UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
___________________
FORM 11-K
ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
FOR THE FISCAL YEAR ENDED DECEMBER 31, 2024
____________________

A. Full title of the plan and the address of the plan, if different from that of the issuer named below:

OMNICOM GROUP RETIREMENT SAVINGS PLAN
B. Name of issuer of the securities held pursuant to the plan and the address of its principal executive office:

OMNICOM GROUP INC.
280 Park Avenue
New York, NY 10017


OMNICOM GROUP RETIREMENT SAVINGS PLAN
ANNUAL REPORT ON FORM 11-K FOR THE YEAR ENDED DECEMBER 31, 2024

TABLE OF CONTENTS
Page
REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM:
PKF O'Connor Davies, LLP
FINANCIAL STATEMENTS:
Statement of Net Assets Available for Benefits as of December 31, 2024 and 2023
Statement of Changes in Net Assets Available for Benefits for the Years Ended December 31, 2024 and 2023
Notes to Financial Statements
SUPPLEMENTAL SCHEDULES:
Schedule H, Line 4a - Schedule of Delinquent Participant Contributions for the Year Ended December 31, 2024
Schedule H, Line 4i - Schedule of Assets (Held at End of Year) at December 31, 2024
SIGNATURE
EXHIBIT 23:
Consent of Independent Registered Public Accounting Firm14

i

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM


The Plan Administrator and Participants
Omnicom Group Retirement Savings Plan
New York, New York

Opinion on the Financial Statements
We have audited the accompanying statements of net assets available for benefits of the Omnicom Group Retirement Savings Plan (the Plan) as of December 31, 2024 and 2023, and the related statements of changes in net assets available for benefits for the years ended December 31, 2024 and 2023, and the related notes (collectively referred to as the financial statements). In our opinion, the financial statements present fairly, in all material respects, the net assets available for benefits of the Plan as of December 31, 2024 and 2023, and the changes in net assets available for benefits for the years ended December 31, 2024 and 2023, in conformity with accounting principles generally accepted in the United States of America.
Basis for Opinion
These financial statements are the responsibility of the Plan’s management. Our responsibility is to express an opinion on the Plan’s financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Plan in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. The Plan is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits, we are required to obtain an understanding of internal control over financial reporting, but not for the purpose of expressing an opinion on the effectiveness of the Plan’s internal control over financial reporting. Accordingly, we express no such opinion.
Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by the Plan's management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.
Supplemental Information
The supplemental information contained in: (1) Schedule H, Line 4a – Schedule of Delinquent Participant Contributions for the year ended December 31, 2024 and Schedule H, Line 4i - Schedule of Assets (Held at End of Year) at December 31, 2024 have been subjected to audit procedures performed in conjunction with the audit of the Plan's financial statements. The supplemental information is the responsibility of the Plan's management. Our audit procedures included determining whether the supplemental information reconciles to the financial statements or the underlying accounting and other records, as applicable, and performing procedures to test the completeness and accuracy of the information presented in the supplemental information. In forming our opinion on the supplemental information, we evaluated whether the supplemental information, including its form and content, is presented in conformity with the Department of Labor’s Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974. In our opinion, the supplemental information is fairly stated, in all material respects, in relation to the financial statements as a whole.


/s/ PKF O'Connor Davies, LLP

We have served as the Plan’s auditor since 2009.

Harrison, New York
June 30, 2025
PCAOB ID No. 127

1

OMNICOM GROUP RETIREMENT SAVINGS PLAN
STATEMENT OF NET ASSETS AVAILABLE FOR BENEFITS


December 31,
20242023
Assets:
Investments, at fair value:
Mutual Funds$468,094,524 $995,415,364 
Common/Collective Trusts3,665,201,911 2,576,560,728 
Company Stock102,272,331 108,884,573 
4,235,568,766 3,680,860,665 
Investments, at contract value206,039,150 223,600,010 
Total Investments4,441,607,916 3,904,460,675 
Receivables:
Employer contributions4,000,000 51,800,000 
Notes receivable from participants23,958,080 21,522,758 
Accrued interest and dividends833,725 881,892 
Due from broker for investments sold160,797 13,351 
Total Receivables28,952,602 74,218,001 
Total Assets4,470,560,518 3,978,678,676 
Liabilities:
Accrued expenses and other558,712 597,812 
Due to broker for investments purchased22,511 97,711 
Total Liabilities581,223 695,523 
Net Assets Available for Benefits$4,469,979,295 $3,977,983,153 






















