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American Tower Corporation (AMT) SEC Filing (8-K) 2003

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

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Last updated: March 17, 2026, 5:32 AM ET

SEC Filings

Date

2003

8-K

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

Dec 18, 2003 05:22 PM

2026

4

Insider ownership (buying, selling) activity

Jul 31, 2026 04:08 PM

4

Insider ownership (buying, selling) activity

Jul 30, 2026 04:11 PM

8-K

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

Jul 28, 2026 07:05 AM

10-Q

Quarterly financial results and management updates

Jul 28, 2026 04:07 PM

CERT

Certification of exchange listing or compliance

Jun 8, 2026 09:08 AM

8-K

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

Jun 4, 2026 04:39 PM

8-K

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

Jun 2, 2026 04:18 PM

4

Insider ownership (buying, selling) activity

Jun 1, 2026 04:28 PM

8-K

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

May 27, 2026 08:00 AM

8-A12B

Registration of securities for listing on a national exchange

May 27, 2026 08:13 AM

S-8

Registration of shares for employee stock plans

May 26, 2026 04:29 PM

25-NSE

Exchange-filed notice of delisting

May 22, 2026 09:44 AM

8-K

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

May 21, 2026 04:17 PM

424B2

Prospectus variant for specific offering structures

May 20, 2026 04:11 PM

4

Insider ownership (buying, selling) activity

May 20, 2026 04:09 PM

FWP

Free writing prospectus related to a securities offering

May 19, 2026 04:10 PM

424B5

Shelf offering prospectus with final pricing terms

May 19, 2026 06:02 AM

8-K

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

May 19, 2026 04:14 PM

8-K

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

May 7, 2026 04:38 PM

3

Initial disclosure of insider ownership

Apr 30, 2026 04:12 PM

4

Insider ownership (buying, selling) activity

Apr 30, 2026 04:16 PM

SC 13G

Passive large shareholder ownership disclosure

Apr 29, 2026 04:41 PM

8-K

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

Apr 28, 2026 07:04 AM

SC 13G

Passive large shareholder ownership disclosure

Apr 28, 2026 04:06 PM

10-Q

Quarterly financial results and management updates

Apr 28, 2026 04:11 PM

DEFA14A

Additional or supplemental proxy disclosures

Apr 28, 2026 04:13 PM

DEF 14A

Final shareholder voting details (board elections and executive pay)

Apr 8, 2026 08:32 AM

DEFA14A

Additional or supplemental proxy disclosures

Apr 8, 2026 08:35 AM

ARS

Annual Report to Shareholders

Apr 8, 2026 08:50 AM

SC 13G/A

Updated passive ownership disclosure

Mar 26, 2026 03:44 PM

4

Insider ownership (buying, selling) activity

Mar 12, 2026 04:34 PM

4

Insider ownership (buying, selling) activity

Mar 12, 2026 04:34 PM

4

Insider ownership (buying, selling) activity

Mar 12, 2026 04:38 PM

4

Insider ownership (buying, selling) activity

Mar 12, 2026 04:35 PM

4

Insider ownership (buying, selling) activity

Mar 12, 2026 04:37 PM

4

Insider ownership (buying, selling) activity

Mar 12, 2026 04:38 PM

4

Insider ownership (buying, selling) activity

Mar 12, 2026 04:44 PM

4

Insider ownership (buying, selling) activity

Mar 12, 2026 04:43 PM

4

Insider ownership (buying, selling) activity

Mar 12, 2026 04:42 PM

4

Insider ownership (buying, selling) activity

Mar 12, 2026 04:41 PM

American Tower Corporation (Form 8-K) 2003

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

Dec 18, 2003 05:22 PM

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