Stock Trading Canary

United States · SEC Form 4 · Snapshot date: 2026-10-18 · Built: 2026-10-18 · 中文

← United States · Coverage record

US · SEC FORM 4

AMERICAN TOWER CORP /MA/

AMT · NYSE · CIK 0001053507 · Real Estate · REIT—Specialty

INSIDER SIGNAL

No active buy signal

1 qualifying P purchase group
in the current 180-day scoring window

9 Form 4 transaction lines observed in the same window
5 sales · 3 option, withholding, award, gift or other lines

Last qualifying purchase2026-08-21 · Kalathur Rajesh · $500.7K

WHY NO ACTIVE SIGNAL?

Purchase activityPresent
Recent buying1 qualifying line group(s)
Recent salesModerate
Buy signal statusInactive
Score anatomy

No score is calculated because there is no qualifying purchase in the active window. Unavailable inputs are not treated as zero or as a bearish signal.

ClusterNot calculated
Purchase sizeNot calculated
RoleNot calculated
RecencyNot calculated
ConvictionNot calculated

Why is there no score?

  • No qualifying open-market purchase supplies cluster, size, role, recency or conviction inputs.
  • Sales and other Form 4 activity remain visible as context and do not create a negative score.

Sales and other Form 4 activity are shown separately and do not create a negative buy signal. Absence of buying is not scored as bearish.

Insider activity timeline

Owner lanes show the latest 180 days. Symbol shape identifies the transaction type; sales remain context only.

AprMayJunJulAugSepOct
Dowling Ruth TEVP, Chief Admin Ofr, GC & Sec
▼▼▼▼
Meyer Robert JosephSVP & Advisor to the CFO
○▼
REEVE PAMELA D ADirector
○
Kalathur RajeshDirector
●
Blanchett PaulSVP & Chief Accounting Officer
○
● Purchase▼ Sale○ Other

—

Purchase breadth & concentration

QUALIFYING BUYERS1
PURCHASE CONCENTRATION100%Largest buyer: Kalathur Rajesh · $500.7K
CLUSTER BUYING · 15D1 insiderPeak activity: 2026-08-21–2026-08-21

Roles in the peak window: Director. Concentration uses priced qualifying P lines only and does not change the saved score.

SIGNAL HISTORY

No recorded active-signal snapshot

Scores are archived only when the company qualifies for a published US buy-signal snapshot. Last qualifying purchase: 2026-08-21 · Kalathur Rajesh.

Recent Form 4 activity

3Purchases
19Sales
42Other Form 4 lines
36SEC filings · 365 days
BUYING1 qualifying P line(s) · 180 days
SELLING5 sale line(s) · context only
OTHER3 exercise / withholding / award / gift / other lines
10b5-1 / PLANNEDNot assessed

P is an open-market or private purchase. S is a sale. M, F, A and G usually describe exercises, tax withholding, awards and gifts. These categories remain visually separate.

Market context

Market context provides additional background on recent price performance and risk. It does not affect the Insider Signal.

Price performance

1M
-6.2%
3M
+0.1%
6M
-6.6%
12M
—

Volatility & liquidity

Volatility
26.5%
Beta
0.90
Avg daily value
USD 429.6M

Valuation

Market cap
USD 75.6B
P/E
22.3×

Fundamentals

Profit margin
24.7%
ROE
72.0%
Industry
REIT—Specialty

Market data

Price data up to: 2026-10-03 · Price source: OpenBB/yfinance · From SEC filings: Profit margin, ROE · Fiscal year ended: 2025-12-31 · From Yahoo Finance: Market cap, P/E · Status: PASS

Short interest

Short interest is external context reported to FINRA by broker-dealers. It does not affect the Insider Signal.

Shares short
7,349,221
Previous report
6,084,092
Avg daily volume
3,021,983
Days to cover
2.4

FINRA settlement date: 2026-09-30 · Captured 2026-10-12 · FINRA equity short interest ↗. A share count, published about a week after each of two settlement dates a month; not a percentage of shares outstanding.

Historical equity purchases

Qualifying code P transactions in the local Form 4 history, including purchases outside the current signal window.

Transaction dateReporting ownerTypeSecuritySharesAvg. priceApprox. valueSource
2026-08-21Kalathur RajeshPurchase (P)Common Stock2,829USD 177.00USD 500,733SEC filing ↗
2026-03-10Kalathur RajeshPurchase (P)Common Stock2,671USD 185.30USD 494,936SEC filing ↗
2025-10-31REILLY EUGENE FPurchase (P)Common Stock5,554USD 178.99USD 994,110SEC filing ↗
2023-02-02Goel SanjayPurchase (P)Common Stock5USD 232.56USD 1,163SEC filing ↗
2022-10-26Goel SanjayPurchase (P)Common Stock5USD 197.16USD 986SEC filing ↗
2022-04-29Tanner Bruce LPurchase (P)Common Stock9USD 244.96USD 2,205SEC filing ↗
2022-01-14Tanner Bruce LPurchase (P)Common Stock4USD 252.12USD 1,008SEC filing ↗
2021-02-02Smith Rodney MPurchase (P)Common Stock21USD 236.59USD 4,968SEC filing ↗
2020-10-16Smith Rodney MPurchase (P)Common Stock20USD 241.95USD 4,839SEC filing ↗
2020-07-10Smith Rodney MPurchase (P)Common Stock17USD 263.98USD 4,488SEC filing ↗
2020-04-29Smith Rodney MPurchase (P)Common Stock18USD 239.23USD 4,306SEC filing ↗