See accompanying notes to financial statements.
2

OMNICOM GROUP RETIREMENT SAVINGS PLAN
STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS


Year Ended December 31,
20242023
Additions:
Contributions:
Employer$4,075,424 $51,909,733 
Participants211,536,779 202,697,066 
Rollovers52,456,920 26,894,978 
268,069,123 281,501,777 
Dividend and interest income52,245,981 42,892,889 
Settlement proceeds1,308,804 — 
Net appreciation in fair value of investments579,618,771 609,100,341 
Total Additions901,242,679 933,495,007 
Deductions:
Benefits paid450,030,350 349,079,963 
Administrative expenses1,924,473 1,896,452 
Total Deductions451,954,823 350,976,415 
Net increase449,287,856 582,518,592 
Assets transferred into Plan42,708,286 5,028,513 
Net assets available for benefits:
Beginning of year3,977,983,153 3,390,436,048 
End of year$4,469,979,295 $3,977,983,153 
























See accompanying notes to financial statements.
3

OMNICOM GROUP RETIREMENT SAVINGS PLAN
NOTES TO FINANCIAL STATEMENTS
1. Description of Plan
The following brief description of the Omnicom Group Retirement Savings Plan, or the Plan, provides only general information. Participants should refer to the Summary Plan Description, or SPD, or the Plan document for a more complete description of the Plan’s provisions. In the event of any conflict between the SPD and the Plan document, the Plan document will control.
General
The Plan is a defined contribution retirement plan covering all eligible employees of participating companies of Omnicom Group Inc., or the Company, and the Company is the sponsor of the Plan. The Plan is subject to the provisions of the Employee Retirement Income Security Act of 1974, as amended, or ERISA, and to the provisions of the Internal Revenue Code of 1986, as amended, or the Code, as it pertains to plans intended to qualify under Section 401(a) of the Code. The Administrative Committee, or the Committee, comprised of persons appointed by the Company’s Board of Directors, or its delegate, administers the Plan and is responsible for resolving all questions that may arise under the Plan. The Plan’s assets are held in trust with Fidelity Management Trust Company, or the Trustee, and an affiliate of the Trustee performs the recordkeeping services for the Plan.
Eligibility and Plan Entry Dates
For the 401(k) and matching contribution features of the Plan, eligible employees of participating companies can enroll in the Plan as soon as administratively practicable following employment.
Contributions
Each year, participants may contribute from 1% to 70% of their eligible pre-tax compensation, up to the maximum allowed under the Code. Participants who are age 50 or older during the Plan year are eligible to contribute additional pre-tax catch-up contributions. Beginning in 2023, a Roth 401(k) feature was added to the Plan; where participants may elect to make after-tax Roth 401(k) contributions. The Plan accepts rollover contributions from other employers’ qualified plans and from conduit Individual Retirement Accounts.
Each participating company may make discretionary matching contributions, or Employer Contributions, to the Plan each year on behalf of its eligible employees. Participants are generally eligible to receive Employer Contributions, if any, if they are active employees on the last day of the Plan year and are credited with at least 1,000 hours of service during the Plan year. Employer Contributions, if any, are deposited and allocated to the accounts of eligible participants after each Plan year-end. With respect to the 2024 Plan year, the discretionary Employer Contributions were considerably less than prior years. Prior to 2023, certain participating companies made discretionary profit sharing contributions as Employer Contributions on behalf of its eligible employees.
Participant Accounts
Participants direct the investment of their accounts into various investment options offered by the Plan. Each participant’s account is credited with the participant’s contributions, allocations of discretionary Employer Contributions, and investment income or losses, which consists of interest, dividends, and the net realized and unrealized investment gains and losses, less administrative expenses, for the investment option in which that account is invested. The benefit to which a participant is entitled is the participant’s vested account balance.
The investment option that allows participants to invest in Omnicom Group Inc. common stock, or Company Stock, has been designated as an Employee Stock Ownership Plan, or ESOP. Participants may elect to receive any dividends paid on their vested shares held in the ESOP as a cash payment instead of being reinvested in the Plan.
Vesting
Participants vest in any employer matching contributions according to the following schedule, as adopted by each participating company:
0 %for less than 2 years,
40 %for 2 years but less than 3 years,
100 %for 3 years or more; or,

