What SEC filings does American Tower Corporation submit to the SEC?

American Tower Corporation (AMT) submits several types of SEC filings including Form 4 (insider transactions), Form 144 (proposed insider sales), 8-K reports (material events such as earnings releases, acquisitions, leadership changes), and periodic reports — the 10-Q (quarterly) and 10-K (annual). All filings are publicly available through SEC EDGAR.

What does a Form 4 filing tell me about AMT?

A Form 4 for AMT discloses a transaction by a company insider — typically a director, officer, or 10%+ shareholder. It shows the source-reported date, number of shares, price, and updated ownership. These facts do not establish motive or predict future returns.

How do I interpret an 8-K filing from American Tower Corporation?

An 8-K signals a material event requiring prompt disclosure. Common triggers include earnings pre-announcements, acquisitions, leadership appointments or departures, credit changes, or regulatory actions. Read the item codes inside the filing to understand exactly what was disclosed before drawing conclusions.

What is the difference between a 10-K and 10-Q for AMT?

The 10-K is American Tower Corporation's annual report with fully audited financial statements, comprehensive MD&A, and complete risk factor disclosures — filed 60–90 days after fiscal year-end. The 10-Q is a lighter quarterly report with unaudited financials filed for the first three quarters. Together they provide a continuous financial picture of the company.

Where can I see all AMT SEC filings directly on EDGAR?

You can view all historical American Tower Corporation filings on the SEC EDGAR company page for AMT. Each filing card on this page links directly to the original SEC document.

How often does American Tower Corporation file with the SEC?

American Tower Corporation files one 10-K per year and up to three 10-Qs per year. Form 4 insider transactions must be reported within two business days of each trade, so the frequency depends on how often insiders are buying or selling AMT shares. 8-K filings occur whenever a material event happens — which can be several times per quarter for an active company.

AMT SEC Filing News — American Tower Corporation

Latest SEC filings for American Tower Corporation (AMT) explained in plain English. Covers insider buying and selling (Form 4), proposed insider sales (Form 144), material company events (8-K), and quarterly & annual reports (10-Q / 10-K). StrongBuyAnalytics provides navigation and brief excerpts or summaries; original filings remain at the SEC/source links and were authored by their filers, not StrongBuyAnalytics. Filing dates shown are source dates. Coverage and detection can be delayed or incomplete because of SEC availability, amendments, parsing, caching, or outages. Latest source filing date shown: 2026-10-05.

American Tower Corporation one of the largest global REITs, is a leading independent owner, operator and developer of multitenant communications real estate with a portfolio of over 148,000 communications sites and a highly interconnected footprint of U.S. data center facilities. American Tower Corporation was incorporated in 1995 in Delaware and is based in Massachusetts, Boston.

Sector: Real Estate Industry: REIT - Specialty Market Cap: $85.1B

Total Filings

Bullish Classifications

Bearish Classifications

Insider Transactions

Material Events (8-K)

Periodic Reports

Rule-based classifications for AMT currently lean bearish. Of the 20 filing records displayed, 2 carry bearish classifications (such as insider sales or negative 8-K disclosures) versus 1 bullish. This does not necessarily signal fundamental deterioration — insiders sell for many reasons — but it is worth monitoring alongside the company's core financial metrics.

AMT Filing Activity Snapshot 2026-05-07 — 2026-10-05

Insider Transactions (Form 4)

1 buy vs 2 sells

Net insider selling in this period — insiders sell for many reasons beyond conviction.

Largest Form 144 Filing

$894.4K

Meyer Robert Joseph (SVP & Advisor to the CFO) · 2026-07-31

5,000 shares · Form 4

Form 144 Notices

Proposed insider sales filed — Form 144 is a notice of intent, not a confirmed transaction. Actual sales are confirmed via Form 4.

Insider Transactions 7 · Forms 3, 4 and 5

A Form 4 is filed within two business days of a company insider — an officer, a director, or a holder of more than ten percent of the stock — changing their position in the shares. All 7 filings in this group are Form 4s for American Tower Corporation.

The difficulty with reading these filings as a group is that a single form type covers transactions that mean entirely different things. An executive spending their own money to buy stock and an executive having shares withheld to pay tax on a vesting grant both appear as a Form 4. Every filing below is therefore tagged with the nature of the underlying transaction, taken from the transaction code reported on the form itself.

Across the 7 insider filings shown, the breakdown is 2 open-market sale, 1 compensation award, 1 gift, 1 open-market purchase and 1 tax withholding. The remaining 1 filing reports no transaction line — a holdings statement, or a form whose transaction table could not be read — so it is left unclassified rather than guessed at. 3 of them involved a discretionary open-market trade; the rest are compensation and administrative mechanics.

