MDC Partners Inc

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MDC Partners Inc
TickerSTGW
CIK #0000876883
CUSIP85256A109
SectorTrade & Services - Services-Advertising Agencies
Address745 Fifth Avenue, 19th Floor, New York, NY 10151
Source [EDGAR]
CIK Filing 2011 - 2026
[0000876883] 10-K
[0000876883] 10-Q
[0000876883] 3
[0000876883] 4
[0000876883] 5
[0000876883] 8-K
[0000876883] SC 13D
[0000876883] SC 13G
Form 13D/13G Filer Form 13D/13G Subject Filed % Owned
Ballmer Steven A Stagwell Inc [2025-04-25] 0.0
American Beacon Advisors Inc Stagwell Inc [2024-02-28] 0.0
BlackRock Inc Stagwell Inc [2024-01-31] 5.3
AlpInvest Partners BV Stagwell Inc [2023-05-10] 0.9
Hotchkis & Wiley Capital Management LLC Stagwell Inc [2023-02-14] 5.83
Indaba Capital Management LP Stagwell Inc [2021-09-07] 12.1
Indaba Capital Management LP MDC Partners Inc [2021-05-27] 11.9
Madison Avenue Partners LP MDC Partners Inc [2021-02-16] 5.3
Stagwell Group LLC MDC Partners Inc [2019-03-25] 19.9
Indaba Capital Management LP MDC Partners Inc [2019-02-14] 7.5
BlackRock Inc MDC Partners Inc [2019-02-08] 5.1
Schroder Investment Management North America INC/ de MDC Partners Inc [2019-02-07] 5.284
FrontFour Capital Group LLC MDC Partners Inc [2018-11-28] 5.1
Hotchkis & Wiley Capital Management LLC MDC Partners Inc [2018-07-10] 10.96
Goldman Sachs Group Inc MDC Partners Inc [2017-03-15] 14.72
Hotchkis & Wiley Capital Management LLC MDC Partners Inc [2017-02-10] 7.43
Cardinal Capital Management LLC /CT MDC Partners Inc [2016-02-12] 5.2
Invesco Ltd MDC Partners Inc [2015-09-10] 10.6
Roystone Capital Management LP MDC Partners Inc [2014-05-29] 5.7
[2013-02-14] None
Gruber & McBaine Capital Management LLC MDC Partners Inc [2013-02-12] 0.0
Cooperman Leon G MDC Partners Inc [2013-02-08] 6.7
Cooperman Leon G MDC Partners Inc [2013-02-07] 6.7
Robeco Investment Management Inc MDC Partners Inc [2013-02-07] 6.64
Gruber & McBaine Capital Management LLC MDC Partners Inc [2012-02-07] 3.4
Form 3/4/5 Filer 2011 - 2026
Vaughan Brandt A
Stagwell Inc
Samaha Eli
Simon Irwin D
Barshefsky Charlene
Oosterman Wade
Rogers Desiree G
Slater Rodney E
Penn Mark Jeffery
Gross Bradley J
McElligott Peter
Leveton Jay
Greene Ryan
Lanuto Frank P
Polpat LLC
Ballmer Steven A
Dimaggio Vincenzo
StoneBridge 2017 Offshore LP
Goldman Sachs & Co LLC
Bridge Street Opportunity Advisors LLC
StoneBridge 2017 LP
Broad Street Principal Investments LLC
Goldman Sachs Group Inc
AlpInvest Partners BV
AlpInvest Partners US Secondary Investments 2016 I CV
AlpInvest Secondaries Fund VI CV
AlpInvest Secondaries Fund Euro VI CV
GGG US Secondary 2017 CV
AlpInvest PEP Secondary 2017 CV
APSS Secondary CV
AG Secondary CV
AlpInvest GA Secondary CV
AJ Secondary CV
AP Fondo Secondaries II CV
Indaba Capital Management LP
IC GP LLC
Schrier Derek C
Ross David Corwin
Mirsky Jonathan B
Daniere Asha
Goldberg Daniel Steven
Gardner Seth
O'Donovan Anne Marie
Stagwell Agency Holdings LLC
Stagwell Group LLC
Gendel Mitchell
Kauffman Scott L
Doft David B
Copeland Clare
Kantor Robert Andrew
Kramer Lawrence S
