Rodney M. Smith - 13 Jan 2022 Form 4 Insider Report for AMERICAN TOWER CORP /MA/ (AMT)

Role: EVP, CFO & Treasurer
Signature: /s/ Mneesha O. Nahata, as attorney-in-fact
Issuer symbol: AMT
Transactions as of: 13 Jan 2022
Net transactions value: -$747,407
Form type: 4
Filing time: 18 Jan 2022, 15:11:34 UTC
Previous filing: 14 Feb 2022
Next filing: 14 Mar 2022
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	AMT	Common Stock	Options Exercise	$281,153	+3,956	+8.2%	$71.07	52,404	13 Jan 2022	Direct	F1
transaction	AMT	Common Stock	Sale	$1,028,560	-3,956	-7.5%	$260.00	48,448	13 Jan 2022	Direct	F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	AMT	Option to Purchase Common Stock	Options Exercise	$0	-3,956	-100%	$0.000000^*	0	13 Jan 2022	Common Stock	3,956	$71.07	Direct	F3

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Includes 106 shares acquired under the issuer's employee stock purchase plan in May 2021.
F2	The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 14, 2021.
F3	This option was granted pursuant to the 2007 Equity Incentive Plan, as amended, and is exercisable in 25% cumulative annual increments beginning October 1, 2013.