4

Participants vest in prior employer profit sharing contributions according to the following schedule:
0 %for less than 2 years,
20 %for 2 years but less than 3 years,
50 %for 3 years but less than 4 years,
70 %for 4 years but less than 5 years,
100 %for 5 years or more.
In addition, the Plan maintains certain more favorable vesting schedules, which were grandfathered for eligible participants when retirement plans separately sponsored by subsidiaries of the Company were merged into the Plan.
Forfeitures
Forfeited non-vested account balances may be used to reduce Employer Contributions or pay Plan expenses. Forfeitures of $8.9 million and $6.2 million were used to reduce Employer Contributions at December 31, 2024 and 2023, respectively. The Employer Contribution receivable at December 31, 2024 and 2023 reflects the reduction of the forfeitures for those years.
Benefit Payments
Upon termination of employment, retirement, disability or death, participants, or their beneficiaries, may elect to receive the vested portion of their account in the form of a direct rollover, a lump-sum distribution, partial lump-sum distributions, or annual installment payments for up to 20 years. Terminated participants may defer payment of their account until they are required to receive a distribution in accordance with the Code. The Plan provides that accounts of terminated participants are distributed if their vested balance is $1,000 or less. The Plan also allows hardships withdrawals, if certain conditions are met, and has an in-service withdrawal provision for employees who are age 59 ½ or older.
Notes Receivable from Participants
Generally, participants who are active employees may borrow from their accounts a minimum amount of $1,000 up to a maximum amount equal to the lesser of $50,000 or 50% of their vested account balance. Loans are secured by the balance in the participant’s account and bear interest at 1% above the prime rate in effect at the time the loan was initiated. Interest rates for outstanding loans range from 4.25% to 9.50% at December 31, 2024 and 3.25% to 9.50% at December 31, 2023. Principal and interest are generally repaid through payroll deductions. General purpose loans must be repaid within five years and loans granted for principal residences must be repaid within 15 years. However, loans granted for principal residences that were transferred from merged plans may have longer maturity dates.
Investment Option Changes
The Committee periodically reviews the Plan's investment options and may change the investment options available to the participants. Effective December 6, 2024, the Fidelity Freedom Blend 2070 Commingled Pool Class T was added as an investment option, and two investment options, the Fidelity 500 Index Fund and the Fidelity Contrafund Commingled Pool Class D were replaced with similar investment options, the Spartan 500 Index Pool Class D and the Fidelity Contrafund Commingled Pool Class F. In 2023, three investment options, the JPMorgan Large Cap Growth Fund Class R6, Fidelity Diversified International Commingled Pool Class A, and Fidelity Contrafund Commingled Pool Class A were replaced with similar investment options, the JPMCB Large Cap Growth Fund CF-A Class, Fidelity Diversified International Commingled Pool Class C and Fidelity Contrafund Commingled Pool Class D.
Administrative Expenses
Expenses arising from participants’ individual investment elections or transactions, including loan set up fees, are paid directly by the participant. Participants with balances of $1,000 or more are charged a recordkeeping fee of $34 per year and an administrative fee of $12 per year. Direct participant expenses, recordkeeping fees and administrative fees are included in administrative expenses in the Statement of Changes in Net Assets Available for Benefits.
Assets Transferred into Plan
In 2024 two separate retirement plans sponsored by subsidiaries of the Company, the TPN Holdings LLC 401(k) Plan and a portion of the assets of the Insperity 401(k) Plan attributable to the employees of Ptamigan Media Inc. were merged into the Plan and assets of approximately $42.7 million were transferred into the Plan. In 2023, two separate retirement plans sponsored by subsidiaries of the Company (the TechAspect 401(k) Plan and the Propeller Consulting LLC 401(k) Plan) were merged into the Plan and assets of approximately $5.0 million were transferred into the Plan.
5

