BLACK DIAMOND STRATEGIES LLC

• THE ASSOCIATION OF AMERICAN RAILROADS $480,000 7 filings
• MAMMOTH ENERGY SERVICES INC $440,000 6 filings
• TRANSCANADA PIPELINES USA LTD $240,000 6 filings
• FORWARD GLOBAL ON BEHALF OF VAPOR TECHNOLOGY ASSOCIATION $208,000 6 filings
• WING AVIATION LLC $80,000 2 filings
• TRANSPORTATION MANAGEMENT SERVICES $70,000 7 filings
• ON DEMAND PHARMACEUTICALS, INC. $50,000 3 filings
• CINTRA US $10,000 2 filings
• ATLAS STRATEGIC ASSETS INC. $0 5 filings

• HANS KLINGLER 4 filings · through 2026 U.S. House Chief of Staff (2010-2015), U.S. Senate Regional Director (1995-1997)
• CONNIE MACK IV 1 filing · through 2025 U.S. Representative (2005-2013)

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 $640,000 14 filings
• 2025 $938,000 30 filings

• Transportation 13
• Energy/Nuclear 11
• Health Issues 6
• Natural Resources 5
• Pharmacy 3
• Budget/Appropriations 1
• Homeland Security 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.

• HOUSE OF REPRESENTATIVES 31
• SENATE 30
• Food & Drug Administration (FDA) 2
• Health & Human Services, Dept of (HHS) 2