THERMO FISHER SCIENTIFIC INC

Ticker: TMO CUSIP: 883556102 Class: COM

Chesley Taft & Associates LLC's Holding History (CIK: 0001164632)

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

Q4 2025

Shares 42,442 Value ($000) $24,593 Avg Close $565.16 Range $486.57 - $601.87

Q3 2025

Shares 40,973 Value ($000) $19,873 Avg Close $464.78 Range $402.70 - $501.56

Q2 2025

Shares 41,467 Value ($000) $16,813 Avg Close $417.06 Range $384.82 - $495.18

Q1 2025

Shares 41,768 Value ($000) $20,784 Avg Close $539.78 Range $482.97 - $608.82

Q4 2024

Shares 39,946 Value ($000) $20,781 Avg Close $547.53 Range $491.20 - $617.36

Q3 2024

Shares 40,071 Value ($000) $24,787 Avg Close $589.13 Range $525.78 - $624.81

Q2 2024

Shares 40,041 Value ($000) $22,143 Avg Close $569.75 Range $526.69 - $598.64

Q1 2024

Shares 39,459 Value ($000) $22,934 Avg Close $557.71 Range $524.04 - $600.06

Q4 2023

Shares 39,439 Value ($000) $20,934 Avg Close $480.76 Range $412.73 - $532.66

Q3 2023

Shares 39,642 Value ($000) $20,066 Avg Close $528.90 Range $491.51 - $575.69

Q2 2023

Shares 40,512 Value ($000) $21,137 Avg Close $535.25 Range $494.39 - $588.28

Q1 2023

Shares 40,798 Value ($000) $23,515 Avg Close $558.70 Range $518.14 - $604.43

Q4 2022

Shares 41,116 Value ($000) $22,642 Avg Close $524.96 Range $471.30 - $579.21

Q3 2022

Shares 41,411 Value ($000) $21,003 Avg Close $554.13 Range $500.83 - $604.99

Q2 2022

Shares 41,547 Value ($000) $22,572 Avg Close $544.70 Range $492.89 - $611.86

Q1 2022

Shares 42,802 Value ($000) $24,437 Avg Close $568.16 Range $508.25 - $656.92

Q4 2021

Shares 43,576 Value ($000) $29,076 Avg Close $617.25 Range $545.68 - $664.90

Q3 2021

Shares 44,127 Value ($000) $25,211 Avg Close $542.36 Range $497.26 - $609.86

Q2 2021

Shares 44,269 Value ($000) $22,332 Avg Close $466.00 Range $433.25 - $504.51

Q1 2021

Shares 45,395 Value ($000) $21,126 Avg Close $471.13 Range $427.86 - $519.72

Q4 2020

Shares 45,856 Value ($000) $21,359 Avg Close $462.59 Range $427.16 - $525.38

Q3 2020

Shares 48,412 Value ($000) $21,375 Avg Close $407.40 Range $352.00 - $438.79

Q2 2020

Shares 48,960 Value ($000) $17,740 Avg Close $330.32 Range $266.44 - $358.87

Q1 2020

Shares 51,178 Value ($000) $14,514 Avg Close $310.51 Range $246.54 - $336.98

Q4 2019

Shares 51,489 Value ($000) $16,727 Avg Close $298.40 Range $266.00 - $325.05

Q3 2019

Shares 52,032 Value ($000) $15,155 Avg Close $281.62 Range $262.06 - $300.37

Q2 2019

Shares 52,434 Value ($000) $15,399 Avg Close $270.70 Range $248.84 - $293.42

Q1 2019

Shares 52,156 Value ($000) $14,276 Avg Close $244.42 Range $206.29 - $269.21

Q4 2018

Shares 54,661 Value ($000) $12,233 Avg Close $230.26 Range $204.59 - $249.16

Q3 2018

Shares 55,736 Value ($000) $13,604 Avg Close $225.62 Range $199.95 - $240.42

Q2 2018

Shares 55,431 Value ($000) $11,482 Avg Close $208.02 Range $195.82 - $217.41

Q1 2018

Shares 56,641 Value ($000) $11,694 Avg Close $205.54 Range $186.40 - $221.70

Q4 2017

Shares 57,231 Value ($000) $10,867 Avg Close $187.44 Range $177.57 - $196.84

Q3 2017

Shares 57,109 Value ($000) $10,805 Avg Close $177.07 Range $166.25 - $189.94

Q2 2017

Shares 52,942 Value ($000) $9,237 Avg Close $164.09 Range $148.20 - $172.95

Q1 2017

Shares 53,707 Value ($000) $8,249 Avg Close $149.18 Range $136.61 - $157.89

Q4 2016

Shares 55,462 Value ($000) $7,826 Avg Close $143.74 Range $135.56 - $156.06

Q3 2016

Shares 54,772 Value ($000) $8,712 Avg Close $150.09 Range $139.26 - $156.47

Q2 2016

Shares 55,972 Value ($000) $8,270 Avg Close $143.61 Range $136.38 - $150.60

