Filings Radar

SEC 8-K and 6-K filings classified by Claude with reasoning, plus Form 4 insider transactions. Ingested from EDGAR’s filing stream in near-real time, reconciled overnight.

AMERICAN TOWER CORP /MA/ (AMT)

CIK 0001053507 9 material events

Insider activity (SEC Form 4)

Open-market buys and sells only — the deliberate trades. Zero here doesn’t mean no filings: grants, option exercises and tax withholding (below) are compensation, not market trades.

Open-market · last 30 days: 1 buyer bought $501K 0 sellers sold $0
Open-market · last 90 days: 1 buyer bought $501K 2 sellers sold $1.2M
InsiderRoleDateTransactionSharesValue
Kalathur Rajesh Director 2026-08-21 Open-market buy 2829 $501K
Dowling Ruth T EVP, Chief Admin Ofr, GC & Sec 2026-07-29 Open-market sell 10b5-1 1106 $194K
Meyer Robert Joseph SVP & Advisor to the CFO 2026-07-29 Open-market sell 5000 $894K
Dowling Ruth T EVP, Chief Admin Ofr, GC & Sec 2026-07-28 Open-market sell 10b5-1 685 $116K
Meyer Robert Joseph SVP & Advisor to the CFO 2026-06-01 Tax withholding 153 $29K
REEVE PAMELA D A Director 2026-05-28 Gift 810 $0
Dowling Ruth T EVP, Chief Admin Ofr, GC & Sec 2026-04-29 Open-market sell 10b5-1 416 $74K
Dowling Ruth T EVP, Chief Admin Ofr, GC & Sec 2026-04-28 Open-market sell 10b5-1 556 $99K
Dowling Ruth T EVP, Chief Admin Ofr, GC & Sec 2026-03-11 Tax withholding 863 $158K
Font Juan SVP, Pres. & CEO, CoreSite 2026-03-11 Tax withholding 928 $170K
Meyer Robert Joseph SVP & Chief Accounting Officer 2026-03-11 Tax withholding 684 $125K
Noel Eugene M EVP & Chief Operating Officer 2026-03-11 Tax withholding 719 $131K
Rossi Richard C EVP & President, U.S. Tower 2026-03-11 Tax withholding 684 $125K
Smith Rodney M EVP, CFO & Treasurer 2026-03-11 Tax withholding 1295 $237K
Vondran Steven O President and CEO, Director 2026-03-11 Tax withholding 2158 $395K
Chambliss Kelly C Director 2026-03-10 Grant/award 1209 $0
Clarke Teresa Hillary Director 2026-03-10 Grant/award 1209 $0
Dowling Ruth T EVP, Chief Admin Ofr, GC & Sec 2026-03-10 Grant/award 6878 $0
Dowling Ruth T EVP, Chief Admin Ofr, GC & Sec 2026-03-10 Tax withholding 6629 $1.2M
Font Juan SVP, Pres. & CEO, CoreSite 2026-03-10 Grant/award 8060 $0
Most recent 20 reported transactions. Open-market buys (P) and sells (S) are the deliberate ones; grants and option exercises are compensation. Not investment advice.

Risk Radar (year-over-year Risk Factors)

← All Risk Radar

Fiscal period ending 2025-12-31 versus 2024-12-31view filing on EDGAR →

Customer concentration and litigation risk have materially escalated, with newly named disputes against AT&T Mexico ($300M revenue at risk, $30M reserves) and DISH (payment default plus 2-4% property revenue loss from network decommissioning) anchoring a broad deterioration across multiple themes. Operational risk expanded on two fronts — data center segment risks (capital intensity, power constraints, construction delays) and newly disclosed physical infrastructure threats (theft, vandalism, fiber cuts with uninsurable costs) — while $37.2B in debt and a share repurchase program constrain financial flexibility. A single removal of a prior customer-concentration disclosure provides marginal offset but does not meaningfully counter the weight of new exposures across litigation, competition, operations, capital structure, and macro themes.

6 company-specific · 1 eased/removed · 3 common-mode

Company-specific changes

New Materialized

New disclosure of two material customer disputes: AT&T Mexico ($300M revenue, $30M reserves, escrow arrangement) and DISH (payment default). Substantive litigation risk newly disclosed.

