Dowling Ruth T. - 10 Mar 2026 Form 4 Insider Report for AMERICAN TOWER CORP /MA/ (AMT)

Role
EVP, Chief Admin Ofr, GC & Sec
Signature
/s/ Marina A. Breed, as attorney-in-fact
Issuer symbol
AMT
Transactions as of
10 Mar 2026
Net transactions value
$0
Form type
4
Filing time
12 Mar 2026, 16:40:51 UTC
Previous filing
06 Mar 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Dowling Ruth T EVP, Chief Admin Ofr, GC & Sec 222 BERKELEY STREET, BOSTON /s/ Marina A. Breed, as attorney-in-fact 12 Mar 2026 0001960785

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction AMT Common Stock Award +6,878 +22% $0.000000* 37,925 10 Mar 2026 Direct F1
transaction AMT Common Stock Tax liability -6,629 -17% $186.12* 31,296 10 Mar 2026 Direct F2
transaction AMT Common Stock Tax liability -863 -2.8% $182.85* 30,433 11 Mar 2026 Direct F3
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 These restricted stock units ("RSUs") were granted pursuant to the 2007 Equity Incentive Plan, as amended (the "Plan"), and vest 1/3rd annually over three years, commencing one year from the date of grant. Each RSU represents a contingent right to receive one share of Common Stock.
F2 Shares delivered to the issuer for the payment of withholding taxes in connection with the vesting of RSUs and performance-based restricted stock units previously granted under the Plan.
F3 Shares delivered to the issuer for the payment of withholding taxes in connection with the vesting of RSUs previously granted under the Plan.