AMERICAN TOWER CORP NEW

Ticker: AMT CUSIP: 03027X100 Class: COM

Barton Investment Management's Holding History (CIK: 0001387818)

Note: Option positions (PUT/CALL) are excluded.

Q4 2025

Shares 79,208 Value ($000) $13,907 Avg Close $180.30 Range $169.12 - $192.63

Q3 2025

Shares 81,078 Value ($000) $15,593 Avg Close $204.56 Range $185.10 - $230.04

Q2 2025

Shares 82,633 Value ($000) $18,264 Avg Close $210.37 Range $190.80 - $225.87

Q1 2025

Shares 85,463 Value ($000) $18,597 Avg Close $189.52 Range $166.66 - $212.16

Q4 2024

Shares 87,051 Value ($000) $15,966 Avg Close $198.35 Range $171.45 - $222.90

Q3 2024

Shares 88,309 Value ($000) $20,537 Avg Close $210.79 Range $182.10 - $231.55

Q2 2024

Shares 89,732 Value ($000) $17,442 Avg Close $176.27 Range $160.72 - $190.06

Q1 2024

Shares 104,227 Value ($000) $20,594 Avg Close $186.13 Range $169.29 - $204.74

Q4 2023

Shares 105,561 Value ($000) $22,789 Avg Close $175.15 Range $141.88 - $204.01

Q3 2023

Shares 107,586 Value ($000) $17,693 Avg Close $167.65 Range $145.17 - $184.31

Q2 2023

Shares 110,446 Value ($000) $21,420 Avg Close $178.08 Range $162.53 - $192.95

Q1 2023

Shares 112,043 Value ($000) $22,895 Avg Close $189.59 Range $171.12 - $212.87

Q4 2022

Shares 113,631 Value ($000) $24,074 Avg Close $186.71 Range $159.82 - $204.49

Q3 2022

Shares 118,261 Value ($000) $25,391 Avg Close $228.80 Range $188.24 - $251.54

Q2 2022

Shares 119,951 Value ($000) $30,658 Avg Close $222.20 Range $196.54 - $240.37

Q1 2022

Shares 120,166 Value ($000) $30,188 Avg Close $214.86 Range $193.72 - $257.60

Q4 2021

Shares 125,326 Value ($000) $36,658 Avg Close $239.48 Range $222.02 - $259.23

Q3 2021

Shares 139,371 Value ($000) $36,990 Avg Close $248.67 Range $232.43 - $264.88

Q2 2021

Shares 140,332 Value ($000) $37,909 Avg Close $221.28 Range $204.65 - $239.67

Q1 2021

Shares 140,226 Value ($000) $33,522 Avg Close $192.28 Range $170.54 - $209.67

Q4 2020

Shares 151,016 Value ($000) $33,897 Avg Close $199.71 Range $184.97 - $217.31

Q3 2020

Shares 152,446 Value ($000) $36,850 Avg Close $216.72 Range $200.88 - $232.60

Q2 2020

Shares 155,335 Value ($000) $40,160 Avg Close $210.56 Range $171.21 - $229.12

Q1 2020

Shares 156,205 Value ($000) $34,014 Avg Close $197.22 Range $147.72 - $219.16

Q4 2019

Shares 159,360 Value ($000) $36,624 Avg Close $183.82 Range $171.19 - $195.06

Q3 2019

Shares 159,327 Value ($000) $35,232 Avg Close $183.38 Range $167.57 - $203.29

Q2 2019

Shares 159,863 Value ($000) $32,684 Avg Close $168.17 Range $157.69 - $183.80

Q1 2019

Shares 159,808 Value ($000) $31,492 Avg Close $146.03 Range $128.16 - $164.30

Q4 2018

Shares 163,558 Value ($000) $25,873 Avg Close $129.50 Range $116.26 - $139.59

Q3 2018

Shares 167,450 Value ($000) $24,330 Avg Close $120.79 Range $114.07 - $125.11

Q2 2018

Shares 168,144 Value ($000) $24,241 Avg Close $113.83 Range $109.35 - $119.75

Q1 2018

Shares 172,044 Value ($000) $25,005 Avg Close $114.77 Range $106.21 - $122.30

Q4 2017

Shares 175,779 Value ($000) $25,078 Avg Close $115.75 Range $109.97 - $125.87

Q3 2017

Shares 177,360 Value ($000) $24,242 Avg Close $112.31 Range $105.52 - $119.95

Q2 2017

Shares 177,360 Value ($000) $23,468 Avg Close $102.88 Range $96.18 - $110.06

Q1 2017

Shares 177,450 Value ($000) $21,567 Avg Close $87.85 Range $81.86 - $97.31

Q4 2016

Shares 178,077 Value ($000) $18,819 Avg Close $86.33 Range $79.20 - $93.79

Q3 2016

Shares 177,720 Value ($000) $20,141 Avg Close $90.38 Range $85.02 - $93.47

Q2 2016

Shares 177,810 Value ($000) $20,200 Avg Close $83.75 Range $79.73 - $89.81

