Screener / SEC EDGAR /CIK 0001053507 /10-K filed Feb 24, 2026, compared with Feb 25, 2025 /Numbers from the XBRL of the 10-Ks

NYSE Real estate · REIT

American Tower AMT

New risk paragraphs 21 Not in last year's 10-K Accounting checks 1 worth reading about, of 10 checks Insider buys 2 open-market, last 90 days Filings 7 in the last 30 days

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Filings with the SEC since May 2, 2017

1,006 filings, 12 in the last 30 days

SEC filing index

Latest annual report Feb 24, 2026 10-K, period to Dec 31, 2025 Latest quarterly report Oct 27, 2026 10-Q, period to Sep 30, 2026 Latest current report Nov 13, 2026 8-K: Material agreement signed, New debt or obligation

Filed in the last 30 days 12 of 1,006 in all

What the 8-Ks said

2 events in the last 3 years: the officer, auditor, restatement, cyber, restructuring, listing, impairment and debt items. One line each, the filing's own words.

CEO, CFO, COO or CAO: 2 (item 5.02)Auditor change: 0 (item 4.01)Not to be relied on: 0 (item 4.02)Cybersecurity: 0 (item 1.05)Restructuring: 0 (item 2.05)Listing notice: 0 (item 3.01)Impairment: 0 (item 2.06)Debt trigger: 0 (item 2.04)

Jan 29, 2026 CEO, CFO, COO or CAOCAO change “(c) On January 26, 2026, American Tower Corporation (the “Company”) appointed Paul Blanchett as its Senior Vice President and Chief Accounting Officer (Principal Accounting Officer), effective April 27, 2026 (the “Start Date”).” 8-K item 5.02 · all documents
Nov 7, 2025 CEO, CFO, COO or CAOCAO change “Meyer communicated his intention to retire from his role as Senior Vice President and Chief Accounting Officer of American Tower Corporation (the “Company”).” 8-K item 5.02 · all documents

From the SEC filing index and the text of each 8-K. A line appears only when the 8-K names one of these items; for item 5.02 only a move of the CEO, CFO, COO or chief accounting officer. Older 8-Ks may have no text downloaded, so they show no quote.

Late filings, 8-K notices and going concern

None found in the last 2 years

All checks

Late filing notices (NT 10-K, NT 10-Q)

No notice in the last 2 years.
8-K notices: listing, impairment, debt trigger

No item 3.01, 2.06 or 2.04 in the last 2 years.
Going-concern language in the 10-K

No statement of substantial doubt in the latest 10-K.

Source: 10-K 0001053507-26-000035 (filed Feb 24, 2026): full text searched

Facts to read in the filing, not a verdict: many companies with one of these carry on normally, and a company with neither can still have problems.

Every filing on one line

Each mark is a filing or an event in one; the bigger square is a 10-K. Hover for what it is, click to open it.

Annual report (10-K)Quarterly report (10-Q)Current report (8-K)Auditor changeCEO, CFO, COO or CAO changeRestatementLate filing noticeInsider purchaseCluster buy (3+ insiders)SEC comment letterShare offering (S-3, 424B)Planned insider sale (Form 144, 10b5-1)