2. Summary of Significant Accounting Policies
Basis of Accounting
The Plan’s financial statements are prepared on the accrual basis of accounting in conformity with generally accepted accounting principles in the United States, or U.S. GAAP.
Use of Estimates
The preparation of financial statements in conformity with U.S. GAAP requires the Plan's management to make estimates and assumptions that affect the reported amounts of assets and liabilities, additions to and deductions from net assets, and disclosure of contingent assets and liabilities. Actual results could differ from those estimates and assumptions and the difference could be material.
Investments
Investments in funds of registered investment companies (mutual funds) are stated at fair value. Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date.
Shares of mutual funds are valued at quoted market prices.Shares of certain common/collective trusts are valued at the net asset value, or NAV, as reported by the trustees and are based on the fair value of the underlying net assets. The NAV is used as a practical expedient to estimate fair value. Each common/collective trust provides for daily redemption at the reported NAV per share with no advance notice. There were no unfunded commitments as of December 31, 2024 and 2023. Shares of Company Stock are valued at the closing price as reported on The New York Stock Exchange.
The Fidelity Managed Income Portfolio II, or MIP II, is a common/collective trust that holds fully benefit-responsive investment contracts (see Note 3) and is stated at contract value. Contract value is the relevant measurement attribute for fully benefit-responsive investment contracts because contract value is the amount participants would receive if they were to initiate permitted transactions under the Plan.
Purchases and sales of investments are recorded on the trade date. Dividends are recorded on the ex-dividend date. Interest income is recorded on the accrual basis. The net appreciation (depreciation) in the fair value of investments consists of the net realized and unrealized investment gains and losses.
The Empower Guaranteed Income Fund is a carry-over investment from the TPN Holdings LLC 401(k) Plan, which was transferred into the Plan in 2024. This investment is not an investment option for Plan participants.
Fair Value Measurement
The Plan applies the fair value measurement guidance for its financial assets and liabilities that are required to be measured at fair value on a recurring basis. The measurement of fair value requires the use of techniques based on observable and unobservable inputs. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect the Plan’s market assumptions. The inputs establish the following fair value hierarchy:
Level 1 - Unadjusted quoted prices in active markets for identical assets or liabilities.
Level 2 - Unadjusted quoted prices in active markets for similar assets or liabilities; unadjusted quoted prices for identical assets or liabilities in markets that are not active; and model-derived valuations with observable inputs.
Level 3 - Unobservable inputs for the asset or liability.
Investments where fair value is measured using NAV as a practical expedient are not categorized in the fair value hierarchy.
Notes Receivable from Participants
Notes receivable from participants are measured at the unpaid principal balance, plus any accrued interest. As provided for in the Plan, delinquent notes receivable are classified as benefit payments and are reflected in the statement of changes in net assets available for benefits.
Benefit Payments
Benefits are recorded when paid.
Risk and Uncertainties
The Plan provides participants with various investment options. Investment securities, in general, are exposed to various risks, such as interest rate risk, credit risk, liquidity risk, foreign currency risk, economic changes, and overall market volatility risk. The value of the Plan's investments is subject to volatility. Due to the level of risk associated with certain investment securities, it is reasonably possible that changes in the values of investment securities will occur in the near term and that such changes could materially affect the amounts reported in the financial statements and participants' account balances.
6

