American Tower Corporation (AMT) SEC Filings

Browse all American Tower Corporation SEC filings, including Annual reports (10-K), Quarterly reports (10-Q), 8-K, proxy statements (DEF 14A), and insider filings (Form 4). Access official documents by filing date, reporting period, and form type. ...more

American Tower Corporation Reports: Annual 10-K, Quarterly 10-Q & SEC Filings

SEC Filings

Date

8-K

Material company events (earnings, M&A, or leadership changes)

May 27, 2026

8-A12B

Registration of securities for listing on a national exchange

May 27, 2026

S-8

Registration of shares for employee stock plans

May 26, 2026

25-NSE

Exchange-filed notice of delisting

May 22, 2026

8-K

Material company events (earnings, M&A, or leadership changes)

May 21, 2026

4

Insider ownership (buying, selling) activity

May 20, 2026

424B2

Prospectus variant for specific offering structures

May 20, 2026

8-K

Material company events (earnings, M&A, or leadership changes)

May 19, 2026

424B5

Shelf offering prospectus with final pricing terms

May 19, 2026

FWP

Free writing prospectus related to a securities offering

May 19, 2026

8-K

Material company events (earnings, M&A, or leadership changes)

May 7, 2026

4

Insider ownership (buying, selling) activity

Apr 30, 2026

3

Initial disclosure of insider ownership

Apr 30, 2026

SC 13G

Passive large shareholder ownership disclosure

Apr 29, 2026

8-K

Material company events (earnings, M&A, or leadership changes)

Apr 28, 2026

SC 13G

Passive large shareholder ownership disclosure

Apr 28, 2026

10-Q

Quarterly financial results and management updates

Apr 28, 2026

DEFA14A

Additional or supplemental proxy disclosures

Apr 28, 2026

DEF 14A

Final shareholder voting details (board elections and executive pay)

Apr 8, 2026

DEFA14A

Additional or supplemental proxy disclosures

Apr 8, 2026

ARS

Annual Report to Shareholders

Apr 8, 2026

SC 13G/A

Updated passive ownership disclosure

Mar 26, 2026

4

Insider ownership (buying, selling) activity

Mar 12, 2026

4

Insider ownership (buying, selling) activity

Mar 12, 2026

4

Insider ownership (buying, selling) activity

Mar 12, 2026

4

Insider ownership (buying, selling) activity

Mar 12, 2026

4

Insider ownership (buying, selling) activity

Mar 12, 2026

4

Insider ownership (buying, selling) activity

Mar 12, 2026

4

Insider ownership (buying, selling) activity

Mar 12, 2026

4

Insider ownership (buying, selling) activity

Mar 12, 2026

4

Insider ownership (buying, selling) activity

Mar 12, 2026

4

Insider ownership (buying, selling) activity

Mar 12, 2026

4

Insider ownership (buying, selling) activity

Mar 12, 2026

4

Insider ownership (buying, selling) activity

Mar 12, 2026

4

Insider ownership (buying, selling) activity

Mar 12, 2026

4

Insider ownership (buying, selling) activity

Mar 12, 2026

4

Insider ownership (buying, selling) activity

Mar 12, 2026

4

Insider ownership (buying, selling) activity

Mar 12, 2026

4

Insider ownership (buying, selling) activity

Mar 12, 2026

4

Insider ownership (buying, selling) activity

Mar 12, 2026

American Tower Corporation (Form 8-K) 2026

Current Events / Material company events (earnings, M&A, or leadership changes)

May 27, 2026

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