Exhibit 99.3

FOR IMMEDIATE RELEASE

STAGWELL MARKETING GROUP LLC REPORTS STANDALONE RESULTS FOR THE THREE AND SIX MONTHS ENDED JUNE 30, 2021

Results show significant growth including a 29.1% increase in GAAP revenue to $209.6m and a 39.5% increase in net revenue to $181.8m for Q2 2021 vs Q2 2020.

After adjusting for acquisitions, foreign exchange effects, and the election cycle, GAAP revenue for the quarter grew 43.9% with net revenue growth of 42.0%.

Second quarter net income increased to $18.7 million, representing 285.1% growth over Q2 2020.

Adjusted EBITDA increased 91.5% in Q2 2021 vs Q2 2020.

STAGWELL MARKETING GROUP HIGHLIGHTS: 2^nd QUARTER AND YTD JUNE 30, 2021

2^nd Quarter 2021:

Year to Date June 30, 2021:

Washington, DC, August 4, 2021 – Stagwell Marketing Group, which formally merged with MDC Partners to form Stagwell Inc. (Nasdaq: STGW) on August 2, announced standalone financial results for Stagwell Marketing Group LLC (“Stagwell” or the “Company”) for the three and six months ended June 30, 2021.

Current Stagwell Inc. President and former Stagwell Group Partner Jay Leveton stated, “The standalone Stagwell Marketing Group quarterly results show industry-leading, double digit net revenue growth across every one of our business segments. As the impact of the pandemic recedes, marketers are investing in research and data analytics to better understand changes among their stakeholders and improve how they connect with them through digital channels -- areas where Stagwell companies excel. We have excellent momentum as we launch Stagwell Inc.”

Current Stagwell Inc. COO and former Stagwell Group CFO Ryan Greene commented, “In the second quarter of 2021, due to its digital first nature, Stagwell’s net revenue grew robustly at 39.5% and EBITDA increased 91.5% as did net income, by 285.1% year over year. At a time when legacy holding companies are working to recover to 2019 pre-pandemic revenue levels, Stagwell’s GAAP revenue this past quarter is more than 20% higher and EBITDA is over 40% higher versus Q2 2019.”

Second Quarter and Year-to-Date 2021 Stagwell Marketing Group Standalone Financial Results

GAAP revenue for the second quarter of 2021 increased $47.2 million, or 29.1%, to $209.6 million. This included organic revenue growth of $38.7 million, or 23.8%. Inorganic revenue was $7.5 million and we reported a foreign exchange impact on GAAP revenue of approximately $1.0 million. Our GAAP revenue includes third-party direct costs, which are expenses incurred with third-party vendors when Stagwell acts as the principal when performing services for its clients. Third-party direct costs were $27.7 million as compared to $32.0 million for the second quarter of 2020, which represents a decrease of 13.3%.

Net revenue for the second quarter of 2021, after deducting third-party direct costs, was $181.8 million compared to $130.4 million for the same period in 2020. This represents an increase of $51.5 million or 39.5%. This included organic revenue growth of $43.0 million, or 33.0%. The organic revenue increase was primarily attributable to double-digit organic growth across nearly all non-political segments. Inorganic revenue of $7.5 million included acquisitions that expanded our digital transformation and digital platform management offerings. We also recorded a foreign exchange impact on net revenue of $1.0 million.

Net income for the second quarter of 2021 was $18.7 million as compared to net income of $4.8 million in the second quarter of 2020, an increase of $13.8 million, or 285.1%. Our operating expenses increased $30.5 million, which related to additional people and client delivery expenses incurred in support of the revenue growth noted above plus additional costs connected to acquired brands. Additionally, general expenses increased $11.4 million across a number of brands and our non-operating expenses increased by $2.9 million, which primarily related to increased provision for income taxes.

Adjusted EBITDA for the second quarter of 2021 was $38.7 million compared to $20.2 million in the second quarter of 2020, an increase of $18.5 million, or 91.5%. The increase was driven by the strong revenue performance that was partially offset by the increase in operating expenses noted above. Our Adjusted EBITDA margin was 18.5% on GAAP revenue and 21.3% on net revenue, up from 12.5% and 15.5% respectively in the second quarter of 2020.