In addition, global economic disruptions, including geopolitical events, international hostilities, acts of terrorism, public health crises, inflation or stagflation, tariffs and other trade barriers, central bank interest rate policies and labor and supply chain challenges could cause economic uncertainty and volatility. The future impact on the Plan’s net assets available for benefits and changes in net assets available for benefits is uncertain.
3. Investment in Fully Benefit Responsive Contracts
The underlying assets of MIP II are comprised of fixed income securities, including U.S. Treasury and agency bonds, publicly traded investment grade corporate debt, asset-backed securities, and other debt securities, and money market funds. The securities are “wrapped” by synthetic investment contracts that provide liquidity for participant withdrawals by maintaining a constant net asset value. The issuers of the wrap contracts guarantee a minimum rate of return and provide full benefit responsiveness. Wrap contracts are purchased from issuers rated in the top three long-term rating categories (A- or the equivalent and above). The contract value of MIP II is determined by the Trustee and is equal to the sum of all of the benefits owed to participants. Participants may ordinarily direct the withdrawal or transfer of all or a portion of their investment in MIP II at contract value. At December 31, 2024 and 2023, there were no reserves against the wrap contracts carrying value due to the credit risk of the issuers. The interest crediting rates for MIP II at December 31, 2024 and 2023 were 2.72% and 2.13%, respectively.
4. Investments
Investments measured at fair value:
December 31,
20242023
Omnicom Group Inc. Common Stock$102,272,331 $108,884,573 
Spartan 500 Index Pool Class D661,722,526 — 
Fidelity 500 Index Fund— 543,018,300 
Fidelity Contrafund Commingled Pool Class F511,152,193 — 
Fidelity Contrafund Commingled Pool Class D— 408,781,341 
JPMCB Large Cap Growth CF-A Class259,636,627 196,375,618 
T. Rowe Price Institutional Large Cap Value Fund162,743,008 157,533,317 
Fidelity Diversified International Commingled Pool Class C153,771,132 153,712,747 
AB Discovery Value Fund Class Z 130,774,077 131,342,805 
William Blair Small-Mid Cap Growth CIT125,132,900 120,930,627 
PIMCO Total Return Fund Institutional Class103,884,862 103,914,008 
Vanguard FTSE Social Index Fund IS69,692,745 59,096,848 
State Street U.S. Bond Index Fund Class XIV24,887,631 28,050,357 
State Street Global All Cap Equity Ex-U.S. Index Fund Class II19,147,439 22,964,709 
State Street Russell Small/Mid Cap Index Fund Class II36,091,574 17,714,848 
Fidelity Freedom Blend Income Commingled Pool Class T10,152,441 7,118,708 
Fidelity Freedom Blend 2005 Commingled Pool Class T— 2,922,471 
Fidelity Freedom Blend 2010 Commingled Pool Class T6,322,733 9,235,328 
Fidelity Freedom Blend 2015 Commingled Pool Class T9,910,597 10,718,621 
Fidelity Freedom Blend 2020 Commingled Pool Class T33,240,211 35,948,358 
Fidelity Freedom Blend 2025 Commingled Pool Class T87,050,854 89,360,765 
Fidelity Freedom Blend 2030 Commingled Pool Class T149,037,005 140,938,437 
Fidelity Freedom Blend 2035 Commingled Pool Class T240,731,405 211,502,357 
Fidelity Freedom Blend 2040 Commingled Pool Class T281,108,386 253,448,441 
Fidelity Freedom Blend 2045 Commingled Pool Class T293,645,061 253,843,001 
Fidelity Freedom Blend 2050 Commingled Pool Class T329,621,593 280,759,507 
Fidelity Freedom Blend 2055 Commingled Pool Class T255,551,019 205,518,823 
Fidelity Freedom Blend 2060 Commingled Pool Class T144,257,385 108,099,829 
Fidelity Freedom Blend 2065 Commingled Pool Class T33,031,153 18,615,835 
Fidelity Freedom Blend 2070 Commingled Pool Class T46 — 
Fidelity Government Money Market Fund999,832 510,086 
$4,235,568,766 $3,680,860,665 
7

