| SAC & FOX TRIBE OF THE MISSISSIPPI IN IOWA | CORNERSTONE GOVERNMENT AFFAIRS, INC. | Q3 2026 | Indian/Native American Affairs, Budget/Appropriations |
| PONCA TRIBE OF NEBRASKA | CORNERSTONE GOVERNMENT AFFAIRS, INC. | Q3 2026 | Transportation, Gaming/Gambling/Casino, Indian/Native American Affairs |
| HABERMATOLEL POMO OF UPPER LAKE TRIBE | CORNERSTONE GOVERNMENT AFFAIRS, INC. | Q3 2026 | Economics/Economic Development, Transportation, Indian/Native American Affairs |
| PLAN INTERNATIONAL, USA OBO MODERNIZING FOREIGN ASSISTANCE | CORNERSTONE GOVERNMENT AFFAIRS, INC. | Q2 2026 | Budget/Appropriations |
| NATIONAL WASTE & RECYCLING ASSOCIATION | CORNERSTONE GOVERNMENT AFFAIRS, INC. | Q1 2026 | Environment/Superfund, Waste (hazardous/solid/interstate/nuclear) |
| INTERNATIONAL ORGANIZATION FOR MIGRATION | CORNERSTONE GOVERNMENT AFFAIRS, INC. | Q1 2026 | Foreign Relations, Budget/Appropriations |
| GARMIN INTERNATIONAL, INC. | CORNERSTONE GOVERNMENT AFFAIRS, INC. | Q2 2025 | Trucking/Shipping, Defense, Taxation/Internal Revenue Code |
| YAYASAN BERBAKTI SEMANGAT INDONESIA | CORNERSTONE GOVERNMENT AFFAIRS, INC. | Q2 2025 | Economics/Economic Development, Trade (domestic/foreign), Foreign Relations |
| SEMINOLE TRIBE OF FLORIDA | CORNERSTONE GOVERNMENT AFFAIRS, INC. | Q2 2025 | Indian/Native American Affairs |