GAAP revenue for the first six months of 2021 increased $43.9 million, or 12.7%, to $390.8 million. This included organic revenue growth of $25.9 million, or 7.5%. Inorganic revenue was $17.1 million, and we recorded a foreign exchange impact on GAAP revenue of $0.9 million. The organic revenue growth was primarily attributable to a $26.2 million increase in organic revenues from our Digital – Marketing segment that were partially offset by an organic revenue decline of $18.6 million from our Communications, Public Affairs and Advocacy and Digital – Content segments. All remaining segments reported organic revenue growth of $18.4 million. Inorganic revenue totaled $17.1 million and included $15.0 million from investments that expanded our digital transformation offerings and $2.2 million from investments that expanded our strategic corporate communications offering. Third-party direct costs were $50.9 million as compared to $65.7 million for the first six months of 2020, which represents a decrease of 22.5%.

Net revenue for the first six months of 2021, after deducting third-party direct costs, was $339.9 million as compared to $281.2 million for the first six months of 2020, which represents an increase of $58.7 million or 20.9%. This included organic revenue growth of $40.8 million, or 14.5%. All segments except for Digital – Content, which remained impacted by travel restrictions put in place in response to COVID, reported double digit organic growth. Inorganic revenue was $17.1 million and included $15.0 million from investments that expanded our digital transformation offerings and $2.1 million from investments that expanded our strategic corporate communications offering. We also recorded a foreign exchange impact on net revenue of $0.9 million.

Net income for the first six months of 2021 was $23.3 million as compared to net income of $17.3 million in the first six months of 2020, an increase of $5.9 million, or 34.2%. Our operating expenses increased $31.9 million, which related to additional operating expenses incurred by our existing brands in support of the revenue growth noted above plus additional costs connected to acquired brands. General expenses increased $20.4 million across several brands and our non-operating expenses (net of other income) increased by $6.1 million, which primarily related to increased provision for income taxes of 3.4 million and a decrease in other income reported in prior period not repeated in the current period of $2.2 million.

Adjusted EBITDA for the first six months of 2021 was $62.6 million as compared to $41.8 million in the first six months of 2020, an increase of $20.7 million, or 49.5%. Again, the increase was driven by the strong revenue performance that was partially offset by the increase in operating expenses noted above. In addition, the adjusted EBITDA margin was 16.0% on GAAP revenue and 18.4% on net revenue, up from 12.1% and 14.9% respectively in the first six months of 2020.

Stagwell Inc. Conference Call

Management will host a video webcast and conference call on Wednesday, August 4, 2021, at 8:30 a.m. (ET) to discuss standalone results for Stagwell Marketing Group LLC and MDC Partners Inc. for the three and six months ended June 30, 2021.The video webcast will be accessible at https://kvgo.com/openexchange-inc/mdca-stagwell-earnings-call. An investor presentation has been posted on our website at www.stagwellglobal.com and may be referred to during the conference call.

A recording of the conference call will be accessible one hour after the call and available for ninety days at www.stagwellglobal.com.

About Stagwell Marketing Group

The Stagwell Marketing Group is the first and only independent, digital-first, and fully-integrated organization of size & scale servicing brands across the continuum of marketing services. Collaborative by design, Stagwell is not weighed down by legacy points of view and its people are united in their desire to innovate, evolve, grow and deliver superior results for their clients. Stagwell’s high growth brands include experts in four categories: digital transformation and marketing, research and insights, marketing communications, and content and media. Stagwell Media LP (“Stagwell Media), is a private equity fund that owns all interests in Stagwell Marketing Group LLC through a wholly owned holding company named Stagwell Marketing Group Holdings LLC. Stagwell Media, Stagwell Marketing Group LLC and its businesses are managed by The Stagwell Group, a registered investment advisor. The address of Stagwell is 1808 Eye Street, Floor 6, Washington, D.C., 20006.

As of the date hereof, Stagwell Agency Holdings and its affiliates, including Stagwell Media, and joint actors beneficially own 50,000 Series 6 preferred shares (representing 100% of the outstanding Series 6 preferred shares), 14,425,714 Class A common shares (representing 18.7% of the outstanding Class A common shares) and 179,970,051 voting-only Class C common shares (representing 100% of the outstanding voting-only Class C common shares) of Stagwell Inc., collectively representing 75.6% of the issued and outstanding voting shares of Stagwell Inc., as calculated on an as-converted basis.