The net appreciation (depreciation) in the fair value of investments:
Year Ended December 31,
20242023
Omnicom Group Inc. Common Stock$256,553 $6,720,279 
Spartan 500 Index Pool Class D(22,968,250)— 
Fidelity 500 Index Fund152,459,323 105,919,001 
Fidelity Contrafund Commingled Pool Class F(21,771,992)— 
Fidelity Contrafund Commingled Pool Class D162,976,569 5,843,820 
Fidelity Contrafund Comingled Pool Class A— 108,671,630 
JPMCB Large Cap Growth CF-A Class66,844,001 2,379,168 
T. Rowe Price Institutional Large Cap Value Fund4,983,480 1,826,900 
JPMorgan Large Cap Growth Fund Class R6— 48,892,512 
Fidelity Diversified International Commingled Pool Class C10,608,980 3,252,243 
Fidelity Diversified International Commingled Pool Class A— 20,618,019 
AB Discovery Value Fund Class Z (4,907,759)11,370,526 
William Blair Small-Mid Cap Growth CIT13,502,174 18,836,549 
PIMCO Total Return Fund Institutional Class(2,113,251)2,307,484 
Vanguard FTSE Social Index Fund IS14,377,290 13,184,569 
State Street Russell Small/Mid Cap Index Fund Class II5,019,805 5,502,925 
State Street U.S. Bond Index Fund Class XIV308,559 1,240,721 
State Street Global All Cap Equity Ex-U.S. Index Fund Class II964,563 2,335,684 
Fidelity Freedom Blend Income Commingled Pool Class T371,296 542,322 
Fidelity Freedom Blend 2005 Commingled Pool Class T39,862 227,208 
Fidelity Freedom Blend 2010 Commingled Pool Class T448,720 824,618 
Fidelity Freedom Blend 2015 Commingled Pool Class T619,962 1,136,628 
Fidelity Freedom Blend 2020 Commingled Pool Class T2,479,985 4,293,599 
Fidelity Freedom Blend 2025 Commingled Pool Class T6,936,287 11,153,189 
Fidelity Freedom Blend 2030 Commingled Pool Class T12,630,081 19,004,270 
Fidelity Freedom Blend 2035 Commingled Pool Class T22,130,547 31,360,157 
Fidelity Freedom Blend 2040 Commingled Pool Class T32,272,378 41,552,214 
Fidelity Freedom Blend 2045 Commingled Pool Class T34,587,294 42,392,065 
Fidelity Freedom Blend 2050 Commingled Pool Class T38,826,659 46,357,723 
Fidelity Freedom Blend 2055 Commingled Pool Class T29,105,586 32,698,475 
Fidelity Freedom Blend 2060 Commingled Pool Class T15,638,293 16,324,229 
Fidelity Freedom Blend 2065 Commingled Pool Class T2,991,776 2,331,614 
Fidelity Freedom Blend 2070 Commingled Pool Class T— — 
$579,618,771 $609,100,341 
8

