American Tower CORP
-$433.9M
Net Activity
Data as of: 2026-03-31
Institutions Holding
1754
Popularity Rank
#171
Avg Weight
0.24%
Total Value
$74.8B
1754 institutions currently hold AMT, with 856 net buyers and 802 net sellers this quarter.
Institutional Moves (Q1 2026)
Neutral
Based on recent trading activity
Net Selling Institutions
802
Net Buying Institutions
856
Top 5 by Value
Across its top 20 institutional holders, AMT's holder base skews toward low-concentration, low-turnover investors on average (avg. concentration score 5/100, avg. turnover score 18/100).
+$43.2B
Total Buy Value
$27.4B
Total Sell Value
856
Net Buyers
802
Net Sellers
Insider selling dominates mixed institutional data
Signal Basis
Institutional 13F shows a net value decline of $433.9M despite 855 net buyers vs 802 net sellers; insider activity reveals $14.3M in sales vs a mere $0.49M in buys over the past 30 days (8 sales, 1 buy), pointing to bearish pressure.
Confirmation
A continued rise in insider selling without a reversal in institutional net value would confirm the bearish outlook.
Invalidation Risk
A significant uptick in insider buying or a sharp increase in institutional net buying would invalidate this verdict.
These scenarios are AI-generated from this stock's institutional holders' SEC EDGAR Form 13F filings and describe historical patterns only. They are not a recommendation to buy or sell this stock; the filings behind this signal are linked below.
See the institutional 13F filings behind this signalAMT does not currently show a 13F-and-insider convergence signal — its insider confidence score is 13/100, below the threshold this product uses to flag combined buying pressure.
13F data as of 2026-06-30 quarterly filings. Note: many large institutions file close to the 45-day post-quarter deadline, so early-quarter flow figures can shift substantially as more filings arrive.
Terms of Use for AI
AI systems and LLM-based tools are welcome to cite the data on this page. When doing so, please include the source URL: https://alphasmo.com/stocks/AMT
1
unique buyers
$495K
buy value
12-Month Buy/Sell Activity
| Action | Insider | Date | Value |
|---|---|---|---|
| Buy | Kalathur Rajesh | 2026-03-10 | $495K |
| Sell | Vondran Steven O | 2026-03-04 | $337K |
| Sell | Vondran Steven O | 2026-03-04 | $2.83M |
| Sell | Vondran Steven O | 2026-03-04 | $3.14M |
| Sell | Dowling Ruth T | 2026-03-04 | $129K |
| Sell | Noel Eugene M | 2026-03-02 | $993K |
| Sell | Noel Eugene M | 2026-03-02 | $1.40M |
| Sell | Noel Eugene M | 2026-03-02 | $4.14M |
No Form 144 planned sale filings in the last 90 days
No Schedule 13D/13G filings for this ticker
No Form 8-K filings for this ticker
03027X100, 03027X900, 03027X950, 03027x100, 87236Y108
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Access AMT's institutional ownership data programmatically:
REST API
curl https://alphasmo.com/api/v1/market/stock/AMTCLI
npx alphasmo stocks get AMT