What each transaction type means

Open-market sale ×2: The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.
Compensation award ×1: Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.
Gift ×1: Shares were transferred as a gift, typically for estate or charitable planning. No sale into the market took place.
Open-market purchase ×1: The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.
Tax withholding ×1: Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Form 4 Compensation award Tax / Compensation Filing 2026-10-05

AMT insider Form 4 filed for equity award, exercise, or tax withholding

Blanchett Paul (SVP & Chief Accounting Officer) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award	16,299	—	—

Filing: Form 4 (Insider Transaction) Insider: Blanchett Paul (SVP & Chief Accounting Officer) Shares: 16,299

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market purchase Insider Buying 2026-08-25

AMT insider Kalathur Rajesh (Director) bought 2,829 shares (~$500.7K)

Kalathur Rajesh, listed as Director at AMERICAN TOWER CORP /MA/, reported an open-market purchase of 2,829 AMT shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.

The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`P`	Open-market purchase	2,829	$177.00	$500.7K

Filing: Form 4 (Insider Transaction) Insider: Kalathur Rajesh (Director) Shares: 2,829 Est. Value: $500.7K

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market sale Insider Selling 2026-07-31

AMT insider Meyer Robert Joseph (SVP & Advisor to the CFO) sold 5,000 shares (~$894.4K)

Meyer Robert Joseph, listed as SVP & Advisor to the CFO at AMERICAN TOWER CORP /MA/, reported an open-market sale of 5,000 AMT shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`S`	Open-market sale	5,000	$178.89	$894.4K

Filing: Form 4 (Insider Transaction) Insider: Meyer Robert Joseph (SVP & Advisor to the CFO) Shares: 5,000 Est. Value: $894.4K

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market sale Insider Selling 2026-07-30

AMT insider Dowling Ruth T (EVP, Chief Admin Ofr, GC & Sec) sold 1,791 shares (~$309.6K)

Dowling Ruth T, listed as EVP, Chief Admin Ofr, GC & Sec at AMERICAN TOWER CORP /MA/, reported an open-market sale of 1,791 AMT shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`S`	Open-market sale	685	$169.54	$116.1K
`S`	Open-market sale	1,106	$174.96	$193.5K

Filing: Form 4 (Insider Transaction) Insider: Dowling Ruth T (EVP, Chief Admin Ofr, GC & Sec) Shares: 1,791 Est. Value: $309.6K

View on SEC EDGAR → Open Filing Document →

Form 4 Tax withholding Tax / Compensation Filing 2026-06-03

AMT insider Form 4 filed for equity award, exercise, or tax withholding

Meyer Robert Joseph (SVP & Advisor to the CFO) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`F`	Tax withholding on vested shares	153	$187.53	$28.7K

Filing: Form 4 (Insider Transaction) Insider: Meyer Robert Joseph (SVP & Advisor to the CFO) Shares: 153

View on SEC EDGAR → Open Filing Document →

Form 4 Gift Tax / Compensation Filing 2026-06-01

AMT insider Form 4 filed for equity award, exercise, or tax withholding

REEVE PAMELA D A (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were transferred as a gift, typically for estate or charitable planning. No sale into the market took place.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`G`	Gift	810	—	—

Filing: Form 4 (Insider Transaction) Insider: REEVE PAMELA D A (Director) Shares: 810

View on SEC EDGAR → Open Filing Document →

Form 4 Tax / Compensation Filing 2026-05-20

AMT insider Form 4 filed for equity award, exercise, or tax withholding

HORMATS ROBERT D (Insider) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Filing: Form 4 (Insider Transaction) Insider: HORMATS ROBERT D (Insider)

View on SEC EDGAR → Open Filing Document →

Proposed Insider Sales 2 · Form 144

A Form 144 is a notice of intent to sell restricted or control securities. It is not a record that anything was sold. American Tower Corporation has 2 such notices in this period.

The distinction matters because a Form 144 is frequently reported as though it were a completed insider sale. The filer may sell all of the shares covered, some of them, or none at all, and there is no obligation to update the notice either way. A sale that is actually executed by an officer or director shows up separately on a Form 4, which is the filing to check before treating a proposed sale as a real one.

Form 144 Proposed Insider Sale 2026-07-29

AMT Form 144 filed for proposed insider sale by ROBERT MEYER (5,000 shares) ~$894.4K

ROBERT MEYER filed a Form 144 with the SEC indicating intent to sell AMT (AMERICAN TOWER CORP /MA/) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: ROBERT MEYER Shares: 5,000 Est. Value: $894.4K

View on SEC EDGAR → Open Filing Document →

Form 144 Proposed Insider Sale 2026-07-28

AMT Form 144 filed for proposed insider sale by RUTH T DOWLING (1,791 shares) ~$298.6K

RUTH T DOWLING filed a Form 144 with the SEC indicating intent to sell AMT (AMERICAN TOWER CORP /MA/) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: RUTH T DOWLING Shares: 1,791 Est. Value: $298.6K

View on SEC EDGAR → Open Filing Document →

Material Events 10 · Form 8-K

An 8-K reports a material event in the window between scheduled reports. There are 10 in this period for American Tower Corporation. Each 8-K names the item number it is filed under, and that number is the fastest way to tell a routine disclosure from a consequential one.

Item 2.02 is an earnings release, Item 5.02 is a change of directors or officers, and Item 1.01 or 2.01 covers a material agreement or a completed acquisition. Item 7.01 and Item 8.01 are the general-purpose disclosure items and carry no fixed meaning on their own.

Form 8-K Material Company Update 2026-09-18