AMERICAN TOWER CORP /MA/ (AMT) insider trading
AMERICAN TOWER CORP /MA/ insiders have made 1 open-market purchase worth $64k since Oct 22, 2026, by 1 insider. The latest: Teresa Hillary Clarke (Director) bought $64k, filed Oct 22, 2026, scored 34 out of 100.
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Insider purchases
| Filed | Insider | Stake | Score | Bought | 1 week | 1 month |
|---|---|---|---|---|---|---|
| Oct 22 Form 4 (opens sec.gov) |
Teresa Hillary ClarkeDirectorDirector · Near 52-week high | +6% stake | 34 | $64k 338 at $188.38 |
−0.6% | waiting |
Track record (hypothetical): a week after the filing, these buys averaged −0.6% (0% up, 1 measured).
Insider sales
1 open-market sale on record
| Filed | Insider | Sold |
|---|---|---|
| Oct 30 Form 4 (opens sec.gov) |
Ruth T. DowlingChief Admin Ofr · planned (10b5-1) | $291k 1,578 at $184.30 · 6% of holdings |
Most insider sales are planned in advance or made for personal reasons, so a sale says less than a buy.
AMT trades reported by members of Congress
| Reported | Member | Trade | Amount |
|---|---|---|---|
| Jul 21 |  Alan ArmstrongR-OK · Senate116 days after the trade | Sale | $1K–$15K |
Members of Congress report trades up to 45 days later, in dollar ranges. Every member's trades.
Planned insider sales of AMT (Form 144)
| Filed | Insider | To sell |
|---|---|---|
| Oct 30 Form 144 | JUAN FONT HERNANDEZOfficer · no trading plan named | $112k 592 shares from Oct 30 |
| Oct 28 Form 144 | RUTH T DOWLINGOfficer · 10b5-1 plan | $290k 1,578 shares from Oct 28 |
A Form 144 is filed before an insider sells restricted or control shares; the Form 4 reports the sale once made.
Insiders who bought AMT
- Teresa Hillary Clarke Director
Questions
Are insiders buying AMT stock?
Yes. In the last 90 days, 1 open-market purchase was filed, worth $64k, against $291k of open-market sales.
Who bought AMT stock most recently?
Teresa Hillary Clarke, Director, bought 338 shares for $64k (Form 4 (opens sec.gov), filed Oct 22, 2026).
How does InsiderBeacon score an insider buy?
Out of 100, from who bought, how much their stake grew, the size of the trade, whether other insiders bought within ten days, where the price sat in its 52-week range, and whether it was a first or a routine buy. The score is fixed when the filing arrives. The formula and the research behind it.
Insiders are also buying, same industry
Data as of Oct 30, 2026, from SEC EDGAR Form 4 filings: open-market purchases (code P) of $25,000 or more, and open-market sales. Every row links to its filing. Scores summarise what a filing says (how the score works); outcomes are hypothetical, from the first close after the filing, and past results don't predict future ones. Disclaimer