Q1 2016

Shares 241,072 Value ($000) $24,678 Avg Close $73.16 Range $65.02 - $80.56

Q4 2015

Shares 190,972 Value ($000) $18,515 Avg Close $75.94 Range $67.91 - $81.06

Q3 2015

Shares 189,732 Value ($000) $16,692 Avg Close $72.97 Range $67.60 - $78.65

Q2 2015

Shares 212,499 Value ($000) $19,824 Avg Close $72.97 Range $70.92 - $75.72

Q1 2015

Shares 250,994 Value ($000) $23,631 Avg Close $74.63 Range $71.55 - $78.20

Q4 2014

Shares 261,424 Value ($000) $25,842 Avg Close $75.17 Range $68.98 - $81.29

Q3 2014

Shares 267,549 Value ($000) $25,051 Avg Close $72.53 Range $67.84 - $76.11

Q2 2014

Shares 269,569 Value ($000) $24,256 Avg Close $65.68 Range $60.55 - $68.85

Q1 2014

Shares 274,234 Value ($000) $22,452 Avg Close $61.59 Range $59.25 - $64.17

Q4 2013

Shares 285,742 Value ($000) $22,808 Avg Close $58.52 Range $53.88 - $61.27

Q3 2013

Shares 287,357 Value ($000) $21,302 Avg Close $54.19 Range $50.94 - $58.77

Q2 2013

Shares 283,012 Value ($000) $20,708 Avg Close $59.51 Range $52.17 - $63.74

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	79,208	$13,907	$180.30	$169.12 - $192.63
Q3 2025	81,078	$15,593	$204.56	$185.10 - $230.04
Q2 2025	82,633	$18,264	$210.37	$190.80 - $225.87
Q1 2025	85,463	$18,597	$189.52	$166.66 - $212.16
Q4 2024	87,051	$15,966	$198.35	$171.45 - $222.90
Q3 2024	88,309	$20,537	$210.79	$182.10 - $231.55
Q2 2024	89,732	$17,442	$176.27	$160.72 - $190.06
Q1 2024	104,227	$20,594	$186.13	$169.29 - $204.74
Q4 2023	105,561	$22,789	$175.15	$141.88 - $204.01
Q3 2023	107,586	$17,693	$167.65	$145.17 - $184.31
Q2 2023	110,446	$21,420	$178.08	$162.53 - $192.95
Q1 2023	112,043	$22,895	$189.59	$171.12 - $212.87
Q4 2022	113,631	$24,074	$186.71	$159.82 - $204.49
Q3 2022	118,261	$25,391	$228.80	$188.24 - $251.54
Q2 2022	119,951	$30,658	$222.20	$196.54 - $240.37
Q1 2022	120,166	$30,188	$214.86	$193.72 - $257.60
Q4 2021	125,326	$36,658	$239.48	$222.02 - $259.23
Q3 2021	139,371	$36,990	$248.67	$232.43 - $264.88
Q2 2021	140,332	$37,909	$221.28	$204.65 - $239.67
Q1 2021	140,226	$33,522	$192.28	$170.54 - $209.67
Q4 2020	151,016	$33,897	$199.71	$184.97 - $217.31
Q3 2020	152,446	$36,850	$216.72	$200.88 - $232.60
Q2 2020	155,335	$40,160	$210.56	$171.21 - $229.12
Q1 2020	156,205	$34,014	$197.22	$147.72 - $219.16
Q4 2019	159,360	$36,624	$183.82	$171.19 - $195.06
Q3 2019	159,327	$35,232	$183.38	$167.57 - $203.29
Q2 2019	159,863	$32,684	$168.17	$157.69 - $183.80
Q1 2019	159,808	$31,492	$146.03	$128.16 - $164.30
Q4 2018	163,558	$25,873	$129.50	$116.26 - $139.59
Q3 2018	167,450	$24,330	$120.79	$114.07 - $125.11
Q2 2018	168,144	$24,241	$113.83	$109.35 - $119.75
Q1 2018	172,044	$25,005	$114.77	$106.21 - $122.30
Q4 2017	175,779	$25,078	$115.75	$109.97 - $125.87
Q3 2017	177,360	$24,242	$112.31	$105.52 - $119.95
Q2 2017	177,360	$23,468	$102.88	$96.18 - $110.06
Q1 2017	177,450	$21,567	$87.85	$81.86 - $97.31
Q4 2016	178,077	$18,819	$86.33	$79.20 - $93.79
Q3 2016	177,720	$20,141	$90.38	$85.02 - $93.47
Q2 2016	177,810	$20,200	$83.75	$79.73 - $89.81
Q1 2016	241,072	$24,678	$73.16	$65.02 - $80.56
Q4 2015	190,972	$18,515	$75.94	$67.91 - $81.06
Q3 2015	189,732	$16,692	$72.97	$67.60 - $78.65
Q2 2015	212,499	$19,824	$72.97	$70.92 - $75.72
Q1 2015	250,994	$23,631	$74.63	$71.55 - $78.20
Q4 2014	261,424	$25,842	$75.17	$68.98 - $81.29
Q3 2014	267,549	$25,051	$72.53	$67.84 - $76.11
Q2 2014	269,569	$24,256	$65.68	$60.55 - $68.85
Q1 2014	274,234	$22,452	$61.59	$59.25 - $64.17
Q4 2013	285,742	$22,808	$58.52	$53.88 - $61.27
Q3 2013	287,357	$21,302	$54.19	$50.94 - $58.77
Q2 2013	283,012	$20,708	$59.51	$52.17 - $63.74