American Tower Corp. (AMT)

Sector:Technology
Super Investor Stats:
Ownership count:4
Ownership rank:204
% of all portfolios:0.026%
Hold Price * :$172.58
History Portfolio Manager Activity ▲ Share change % change to portfolio
Q1  2026
≡ Christopher Davis - Davis Advisors Add 1.02% 650 0.00
≡ Chuck Akre - Akre Capital Management Reduce 80.11% 204,495 0.56
≡ William Von Mueffling - Cantillon Capital Management Reduce 11.91% 218,052 0.25
Q4  2025
≡ William Von Mueffling - Cantillon Capital Management Add 0.81% 14,709 0.01
≡ Chuck Akre - Akre Capital Management Reduce 42.36% 187,576 0.36
≡ Mairs & Power Funds Reduce 33.36% 1,011 0.00
≡ Christopher Davis - Davis Advisors Reduce 2.59% 1,700 0.00
≡ Torray Funds Sell 100.00% 1,221 0.03
Q3  2025
≡ Mairs & Power Funds Add 47.14% 971 0.00
≡ Torray Funds Reduce 57.97% 1,684 0.04
≡ Chuck Akre - Akre Capital Management Reduce 51.62% 472,406 0.91
≡ Christopher Davis - Davis Advisors Reduce 28.35% 25,980 0.03
≡ William Von Mueffling - Cantillon Capital Management Reduce 1.09% 20,035 0.02
≡ Viking Global Investors Sell 100.00% 2,797,125 1.79
Q2  2025
≡ Mairs & Power Funds Add 1.98% 40 0.00
≡ Christopher Davis - Davis Advisors Add 3.05% 2,710 0.00
≡ Viking Global Investors Add 233.47% 1,958,329 1.25
≡ Torray Funds Reduce 93.99% 45,416 1.41
≡ Chuck Akre - Akre Capital Management Reduce 64.65% 1,673,943 3.62
≡ William Von Mueffling - Cantillon Capital Management Reduce 2.82% 53,339 0.07
Q1  2025
≡ Chuck Akre - Akre Capital Management Reduce 52.95% 2,914,221 6.10
≡ Viking Global Investors Reduce 6.52% 58,544 0.04
≡ William Von Mueffling - Cantillon Capital Management Reduce 3.00% 58,405 0.08
≡ Torray Funds Reduce 1.23% 602 0.02
≡ Christopher Davis - Davis Advisors Reduce 0.66% 590 0.00
Q4  2024
≡ William Von Mueffling - Cantillon Capital Management Add 0.53% 10,343 0.01
≡ Torray Funds Add 16.01% 6,752 0.18
≡ Christopher Davis - Davis Advisors Add 17.90% 13,590 0.02
≡ Viking Global Investors Buy 897,340 0.53
≡ Chuck Akre - Akre Capital Management Reduce 9.07% 549,119 0.87
≡ Thomas Gayner - Markel Group Sell 100.00% 51,910 0.11
Q3  2024
≡ Torray Funds Reduce 10.72% 5,063 0.16
≡ William Von Mueffling - Cantillon Capital Management Reduce 2.90% 57,953 0.08
≡ Chuck Akre - Akre Capital Management Reduce 1.33% 81,775 0.16
≡ Christopher Davis - Davis Advisors Reduce 0.17% 130 0.00
Q2  2024
≡ Torray Funds Add 0.82% 385 0.01
≡ Christopher Davis - Davis Advisors Add 14.08% 9,390 0.01
≡ William Von Mueffling - Cantillon Capital Management Reduce 4.83% 101,165 0.13
≡ Chuck Akre - Akre Capital Management Reduce 1.02% 63,518 0.11
≡ Lee Ainslie - Maverick Capital Sell 100.00% 1,188 0.00
Q1  2024
≡ Torray Funds Add 4.55% 2,041 0.06
≡ Christopher Davis - Davis Advisors Add 14.59% 8,490 0.01
≡ Lee Ainslie - Maverick Capital Buy 1,188 0.00
≡ Chuck Akre - Akre Capital Management Reduce 8.92% 606,774 0.99
≡ William Von Mueffling - Cantillon Capital Management Reduce 1.97% 42,054 0.05
Q4  2023
≡ Chuck Akre - Akre Capital Management Add 0.54% 36,375 0.07
≡ William Von Mueffling - Cantillon Capital Management Add 14.53% 271,293 0.39
≡ Christopher Davis - Davis Advisors Add 29.95% 13,410 0.02
≡ Torray Funds Add 72.52% 18,836 0.66
≡ Bill & Melinda Gates Foundation Trust Sell 100.00% 11,000 0.00
Q3  2023
≡ Chuck Akre - Akre Capital Management Add 0.35% 23,277 0.04
