Bradley E. Singer is Treasurer at AMERICAN TOWER CORP /MA/ (AMT). They have made 11 open-market trades across 5 companies since 2006, most recently 2026-06-11.
CIK 0001159423
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
3 open-market purchases totalling $2.0M since 2008, against 8 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| MSI | 8,213,576 | $3.8B |
| AMT | 35,100 | $6.5M |
| DISCA | 95,475 | $2.3M |
| SG | 176,922 | $1.8M |
| RDFN | 58,658 | $656K |
| WRBY | 25,030 | $584K |
| CCI | 5,474 | $450K |
| MSO | 4,325 | — |
| CZN | 20,883 |
Shares reported on the most recent Form 4, priced at the 2026-06-15 close. 2 holdings could not be priced and are excluded from the total.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| WRBY | SELL | 2026-05-13 | 2026-05-15 | $28.61 | $715K | -10.7% | -8.3% | -10.1% |
| WRBY | SELL | 2026-03-04 | 2026-03-06 | $27.53 | $435K | -0.3% | -12.7% | -0.0% |
| SG | SELL | 2024-11-20 | 2024-11-20 | $38.09 | $3.3M | +0.6% | -8.4% | -35.8% |
| SG | SELL | 2024-11-13 | 2024-11-15 | $39.70 | $289K | +24.6% | +3.1% | -20.2% |
| WRBY | BUY | 2024-08-13 | 2024-08-14 | $12.88 | $966K | +13.9% | +6.4% | +54.2% |
| SG | SELL | 2024-05-16 | 2024-05-20 | $32.30 | $3.9M | -8.2% | -12.2% | +4.0% |
| RDFN | BUY | 2022-05-09 | 2022-05-11 | $11.20 | $560K | +16.0% | +7.9% | +24.5% |
| MSI | SELL | 2016-03-18 | 2016-03-22 | $72.81 | $61.7M | +3.6% | +1.8% | -7.2% |
| DISCA | SELL | 2012-03-14 | 2012-03-16 | $48.06 | $4.9M | -2.3% | +1.1% | +1.1% |
| DISCA | SELL · 10b5-1 | 2012-03-01 | 2012-03-05 | $46.47 | $4.2M | -2.3% | +1.1% | +1.1% |
| DISCA | SELL · 10b5-1 | 2011-12-01 | 2011-12-05 | $41.45 | $3.1M | -2.3% | +1.1% | +1.1% |
| DISCA | SELL · 10b5-1 | 2011-11-10 | 2011-11-14 | $41.71 | $4.2M | -2.3% | +1.1% | +1.1% |
| DISCA | SELL · 10b5-1 | 2011-08-11 | 2011-08-15 | $38.00 | $3.2M | -2.3% | +1.1% | +1.1% |
| DISCA | SELL · 10b5-1 | 2011-05-16 | 2011-05-17 | $43.77 | $4.4M | -2.3% | +1.1% | +1.1% |
| DISCA | SELL · 10b5-1 | 2011-03-01 | 2011-03-03 | $42.23 | $6.3M | -2.3% | +1.1% | +1.1% |
| DISCA | SELL | 2010-08-09 | 2010-08-11 | $38.07 | $6.7M | -2.3% | +1.1% | +1.1% |
| DISCA | BUY | 2008-11-18 | 2008-11-19 | $12.73 | $509K | -2.3% | +1.1% | +1.1% |
| AMT | SELL · 10b5-1 | 2008-05-14 | 2008-05-15 | $45.34 | $3.4M | -4.3% | +0.4% | +0.4% |
| AMT | SELL · 10b5-1 | 2008-03-14 | 2008-03-18 | $36.96 | $3.5M | -4.3% | +0.4% | +0.4% |
| AMT | SELL · 10b5-1 | 2007-11-15 | 2007-11-15 | $43.49 | $418K | -4.3% | +0.4% | +0.4% |
| AMT | SELL · 10b5-1 | 2007-11-15 | 2007-11-15 | $43.05 | $3.0M | -4.3% | +0.4% | +0.4% |
| AMT | SELL · 10b5-1 | 2007-08-16 | 2007-08-20 | $37.42 | $2.0M | -4.3% | +0.4% | +0.4% |
| AMT | SELL · 10b5-1 | 2007-08-16 | 2007-08-20 | $37.81 | $1.1M | -4.3% | +0.4% | +0.4% |
| AMT | SELL · 10b5-1 | 2006-03-10 | 2006-03-13 | $29.94 | $898K | -4.3% | +0.4% | +0.4% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.
| — |
| Total | $3.8B |