Our business, results of operations and financial condition could be negatively impacted by disputes with our customers. In the ordinary course of our business, we occasionally experience disputes…

Materialized 2026-06-04 · Other material view 8-K →

The risk factor warned that customer disputes could lead to a termination of leases or agreements; the disclosure confirms that the Company terminated its Strategic Collocation Agreement with DISH and is pursuing litigation against DISH with respect to its obligations under the SCA, directly realizing the warned-of consequence of a dispute leading to termination of a customer agreement.

The Company delivered a notice of termination, effective June 2, 2026, to DISH of the Company's Strategic Collocation Agreement entered into in March 2021 (the "SCA") and related agreements with DISH.

New Materialized

New disclosure of customer concentration risk and specific DISH revenue loss (2-4% of property revenue) from spectrum sales and network decommissioning.

For the year ended December 31, 2025 2024 2023 T-Mobile 18 % 19 % 19 % AT&T 17 % 18 % 18 % Verizon Wireless 14 % 13 % 14 % Telefónica 10 % 10 % 10 % One or more of our customers, or their parent…

Materialized 2026-06-04 · Other material view 8-K →

The risk factor warns that customers may reduce or terminate their operations, causing revenue loss; the disclosure confirms that DISH's Strategic Collocation Agreement was terminated and that 100% of DISH revenue has been reflected in churn, directly realizing the warned-of consequence of a customer relationship ending and associated revenue loss.

The Company delivered a notice of termination, effective June 2, 2026, to DISH of the Company's Strategic Collocation Agreement entered into in March 2021 (the "SCA") and related agreements with DISH.

New

New disclosure of material operational risks in data center segment (10% of revenues). Identifies significant capital requirements, power constraints, construction delays, and service-level obligations that differ materially from core tower business.

Our data center segment contains certain operational differences from our tower leasing operations, resulting in different operational risks. If we do not successfully operate our data center segment…

Revised

New disclosure of $37.2B debt, $9.6B available borrowing capacity, and material share repurchase program risk. Repurchases could diminish cash reserves and impair growth/acquisition capacity.

Risks Related to Our Financial Performance or General Economic Conditions Our leverage, debt service obligations and repurchase activity may materially and adversely affect our ability to raise…

Revised

Added specific 2% churn metric and escalated risk from general competition to quantified customer concentration threat with larger customers.

Increasing competition within our industries may materially and adversely affect our revenue. Our industries are highly competitive and our customers have numerous alternatives in leasing…

Revised

New disclosure of theft, vandalism, and fiber cuts as material operational risks with uninsurable costs and reputational harm. Also expanded data center operational risk language.

Our towers, data centers, other telecommunications assets or computer systems may be affected by natural disasters (including as a result of climate change), public perception of health risks and…

Eased / removed

Removed

Removal of material customer concentration risk disclosure suggests improved diversification or reduced dependency on few customers, materially easing a previously disclosed revenue vulnerability.

A substantial portion of our current and projected future revenue is derived from a small number of customers, and we are sensitive to adverse changes in the creditworthiness and financial strength…

Also disclosed — common-mode (Generative AI competition disruption, AI regulatory compliance, Tariffs trade policy)
Generative AI competition disruption New

New disclosure of material customer concentration risk and dependency on small number of customers for revenue and growth projections. Reasonable investor would act on this.

A substantial portion of our current and projected future revenue is derived from a small number of customers, and we are sensitive to adverse changes in the creditworthiness and financial strength…

AI regulatory compliance New

New disclosure of data governance and AI risks including fraud, data leakage, regulatory noncompliance, and reputational harm. Material operational and compliance exposure.

Our business depends on effective data governance, and failures in our data governance frameworks could adversely affect our operations. Our business depends on our ability to appropriately collect…

Tariffs trade policy Revised

Added explicit tariff policy risk and new material disclosure on capital raising constraints, refinancing risk, and credit rating impacts from market volatility.

Increased inflation and interest rates may adversely affect us by increasing costs beyond what we can recover through price increases. The United States and other large global economies experienced…

Material year-over-year changes to this company's Risk Factors (Item 1A), found by comparing each annual report to the prior year, judged for materiality, and classified as company-specific or common-mode against the cross-company catalog. Common-mode changes are the macro themes many companies disclose in common; they are collapsed above. A filing marked unchanged had no material change from the prior year; its summary describes the company's standing risks, which remain in force. Fiscal periods are the reporting period ends. Not investment advice.

