OMNICOM GROUP INC

Ticker: OMC CUSIP: 681919106 Class: COM

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

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

Q4 2025

Shares 14,781 Value ($000) $1,194 Avg Close $75.76 Range $69.18 - $82.39

Q3 2025

Shares 14,160 Value ($000) $1,154 Avg Close $74.34 Range $69.07 - $82.15

Q2 2025

Shares 22,182 Value ($000) $1,596 Avg Close $71.94 Range $67.10 - $80.64

Q1 2025

Shares 23,145 Value ($000) $1,919 Avg Close $80.64 Range $76.47 - $86.12

Q4 2024

Shares 23,195 Value ($000) $1,996 Avg Close $94.87 Range $81.50 - $102.31

Q3 2024

Shares 23,295 Value ($000) $2,408 Avg Close $91.35 Range $82.89 - $99.62

Q2 2024

Shares 19,370 Value ($000) $1,737 Avg Close $87.64 Range $83.07 - $92.41

Q1 2024

Shares 19,500 Value ($000) $1,887 Avg Close $84.10 Range $78.96 - $91.87

Q4 2023

Shares 14,440 Value ($000) $1,249 Avg Close $73.20 Range $66.98 - $82.23

Q3 2023

Shares 14,450 Value ($000) $1,076 Avg Close $75.86 Range $67.43 - $91.21

Q2 2023

Shares 14,750 Value ($000) $1,403 Avg Close $84.87 Range $76.72 - $89.36

Q1 2023

Shares 15,667 Value ($000) $1,478 Avg Close $80.37 Range $73.85 - $87.38

Q4 2022

Shares 15,167 Value ($000) $1,237 Avg Close $66.68 Range $55.85 - $74.45

Q3 2022

Shares 14,567 Value ($000) $919 Avg Close $60.29 Range $54.43 - $65.53

Q2 2022

Shares 14,567 Value ($000) $927 Avg Close $65.19 Range $54.75 - $76.93

Q1 2022

Shares 14,567 Value ($000) $1,135 Avg Close $70.18 Range $63.11 - $79.79

Q4 2021

Shares 14,617 Value ($000) $1,071 Avg Close $61.44 Range $56.73 - $66.97

Q3 2021

Shares 14,617 Value ($000) $1,059 Avg Close $63.56 Range $60.09 - $69.72

Q2 2021

Shares 14,717 Value ($000) $1,177 Avg Close $68.98 Range $62.74 - $73.18

Q1 2021

Shares 14,717 Value ($000) $1,120 Avg Close $58.12 Range $50.68 - $66.03

Q4 2020

Shares 14,717 Value ($000) $918 Avg Close $47.57 Range $36.97 - $54.67

Q3 2020

Shares 14,817 Value ($000) $733 Avg Close $44.01 Range $39.88 - $47.39

Q2 2020

Shares 14,490 Value ($000) $791 Avg Close $44.27 Range $37.85 - $51.94

Q1 2020

Shares 14,240 Value ($000) $782 Avg Close $57.15 Range $37.64 - $65.23

Q4 2019

Shares 30,713 Value ($000) $2,488 Avg Close $62.52 Range $57.82 - $65.94

Q3 2019

Shares 30,958 Value ($000) $2,424 Avg Close $62.85 Range $59.00 - $67.24

Q2 2019

Shares 31,158 Value ($000) $2,553 Avg Close $61.97 Range $57.20 - $66.14

Q1 2019

Shares 31,093 Value ($000) $2,269 Avg Close $58.50 Range $55.57 - $61.21

Q4 2018

Shares 30,973 Value ($000) $2,268 Avg Close $57.22 Range $51.46 - $60.20

Q3 2018

Shares 31,111 Value ($000) $2,116 Avg Close $53.66 Range $50.55 - $59.90

Q2 2018

Shares 31,578 Value ($000) $2,408 Avg Close $56.08 Range $52.42 - $59.08

Q1 2018

Shares 31,953 Value ($000) $2,322 Avg Close $56.50 Range $52.38 - $62.67

Q4 2017

Shares 30,947 Value ($000) $2,254 Avg Close $53.58 Range $48.73 - $58.71

Q3 2017

Shares 32,730 Value ($000) $2,424 Avg Close $57.11 Range $53.04 - $61.93

Q2 2017

Shares 31,287 Value ($000) $2,594 Avg Close $61.42 Range $58.73 - $63.77

Q1 2017

Shares 31,312 Value ($000) $2,699 Avg Close $62.46 Range $61.24 - $63.88

Q4 2016

Shares 31,427 Value ($000) $2,675 Avg Close $60.96 Range $57.12 - $65.10

Q3 2016

Shares 31,177 Value ($000) $2,650 Avg Close $60.52 Range $57.66 - $63.12

Q2 2016

Shares 31,662 Value ($000) $2,580 Avg Close $59.65 Range $54.54 - $61.60

