2025-10-30T03:54:24-00:00 2024-12-31 920460586 PwC US Tax LLP ONE NORTH WACKER DRIVE CHICAGO IL 60606 990 2024-01-01 364052298 McMASTER-CARR SUPPLY CO EMPLOYEES' WELFARE TRUST MCMA 6307823872 PO BOX 680 ELMHURST IL 60126 SETH EPSTEIN TRUSTEE 6307823872 2025-10-23 false NOLAN OGDEN P00845801 3122982000 2025-10-23 2024 2025-03-06 01:10:19Z SETH EPSTEIN 600 COUNTY LINE ROAD ELMHURST IL 60126 273766532 false X X 1995 IL TO PROVIDE HEALTH INSURANCE, TERM LIFE INSURANCE AND LONG TERM DISABILITY BENEFITS TO ELIGIBLE EMPLOYEES AND RETIREES OF McMASTER-CARR SUPPLY COMPANY 4 0 0 57128402 53699497 0 96313274 100392739 43549412 57128402 0 139862686 157521141 0 91452108 94952444 0 0 0 16621105 20710022 108073213 115662466 31789473 41858675 464709156 531426909 6409467 5989425 458299689 525437484 TO FUND HEALTH INSURANCE OBLIGATIONS OF McMASTER-CARR SUPPLY CO. false false 100392739 100392739 TO FUND HEALTH INSURANCE OBLIGATIONS OF McMASTER-CARR SUPPLY CO. 100392739 false false false false false false false false false false false false false true true true false false false false false false false false false false false false false false false false false false false false false false false false true false false true 0 0 true 0 true true false false false false false false false X 4 0 true true false false false false false true true false false true false false false false false false X SETH EPSTEIN 6307823872 600 COUNTY LINE ROAD ELMHURST IL 60126 X J A DELANEY TRUSTEE 000.01 040.00 X 0 0 0 R O DELANEY JR TRUSTEE 000.01 040.00 X 0 0 0 S EPSTEIN TRUSTEE 000.01 040.00 X 0 0 0 JACK DELANEY TRUSTEE 000.01 040.00 X 0 0 0 false false false United Healthcare 2310 Parklake Dr NE Atlanta GA 30345 Third-Party Healthcare Administrator 3236014 Express Script One Express Way Saint Louis MO 63121 Pharmacy Benefit Management 954651 Spring Health 60 Madison Ave Floor 2 New York NY 10010 Mental Healthcare and Wellbeing Support 513369 Mercer 155 North Wacker Drive Suite 1500 Chicago IL 60606 Consulting Services 279977 Delta Dental 1515 W 22nd St Suite 450 Oak Brook IL 60523 Dental Claims Administrator 187882 6 BENEFITS 900099 90222237 90222237 PHARMACY REBATES 900099 10170502 10170502 100392739 11373820 11373820 161999973 116245391 45754582 45754582 45754582 157521141 100392739 57128402 0 0 0 94952444 94952444 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 THIRD PARTY ADMINISTRATION FEE 5440295 5440295 UNRELATED BUSINESS INCOME TAX 15269727 15269727 0 115662466 100392739 15269727 2403889 3155465 273546 685878 755805 424082 460818789 526688076 457127 473408 464709156 531426909 2591728 1109959 3817739 4879466 6409467 5989425 X 458299689 525437484 458299689 525437484 464709156 531426909 41858675 25279120 X false true X true false false Financial derivatives and other financial products Closely-held equity interests 1451660 Federal income taxes 1451660 State income taxes 3427806 4879466 X 182800261 25279120 25279120 157521141 157521141 115662466 115662466 115662466 X 2 Accounting principles generally accepted in the United States of America require plan 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. There are no uncertain positions taken or expected to be taken that would require recognition of a liability or disclosure in the financial statements as of December 31, 2024 and 2023.The Plan is subject to routine audits by taxing jurisdictions however, there are currently no audits for any tax periods in progress. The Plan administrator believes it is no longer subject to income tax examinations for years prior to 2021. Form 990, Part VI, Section A, Line 2 J.A. DELANEY, R.O. DELANEY, JR., AND JACK DELANEY ARE RELATED. ALL FOUR TRUSTEES ARE OFFICERS OF THE PLAN SPONSOR, McMASTER-CARR SUPPLY COMPANY. Form 990, Part VI, Section A, Line 3 THE TRUSTEES HAVE DELEGATED THE PAYMENT OF MEDICAL, DENTAL, VISION AND PHARMACEUTICAL CLAIMS TO A THIRD PARTY ADMINISTRATOR. PAYMENT OF THESE TYPES OF CLAIMS BY A THIRD PARTY ADMINISTRATOR IS APPROPRIATE GIVEN THE NATURE AND PRIVACY OF MEDICAL CLAIMS. Form 990, Part VI, Section A, Line 8 THE TRUSTEES MEET WITH THE INDEPENDENT INVESTMENT MANAGER NOT LESS THAN THREE TIMES A YEAR TO REVIEW THE INVESTMENT RESULTS OF THE TRUST. EMPLOYEES OF THE PLAN SPONSOR, UNDER THE DIRECTION OF ONE OF THE TRUSTEES, MEET WITH BENEFIT CONSULTANTS TO ENSURE THAT THE THIRD PARTY ADMINISTRATORS ARE COMPLYING WITH PLAN DOCUMENTS. Form 990, Part VI, Section B, Line 11B FORM 990 IS REVIEWED BY PRICEWATERHOUSECOOPERS LLP, THE EXTERNAL AUDITOR PRIOR TO FILING. THE RETURN PREPARER SHARES A COPY OF FORM 990 WITH EACH TRUSTEE VIA EMAIL BEFORE FILING. Form 990, Part VI, Section C, Line 19 THE PLAN SPONSOR IS A PRIVATELY HELD CORPORATION. THE TRUST DOES NOT MAKE ITS GOVERNING DOCUMENTS OR ITS CONFLICT OF INTEREST POLICY AVAILABLE TO THE PUBLIC. THE TRUSTS FINANCIAL STATEMENTS ARE AVAILABLE TO THE PUBLIC VIA THIS FORM 990 AND THE PLAN SPONSORS FORM 5500. McMASTER-CARR SUPPLY CO 600 COUNTY LINE ROAD ELMHURST IL 60126 361458720 DISTRIBUTION IL NA C Corp false false false false false false false false false false false false false false true true false false false false