2026

All 40 events

Nov 13, 2026 8-K Material agreement signed, New debt or obligation8-K items 1.01, 2.03
Nov 9, 2026 8-K Other events8-K item 8.01
Oct 30, 2026 Planned sale JUAN FONT HERNANDEZ (Officer) gave notice of a planned sale of 592 shares worth about $112KForm 144, approximate sale date Oct 30, 2026
Oct 28, 2026 Planned sale RUTH T DOWLING (Officer) gave notice of a planned sale of 1,578 shares worth about $290KForm 144, approximate sale date Oct 28, 2026, under a 10b5-1 plan adopted Oct 29, 2025
Oct 27, 2026 8-K Quarterly results8-K item 2.02
Oct 27, 2026 10-Q Quarterly report (10-Q)period ended Sep 30, 2026
Oct 22, 2026 Buy Clarke Teresa Hillary (Director) bought $64Kopen-market purchase on Apr 28, 2023, reported 3 years late
Sep 18, 2026 8-K Director or officer change, Other events8-K items 5.02, 8.01
Sep 14, 2026 8-K Material agreement signed, New debt or obligation8-K items 1.01, 2.03
Sep 9, 2026 8-K Other events8-K item 8.01
Aug 25, 2026 Buy Kalathur Rajesh (Director) bought $501Kopen-market purchase on Aug 21, 2026
Jul 29, 2026 Planned sale ROBERT MEYER (Officer) gave notice of a planned sale of 5,000 shares worth about $894KForm 144, approximate sale date Jul 29, 2026
Jul 28, 2026 Planned sale RUTH T DOWLING (Officer) gave notice of a planned sale of 1,791 shares worth about $299KForm 144, approximate sale date Jul 28, 2026, under a 10b5-1 plan adopted Oct 29, 2025
Jul 28, 2026 8-K Quarterly results8-K item 2.02
Jul 28, 2026 10-Q Quarterly report (10-Q)period ended Jun 30, 2026
Jun 4, 2026 8-K Other events8-K item 8.01
Jun 2, 2026 8-K Other events8-K item 8.01
May 27, 2026 8-K Material agreement signed, New debt or obligation8-K items 1.01, 2.03
May 21, 2026 8-K Director or officer change, Shareholder vote results, Other events8-K items 5.02, 5.07, 8.01
May 19, 2026 8-K Other events8-K item 8.01
May 7, 2026 8-K Material agreement signed, New debt or obligation8-K items 1.01, 2.03
Apr 28, 2026 8-K Quarterly results8-K item 2.02
Apr 28, 2026 10-Q Quarterly report (10-Q)period ended Mar 31, 2026
Mar 10, 2026 8-K Director or officer change8-K item 5.02
Mar 5, 2026 8-K Other events8-K item 8.01
Mar 4, 2026 Planned sale STEVEN O VONDRAN (Officer, Director) gave notice of a planned sale of 33,482 shares worth about $6.3MForm 144, approximate sale date Mar 4, 2026, under a 10b5-1 plan adopted May 6, 2025
Mar 2, 2026 Planned sale EUGENE NOEL (Officer) gave notice of a planned sale of 41,209 shares worth about $7.9MForm 144, approximate sale date Mar 2, 2026, under a 10b5-1 plan adopted Feb 26, 2025
Feb 27, 2026 Planned sale ROBERT MEYER (Officer) gave notice of a planned sale of 4,454 shares worth about $832KForm 144, approximate sale date Feb 27, 2026
Feb 27, 2026 Planned sale RUTH T DOWLING (Officer) gave notice of a planned sale of 2,310 shares worth about $427KForm 144, approximate sale date Feb 27, 2026, under a 10b5-1 plan adopted Oct 29, 2025
Feb 27, 2026 8-K Director or officer change8-K item 5.02
Feb 25, 2026 Planned sale Olivier Puech Trust (EVP Latin America) gave notice of a planned sale of 17,665 shares worth about $3.2MForm 144, approximate sale date Feb 25, 2026
Feb 24, 2026 Planned sale Ruth T. Dowling (Executive Vice President, Chief Administrative Officer, General Counsel and Secretary) adopted a 10b5-1 trading planreported in the 10-K, up to 5,679 shares, runs to Nov 2, 2026
Feb 24, 2026 8-K Quarterly results8-K item 2.02
Feb 24, 2026 10-K Annual report (10-K)period ended Dec 31, 2025
Feb 17, 2026 Planned sale RODNEY SMITH (Officer) gave notice of a planned sale of 34,341 shares worth about $6.6MForm 144, approximate sale date Feb 17, 2026, under a 10b5-1 plan adopted May 22, 2025
Jan 29, 2026 Officer CAO change(c) On January 26, 2026, American Tower Corporation (the “Company”) appointed Paul Blanchett as its Senior Vice President and Chief Accounting Officer (Principal Accounting Officer), effective April 27, 2026 (the “Start Date”).
Jan 28, 2026 8-K Other events8-K item 8.01
Dec 5, 2025 8-K Material agreement signed, New debt or obligation8-K items 1.01, 2.03
Dec 4, 2025 8-K Other events8-K item 8.01
Dec 2, 2025 8-K Other events8-K item 8.01

From the SEC filing index. Insider purchases go back 180 days (the Form 4s downloaded).

