ECOLAB INC

Ticker: ECL CUSIP: 278865100 Class: COM

WELCH & FORBES LLC's Holding History (CIK: 0000105495)

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

Q4 2025

Shares 472,164 Value ($000) $123,952 Avg Close $265.71 Range $251.04 - $281.41

Q3 2025

Shares 473,582 Value ($000) $129,695 Avg Close $270.32 Range $253.71 - $284.56

Q2 2025

Shares 474,328 Value ($000) $127,803 Avg Close $252.35 Range $219.93 - $269.19

Q1 2025

Shares 471,715 Value ($000) $119,589 Avg Close $249.61 Range $225.31 - $270.90

Q4 2024

Shares 468,681 Value ($000) $109,821 Avg Close $245.53 Range $230.70 - $259.26

Q3 2024

Shares 472,455 Value ($000) $120,632 Avg Close $241.07 Range $217.65 - $253.31

Q2 2024

Shares 472,249 Value ($000) $113,943 Avg Close $227.14 Range $213.29 - $242.24

Q1 2024

Shares 470,607 Value ($000) $108,663 Avg Close $207.94 Range $189.63 - $227.85

Q4 2023

Shares 467,365 Value ($000) $92,702 Avg Close $175.85 Range $153.18 - $197.06

Q3 2023

Shares 462,403 Value ($000) $78,331 Avg Close $177.30 Range $163.22 - $186.52

Q2 2023

Shares 456,122 Value ($000) $85,154 Avg Close $167.31 Range $156.95 - $182.94

Q1 2023

Shares 455,410 Value ($000) $75,384 Avg Close $150.99 Range $139.35 - $161.29

Q4 2022

Shares 447,371 Value ($000) $65,119 Avg Close $141.81 Range $126.42 - $153.48

Q3 2022

Shares 457,905 Value ($000) $66,131 Avg Close $156.07 Range $138.29 - $171.23

Q2 2022

Shares 454,487 Value ($000) $69,882 Avg Close $158.99 Range $137.82 - $177.76

Q1 2022

Shares 443,645 Value ($000) $78,329 Avg Close $179.54 Range $147.91 - $226.74

Q4 2021

Shares 426,872 Value ($000) $100,140 Avg Close $215.53 Range $199.33 - $227.72

Q3 2021

Shares 421,323 Value ($000) $87,897 Avg Close $208.54 Range $195.25 - $219.93

Q2 2021

Shares 415,663 Value ($000) $85,614 Avg Close $206.33 Range $194.28 - $218.25

Q1 2021

Shares 410,273 Value ($000) $87,827 Avg Close $201.55 Range $190.45 - $215.84

Q4 2020

Shares 397,146 Value ($000) $85,927 Avg Close $197.47 Range $171.24 - $214.73

Q3 2020

Shares 398,373 Value ($000) $79,611 Avg Close $188.44 Range $172.53 - $201.15

Q2 2020

Shares 382,560 Value ($000) $76,111 Avg Close $182.16 Range $136.65 - $217.57

Q1 2020

Shares 382,413 Value ($000) $59,591 Avg Close $176.33 Range $117.17 - $198.13

Q4 2019

Shares 381,438 Value ($000) $73,614 Avg Close $177.67 Range $169.74 - $186.58

Q3 2019

Shares 381,068 Value ($000) $75,467 Avg Close $187.16 Range $179.22 - $195.89

Q2 2019

Shares 383,606 Value ($000) $75,739 Avg Close $173.21 Range $164.99 - $187.12

Q1 2019

Shares 388,946 Value ($000) $68,665 Avg Close $150.92 Range $131.24 - $169.66

Q4 2018

Shares 400,904 Value ($000) $59,074 Avg Close $141.48 Range $126.10 - $150.86

Q3 2018

Shares 399,537 Value ($000) $62,640 Avg Close $137.00 Range $128.06 - $148.09

Q2 2018

Shares 400,793 Value ($000) $56,243 Avg Close $132.91 Range $122.30 - $138.58

Q1 2018

Shares 399,909 Value ($000) $54,815 Avg Close $123.54 Range $115.47 - $129.02

Q4 2017

Shares 391,890 Value ($000) $52,584 Avg Close $121.85 Range $117.53 - $126.30

Q3 2017

Shares 394,064 Value ($000) $50,680 Avg Close $120.10 Range $116.11 - $122.59

Q2 2017

Shares 392,712 Value ($000) $52,132 Avg Close $117.68 Range $113.27 - $123.01

Q1 2017

Shares 387,343 Value ($000) $48,550 Avg Close $111.04 Range $106.47 - $114.69

Q4 2016

Shares 380,027 Value ($000) $44,546 Avg Close $105.98 Range $100.13 - $110.74

Q3 2016

Shares 374,856 Value ($000) $45,628 Avg Close $108.98 Range $105.46 - $112.42

Q2 2016

Shares 385,064 Value ($000) $45,669 Avg Close $104.92 Range $98.81 - $109.58