Non-GAAP Financial Measures

Stagwell has included in this press release certain financial results that the Securities and Exchange Commission defines as "non-GAAP financial measures." Management believes that such non-GAAP financial measures, when read in conjunction with the Company's reported results, can provide useful supplemental information for investors analyzing period to period comparisons of the Company's results. Such non-GAAP financial measures include the following:

Net Revenue: “Net Revenue” is GAAP Revenue adjusted to exclude certain third-party direct costs when the Company acts as principal for the services rendered in the client arrangement.

Inorganic Revenue: “Inorganic Revenue” consists of (i) for acquisitions during the current year, the revenue effect from such acquisitions as if the acquisition had been owned during the equivalent period in the prior year and (ii) for acquisitions during the previous year, the revenue effect from such acquisitions as if they had been owned during that entire year (or same period as the current reportable period), taking into account their respective pre-acquisition revenues for the applicable periods.

Organic Revenue: Organic revenue is calculated by subtracting both the foreign exchange and acquisition (disposition) components from total revenue. “Organic revenue growth” and “organic revenue decline” refers to the positive or negative changes in revenue that were not attributable to the effects of foreign exchange or acquired run rate revenue from acquisitions. The organic revenue growth (decline) component reflects the constant currency impact of (a) the change in revenue of the Company’s Brands that have been held throughout each of the comparable periods presented, and (b) inorganic revenue.

Adjusted EBITDA: Adjusted EBITDA is a non-GAAP financial measure that represents net income adjusted for (a) interest expense, (b) provision for income taxes, (c) depreciation and amortization expense, (d) other income (expenses), (e) equity in earnings (losses) of unconsolidated affiliates, (f) deferred acquisition consideration adjustments, and (g) other items, net. Other items, net includes items such as acquisition-related expenses, other non-recurring items and other restructuring costs.

Included in the Company’s press release and supplemental management presentation are tables reconciling Stagwell’s GAAP results to arrive at certain of these non-GAAP financial measures.

This press release contains forward-looking statements. Statements in this press release that are not historical facts, including without limitation the information under the heading "Financial Outlook" and statements about the Company’s beliefs and expectations, earnings (loss) guidance, recent business and economic trends, potential acquisitions, and estimates of amounts for redeemable noncontrolling interests and deferred acquisition consideration, constitute forward-looking statements. Words such as “estimates”, “expects”, “contemplates”, “will”, “anticipates”, “projects”, “plans”, “intends”, “believes”, “forecasts”, “may”, “should”, and variations of such words or similar expressions are intended to identify forward-looking statements. These statements are based on current plans, estimates and projections, and are subject to change based on a number of factors, including those outlined in this section. Forward-looking statements speak only as of the date they are made, and the Company undertakes no obligation to update publicly any of them in light of new information or future events, if any.

Forward-looking statements involve inherent risks and uncertainties. A number of important factors could cause actual results to differ materially from those contained in any forward-looking statements. Such risk factors include, but are not limited to, the following:

Investors should carefully consider these risk factors, other risk factors described herein, and the additional risk factors outlined in more detail in MDC’s initial Form S-4, filed with the Securities and Exchange Commission (the “SEC”) on February 8, 2021, Amendment No.1 filed on March 29, 2021, Amendment No.2 filed on April 22, 2021, Amendment No.3 filed on April 30, 2021, and the Prospectus Supplement filed July 8, 2021, all of which are accessible on the SEC’s website at www.sec.gov.

SCHEDULE 1

STAGWELL MARKETING GROUP LLC AND SUBSIDIARIES

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

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STAGWELL MARKETING GROUP LLC AND SUBSIDIARIES

UNAUDITED REVENUE RECONCILIATION

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STAGWELL MARKETING GROUP LLC AND SUBSIDIARIES

UNAUDITED MANAGEMENT ADJUSTED RESULTS

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STAGWELL MARKETING GROUP LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

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STAGWELL MARKETING GROUP LLC AND SUBSIDIARIES

UNAUDITED SUMMARY CASH FLOW DATA

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STAGWELL MARKETING GROUP LLC AND SUBSIDIARIES

UNAUDITED RECONCILIATION OF NET INCOME TO ADJUSTED EBITDA

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STAGWELL MARKETING GROUP LLC AND SUBSIDIARIES

UNAUDITED RECONCILIATION OF COMPONENTS OF NON-GAAP MEASURES

Note: Actuals may not foot due to rounding.