Omnicom Group Inc.
US ˙ NYSE ˙ US6819191064

SecurityOMC / Omnicom Group Inc.
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership3,978,658 shares
Latest Disclosed Value $ 299,645,481
Dimensional Fund Advisors Lp reports 17.47% decrease in ownership of OMC / Omnicom Group Inc.

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 3,978,658 shares of Omnicom Group Inc. (US:OMC) valued at $299,632,734 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 4,820,978 shares of Omnicom Group Inc.. This represents a change in shares of -17.47% during the quarter. The current value of the position is $299,632,734 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-07 2026-03-31 13F OMNICOM GROUP COM 681919106 3,978,658 -842,320 -17.47 299,645 -23.03 0.0622
2026-02-12 2025-12-31 13F OMNICOM GROUP COM 681919106 4,820,978 2,233,717 86.34 389,291 84.60 0.0817
2025-11-12 2025-09-30 13F OMNICOM GROUP COM 681919106 2,587,261 -273,822 -9.57 210,889 2.46 0.0453
2025-08-12 2025-06-30 13F OMNICOM GROUP COM 681919106 2,861,083 -320,342 -10.07 205,821 -21.95 0.0477
2025-05-13 2025-03-31 13F OMNICOM GROUP COM 681919106 3,181,425 279,265 9.62 263,700 5.61 0.0655
2025-02-13 2024-12-31 13F OMNICOM GROUP COM 681919106 2,902,160 248,149 9.35 249,703 -9.00 0.0600
2024-11-07 2024-09-30 13F OMNICOM GROUP COM 681919106 2,654,011 360,916 15.74 274,385 33.40 0.0666
2024-08-09 2024-06-30 13F OMNICOM GROUP COM 681919106 2,293,095 364,665 18.91 205,682 10.23 0.0537
2024-05-10 2024-03-31 13F OMNICOM GROUP COM 681919106 1,928,430 72,551 3.91 186,595 16.22 0.0505
2024-02-07 2023-12-31 13F OMNICOM GROUP COM 681919106 1,855,879 78,215 4.40 160,557 21.27 0.0469
2023-11-09 2023-09-30 13F OMNICOM GROUP COM 681919106 1,777,664 -32,064 -1.77 132,399 -23.11 0.0434
2023-08-09 2023-06-30 13F OMNICOM GROUP COM 681919106 1,809,728 19,441 1.09 172,185 1.96 0.0549
2023-05-12 2023-03-31 13F OMNICOM GROUP COM 681919106 1,790,287 -9,133 -0.51 168,872 115,565.07 0.0569
2023-02-09 2022-12-31 13F OMNICOM GROUP COM 681919106 1,799,420 -174,756 -8.85 147 -99.88 0.0434
2022-11-10 2022-09-30 13F OMNICOM GROUP COM 681919106 1,974,176 8,546 0.43 124,561 -0.36 0.0478
2022-08-12 2022-06-30 13F OMNICOM GROUP COM 681919106 1,965,630 13,942 0.71 125,014 -24.55 0.0448
2022-05-13 2022-03-31 13F OMNICOM GROUP COM 681919106 1,951,688 -17,092 -0.87 165,686 14.85 0.0510
2022-02-09 2021-12-31 13F OMNICOM GROUP COM 681919106 1,968,780 -23,161 -1.16 144,258 -0.07 0.0436
2021-11-12 2021-09-30 13F OMNICOM GROUP COM 681919106 1,991,941 81,081 4.24 144,352 -5.55 0.0465
2021-08-12 2021-06-30 13F OMNICOM GROUP COM 681919106 1,910,860 87,148 4.78 152,835 13.01 0.0484
2021-05-14 2021-03-31 13F OMNICOM GROUP COM 681919106 1,823,712 162,620 9.79 135,246 30.55 0.0447
2021-03-08 2020-12-31 13F/A-2 OMNICOM GROUP COM 681919106 1,661,092 127,796 8.33 103,597 36.52 0.0374
2021-02-11 2020-12-31 13F OMNICOM GROUP COM 681919106 1,661,092 127,796 103,597 37,413.7299
2020-11-12 2020-09-30 13F OMNICOM GROUP COM 681919106 1,533,296 -17,149 -1.11 75,884 -10.36 0.0322
