AMERICAN TOWER CORP NEW

Ticker: AMT CUSIP: 03027X100 Class: COM

BLAIR WILLIAM & CO/IL's Holding History (CIK: 0000902367)

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

Q4 2025

Shares 678,244 Value ($000) $119,079 Avg Close $180.30 Range $169.12 - $192.63

Q3 2025

Shares 782,048 Value ($000) $150,404 Avg Close $204.56 Range $185.10 - $230.04

Q2 2025

Shares 773,174 Value ($000) $170,887 Avg Close $210.37 Range $190.80 - $225.87

Q1 2025

Shares 777,189 Value ($000) $169,116 Avg Close $189.52 Range $166.66 - $212.16

Q4 2024

Shares 790,497 Value ($000) $144,985 Avg Close $198.35 Range $171.45 - $222.90

Q3 2024

Shares 796,005 Value ($000) $185,119 Avg Close $210.79 Range $182.10 - $231.55

Q2 2024

Shares 774,615 Value ($000) $150,570 Avg Close $176.27 Range $160.72 - $190.06

Q1 2024

Shares 761,357 Value ($000) $150,436 Avg Close $186.13 Range $169.29 - $204.74

Q4 2023

Shares 704,192 Value ($000) $152,021 Avg Close $175.15 Range $141.88 - $204.01

Q3 2023

Shares 677,146 Value ($000) $111,357 Avg Close $167.65 Range $145.17 - $184.31

Q2 2023

Shares 736,886 Value ($000) $142,912 Avg Close $178.08 Range $162.53 - $192.95

Q1 2023

Shares 711,224 Value ($000) $145,332 Avg Close $189.59 Range $171.12 - $212.87

Q4 2022

Shares 713,714 Value ($000) $151,208 Avg Close $186.71 Range $159.82 - $204.49

Q3 2022

Shares 730,748 Value ($000) $156,892 Avg Close $228.80 Range $188.24 - $251.54

Q2 2022

Shares 734,843 Value ($000) $187,818 Avg Close $222.20 Range $196.54 - $240.37

Q1 2022

Shares 734,131 Value ($000) $184,429 Avg Close $214.86 Range $193.72 - $257.60

Q4 2021

Shares 740,333 Value ($000) $216,548 Avg Close $239.48 Range $222.02 - $259.23

Q3 2021

Shares 728,999 Value ($000) $193,484 Avg Close $248.67 Range $232.43 - $264.88

Q2 2021

Shares 715,099 Value ($000) $193,177 Avg Close $221.28 Range $204.65 - $239.67

Q1 2021

Shares 707,634 Value ($000) $169,167 Avg Close $192.28 Range $170.54 - $209.67

Q4 2020

Shares 672,703 Value ($000) $150,995 Avg Close $199.71 Range $184.97 - $217.31

Q3 2020

Shares 646,749 Value ($000) $156,339 Avg Close $216.72 Range $200.88 - $232.60

Q2 2020

Shares 644,210 Value ($000) $166,554 Avg Close $210.56 Range $171.21 - $229.12

Q1 2020

Shares 626,669 Value ($000) $136,457 Avg Close $197.22 Range $147.72 - $219.16

Q4 2019

Shares 614,597 Value ($000) $141,247 Avg Close $183.82 Range $171.19 - $195.06

Q3 2019

Shares 610,150 Value ($000) $134,923 Avg Close $183.38 Range $167.57 - $203.29

Q2 2019

Shares 602,504 Value ($000) $123,182 Avg Close $168.17 Range $157.69 - $183.80

Q1 2019

Shares 558,141 Value ($000) $109,987 Avg Close $146.03 Range $128.16 - $164.30

Q4 2018

Shares 524,812 Value ($000) $83,020 Avg Close $129.50 Range $116.26 - $139.59

Q3 2018

Shares 506,554 Value ($000) $73,602 Avg Close $120.79 Range $114.07 - $125.11

Q2 2018

Shares 471,993 Value ($000) $68,047 Avg Close $113.83 Range $109.35 - $119.75

Q1 2018

Shares 466,493 Value ($000) $67,800 Avg Close $114.77 Range $106.21 - $122.30

Q4 2017

Shares 453,610 Value ($000) $64,717 Avg Close $115.75 Range $109.97 - $125.87

Q3 2017

Shares 444,908 Value ($000) $60,810 Avg Close $112.31 Range $105.52 - $119.95

Q2 2017

Shares 427,140 Value ($000) $56,519 Avg Close $102.88 Range $96.18 - $110.06

Q1 2017

Shares 423,833 Value ($000) $50,719 Avg Close $87.85 Range $81.86 - $97.31

Q4 2016

Shares 413,037 Value ($000) $43,650 Avg Close $86.33 Range $79.20 - $93.79

Q3 2016

Shares 411,559 Value ($000) $46,642 Avg Close $90.38 Range $85.02 - $93.47

Q2 2016

