MAYER BROWN LLP

• FREEDOM HOLDING CORP $950,000 7 filings
• ONSEMI (ON SEMICONDUCTOR CORPORATION) $770,000 7 filings
• COALITION FOR REGULATED HFCS INC. $630,000 7 filings
• GALAXY DIGITAL HOLDINGS, LP $490,000 7 filings
• AT&T SERVICES INC $420,000 7 filings
• MICHELIN NORTH AMERICA, INC. $390,000 6 filings
• 21ST CENTURY PRIVACY COALITION $350,000 7 filings
• CTIA - THE WIRELESS ASSOCIATION $350,000 7 filings
• UNITED STATES STEEL CORPORATION $320,000 7 filings
• IFM INVESTORS PTY LTD. $300,000 7 filings
• SUNIVA, INC. $300,000 7 filings
• MEDLINE INDUSTRIES, L.P. (FORMERLY MEDLINE INDUSTRIES, INC.) $250,000 7 filings
• ITO EN (NORTH AMERICA) INC. $220,000 6 filings
• HEALTH CARE ALLIANCE FOR PATIENT SAFETY $210,000 7 filings
• STARR INSURANCE HOLDINGS, INC. $210,000 7 filings
• ELEMENT ELECTRONICS $200,000 7 filings
• PRIMEMAX MEDICAL INDUSTRIES, INC. $160,000 5 filings
• U.S. VENTURE, INC. (FORMERLY U.S. OIL) $160,000 6 filings
• VERIZON COMMUNICATIONS INC AND VARIOUS SUBSIDIARIES $150,000 6 filings
• VOLVO CAR CORPORATION $150,000 4 filings
• SOLONIAN RESOURCES, LLC $130,000 5 filings
• COINBASE, INC. $120,000 7 filings
• OURARING INC. $120,000 7 filings
• NOVOCURE $100,000 5 filings
• LIVE NATION ENTERTAINMENT, INC. $60,000 7 filings
• HUNTSMAN CORPORATION $50,000 7 filings
• SYENSQO USA LLC $50,000 5 filings
• ARISTA NETWORKS, INC. $40,000 7 filings
• WAUPACA FOUNDRY, INC. $40,000 2 filings
• PENN ALUMINUM INTERNATIONAL LLC $30,000 2 filings
• UBER TECHNOLOGIES, INC. $30,000 7 filings
• WEBB WHEEL PRODUCTS, INC. $30,000 5 filings
• RABO AGRIFINANCE LLC $20,000 3 filings
• THE BASIC FUND $20,000 2 filings
• ABBOTT LABORATORIES $10,000 7 filings
• AMERICAN EXPRESS $10,000 8 filings
• CHUBB INA HOLDINGS, INC. (FORMERLY ACE INA HOLDINGS, INC.) $10,000 7 filings
• SECURITY INDUSTRY ASSOCIATION $10,000 7 filings
• SOUTHWIRE COMPANY, LLC $10,000 7 filings
• SWISS BANKERS ASSOCIATION $10,000 5 filings
• VISA INC. $10,000 7 filings
• ALUMINUM EXTRUDERS COUNCIL $0 1 filing
• GLOBALFOUNDRIES U.S. INC. $0 1 filing
• MEC AERIAL WORK PLATFORMS $0 7 filings
• RAZOR USA LLC $0 6 filings
• SABIN METAL CORPORATION $0 2 filings
• SHIPPING TAXATION COALITION (INFORMAL COALITION) $0 7 filings
• SONOS INC. $0 7 filings
• US CHAMBER OF COMMERCE $0 2 filings

Ranked by reported money. 59 clients in total.

• DANIEL HARDER 17 filings · through 2026 Staff Assistant/Clerk - House Ways and Means 2014; Legislative Director -Rep. Mike Bishop 2015-2018
• WARREN PAYNE 13 filings · through 2026 U.S. Intl Comm: Trade Analyst, 2002-04; Economic Advisor; 2007-07; House Ways and Means Committee; Trade Economist, 2007-09; Sr. Economist/Trade Advisor 2009-1…
• TIMOTHY J KEELER ESQ 7 filings · through 2026 USTR, Chief of Staff, 2006-2009 US Treasury Department, Deputy to the Assistant Secretary of Legislative Affairs, 2001-2006 Presidential Transition Team, Polic…
• JESSICA WOOLLEY 2 filings · through 2025 Legislative Assistant to Reps. Bean, Schuler, Loebsack, Hill and Obey.
• JONATHAN BECKER 2 filings · through 2026 Chief of Staff, Senator Amy Klobuchar (2010-13); Chief Counsel, Senator Amy Klobuchar (2007-09).
• HOWARD W WALTZMAN 1 filing · through 2025 1996-01: General Counsel, Sen. Sam Brownback; 2001-04: Tel Counsel, US House Energy/Commerce Comm; 2004-06: Chief Counsel, Telecom and Internet Subcommitee.

A lobbyist who previously held a covered government position must disclose it. We flag the ones whose name resolves to a member of Congress and link the ones still in our roster. The revolving door collects them across every firm.

• 2026 $3,260,000 139 filings
• 2025 $4,630,000 190 filings

• Trade (domestic/foreign) 90
• Taxation/Internal Revenue Code 61
• Telecommunications 28
• Health Issues 14
• Transportation 10
• Consumer Issues/Safety/Products 9
• Chemicals/Chemical Industry 7
• Financial Institutions/Investments/Securities 7
• Foreign Relations 7
• Insurance 7
• Manufacturing 6
• Energy/Nuclear 5
• Government Issues 5
• Natural Resources 5
• Tariff (miscellaneous tariff bills) 5
• Banking 1
• Medical/Disease Research/Clinical Labs 1

The count is how many filings named that issue area. A filing reports one lump figure covering every issue on it, so the money above cannot be split between them.

• SENATE 167
• HOUSE OF REPRESENTATIVES 159
• U.S. Trade Representative (USTR) 28
• Commerce, Dept of (DOC) 18
• Treasury, Dept of 12
• Environmental Protection Agency (EPA) 7
• State, Dept of (DOS) 6
• Executive Office of the President (EOP) 5
• Labor, Dept of (DOL) 5
• White House Office 5
• Food & Drug Administration (FDA) 3
• Natl Economic Council (NEC) 2
• Natl Security Council (NSC) 2
• Energy, Dept of 1
• Securities & Exchange Commission (SEC) 1