09-02 4 S 0 4700 15.03 D 2482899 D Class A Common Stock 2004-09-02 4 S 0 5300 15.04 D 2477599 D Class A Common Stock 2004-09-02 4 S 0 10600 15.05 D 2466999 D Class A Common Stock 2004-09-03 4 S 0 1100 14.95 D 2465899 D Class A Common Stock 2004-09-03 4 S 0 200 14.96 D 2465699 D Class A Common Stock 2004-09-03 4 S 0 8600 14.97 D 2457099 D Class A Common Stock 2004-09-03 4 S 0 1200 14.98 D 2455899 D Class A Common Stock 2004-09-07 4 S 0 19900 14.90 D 2435999 D Class A Common Stock 2004-09-07 4 S 0 5100 14.91 D 2430899 D Class A Common Stock 2004-09-07 4 S 0 5000 14.92 D 2425899 D Class A Common Stock 2004-09-07 4 S 0 5000 14.93 D 2420899 D Class A Common Stock 2004-09-07 4 S 0 2500 14.97 D 2418399 D Class A Common Stock 2004-09-07 4 S 0 9800 14.98 D 2408599 D Class A Common Stock 2004-09-07 4 S 0 5400 14.99 D 2403199 D Class A Common Stock 2004-09-07 4 S 0 30500 15.00 D 2372699 D Class A Common Stock 2004-09-07 4 S 0 10100 15.01 D 2362599 D Class A Common Stock 2004-09-07 4 S 0 500 15.02 D 2362099 D Class A Common Stock 2004-09-07 4 S 0 8000 15.03 D 2354099 D Class A Common Stock 2004-09-07 4 S 0 23200 15.05 D 2330899 D Class A Common Stock 2004-09-07 4 S 0 9700 15.07 D 2321199 D Class A Common Stock 2004-09-07 4 S 0 26100 15.08 D 2295099 D Class A Common Stock 2004-09-07 4 S 0 10200 15.09 D 2284899 D Class A Common Stock 2004-09-07 4 S 0 25100 15.10 D 2259799 D Class A Common Stock 452 I By Partnership Prior to September 2, 2004, Mr. Gearon's direct holdings consisted of 2,616,999 shares of Class A Common Stock. Previously, some of these shares had been reported as being held by an affiliated partnership, JMG Partners L.P. JMG Partners L.P. does not hold any shares of Class A Common Stock. Shares of Class A Common Stock held by Gearon Sibling/Nibling Partners, L.P. J. Michael Gearon, Jr. 2004-09-07