Shares 387,324 Value ($000) $44,004 Avg Close $83.75 Range $79.73 - $89.81

Q1 2016

Shares 310,570 Value ($000) $31,792 Avg Close $73.16 Range $65.02 - $80.56

Q4 2015

Shares 84,134 Value ($000) $8,157 Avg Close $75.94 Range $67.91 - $81.06

Q3 2015

Shares 69,256 Value ($000) $6,092 Avg Close $72.97 Range $67.60 - $78.65

Q2 2015

Shares 67,141 Value ($000) $6,263 Avg Close $72.97 Range $70.92 - $75.72

Q1 2015

Shares 67,381 Value ($000) $6,343 Avg Close $74.63 Range $71.55 - $78.20

Q4 2014

Shares 63,570 Value ($000) $6,283 Avg Close $75.17 Range $68.98 - $81.29

Q3 2014

Shares 59,494 Value ($000) $5,570 Avg Close $72.53 Range $67.84 - $76.11

Q2 2014

Shares 59,411 Value ($000) $5,345 Avg Close $65.68 Range $60.55 - $68.85

Q1 2014

Shares 50,064 Value ($000) $4,099 Avg Close $61.59 Range $59.25 - $64.17

Q4 2013

Shares 42,564 Value ($000) $3,397 Avg Close $58.52 Range $53.88 - $61.27

Q3 2013

Shares 23,998 Value ($000) $1,778 Avg Close $54.19 Range $50.94 - $58.77

Q2 2013

Shares 49,629 Value ($000) $3,631 Avg Close $59.51 Range $52.17 - $63.74

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	678,244	$119,079	$180.30	$169.12 - $192.63
Q3 2025	782,048	$150,404	$204.56	$185.10 - $230.04
Q2 2025	773,174	$170,887	$210.37	$190.80 - $225.87
Q1 2025	777,189	$169,116	$189.52	$166.66 - $212.16
Q4 2024	790,497	$144,985	$198.35	$171.45 - $222.90
Q3 2024	796,005	$185,119	$210.79	$182.10 - $231.55
Q2 2024	774,615	$150,570	$176.27	$160.72 - $190.06
Q1 2024	761,357	$150,436	$186.13	$169.29 - $204.74
Q4 2023	704,192	$152,021	$175.15	$141.88 - $204.01
Q3 2023	677,146	$111,357	$167.65	$145.17 - $184.31
Q2 2023	736,886	$142,912	$178.08	$162.53 - $192.95
Q1 2023	711,224	$145,332	$189.59	$171.12 - $212.87
Q4 2022	713,714	$151,208	$186.71	$159.82 - $204.49
Q3 2022	730,748	$156,892	$228.80	$188.24 - $251.54
Q2 2022	734,843	$187,818	$222.20	$196.54 - $240.37
Q1 2022	734,131	$184,429	$214.86	$193.72 - $257.60
Q4 2021	740,333	$216,548	$239.48	$222.02 - $259.23
Q3 2021	728,999	$193,484	$248.67	$232.43 - $264.88
Q2 2021	715,099	$193,177	$221.28	$204.65 - $239.67
Q1 2021	707,634	$169,167	$192.28	$170.54 - $209.67
Q4 2020	672,703	$150,995	$199.71	$184.97 - $217.31
Q3 2020	646,749	$156,339	$216.72	$200.88 - $232.60
Q2 2020	644,210	$166,554	$210.56	$171.21 - $229.12
Q1 2020	626,669	$136,457	$197.22	$147.72 - $219.16
Q4 2019	614,597	$141,247	$183.82	$171.19 - $195.06
Q3 2019	610,150	$134,923	$183.38	$167.57 - $203.29
Q2 2019	602,504	$123,182	$168.17	$157.69 - $183.80
Q1 2019	558,141	$109,987	$146.03	$128.16 - $164.30
Q4 2018	524,812	$83,020	$129.50	$116.26 - $139.59
Q3 2018	506,554	$73,602	$120.79	$114.07 - $125.11
Q2 2018	471,993	$68,047	$113.83	$109.35 - $119.75
Q1 2018	466,493	$67,800	$114.77	$106.21 - $122.30
Q4 2017	453,610	$64,717	$115.75	$109.97 - $125.87
Q3 2017	444,908	$60,810	$112.31	$105.52 - $119.95
Q2 2017	427,140	$56,519	$102.88	$96.18 - $110.06
Q1 2017	423,833	$50,719	$87.85	$81.86 - $97.31
Q4 2016	413,037	$43,650	$86.33	$79.20 - $93.79
Q3 2016	411,559	$46,642	$90.38	$85.02 - $93.47
Q2 2016	387,324	$44,004	$83.75	$79.73 - $89.81
Q1 2016	310,570	$31,792	$73.16	$65.02 - $80.56
Q4 2015	84,134	$8,157	$75.94	$67.91 - $81.06
Q3 2015	69,256	$6,092	$72.97	$67.60 - $78.65
Q2 2015	67,141	$6,263	$72.97	$70.92 - $75.72
Q1 2015	67,381	$6,343	$74.63	$71.55 - $78.20
Q4 2014	63,570	$6,283	$75.17	$68.98 - $81.29
Q3 2014	59,494	$5,570	$72.53	$67.84 - $76.11
Q2 2014	59,411	$5,345	$65.68	$60.55 - $68.85
Q1 2014	50,064	$4,099	$61.59	$59.25 - $64.17
Q4 2013	42,564	$3,397	$58.52	$53.88 - $61.27
Q3 2013	23,998	$1,778	$54.19	$50.94 - $58.77
Q2 2013	49,629	$3,631	$59.51	$52.17 - $63.74