Every filing

Newest first, by kind · each form links to sec.gov

Filed	Form	What it is	Period
Nov 13, 2026	8-K	Material agreement signed, New debt or obligation	Nov 13, 2026	all files
Nov 10, 2026	424B2	Prospectus (notes)		all files
Nov 9, 2026	FWP	Offering terms		all files
Nov 9, 2026	424B5	Prospectus		all files
Nov 9, 2026	8-K	Other events	Nov 9, 2026	all files
Nov 3, 2026	4	Insider trade	Oct 30, 2026	all files
Oct 30, 2026	144	Notice of planned insider sale		all files
Oct 30, 2026	4	Insider trade	Oct 28, 2026	all files
Oct 28, 2026	144	Notice of planned insider sale		all files
Oct 27, 2026	10-Q	Quarterly report	Sep 30, 2026	all files · tables
Oct 27, 2026	8-K	Quarterly results	Oct 27, 2026	all files
Oct 22, 2026	4	Insider trade	Apr 28, 2023	all files
Oct 5, 2026	4	Insider trade	Oct 1, 2026	all files
Sep 23, 2026	3	New insider	Sep 17, 2026	all files
Sep 18, 2026	8-K	Director or officer change, Other events	Sep 17, 2026	all files
Sep 14, 2026	8-K	Material agreement signed, New debt or obligation	Sep 14, 2026	all files
Sep 10, 2026	424B2	Prospectus (notes)		all files
Sep 9, 2026	FWP	Offering terms		all files
Sep 9, 2026	424B5	Prospectus		all files
Sep 9, 2026	8-K	Other events	Sep 9, 2026	all files
Aug 25, 2026	4	Insider trade	Aug 21, 2026	all files
Jul 31, 2026	4	Insider trade	Jul 29, 2026	all files
Jul 30, 2026	4	Insider trade	Jul 28, 2026	all files
Jul 29, 2026	144	Notice of planned insider sale		all files
Jul 28, 2026	144	Notice of planned insider sale		all files
Jul 28, 2026	10-Q	Quarterly report	Jun 30, 2026	all files · tables
Jul 28, 2026	8-K	Quarterly results	Jul 28, 2026	all files
Jun 8, 2026	CERT			all files
Jun 4, 2026	8-K	Other events	Jun 2, 2026	all files
Jun 3, 2026	4	Insider trade	Jun 1, 2026	all files
Jun 2, 2026	8-K	Other events	Jun 2, 2026	all files
Jun 1, 2026	4	Insider trade	May 28, 2026	all files
May 27, 2026	8-K	Material agreement signed, New debt or obligation	May 27, 2026	all files
May 27, 2026	8-A12B			all files
May 26, 2026	S-8	Shares registered for employee plans		all files
May 22, 2026	25-NSE			all files
May 21, 2026	8-K	Director or officer change, Shareholder vote results, Other events	May 20, 2026	all files
May 20, 2026	424B2	Prospectus (notes)		all files
May 20, 2026	4	Insider trade	May 20, 2026	all files
May 19, 2026	FWP	Offering terms		all files
May 19, 2026	424B5	Prospectus		all files
May 19, 2026	8-K	Other events	May 19, 2026	all files
May 7, 2026	8-K	Material agreement signed, New debt or obligation	May 7, 2026	all files
Apr 30, 2026	4	Insider trade	Apr 28, 2026	all files
Apr 30, 2026	3	New insider	Apr 27, 2026	all files
Apr 29, 2026	SCHEDULE 13G	5%+ owner (passive)		all files
Apr 28, 2026	SCHEDULE 13G	5%+ owner (passive)		all files
Apr 28, 2026	DEFA14A	Extra proxy material		all files
Apr 28, 2026	10-Q	Quarterly report	Mar 31, 2026	all files · tables
Apr 28, 2026	8-K	Quarterly results	Apr 28, 2026	all files
Apr 8, 2026	ARS	Annual report to shareholders	Dec 31, 2025	all files
Apr 8, 2026	DEFA14A	Extra proxy material		all files
Apr 8, 2026	DEF 14A	Proxy statement	May 20, 2026	all files
