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Madison Village Inc. (former Clarion Nursing Homes Limited) / Service Employees International Union, Local 1 Canada

2022–2026 · Health ? Social Services

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MAGRIS Talc Canada Inc., Micronizing Plant Timmins (Previously Imerys Talc Canada Inc.) / United Steel, Paper And Forestry, Rubber, Manufacturing, Energy, Allied Industrial And Service Workers International Union, Local 7580-01

2024–2028 · Manufacturing

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Main Street Terrace / Ontario Nurses' Association

2021–2024 · Health ? Social Services

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Main Street Terrace / Ontario Nurses' Association, Local 5

2024–2026 · Health ? Social Services

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Maitland Lewis Enterprises Limited / International Association Of Machinists And Aerospace WorkersAnd Its Automotive Lodge 2332

2022–2024 · Trade and Finance

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Maitland Lewis Enterprises Ltd. / International Association Of Machinists And Aerospace Workers, Local 2332

2024–2026 · Trade and Finance

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Maitland Manor / Ontario Nurses' Association

2024–2026 · Health ? Social Services

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Mammoet Canada Eastern Ltd. / International Union of Operating Engineers, Local 793

2025–2028 · Other Services

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Manitoulin Centennial Manor Home For The Aged / Ontario Nurses' Association

2023–2025 · Health ? Social Services

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Manitoulin Health Centre / Ontario Nurses' Association

2025–2027 · Health ? Social Services

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Manitoulin Lodge / Ontario Nurses' Association

2024–2026 · Health ? Social Services

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Manor Care Partners II operating as Friendly Manor Nursing Home / Health, Office and Professional Employees a division of United Food and Commercial Workers' Canada Local 175

2025–2026 · Health ? Social Services

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Mantor Landscape Limited / International Union of Operating Engineers, Local 793

2025–2028 · Construction

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Maple Leaf Sports & Entertainment Ltd. / United Food & Commercial Workers International Union, Local 333

2022–2025 · Other Services

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Maple Ridge Retirement Services, a division of Brown's Fine Food Services Inc. / United Food and Commercial Workers International Union, Local 175

2021–2024 · Health ? Social Services

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Marathon Underground Constructors Corporation / Labourers' International Union Of North America, Local 527

2022–2025 · Construction

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Marjorie House / Canadian Office & Professional Employees Union, Local 219

2020–2024 · Health ? Social Services

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Markhaven Home For The Aged / Service Employees International Union, Local 1 Canada

2024–2026 · Health ? Social Services

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Maryban Holdings Ltd (carrying on business as Oakwood Park Lodge, Niagara Falls) / Ontario Nurses' Association

2021–2024 · Health ? Social Services

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Maryban Holdings Ltd / Ontario Nurses' Association, Local 9

2024–2026 · Health ? Social Services

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Mascarin Collision Centre / International Association Of Machinists And Aerospace Workers, Thunder Bay Lodge 1120

2023–2026 · Other Services

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Mascioli Construction Company Limited / International Union of Operating Engineers, Local 793

2025–2030 · Construction

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Mase Contracting Ltd / Labourers' International Union of North America, Local 183

2022–2025 · Construction

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Mase Contracting Ltd. / Labourers' International Union of North America, Local 183

2025–2028 · Construction

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Mass Contracting Inc. / Labourers' International Union of North America, Local 183

2022–2025 · Construction

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Mass Contracting / Labourers' International Union of North America, Local 183

2025–2028 · Construction

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Mattel Canada Inc / International Union Of Allied, Novelty And Production Workers, Local 905

2022–2025 · Trade and Finance

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Matthews Equipment Ltd. o/a Herc Rentals / International Union of Operating Engineers, Local 793

2025–2028 · Other Services

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Mauser Canada Ltd. / United Steel, Paper And Forestry, Rubber, Manufacturing, Energy, Allied Industrial And Service Workers International Union, Local 16506-53

2024–2027 · Manufacturing

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Maviro Catalyst Canada Inc. / International Brotherhood Of Boilermakers, Iron Ship Builders, Blacksmiths, Forger And Helpers Local 128

2021–2024 · Construction

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