Q1 2016

Shares 31,712 Value ($000) $2,639 Avg Close $53.77 Range $47.34 - $60.37

Q4 2015

Shares 32,062 Value ($000) $2,426 Avg Close $52.01 Range $45.58 - $55.24

Q3 2015

Shares 36,137 Value ($000) $2,381 Avg Close $49.25 Range $45.16 - $52.36

Q2 2015

Shares 36,137 Value ($000) $2,511 Avg Close $52.75 Range $48.47 - $55.29

Q1 2015

Shares 36,197 Value ($000) $2,823 Avg Close $53.02 Range $49.88 - $56.12

Q4 2014

Shares 36,332 Value ($000) $2,815 Avg Close $50.26 Range $44.08 - $54.31

Q3 2014

Shares 35,847 Value ($000) $2,468 Avg Close $48.82 Range $47.04 - $50.68

Q2 2014

Shares 36,757 Value ($000) $2,618 Avg Close $47.35 Range $44.41 - $49.44

Q1 2014

Shares 49,657 Value ($000) $3,605 Avg Close $49.73 Range $47.66 - $52.06

Q4 2013

Shares 50,287 Value ($000) $3,740 Avg Close $46.21 Range $41.19 - $50.30

Q3 2013

Shares 51,107 Value ($000) $3,242 Avg Close $42.52 Range $39.83 - $47.04

Q2 2013

Shares 51,167 Value ($000) $3,217 Avg Close $40.69 Range $38.27 - $42.87

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	14,781	$1,194	$75.76	$69.18 - $82.39
Q3 2025	14,160	$1,154	$74.34	$69.07 - $82.15
Q2 2025	22,182	$1,596	$71.94	$67.10 - $80.64
Q1 2025	23,145	$1,919	$80.64	$76.47 - $86.12
Q4 2024	23,195	$1,996	$94.87	$81.50 - $102.31
Q3 2024	23,295	$2,408	$91.35	$82.89 - $99.62
Q2 2024	19,370	$1,737	$87.64	$83.07 - $92.41
Q1 2024	19,500	$1,887	$84.10	$78.96 - $91.87
Q4 2023	14,440	$1,249	$73.20	$66.98 - $82.23
Q3 2023	14,450	$1,076	$75.86	$67.43 - $91.21
Q2 2023	14,750	$1,403	$84.87	$76.72 - $89.36
Q1 2023	15,667	$1,478	$80.37	$73.85 - $87.38
Q4 2022	15,167	$1,237	$66.68	$55.85 - $74.45
Q3 2022	14,567	$919	$60.29	$54.43 - $65.53
Q2 2022	14,567	$927	$65.19	$54.75 - $76.93
Q1 2022	14,567	$1,135	$70.18	$63.11 - $79.79
Q4 2021	14,617	$1,071	$61.44	$56.73 - $66.97
Q3 2021	14,617	$1,059	$63.56	$60.09 - $69.72
Q2 2021	14,717	$1,177	$68.98	$62.74 - $73.18
Q1 2021	14,717	$1,120	$58.12	$50.68 - $66.03
Q4 2020	14,717	$918	$47.57	$36.97 - $54.67
Q3 2020	14,817	$733	$44.01	$39.88 - $47.39
Q2 2020	14,490	$791	$44.27	$37.85 - $51.94
Q1 2020	14,240	$782	$57.15	$37.64 - $65.23
Q4 2019	30,713	$2,488	$62.52	$57.82 - $65.94
Q3 2019	30,958	$2,424	$62.85	$59.00 - $67.24
Q2 2019	31,158	$2,553	$61.97	$57.20 - $66.14
Q1 2019	31,093	$2,269	$58.50	$55.57 - $61.21
Q4 2018	30,973	$2,268	$57.22	$51.46 - $60.20
Q3 2018	31,111	$2,116	$53.66	$50.55 - $59.90
Q2 2018	31,578	$2,408	$56.08	$52.42 - $59.08
Q1 2018	31,953	$2,322	$56.50	$52.38 - $62.67
Q4 2017	30,947	$2,254	$53.58	$48.73 - $58.71
Q3 2017	32,730	$2,424	$57.11	$53.04 - $61.93
Q2 2017	31,287	$2,594	$61.42	$58.73 - $63.77
Q1 2017	31,312	$2,699	$62.46	$61.24 - $63.88
Q4 2016	31,427	$2,675	$60.96	$57.12 - $65.10
Q3 2016	31,177	$2,650	$60.52	$57.66 - $63.12
Q2 2016	31,662	$2,580	$59.65	$54.54 - $61.60
Q1 2016	31,712	$2,639	$53.77	$47.34 - $60.37
Q4 2015	32,062	$2,426	$52.01	$45.58 - $55.24
Q3 2015	36,137	$2,381	$49.25	$45.16 - $52.36
Q2 2015	36,137	$2,511	$52.75	$48.47 - $55.29
Q1 2015	36,197	$2,823	$53.02	$49.88 - $56.12
Q4 2014	36,332	$2,815	$50.26	$44.08 - $54.31
Q3 2014	35,847	$2,468	$48.82	$47.04 - $50.68
Q2 2014	36,757	$2,618	$47.35	$44.41 - $49.44
Q1 2014	49,657	$3,605	$49.73	$47.66 - $52.06
Q4 2013	50,287	$3,740	$46.21	$41.19 - $50.30
Q3 2013	51,107	$3,242	$42.52	$39.83 - $47.04
Q2 2013	51,167	$3,217	$40.69	$38.27 - $42.87