Mar 26, 2026	SCHEDULE 13G/A	5%+ owner (passive), amended		all files
Mar 12, 2026	4	Insider trade	Mar 10, 2026	all files
Mar 12, 2026	4	Insider trade	Mar 10, 2026	all files
Mar 12, 2026	4	Insider trade	Mar 10, 2026	all files
Mar 12, 2026	4	Insider trade	Mar 10, 2026	all files
Mar 12, 2026	4	Insider trade	Mar 10, 2026	all files
Mar 12, 2026	4	Insider trade	Mar 10, 2026	all files
Mar 12, 2026	4	Insider trade	Mar 10, 2026	all files
Mar 12, 2026	4	Insider trade	Mar 10, 2026	all files
Mar 12, 2026	4	Insider trade	Mar 10, 2026	all files
Mar 12, 2026	4	Insider trade	Mar 10, 2026	all files
Mar 12, 2026	4	Insider trade	Mar 10, 2026	all files
Mar 12, 2026	4	Insider trade	Mar 10, 2026	all files
Mar 12, 2026	4	Insider trade	Mar 10, 2026	all files
Mar 12, 2026	4	Insider trade	Mar 10, 2026	all files
Mar 12, 2026	4	Insider trade	Mar 10, 2026	all files
Mar 12, 2026	4	Insider trade	Mar 10, 2026	all files
Mar 12, 2026	4	Insider trade	Mar 10, 2026	all files
Mar 12, 2026	4	Insider trade	Mar 10, 2026	all files
Mar 10, 2026	8-K	Director or officer change	Mar 6, 2026	all files
Mar 6, 2026	4	Insider trade	Mar 4, 2026	all files
Mar 6, 2026	4	Insider trade	Mar 4, 2026	all files
Mar 5, 2026	8-K	Other events	Mar 5, 2026	all files
Mar 4, 2026	4	Insider trade	Mar 2, 2026	all files
Mar 4, 2026	144	Notice of planned insider sale		all files
Mar 3, 2026	4	Insider trade	Feb 27, 2026	all files
Mar 3, 2026	4	Insider trade	Feb 27, 2026	all files
Mar 2, 2026	144	Notice of planned insider sale		all files
Feb 27, 2026	4	Insider trade	Feb 25, 2026	all files
Feb 27, 2026	144	Notice of planned insider sale		all files
Feb 27, 2026	144	Notice of planned insider sale		all files
Feb 27, 2026	4	Insider trade	Feb 25, 2026	all files
Feb 27, 2026	4	Insider trade	Feb 25, 2026	all files
Feb 27, 2026	8-K	Director or officer change	Feb 25, 2026	all files
Feb 25, 2026	144	Notice of planned insider sale		all files
Feb 24, 2026	10-K	Annual report	Dec 31, 2025	all files · tables
Feb 24, 2026	8-K	Quarterly results	Feb 24, 2026	all files
Feb 19, 2026	4	Insider trade	Feb 17, 2026	all files
Feb 17, 2026	144	Notice of planned insider sale		all files
Jan 29, 2026	8-K	Director or officer change	Jan 26, 2026	all files
Jan 28, 2026	8-K	Other events	Jan 28, 2026	all files
Jan 6, 2026	4	Insider trade	Jan 2, 2026	all files
Jan 6, 2026	4	Insider trade	Jan 3, 2026	all files
Dec 5, 2025	8-K	Material agreement signed, New debt or obligation	Dec 5, 2025	all files
Dec 4, 2025	8-K	Other events	Dec 4, 2025	all files
Dec 3, 2025	424B2	Prospectus (notes)		all files
Dec 2, 2025	FWP	Offering terms		all files

Show the other 75 filings on this page

Press releases with quarterly results are attached to the 8-Ks marked "Quarterly results"; read them on Earnings releases.

Sources

SEC's filing index (data.sec.gov submissions). Each form links to the document on sec.gov.

Also

Earnings releases: the text of each quarter's results release. Statements by period: the income statement, balance sheet or cash flow of the last filings side by side.

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