5. Fair Value
Investments measured at fair value on a recurring basis:
December 31, 2024
Level 1Level 2Level 3Total
Mutual Funds$468,094,524 $— $— $468,094,524 
Company Stock102,272,331 — — 102,272,331 
Common/Collective Trusts measured at NAV
   as a practical expedient		— — — 3,665,201,911 
$570,366,855 $— $— $4,235,568,766 
December 31, 2023
Level 1Level 2Level 3Total
Mutual Funds$995,415,364 $— $— $995,415,364 
Company Stock108,884,573 — — 108,884,573 
Common/Collective Trusts measured at NAV
   as a practical expedient		— — — 2,576,560,728 
$1,104,299,937 $— $— $3,680,860,665 
6. Party-In-Interest Transactions
Certain investments are managed by the Trustee or certain of its affiliates. These investments qualify as exempt party-in-interest transactions under ERISA. Fees paid by the Plan for investment related services are included in net appreciation (depreciation) in fair value of investments in the Statement of Changes in Net Assets Available for Benefits.
One of the Plan's investment options invests exclusively in Company Stock. At December 31, 2024 and 2023, the Plan owned 1,188,574 and 1,258,561 shares of Company Stock, respectively, with a corresponding fair value of $102.3 million and $108.9 million, respectively.
Additionally, participants who are active employees may borrow from their accounts and such loans qualify as exempt party-in-interest transactions under ERISA. These loans are recorded as notes receivable from participants in the Statement of Net Assets Available for Benefits.
7. Plan Amendment or Termination
The Company or its delegate has the right to amend the Plan at any time. In addition, although it has not expressed any intent to do so, the Company has the right under the Plan to discontinue its contributions at any time and to terminate the Plan, subject to the provisions of ERISA. In the event of Plan termination or the complete discontinuance of contributions by the Company under the Plan, the participants’ accounts will become fully vested in accordance with the terms of the Plan.
8. Tax Status
The Plan is a retirement plan that is designed to satisfy the qualification requirements under Section 401(a) of the Code and therefore, is not subject to tax under present income tax regulations. The Internal Revenue Service, or IRS, has determined and informed the Company by letter dated November 20, 2015, that the terms of the Plan and related trust comply with applicable sections of the Code. Although the Plan has been amended since receiving the determination letter, the Plan administrator and the Plan’s counsel believe that the Plan is designed and is currently being operated in compliance with the applicable requirements of the Code.
U.S. GAAP requires the Plan's management to evaluate tax positions taken by the Plan and recognize a tax liability or asset if the Plan has taken an uncertain position that more likely than not would not be sustained upon examination by the IRS. The Plan's management has analyzed the tax positions taken by the Plan, and has concluded that as of December 31, 2024, there were no uncertain positions taken or expected to be taken that would require recognition of a liability or asset or disclosure in the Plan’s financial statements. The Plan is subject to routine examination by various taxing jurisdictions. Currently, there are no open examinations for any period.
9. Delinquent Participant Contributions
In 2024, one participating company failed to remit $2,763 of employee contributions to the Plan in a timely manner. This amount was subsequently remitted to the Plan. The Trustee computed the applicable earnings to the participants
and the participating company subsequently remitted these earnings to the Plan.

9

10. Settlement Proceeds
The Company resolved a lawsuit that claimed certain actions related to the Plan violated ERISA’s fiduciary rules. Although the Company, its officers, and the Plan’s Administrative Committee strongly denied any wrongdoing and actively contested the allegations, they chose to settle the case to avoid continued litigation. The Court approved the settlement on December 12, 2023. In accordance with the Court-approved allocation plan, a total of $1,308,804 in settlement proceeds was distributed to participants’ accounts in the Plan in 2024.
11. Subsequent Events
The Committee evaluated events subsequent to the date of the statement of net assets available for benefits and determined there have not been any other events that have occurred that would require adjustment to or disclosure in the financial statements.
10

OMNICOM GROUP RETIREMENT SAVINGS PLAN
Schedule H, Line 4a - Schedule of Delinquent Contributions
For The Year Ended December 31, 2024
EIN: 13-1514814
Plan No. 004

Total that Constitutes Non-Exempt Prohibited Transactions
Participant Contributions
and
Loan Repayments
Transferred Late
to the Plan		Contributions
Not Corrected		Contributions
Corrected
Outside VFCP		Contributions
Pending Correction
In VFCP		Total Fully Corrected
Under VFCP and PTE
(Prohibited Transaction
Exemption)
$2,763 $— $2,763 $— $— 

In 2024, one participating company failed to remit $2,763 of employee contributions to the Plan in a timely manner. This amount was subsequently remitted to the Plan. The Trustee computed the applicable earnings to the participants and the participating company subsequently remitted these earnings to the Plan.

































