Exhibit 99.1

FOR IMMEDIATE ISSUE

STAGWELL INC. (NASDAQ: STGW) REPORTS STANDALONE MDC PARTNERS INC. RESULTS FOR THE

THREE AND SIX MONTHS ENDED JUNE 30, 2021

Strong quarterly revenue growth of 33% year-over-year to $346 million

Second quarter Net Income attributable to MDC Partners common shareholders of $1.7 million

Record second quarter Adjusted EBITDA of $60 million, up 67% from the prior period

SECOND QUARTER & YTD MDC PARTNERS INC. HIGHLIGHTS:

New York, NY, August 4, 2021 (NASDAQ: STGW) – Stagwell Inc. (“Stagwell”) today announced MDC Partners Inc. (“MDC Partners,” “legacy MDC” or the “Company”) financial results for the three and six months ended June 30, 2021.

"Stagwell is coming out of the gate firing on all cylinders. We are pleased to report industry-leading revenue growth and record second quarter Adjusted EBITDA at legacy MDC,” said Mark Penn, Chairman and Chief Executive Officer of Stagwell. “We are encouraged by the continued strength through the first half of the year and saw broad-based growth across the network. Our digital businesses saw another quarter of high double-digit growth and our creative agencies won considerable new business during the active second quarter pitch season. These results show the potential of our combined platform that brings together culture-moving creativity and leading-edge technology onto a single, integrated platform.”

Second Quarter and Year-to-Date 2021 MDC Partners Standalone Financial Results

Revenue for the second quarter of 2021 was $345.6 million versus $259.7 million for the second quarter 2020, an increase of 33.1%. The effect on revenue of foreign exchange was positive 1.8% and the organic revenue increase was 31.3%, inclusive of $19.0 million or 446 basis points from higher billable costs. Organic revenue increased primarily due to a continuation of the recovery in spending by clients begun in the first quarter.

Revenue in the second quarter of 2021 increased 12.4% sequentially from the first quarter, as revenue continues to rebound from the impact of the pandemic. Net New Business wins in the second quarter of 2021 totaled $56.9 million as we capitalized on a particularly active pitch season.

Net income attributable to MDC Partners common shareholders for the second quarter of 2021 was $1.7 million versus a net loss of $4.1 million for the second quarter of 2020. The increase was primarily due to higher revenues in the quarter, as well as the favorable impact of foreign exchange. Diluted income per share attributable to MDC Partners common shareholders for the second quarter of 2021 was $0.02 versus diluted loss per share of $0.06 for the second quarter of 2020.

Adjusted EBITDA for the second quarter of 2021 was $60.3 million versus $36.2 million for the second quarter of 2020, an increase of 66.7%, primarily due to higher revenues, partially offset by an increase in operating expense. This led to a 350 basis point increase in Adjusted EBITDA margin in the second quarter of 2021 to 17.4% from 13.9% in the second quarter of 2020.

Covenant EBITDA for the last twelve months (LTM) was $220.1 million as of June 30, 2021, up from $193.3 million in the second quarter of 2020.

Revenue for the first six months of 2021 was $653.2 million versus $587.4 million in the prior year period. The effect on revenue of foreign exchange was positive 1.6%, the impact of non-GAAP acquisitions (dispositions), net was negative 0.4%, and the organic revenue increase was 10.0%.

Net income attributable to MDC Partners Inc. common shareholders for the first six months of 2021 was $2.6 million versus net loss of $6.5 million for the first six months of 2020. The increase was primarily due to higher revenues, partially offset by an increase in operating expenses. Diluted income per share attributable to MDC Partners common shareholders for the six months of 2021 was $0.03 versus diluted loss per share of $0.09 for the first six months of 2020.

Adjusted EBITDA for the first six months of 2021 was $112.2 million versus $75.7 million in the first six months of 2020, an increase of 48.2%. This lead to an Adjusted EBITDA Margin of 17.2% versus 12.9% in prior year period, an increase of 430 basis points.

Stagwell Inc. Financial Outlook

2021 financial guidance is as follows:

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 Inc.

Stagwell is the challenger holding company built to transform marketing. We deliver scaled creative performance for the world’s most ambitious brands, connecting culture-moving creativity with leading-edge technology to harmonize the art and science of marketing. Led by entrepreneurs, our 10,000+ specialists in 30+ countries are unified under a single purpose: to drive effectiveness and improve business results for our clients. Stagwell Inc. is the successor SEC Registrant to MDC Partners Inc. Join us at www.stagwellglobal.com.