Q1 2016

Shares 56,015 Value ($000) $7,931 Avg Close $130.26 Range $116.37 - $138.34

Q4 2015

Shares 56,693 Value ($000) $8,042 Avg Close $129.50 Range $116.40 - $139.59

Q3 2015

Shares 61,310 Value ($000) $7,497 Avg Close $126.34 Range $113.67 - $136.94

Q2 2015

Shares 61,370 Value ($000) $7,963 Avg Close $126.27 Range $121.29 - $130.90

Q1 2015

Shares 61,415 Value ($000) $8,250 Avg Close $124.72 Range $117.56 - $134.63

Q4 2014

Shares 65,110 Value ($000) $8,158 Avg Close $117.50 Range $103.69 - $125.37

Q3 2014

Shares 64,645 Value ($000) $7,867 Avg Close $117.35 Range $112.28 - $122.75

Q2 2014

Shares 65,015 Value ($000) $7,672 Avg Close $113.45 Range $107.95 - $118.89

Q1 2014

Shares 64,495 Value ($000) $7,755 Avg Close $114.47 Range $105.00 - $122.85

Q4 2013

Shares 60,875 Value ($000) $6,778 Avg Close $95.60 Range $86.22 - $107.27

Q3 2013

Shares 61,065 Value ($000) $5,627 Avg Close $86.81 Range $81.00 - $91.06

Q2 2013

Shares 60,990 Value ($000) $5,162 Avg Close $79.76 Range $72.10 - $85.73

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	42,442	$24,593	$565.16	$486.57 - $601.87
Q3 2025	40,973	$19,873	$464.78	$402.70 - $501.56
Q2 2025	41,467	$16,813	$417.06	$384.82 - $495.18
Q1 2025	41,768	$20,784	$539.78	$482.97 - $608.82
Q4 2024	39,946	$20,781	$547.53	$491.20 - $617.36
Q3 2024	40,071	$24,787	$589.13	$525.78 - $624.81
Q2 2024	40,041	$22,143	$569.75	$526.69 - $598.64
Q1 2024	39,459	$22,934	$557.71	$524.04 - $600.06
Q4 2023	39,439	$20,934	$480.76	$412.73 - $532.66
Q3 2023	39,642	$20,066	$528.90	$491.51 - $575.69
Q2 2023	40,512	$21,137	$535.25	$494.39 - $588.28
Q1 2023	40,798	$23,515	$558.70	$518.14 - $604.43
Q4 2022	41,116	$22,642	$524.96	$471.30 - $579.21
Q3 2022	41,411	$21,003	$554.13	$500.83 - $604.99
Q2 2022	41,547	$22,572	$544.70	$492.89 - $611.86
Q1 2022	42,802	$24,437	$568.16	$508.25 - $656.92
Q4 2021	43,576	$29,076	$617.25	$545.68 - $664.90
Q3 2021	44,127	$25,211	$542.36	$497.26 - $609.86
Q2 2021	44,269	$22,332	$466.00	$433.25 - $504.51
Q1 2021	45,395	$21,126	$471.13	$427.86 - $519.72
Q4 2020	45,856	$21,359	$462.59	$427.16 - $525.38
Q3 2020	48,412	$21,375	$407.40	$352.00 - $438.79
Q2 2020	48,960	$17,740	$330.32	$266.44 - $358.87
Q1 2020	51,178	$14,514	$310.51	$246.54 - $336.98
Q4 2019	51,489	$16,727	$298.40	$266.00 - $325.05
Q3 2019	52,032	$15,155	$281.62	$262.06 - $300.37
Q2 2019	52,434	$15,399	$270.70	$248.84 - $293.42
Q1 2019	52,156	$14,276	$244.42	$206.29 - $269.21
Q4 2018	54,661	$12,233	$230.26	$204.59 - $249.16
Q3 2018	55,736	$13,604	$225.62	$199.95 - $240.42
Q2 2018	55,431	$11,482	$208.02	$195.82 - $217.41
Q1 2018	56,641	$11,694	$205.54	$186.40 - $221.70
Q4 2017	57,231	$10,867	$187.44	$177.57 - $196.84
Q3 2017	57,109	$10,805	$177.07	$166.25 - $189.94
Q2 2017	52,942	$9,237	$164.09	$148.20 - $172.95
Q1 2017	53,707	$8,249	$149.18	$136.61 - $157.89
Q4 2016	55,462	$7,826	$143.74	$135.56 - $156.06
Q3 2016	54,772	$8,712	$150.09	$139.26 - $156.47
Q2 2016	55,972	$8,270	$143.61	$136.38 - $150.60
Q1 2016	56,015	$7,931	$130.26	$116.37 - $138.34
Q4 2015	56,693	$8,042	$129.50	$116.40 - $139.59
Q3 2015	61,310	$7,497	$126.34	$113.67 - $136.94
Q2 2015	61,370	$7,963	$126.27	$121.29 - $130.90
Q1 2015	61,415	$8,250	$124.72	$117.56 - $134.63
Q4 2014	65,110	$8,158	$117.50	$103.69 - $125.37
Q3 2014	64,645	$7,867	$117.35	$112.28 - $122.75
Q2 2014	65,015	$7,672	$113.45	$107.95 - $118.89
Q1 2014	64,495	$7,755	$114.47	$105.00 - $122.85
Q4 2013	60,875	$6,778	$95.60	$86.22 - $107.27
Q3 2013	61,065	$5,627	$86.81	$81.00 - $91.06
Q2 2013	60,990	$5,162	$79.76	$72.10 - $85.73