Kirby Michael JL
Coste Andre Clement
Nadal Miles
Sabatino Michael
Senecal Lori Ann
Kamerschen Robert
Davidson Thomas N
Pustil Stephen
Swartzman Gavin
Dabill David
Insider Transaction (Form 3/4/5) Date Action Shares Price Value ($)
Leveton Jay
Class A Common Stock
2026-03-11 Disposed to issuer 664,754 $6.17 4,101,532
Penn Mark Jeffery
Class A Common Stock
2026-03-11 Disposed to issuer 4,572,207 $6.17 28,210,517
Greene Ryan
Class A Common Stock
2026-03-11 Disposed to issuer 403,717 $6.17 2,490,934
Lanuto Frank P
Class A Common Stock
2026-03-11 Disposed to issuer 40,534 $6.17 250,095
Leveton Jay
Class A Common Stock
2026-03-07 Tax withheld 44,230 $5.24 231,765
McElligott Peter
Class A Common Stock
2026-03-07 Tax withheld 8,512 $5.24 44,603
Penn Mark Jeffery
Class A Common Stock
2026-03-07 Tax withheld 75,447 $5.24 395,342
Greene Ryan
Class A Common Stock
2026-03-07 Tax withheld 9,359 $5.24 49,041
Lanuto Frank P
Class A Common Stock
2026-03-07 Tax withheld 16,208 $5.24 84,930
McElligott Peter
Class A Common Stock
2026-03-03 Disposed to issuer 1,831 $0.00
Leveton Jay
Class A Common Stock
2026-03-03 Tax withheld 60,467 $4.82 291,451
Lanuto Frank P
Class A Common Stock
2026-03-03 Tax withheld 45,534 $4.82 219,474
Greene Ryan
Class A Common Stock
2026-03-03 Disposed to issuer 4,513 $0.00
Leveton Jay
Class A Common Stock
2026-03-03 Disposed to issuer 11,855 $0.00
McElligott Peter
Class A Common Stock
2026-03-03 Tax withheld 10,121 $4.82 48,783
Penn Mark Jeffery
Class A Common Stock
2026-03-03 Tax withheld 229,529 $4.82 1,106,330
Penn Mark Jeffery
Class A Common Stock
2026-03-03 Disposed to issuer 57,689 $0.00
Lanuto Frank P
Class A Common Stock
2026-03-03 Disposed to issuer 12,264 $0.00
Greene Ryan
Class A Common Stock
2026-03-03 Tax withheld 21,405 $4.82 103,172
Samaha Eli
Class A Common Stock
2026-01-02 Grant 4,090 $4.89 20,000
showing 20 of 200 most recent transactions
13F Ownership Over TimeHoldersShares Held
2026-03-31 183 104,385,475
2025-12-31 171 93,801,920
2025-09-30 163 97,761,378
2025-06-30 157 98,510,769
2025-03-31 171 92,545,963
2024-12-31 163 91,555,235
2024-09-30 147 91,301,034
2024-06-30 131 93,299,539
2024-03-31 135 96,623,117
2023-12-31 143 96,032,084
2023-09-30 140 94,325,312
2023-06-30 133 95,672,504
Form 13F Holdings
Firm Period DFND Voting Shares
Cidel Asset Management Inc [2026-06-30] SOLE 1,878,426 1,878,426
Net Worth Advisory Group [2026-06-30] SOLE 41,464 41,465
Alaska Retirement Management Board [2026-06-30] SOLE 33,060 33,060
Wealth Enhancement Advisory Services LLC [2026-06-30] SOLE 1,268 17,903
Schmeidler A R & Co Inc [2026-06-30] SOLE 14,597 14,597
B Riley Wealth Advisors Inc [2026-06-30] SOLE 10,000 10,000
IFP Advisors LLC [2026-06-30] SOLE 740 740
Farther Finance Advisors LLC [2026-06-30] SOLE 0 339
Gamma Investing LLC [2026-06-30] DFND 235 235
True Wealth Design LLC [2026-06-30] SOLE 0 134
Versant Capital Management Inc [2026-06-30] SOLE 51 51
Dinuzzo Private Wealth Inc [2026-06-30] SOLE 0 4
JFS Wealth Advisors LLC [2026-06-30] SOLE 0 1
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