Q1 2016

Shares 381,592 Value ($000) $42,555 Avg Close $95.34 Range $88.43 - $102.02

Q4 2015

Shares 361,944 Value ($000) $41,399 Avg Close $105.21 Range $98.01 - $109.49

Q3 2015

Shares 358,917 Value ($000) $39,380 Avg Close $99.79 Range $91.88 - $104.89

Q2 2015

Shares 352,653 Value ($000) $39,874 Avg Close $102.25 Range $97.79 - $105.41

Q1 2015

Shares 357,274 Value ($000) $40,865 Avg Close $97.19 Range $86.65 - $103.73

Q4 2014

Shares 358,713 Value ($000) $37,493 Avg Close $96.70 Range $89.74 - $101.94

Q3 2014

Shares 357,442 Value ($000) $41,045 Avg Close $99.26 Range $94.57 - $104.65

Q2 2014

Shares 356,610 Value ($000) $39,705 Avg Close $94.25 Range $89.51 - $98.33

Q1 2014

Shares 360,647 Value ($000) $38,946 Avg Close $91.92 Range $85.62 - $98.30

Q4 2013

Shares 365,773 Value ($000) $38,138 Avg Close $90.95 Range $84.34 - $94.74

Q3 2013

Shares 383,099 Value ($000) $37,836 Avg Close $81.20 Range $74.57 - $86.97

Q2 2013

Shares 390,662 Value ($000) $33,280 Avg Close $73.48 Range $68.51 - $77.84

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	472,164	$123,952	$265.71	$251.04 - $281.41
Q3 2025	473,582	$129,695	$270.32	$253.71 - $284.56
Q2 2025	474,328	$127,803	$252.35	$219.93 - $269.19
Q1 2025	471,715	$119,589	$249.61	$225.31 - $270.90
Q4 2024	468,681	$109,821	$245.53	$230.70 - $259.26
Q3 2024	472,455	$120,632	$241.07	$217.65 - $253.31
Q2 2024	472,249	$113,943	$227.14	$213.29 - $242.24
Q1 2024	470,607	$108,663	$207.94	$189.63 - $227.85
Q4 2023	467,365	$92,702	$175.85	$153.18 - $197.06
Q3 2023	462,403	$78,331	$177.30	$163.22 - $186.52
Q2 2023	456,122	$85,154	$167.31	$156.95 - $182.94
Q1 2023	455,410	$75,384	$150.99	$139.35 - $161.29
Q4 2022	447,371	$65,119	$141.81	$126.42 - $153.48
Q3 2022	457,905	$66,131	$156.07	$138.29 - $171.23
Q2 2022	454,487	$69,882	$158.99	$137.82 - $177.76
Q1 2022	443,645	$78,329	$179.54	$147.91 - $226.74
Q4 2021	426,872	$100,140	$215.53	$199.33 - $227.72
Q3 2021	421,323	$87,897	$208.54	$195.25 - $219.93
Q2 2021	415,663	$85,614	$206.33	$194.28 - $218.25
Q1 2021	410,273	$87,827	$201.55	$190.45 - $215.84
Q4 2020	397,146	$85,927	$197.47	$171.24 - $214.73
Q3 2020	398,373	$79,611	$188.44	$172.53 - $201.15
Q2 2020	382,560	$76,111	$182.16	$136.65 - $217.57
Q1 2020	382,413	$59,591	$176.33	$117.17 - $198.13
Q4 2019	381,438	$73,614	$177.67	$169.74 - $186.58
Q3 2019	381,068	$75,467	$187.16	$179.22 - $195.89
Q2 2019	383,606	$75,739	$173.21	$164.99 - $187.12
Q1 2019	388,946	$68,665	$150.92	$131.24 - $169.66
Q4 2018	400,904	$59,074	$141.48	$126.10 - $150.86
Q3 2018	399,537	$62,640	$137.00	$128.06 - $148.09
Q2 2018	400,793	$56,243	$132.91	$122.30 - $138.58
Q1 2018	399,909	$54,815	$123.54	$115.47 - $129.02
Q4 2017	391,890	$52,584	$121.85	$117.53 - $126.30
Q3 2017	394,064	$50,680	$120.10	$116.11 - $122.59
Q2 2017	392,712	$52,132	$117.68	$113.27 - $123.01
Q1 2017	387,343	$48,550	$111.04	$106.47 - $114.69
Q4 2016	380,027	$44,546	$105.98	$100.13 - $110.74
Q3 2016	374,856	$45,628	$108.98	$105.46 - $112.42
Q2 2016	385,064	$45,669	$104.92	$98.81 - $109.58
Q1 2016	381,592	$42,555	$95.34	$88.43 - $102.02
Q4 2015	361,944	$41,399	$105.21	$98.01 - $109.49
Q3 2015	358,917	$39,380	$99.79	$91.88 - $104.89
Q2 2015	352,653	$39,874	$102.25	$97.79 - $105.41
Q1 2015	357,274	$40,865	$97.19	$86.65 - $103.73
Q4 2014	358,713	$37,493	$96.70	$89.74 - $101.94
Q3 2014	357,442	$41,045	$99.26	$94.57 - $104.65
Q2 2014	356,610	$39,705	$94.25	$89.51 - $98.33
Q1 2014	360,647	$38,946	$91.92	$85.62 - $98.30
Q4 2013	365,773	$38,138	$90.95	$84.34 - $94.74
Q3 2013	383,099	$37,836	$81.20	$74.57 - $86.97
Q2 2013	390,662	$33,280	$73.48	$68.51 - $77.84