≡ Torray Funds Add 1.94% 494 0.01
≡ Bill & Melinda Gates Foundation Trust Buy 11,000 0.00
≡ Christopher Davis - Davis Advisors Reduce 29.40% 18,650 0.02
≡ William Von Mueffling - Cantillon Capital Management Reduce 0.39% 7,313 0.01
Q2  2023
≡ Torray Funds Add 0.76% 191 0.01
≡ Christopher Davis - Davis Advisors Add 2.44% 1,510 0.00
≡ William Von Mueffling - Cantillon Capital Management Add 6.35% 111,955 0.15
≡ Chuck Akre - Akre Capital Management Reduce 3.63% 253,751 0.41
Q1  2023
≡ Chuck Akre - Akre Capital Management Add 0.08% 5,271 0.01
≡ Christopher Davis - Davis Advisors Reduce 11.91% 8,370 0.01
≡ William Von Mueffling - Cantillon Capital Management Reduce 1.68% 30,104 0.05
≡ Torray Funds Reduce 0.70% 177 0.01
Q4  2022
≡ Chuck Akre - Akre Capital Management Add 0.29% 20,240 0.04
≡ Christopher Davis - Davis Advisors Reduce 11.51% 9,140 0.01
≡ Torray Funds Reduce 3.62% 956 0.04
≡ William Von Mueffling - Cantillon Capital Management Reduce 2.10% 38,506 0.07
Q3  2022
≡ Torray Funds Reduce 1.05% 281 0.01
≡ William Von Mueffling - Cantillon Capital Management Reduce 0.71% 13,128 0.03
Q2  2022
≡ Christopher Davis - Davis Advisors Add 3.38% 2,600 0.00
≡ Torray Funds Reduce 1.38% 373 0.02
≡ William Von Mueffling - Cantillon Capital Management Reduce 0.45% 8,318 0.02
≡ Chuck Akre - Akre Capital Management Reduce 0.36% 25,190 0.05
Q1  2022
≡ Christopher Davis - Davis Advisors Add 1.12% 850 0.00
≡ William Von Mueffling - Cantillon Capital Management Add 2.93% 52,784 0.09
≡ Torray Funds Reduce 4.62% 1,310 0.05
≡ Chuck Akre - Akre Capital Management Reduce 0.15% 10,720 0.02
Q4  2021
≡ Chuck Akre - Akre Capital Management Add 0.02% 1,310 0.00
≡ Christopher Davis - Davis Advisors Add 15.56% 10,230 0.01
≡ William Von Mueffling - Cantillon Capital Management Reduce 6.97% 134,825 0.26
≡ Torray Funds Reduce 3.28% 964 0.04
Q3  2021
≡ Christopher Davis - Davis Advisors Add 224.85% 45,510 0.06
≡ Torray Funds Reduce 3.22% 978 0.04
≡ William Von Mueffling - Cantillon Capital Management Reduce 1.66% 32,664 0.06
≡ Chuck Akre - Akre Capital Management Reduce 0.12% 8,475 0.01
Q2  2021
≡ Thomas Gayner - Markel Group Add 0.35% 180 0.00
≡ Christopher Davis - Davis Advisors Buy 20,240 0.02
≡ Torray Funds Reduce 2.40% 745 0.03
≡ William Von Mueffling - Cantillon Capital Management Reduce 1.12% 22,222 0.04
≡ Chuck Akre - Akre Capital Management Reduce 0.01% 640 0.00
Q1  2021
≡ Thomas Gayner - Markel Group Add 1.13% 580 0.00
≡ Torray Funds Add 19.68% 5,109 0.19
≡ William Von Mueffling - Cantillon Capital Management Reduce 3.71% 76,675 0.13
≡ Chuck Akre - Akre Capital Management Reduce 1.59% 113,656 0.18
Q4  2020
≡ Chuck Akre - Akre Capital Management Add 1.38% 97,189 0.15
≡ Torray Funds Reduce 1.89% 499 0.02
≡ William Von Mueffling - Cantillon Capital Management Reduce 0.49% 10,278 0.02
Q3  2020
≡ Torray Funds Add 0.80% 210 0.01
≡ William Von Mueffling - Cantillon Capital Management Reduce 1.06% 22,200 0.04
≡ Chuck Akre - Akre Capital Management Reduce 0.06% 4,570 0.01

* "Hold Price" is the last known price at which an investor still held a security. It is the closing price of the security as of the portfolio date (quarter end). This value is only provided when a security is owned by at least two investors. In the case of reporting dates being different, a weighted average price is calculated.