Initial Statement of Beneficial Ownership (3)

FORM 3	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES	OMB APPROVAL OMB Number: 3235-0104 Estimated average burden hours per response... 0.5
	Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

1. Name and Address of Reporting Person * Smith Rodney M	2. Date of Event Requiring Statement (MM/DD/YYYY) 3/16/2020	3. Issuer Name and Ticker or Trading Symbol AMERICAN TOWER CORP /MA/ [AMT]
(Last)        (First)        (Middle) 116 HUNTINGTON AVENUE	4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director                          _____ 10% Owner ___X___ Officer (give title below)        _____ Other (specify below) EVP, CFO & Treasurer /
(Street) BOSTON, MA 02116       (City)              (State)              (Zip)	5. If Amendment, Date Original Filed(MM/DD/YYYY)	6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	41611 (1)	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security (Instr. 4)	2. Date Exercisable and Expiration Date (MM/DD/YYYY)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Option to Purchase Common Stock	(2)	3/12/2022	Common Stock	17232	$62.00	D
Option to Purchase Common Stock	(3)	10/1/2022	Common Stock	3956	$71.07	D
Option to Purchase Common Stock	(4)	3/11/2023	Common Stock	25389	$76.90	D
Option to Purchase Common Stock	(5)	3/10/2024	Common Stock	33019	$81.18	D
Option to Purchase Common Stock	(6)	3/10/2025	Common Stock	33135	$94.57	D
Option to Purchase Common Stock	(7)	3/10/2026	Common Stock	34341	$94.71	D

Explanation of Responses:
(1)	Amount includes 13,798 shares of Common Stock underlying unvested restricted stock units previously granted under the 2007 Equity Incentive Plan, as amended (the "Plan").
(2)	This option was granted pursuant to the Plan and is exercisable in 25% cumulative annual increments beginning March 12, 2013.
(3)	This option was granted pursuant to the Plan and is exercisable in 25% cumulative annual increments beginning October 1, 2013.
(4)	This option was granted pursuant to the Plan and is exercisable in 25% cumulative annual increments beginning March 11, 2014.
(5)	This option was granted pursuant to the Plan and is exercisable in 25% cumulative annual increments beginning March 10, 2015.
(6)	This option was granted pursuant to the Plan and is exercisable in 25% cumulative annual increments beginning March 10, 2016.
(7)	This option was granted pursuant to the Plan and is exercisable in 25% cumulative annual increments beginning March 10, 2017.

Reporting Owners
Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Smith Rodney M 116 HUNTINGTON AVENUE BOSTON, MA 02116			EVP, CFO & Treasurer

Signatures
/s/ Mneesha O. Nahata, as attorney-in-fact		3/26/2020
**Signature of Reporting Person		Date