2020-08-13 2020-06-30 13F OMNICOM GROUP COM 681919106 1,550,445 45,226 3.00 84,650 2.44 0.0372
2020-05-14 2020-03-31 13F OMNICOM GROUP COM 681919106 1,505,219 116,044 8.35 82,635 -26.58 0.0431
2020-02-14 2019-12-31 13F OMNICOM GROUP COM 681919106 1,389,175 11,924 0.87 112,550 4.37 0.0410
2019-11-12 2019-09-30 13F OMNICOM GROUP COM 681919106 1,377,251 20,219 1.49 107,836 -3.03 0.0419
2019-08-13 2019-06-30 13F OMNICOM GROUP COM 681919106 1,357,032 34,454 2.61 111,203 15.19 0.0432
2019-08-12 2019-03-31 13F/A-2 OMNICOM GROUP COM 681919106 1,322,578 88,997 7.21 96,538 6.86 0.0384
2019-05-10 2019-03-31 13F OMNICOM GROUP COM 681919106 1,322,578 88,997 96,538
2019-02-26 2018-12-31 13F/A-1 OMNICOM GROUP COM 681919106 1,233,581 103,138 9.12 90,344 17.49 0.0409
2019-02-13 2018-12-31 13F OMNICOM GROUP COM 681919106 1,233,581 103,138 90,344
2018-11-13 2018-09-30 13F OMNICOM GROUP COM 681919106 1,130,443 42,284 3.89 76,894 -7.35 0.0293
2018-08-10 2018-06-30 13F OMNICOM GROUP COM 681919106 1,088,159 73,783 7.27 82,995 12.59 0.0331
2018-05-11 2018-03-31 13F OMNICOM GROUP COM 681919106 1,014,376 86,472 9.32 73,715 9.07 0.0307
2018-02-12 2017-12-31 13F OMNICOM GROUP COM 681919106 927,904 8,906 0.97 67,583 -0.72 0.0280
2017-11-13 2017-09-30 13F OMNICOM GROUP COM 681919106 918,998 21,846 2.44 68,071 -8.48 0.0297
2017-08-11 2017-06-30 13F OMNICOM GROUP COM 681919106 897,152 128,667 16.74 74,377 12.27 0.0343
2017-05-12 2017-03-31 13F OMNICOM GROUP COM 681919106 768,485 9,503 1.25 66,249 2.55 0.0317
2017-02-09 2016-12-31 13F OMNICOM GROUP COM 681919106 758,982 -6,581 -0.86 64,601 -0.72 0.0323
2016-11-10 2016-09-30 13F OMNICOM GROUP COM 681919106 765,563 -17,279 -2.21 65,069 2.01 0.0352
2016-08-09 2016-06-30 13F OMNICOM GROUP COM 681919106 782,842 -879 -0.11 63,788 -2.21 0.0367
2016-05-13 2016-03-31 13F OMNICOM GROUP COM 681919106 783,721 3,389 0.43 65,229 10.47 0.0390
2016-02-10 2015-12-31 13F OMNICOM GROUP COM 681919106 780,332 19,650 2.58 59,045 17.79 0.0368
2015-11-13 2015-09-30 13F OMNICOM GROUP COM 681919106 760,682 29,527 4.04 50,127 -1.34 0.0329
2015-08-14 2015-06-30 13F OMNICOM GROUP COM 681919106 731,155 61,897 9.25 50,808 -2.64 0.0311
2015-05-14 2015-03-31 13F OMNICOM GROUP COM 681919106 669,258 94,605 16.46 52,187 17.22 0.0330
2015-02-06 2014-12-31 13F OMNICOM GROUP COM 681919106 574,653 56,699 10.95 44,520 24.82 0.0292
2014-11-13 2014-09-30 13F OMNICOM GROUP COM 681919106 517,954 212,167 69.38 35,668 63.77 0.0253
2014-08-08 2014-06-30 13F OMNICOM GROUP COM 681919106 305,787 15,012 5.16 21,779 3.17 0.0151
2014-05-14 2014-03-31 13F OMNICOM GROUP COM 681919106 290,775 760 0.26 21,110 -2.12 0.0158
2014-02-12 2013-12-31 13F OMNICOM GROUP COM 681919106 290,015 -1,188 -0.41 21,567 16.74 0.0168
2013-11-13 2013-09-30 13F OMNICOM GROUP COM 681919106 291,203 5,250 1.84 18,475 2.76 0.0160
2013-08-15 2013-06-30 13F OMNICOM GROUP COM 681919106 285,953 285,953 17,979 0.0169
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.