See report of independent registered public accounting firm.
11

OMNICOM GROUP RETIREMENT SAVINGS PLAN
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)
December 31, 2024
EIN: 13-1514814
Plan No. 004
(a)(b)(c)(d)(e)
Identity of issue, borrower, lessor or similar party
Description of investment, including maturity date, rate of interest, collateral, par or maturity value
Shares
CostCurrent value
*Omnicom Group Inc. Common StockCommon Stock
$0.15 par value		1,188,574 a$102,272,331 
*Fidelity Managed Income Portfolio IICommon/Collective Trust205,850,677 a205,850,677 
*Spartan 500 Index Pool Class DCommon/Collective Trust2,399,980 a661,722,526 
*Fidelity Contrafund Commingled Pool Class FCommon/Collective Trust11,184,950 a511,152,193 
JPMCB Large Cap Growth CF-A ClassCommon/Collective Trust2,335,282 a259,636,627 
T. Rowe Price Institutional Large Cap Value FundMutual Fund7,042,103 a162,743,008 
*Fidelity Diversified International Commingled Pool Class CCommon/Collective Trust8,209,884 a153,771,132 
AB Discovery Value Fund Class Z Mutual Fund6,410,494 a130,774,077 
William Blair Small-Mid Cap Growth CITCommon/Collective Trust2,968,977 a125,132,900 
PIMCO Total Return Fund Institutional ClassMutual Fund12,250,573 a103,884,862 
Vanguard FTSE Social Index Fund ISMutual Fund1,716,570 a69,692,745 
State Street Russell Small/Mid Cap Index Fund Class IICommon/Collective Trust1,959,688 a36,091,574 
State Street U.S. Bond Index Fund Class XIVCommon/Collective Trust2,312,117 a24,887,631 
State Street Global All Cap Equity Ex-U.S. Index Fund Class IICommon/Collective Trust1,368,456 a19,147,439 
*Fidelity Freedom Blend Income Commingled Pool Class TCommon/Collective Trust601,804 a10,152,441 
*Fidelity Freedom Blend 2010 Commingled Pool Class TCommon/Collective Trust301,513 a6,322,733 
*Fidelity Freedom Blend 2015 Commingled Pool Class TCommon/Collective Trust444,222 a9,910,597 
*Fidelity Freedom Blend 2020 Commingled Pool Class TCommon/Collective Trust1,450,904 a33,240,211 
*Fidelity Freedom Blend 2025 Commingled Pool Class TCommon/Collective Trust3,510,115 a87,050,854 
*Fidelity Freedom Blend 2030 Commingled Pool Class TCommon/Collective Trust5,747,667 a149,037,005 
*Fidelity Freedom Blend 2035 Commingled Pool Class TCommon/Collective Trust8,283,944 a240,731,405 
*Fidelity Freedom Blend 2040 Commingled Pool Class TCommon/Collective Trust9,216,668 a281,108,386 
*Fidelity Freedom Blend 2045 Commingled Pool Class TCommon/Collective Trust9,475,478 a293,645,061 
*Fidelity Freedom Blend 2050 Commingled Pool Class TCommon/Collective Trust10,793,110 a329,621,593 
*Fidelity Freedom Blend 2055 Commingled Pool Class TCommon/Collective Trust7,803,085 a255,551,019 
*Fidelity Freedom Blend 2060 Commingled Pool Class TCommon/Collective Trust6,572,090 a144,257,385 
*Fidelity Freedom Blend 2065 Commingled Pool Class TCommon/Collective Trust1,920,416 a33,031,153 
*Fidelity Freedom Blend 2070 Commingled Pool Class TCommon/Collective Trust4 a46 
*Fidelity Government Money Market FundMutual Fund999,832 a999,832 
Empower Guaranteed Income FundCommon/Collective Trust188,473 a188,473 
*Notes receivable from participantsParticipant Loans**—23,958,080 
$4,465,565,996 
* Represents a party-in-interest as defined by ERISA.
** Maturity dates through May 2042. Interest rates range from 4.25% to 9.50%.
a - The cost of participant-directed investments is not required to be disclosed.


See report of independent registered public accounting firm.
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SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the Administrative Committee of the Plan has duly caused this annual report to be signed on its behalf by the undersigned hereunto duly authorized.
 OMNICOM GROUP RETIREMENT SAVINGS PLAN
Dated:June 30, 2025/s/ Leslie Chiocco
 Leslie Chiocco
Member of Administrative Committee

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ATTACHMENTS / EXHIBITS

ATTACHMENTS / EXHIBITS

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