BLACK DIAMOND STRATEGIES LLC

• MAMMOTH ENERGY SERVICES INC $560,000 7 filings
• THE ASSOCIATION OF AMERICAN RAILROADS $560,000 8 filings
• FORWARD GLOBAL ON BEHALF OF VAPOR TECHNOLOGY ASSOCIATION $258,000 7 filings
• TRANSCANADA PIPELINES USA LTD $240,000 7 filings
• WING AVIATION LLC $160,000 3 filings
• TRANSPORTATION MANAGEMENT SERVICES $70,000 8 filings
• ON DEMAND PHARMACEUTICALS, INC. $50,000 3 filings
• CINTRA US $10,000 2 filings
• ATLAS STRATEGIC ASSETS INC. $0 6 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 $970,000 21 filings
• 2025 $938,000 30 filings

• Transportation 15
• Energy/Nuclear 13
• Health Issues 7
• Natural Resources 6
• 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 37
• SENATE 36
• Food & Drug Administration (FDA) 2
• Health & Human Services, Dept of (HHS) 2
• White House Office 1