Non-GAAP Financial Measures

In addition to its MDC Partners Inc. reported results, Stagwell Inc has included in this earnings release certain financial results that the Securities and Exchange Commission (SEC) 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:

(1) Organic Revenue: “Organic revenue growth” and “organic revenue decline” refer to the positive or negative results, respectively, of subtracting both the foreign exchange and acquisition (disposition) components from total revenue growth. The acquisition (disposition) component is calculated by aggregating prior period revenue for any acquired businesses, less the prior period revenue of any businesses that were disposed of during the current period. The organic revenue growth (decline) component reflects the constant currency impact of (a) the change in revenue of the partner firms that the Company has held throughout each of the comparable periods presented, and (b) “non-GAAP acquisitions (dispositions), net”. Non-GAAP acquisitions (dispositions), net consists of (i) for acquisitions during the current year, the revenue effect from such acquisition 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, and (iii) for dispositions, the revenue effect from such disposition as if they had been disposed of during the equivalent period in the prior year.

(2) Net New Business: Estimate of annualized revenue for new wins less annualized revenue for losses incurred in the period.

(3) Adjusted EBITDA: Adjusted EBITDA is a non-GAAP financial measure that represents Net income (loss) attributable to MDC Partners Inc. common shareholders plus or minus non-operating items to operating income (loss) plus depreciation and amortization, stock-based compensation, deferred acquisition consideration adjustments, distributions from non-consolidated affiliates, and other items, net which includes items such as merger related costs, severance and other restructuring expenses, including costs for leases that will either be terminated or sublet in connection with the centralization of our New York real estate portfolio.

(4) Covenant EBITDA: Covenant EBITDA is a measure that includes pro forma adjustments for acquisitions, one-time charges, permitted dispositions and other items, as defined in the Company's Credit Agreement. We believe that the presentation of Covenant EBITDA is useful to investors as it eliminates the effect of certain non-cash and other items not necessarily indicative of a company’s underlying operating performance. In addition, the presentation of Covenant EBITDA provides additional information to investors about the calculation of, and compliance with, certain financial covenants in the Company's Credit Agreement.

(5) Financial Guidance: The Company provides guidance on a non-GAAP basis as it cannot predict certain elements which are included in reported GAAP results.

Included in this earnings release are tables reconciling reported MDC Partners Inc. 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 the Company’s 2020 Form 10-K, filed with the Securities and Exchange Commission (the “SEC”) on March 16, 2021 and accessible on the SEC’s website at www.sec.gov., under the caption “Risk Factors,” and in the Company’s other SEC filings.

SCHEDULE 1

MDC PARTNERS INC.

UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS

(US$ in 000s, Except per Share Amounts)

SCHEDULE 2

MDC PARTNERS INC.

UNAUDITED REVENUE RECONCILIATION

(US$ in 000s, except percentages)

⁽¹⁾ Organic revenue refers to the positive results of subtracting both the foreign exchange and acquisition (disposition) components from total revenue growth. The acquisition (disposition) component is calculated by aggregating prior period revenue for any acquired businesses, less the prior period revenue of any businesses that were disposed of during the current period. The organic revenue component reflects the constant currency impact of (a) the change in revenue of the partner firms which the Company has held throughout each of the comparable periods presented, and (b) “non-GAAP acquisitions (dispositions), net”. Non-GAAP acquisitions (dispositions), net consists of (i) for acquisitions during the current year, the revenue effect from such acquisition 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, and (iii) for dispositions, the revenue effect from such disposition as if they had been disposed of during the equivalent period in the prior year. See "Non-GAAP Financial Measures" herein.

Note: Actuals may not foot due to rounding.

SCHEDULE 3

MDC PARTNERS INC.

UNAUDITED RECONCILIATION OF NET INCOME (LOSS) TO ADJUSTED EBITDA

(US$ in 000s, except percentages)

For the Three Months Ended June 30, 2021

⁽¹⁾ Distributions from non-consolidated affiliates includes (i) cash received for profit distributions from non-consolidated affiliates, and (ii) consideration from the sale of ownership interests in non-consolidated affiliates less contributions to date plus undistributed earnings (losses).

⁽²⁾ Other items, net includes items such as merger related costs, severance and other restructuring expenses. See Schedule 10 for a reconciliation of amounts.

⁽³⁾ Adjusted EBITDA is a non-GAAP financial measure, and as shown above it represents operating income (loss) plus depreciation and amortization, stock-based compensation, deferred acquisition consideration adjustments, distributions from non-consolidated affiliates, impairment and other items. See "Non-GAAP Financial Measures" herein.

Note: Actuals may not foot due to rounding.

SCHEDULE 4

MDC PARTNERS INC.

UNAUDITED RECONCILIATION OF NET INCOME (LOSS) TO ADJUSTED EBITDA

(US$ in 000s, except percentages)

For the Six Months Ended June 30, 2021

⁽¹⁾ Distributions from non-consolidated affiliates includes (i) cash received for profit distributions from non-consolidated affiliates, and (ii) consideration from the sale of ownership interests in non-consolidated affiliates less contributions to date plus undistributed earnings (losses).