Form 4 evidence

64 transaction lines in the latest 365-day window; 564 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-01Blanchett PaulAward / grant (A)Common Stock16,299USD 0.00USD 0SEC filing ↗
2026-08-21Kalathur RajeshPurchase (P)Common Stock2,829USD 177.00USD 500,733SEC filing ↗
2026-07-29Meyer Robert JosephSale (S)Common Stock5,000USD 178.89USD 894,450SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-01Blanchett PaulAward / grant (A)Common Stock16,299USD 0.00USD 0SEC filing ↗
2026-08-21Kalathur RajeshPurchase (P)Common Stock2,829USD 177.00USD 500,733SEC filing ↗
2026-07-29Meyer Robert JosephSale (S)Common Stock5,000USD 178.89USD 894,450SEC filing ↗
2026-07-29Dowling Ruth TSale (S)Common Stock1,106USD 174.96USD 193,506SEC filing ↗
2026-07-28Dowling Ruth TSale (S)Common Stock685USD 169.54USD 116,135SEC filing ↗
2026-06-01Meyer Robert JosephTax withholding (F)Common Stock153USD 187.53USD 28,692SEC filing ↗
2026-05-28REEVE PAMELA D AGift (G)Common Stock810USD 0.00USD 0SEC filing ↗
2026-04-29Dowling Ruth TSale (S)Common Stock416USD 177.54USD 73,857SEC filing ↗
2026-04-28Dowling Ruth TSale (S)Common Stock556USD 178.48USD 99,235SEC filing ↗
2026-03-11Vondran Steven OTax withholding (F)Common Stock2,158USD 182.85USD 394,590SEC filing ↗
2026-03-11Smith Rodney MTax withholding (F)Common Stock1,295USD 182.85USD 236,791SEC filing ↗
2026-03-11Rossi Richard CTax withholding (F)Common Stock684USD 182.85USD 125,069SEC filing ↗
2026-03-11Noel Eugene MTax withholding (F)Common Stock719USD 182.85USD 131,469SEC filing ↗
2026-03-11Meyer Robert JosephTax withholding (F)Common Stock684USD 182.85USD 125,069SEC filing ↗
2026-03-11Font JuanTax withholding (F)Common Stock928USD 182.85USD 169,685SEC filing ↗
2026-03-11Dowling Ruth TTax withholding (F)Common Stock863USD 182.85USD 157,800SEC filing ↗
2026-03-10Vondran Steven OTax withholding (F)Common Stock15,269USD 186.12USD 2,841,866SEC filing ↗
2026-03-10Vondran Steven OAward / grant (A)Common Stock20,955USD 0.00USD 0SEC filing ↗
2026-03-10Tanner Bruce LAward / grant (A)Common Stock1,209USD 0.00USD 0SEC filing ↗
2026-03-10Smith Rodney MTax withholding (F)Common Stock12,433USD 186.12USD 2,314,030SEC filing ↗
2026-03-10Smith Rodney MAward / grant (A)Common Stock10,531USD 0.00USD 0SEC filing ↗
2026-03-10Rossi Richard CTax withholding (F)Common Stock1,544USD 186.12USD 287,369SEC filing ↗
2026-03-10Rossi Richard CAward / grant (A)Common Stock6,448USD 0.00USD 0SEC filing ↗
2026-03-10Ray Neville RAward / grant (A)Common Stock1,209USD 0.00USD 0SEC filing ↗
2026-03-10REILLY EUGENE FAward / grant (A)Common Stock1,209USD 0.00USD 0SEC filing ↗
2026-03-10REEVE PAMELA D AAward / grant (A)Common Stock1,209USD 0.00USD 0SEC filing ↗
2026-03-10Noel Eugene MTax withholding (F)Common Stock2,498USD 186.12USD 464,928SEC filing ↗
2026-03-10Noel Eugene MAward / grant (A)Common Stock8,167USD 0.00USD 0SEC filing ↗
2026-03-10Meyer Robert JosephTax withholding (F)Common Stock1,368USD 186.12USD 254,612SEC filing ↗
2026-03-10Meyer Robert JosephAward / grant (A)Common Stock4,030USD 0.00USD 0SEC filing ↗

Multiple price lines in one filing are grouped and share-weighted. Price and value are blank when a grouped filing line lacks price evidence.

Snapshot & identity

Snapshot date2026-10-18
Ranking versionUS-v1.2
Data qualityPASS ELIGIBLE · —
TickerAMT
CIK0001053507
SectorReal Estate
IndustryREIT—Specialty Yahoo Finance
SEC SIC6798 Real Estate Investment Trusts
ExchangeNYSE

Data coverage

Local Form 4 history564 transaction lines from 2020-01-02 to 2026-10-01
11 P purchase lines · 196 S sale lines · 357 other lines
SEC company submissionsOpen SEC filings ↗

Local ledger as of 2026-10-18. Mapping status is an audit field and does not erase SEC filing evidence.