Debt Issuance

8-K filed 2026-09-09 confidence 95% Item 8.01

American Tower Corporation announced the pricing of a registered public offering of senior unsecured notes totaling $1.6 billion in aggregate principal amount across three tranches (2031, 2033, and 2036 notes). This constitutes the creation of new direct financial obligations through debt issuance, with specified interest rates and pricing. The company intends to use net proceeds of $1,579.9 million to repay existing debt and for general corporate purposes, which is material to investors assessing the registrant's capital structure and financial obligations.

View raw filing on EDGAR →

Earnings release

8-K filed 2026-07-28 confidence 98% Item 2.02

American Tower Corporation issued a press release on July 28, 2026 announcing financial results for the quarter ended June 30, 2026, disclosing Q2 2026 revenue of $2,749 million (4.7% growth), net income of $888 million (133.2% growth), Adjusted EBITDA of $1,808 million (3.2% growth), and AFFO per share of $2.71 (4.2% growth), along with updated full-year 2026 guidance. This is a standard quarterly earnings release with comprehensive financial metrics and forward guidance, clearly falling under Item 2.02 disclosure requirements.

View raw filing on EDGAR →

Other material

8-K filed 2026-06-04 confidence 72% Item 8.01

American Tower terminated its Strategic Collocation Agreement with DISH effective June 2, 2026, and is pursuing litigation against DISH regarding SCA obligations. While the company states the termination is not expected to impact 2026 financial results (as DISH revenue was already fully reflected in churn as of January 1, 2026), the termination of a material commercial agreement and ongoing litigation represent a significant business event that would affect a reasonable investor's assessment of the company's customer relationships and revenue stability. This does not fit neatly into the more specific categories (not a restatement, impairment, covenant breach, or litigation settlement), making "other_material" the most appropriate classification.

View raw filing on EDGAR →

Other material

8-K filed 2026-06-02 confidence 75% Item 8.01

American Tower Corporation announced a partial redemption of €250 million of its €600 million outstanding 4.125% senior unsecured notes due 2027, with a redemption date of June 18, 2026. While this is a material debt management action affecting the company's capital structure and outstanding obligations, it does not fit neatly into the more specific event categories (covenant_breach, ma_activity, or material_impairment). The redemption is a routine debt reduction exercise executed within the contractual terms of the indenture, making "other_material" the most appropriate classification.

View raw filing on EDGAR →

Other material

8-K filed 2026-05-27 confidence 65% Item 1.01

American Tower completed a registered public offering of €750 million in senior unsecured notes due 2033, generating approximately $866.7 million in net proceeds. This significant debt issuance affects the company's capital structure and liquidity.

View raw filing on EDGAR →

Shareholder vote

8-K filed 2026-05-21 confidence 98% Item 5.07

American Tower held its Annual Meeting on May 20, 2026, with shareholders voting on four proposals: election of eleven directors, advisory approval of executive compensation, ratification of Deloitte & Touche LLP as auditor, and approval of the 2026 Equity Incentive Plan. The filing discloses the final vote tallies for all four proposals.

View raw filing on EDGAR →

Exec Compensation

8-K filed 2026-05-21 confidence 95% Item 5.02

Stockholders approved the 2026 Equity Incentive Plan on May 20, 2026, authorizing issuance of up to 12,000,000 new shares plus additional shares from the Prior Plan for equity-based awards to employees, directors, consultants, and advisors, along with adoption of RSU and PSU award agreement forms.

View raw filing on EDGAR →

Other material

8-K filed 2026-05-21 confidence 65% Item 8.01

The Board declared a cash distribution of $1.79 per share to shareholders, which is material to investors as it affects shareholder returns and cash flow.

View raw filing on EDGAR →

Other material

8-K filed 2026-05-19 confidence 75% Item 8.01

American Tower Corporation announced the pricing of a €750 million registered public offering of senior unsecured notes due 2033 at 4.000% per annum. This is a material debt issuance that would affect investor assessment of the company's capital structure and financing activities, but it does not fit neatly into the more specific event categories (it is neither a dilutive equity issuance under Item 3.02, nor an M&A activity, nor a covenant breach). The disclosure is appropriately classified as other_material.

View raw filing on EDGAR →