⁽²⁾ Other items, net includes items such as merger related costs, severance and other restructuring expenses. See Schedule 10 for a reconciliation of amounts.

⁽³⁾ Adjusted EBITDA is a non-GAAP financial measure, and as shown above it represents operating income (loss) plus depreciation and amortization, stock-based compensation, deferred acquisition consideration adjustments, distributions from non-consolidated affiliates, impairment and other items. See "Non-GAAP Financial Measures" herein.

Note: Actuals may not foot due to rounding.

SCHEDULE 5

MDC PARTNERS INC.

UNAUDITED RECONCILIATION OF NET INCOME (LOSS) TO ADJUSTED EBITDA

(US$ in 000s, except percentages)

For the Three Months Ended June 30, 2020

⁽¹⁾ Distributions from non-consolidated affiliates includes (i) cash received for profit distributions from non-consolidated affiliates, and (ii) consideration from the sale of ownership interests in non-consolidated affiliates less contributions to date plus undistributed earnings (losses).

⁽²⁾ Other items, net includes items such as merger related costs, severance and other restructuring expenses. See Schedule 10 for a reconciliation of amounts.

⁽³⁾ Adjusted EBITDA is a non-GAAP financial measure, and as shown above it represents operating income (loss) plus depreciation and amortization, stock-based compensation, deferred acquisition consideration adjustments, distributions from non-consolidated affiliates, impairment and other items. See "Non-GAAP Financial Measures" herein.

Note: Actuals may not foot due to rounding.

SCHEDULE 6

MDC PARTNERS INC.

UNAUDITED RECONCILIATION OF NET INCOME (LOSS) TO ADJUSTED EBITDA

(US$ in 000s, except percentages)

For the Six Months Ended June 30, 2020

⁽¹⁾ Distributions from non-consolidated affiliates includes (i) cash received for profit distributions from non-consolidated affiliates, and (ii) consideration from the sale of ownership interests in non-consolidated affiliates less contributions to date plus undistributed earnings (losses).

⁽²⁾ Other items, net includes items such as merger related costs, severance and other restructuring expenses. See Schedule 10 for a reconciliation of amounts.

⁽³⁾ Adjusted EBITDA is a non-GAAP financial measure, and as shown above it represents operating income (loss) plus depreciation and amortization, stock-based compensation, deferred acquisition consideration adjustments, distributions from non-consolidated affiliates, impairment and other items. See "Non-GAAP Financial Measures" herein.

Note: Actuals may not foot due to rounding.

SCHEDULE 7

MDC PARTNERS INC.

UNAUDITED RECONCILIATION OF NET INCOME (LOSS) TO COVENANT EBITDA

(US$ in 000s)

⁽¹⁾ Covenant EBITDA is a measure that includes pro forma adjustments for acquisitions, one-time charges, permitted dispositions and other adjustments, as defined in the Company's Credit Agreement. Covenant EBITDA is calculated as the aggregate of operating results for the rolling last twelve months (LTM). Each quarter is presented to provide the information utilized to calculate Covenant EBITDA. Historical Covenant EBITDA may be re-casted in the current period for any proforma adjustments related to acquisitions and/or dispositions in the current period. See "Non-GAAP Financial Measures" herein.

⁽²⁾ Other items, net includes items such as merger related costs, severance and other restructuring expenses. See Schedule 10 for a reconciliation of amounts.

⁽³⁾ Other adjustments, net primarily includes one-time professional fees and costs associated with real estate consolidation.

Note: Actuals may not foot due to rounding.

SCHEDULE 8

MDC PARTNERS INC.

UNAUDITED CONSOLIDATED BALANCE SHEETS

(US$ in 000s)

SCHEDULE 9

MDC PARTNERS INC.

UNAUDITED SUMMARY CASH FLOW DATA

(US$ in 000s)

Note: Actuals may not foot due to rounding.

SCHEDULE 10

MDC PARTNERS INC.

UNAUDITED RECONCILIATION OF COMPONENTS OF NON-GAAP MEASURES

(US$ in 000s)

Net revenue, primarily consisting of fees, commissions and performance incentives, represents the amount of our gross billings excluding billable expenses charged to a client. Net revenue of $298,368 (exclusive of billable expenses of $47,237) for the quarter ended June 30, 2021, increased from $231,911 (exclusive of billable expenses of $27,766) from the quarter ended June 30, 2020.

⁽¹⁾ Contribution to organic revenue represents the change in revenue, measured on a constant currency basis, relative to the comparable pre-acquisition period for acquired businesses that are included in the Company's organic revenue growth (decline) calculation.

⁽²⁾ Prior year revenue from dispositions reflects the incremental impact on revenue for the comparable period after the Company's disposition of such disposed business, plus revenue from each business disposed of by the Company in the previous year through the twelve month anniversary of the disposition.

Note: Actuals may not foot due to rounding.