| CUBIC CORPORATION | SAN DIEGO | CA | 1 | 2026-05-17 |
| CSX CORPORATION | Washington | DC | 1 | 2026-05-17 |
| CSS PARTNERS, LLC | Oklahoma City | OK | 7 | 2026-05-17 |
| CSPI ACTION FUND | Washington | DC | 1 | 2026-05-17 |
| CSA STRATEGY GROUP LLC (FORMERLY CSA STRATEGIES LLC) | Naples | FL | 2 | 2026-05-17 |
| CRYPTO COUNCIL FOR INNOVATION | San Francisco | CA | 1 | 2026-05-17 |
| CRUISE LINES INTERNATIONAL ASSOCIATION | Washington | DC | 1 | 2026-05-17 |
| CRUCE CAPITOL CONSULTING LLC | Alexandria | VA | 1 | 2026-05-17 |
| CROWELL GLOBAL ADVISORS | WASHINGTON | DC | 7 | 2026-05-17 |
| CROWELL & MORING LLP | Washington | DC | 4 | 2026-05-17 |
| CROWE LLP | Washington | DC | 1 | 2026-05-17 |
| CROSSWINDS SOLUTIONS | Washington | DC | 7 | 2026-05-17 |
| CROSSROADS TREATMENT CENTERS | Greenville | SC | 1 | 2026-05-17 |
| CROSSROADS STRATEGIES, LLC | Washington | DC | 37 | 2026-05-17 |
| CROSS POTOMAC CONSULTING LLC | Ave Maria | FL | 2 | 2026-05-17 |
| CROHN'S & COLITIS FOUNDATION | New York | NY | 1 | 2026-05-17 |
| CREST HILL ADVISORS LLC | Washington | DC | 18 | 2026-05-17 |
| CRESCO LABS LLC | Chicago | IL | 1 | 2026-05-17 |
| CREDIT UNION NATIONAL ASSOCIATION. INC. DBA AMERICA'S CREDIT UNIONS | WASHINGTON | DC | 1 | 2026-05-17 |
| CRANFILL SUMNER LLP | Raleigh | NC | 2 | 2026-05-17 |
| CRAFTWORK GOVERNMENT AFFAIRS | Nashville | TN | 3 | 2026-05-17 |
| CR FEDERAL | Washington | DC | 4 | 2026-05-17 |
| COZEN O'CONNOR PUBLIC STRATEGIES | Washington | DC | 21 | 2026-05-17 |
| COVINO SMITH & SIMON, INC. (FORMERLY SIMON AND COMPANY, INC.) | Washington | DC | 1 | 2026-05-17 |
| COVINGTON & BURLING LLP | Washington | DC | 22 | 2026-05-17 |
| COVENANT GOVERNMENT AFFAIRS, LLC | Pensacola | FL | 68 | 2026-05-17 |
| COVE STRATEGIES | Alexandria | VA | 2 | 2026-05-17 |
| COUPANG, INC. | Seattle | WA | 1 | 2026-05-17 |
| COUNCIL ON STATE TAXATION | WASHINGTON | DC | 1 | 2026-05-17 |
| COUNCIL ON FOUNDATIONS | Washington | DC | 1 | 2026-05-17 |
| COUNCIL OF PRODUCERS AND DISTRIBUTORS OF AGROTECHNOLOGY | Arlington | VA | 1 | 2026-05-17 |
| COUNCIL OF INSTITUTIONAL INVESTORS | Washington D.C | DC | 2 | 2026-05-17 |
| COUNCIL OF INDUSTRIAL BOILER OWNERS | Haymarket | VA | 1 | 2026-05-17 |
| COUNCIL FOR CITIZENS AGAINST GOVERNMENT WASTE | WASHINGTON | DC | 1 | 2026-05-17 |
| COSGROVE JONHENRY, LLC | Columbus | OH | 1 | 2026-05-17 |
| CORRIGAN & USSERY LLC | Burke | VA | 22 | 2026-05-17 |
| CORRIDOR 67, INC. | TRENTON | NJ | 2 | 2026-05-17 |
| CORPORATION FOR SUPPORTIVE HOUSING | New York | NY | 1 | 2026-05-17 |
| CORNERSTONE GOVERNMENT AFFAIRS, INC. | Washington | DC | 484 | 2026-05-17 |
| COREWELL HEALTH | Grand Rapids | MI | 1 | 2026-05-17 |
| COREWEAVE, INC. | Livingston | NJ | 1 | 2026-05-17 |
| CORDONE CONSULTING LLC | Hilton Head Island | SC | 3 | 2026-05-17 |
| CORCORAN STRATEGIES GROUP | Washington | DC | 3 | 2026-05-17 |
| CORCORAN & ASSOCIATES, INC. DBA CORCORAN PARTNERS | Land O' Lakes | FL | 76 | 2026-05-17 |
| CORBIN STRATEGIES LLC | Washington | DC | 3 | 2026-05-17 |
| COPYRIGHT ALLIANCE | Washington | DC | 1 | 2026-05-17 |
| COPPER HILL STRATEGIES, LLC | Phoenix | AZ | 1 | 2026-05-17 |
| COORSTEK, INC. | Golden | CO | 1 | 2026-05-17 |
| COOK INLET SPILL PREVENTION AND RESPONSE, INC. | Kenai | AK | 1 | 2026-05-17 |
| CONWAY CAPITOL CONSULTING LLC | Washington | DC | 2 | 2026-05-17 |
| CONVERGENCE STRATEGIES, LLC | Bethesda | MD | 4 | 2026-05-17 |
| CONVERGE PUBLIC STRATEGIES | MIAMI | FL | 30 | 2026-05-17 |
| CONTROL AI US, INC. | Washington DC | DC | 1 | 2026-05-17 |
| CONTINENTAL STRATEGY, LLC | Washington | DC | 148 | 2026-05-17 |
| CONSUMER HEALTHCARE PRODUCTS ASSOCIATION | WASHINGTON | DC | 1 | 2026-05-17 |
| CONSUMER BANKERS ASSOCIATION | WASHINGTON | DC | 1 | 2026-05-17 |
| CONSTANTINOPLE & VALLONE CONSULTING LLC | NY | NY | 11 | 2026-05-17 |
| CONSILIUM CONSULTING | Phoenix | AZ | 4 | 2026-05-17 |
| CONSENSUS COMMUNICATIONS, INC. | ORLANDO | FL | 1 | 2026-05-17 |
| CONNICK AND ASSOCIATES | New Orleans | LA | 6 | 2026-05-17 |
| CONNECTOR INC. | Frisco | TX | 6 | 2026-05-17 |
| CONNECTIONS HEALTH SOLUTIONS | Phoenix | AZ | 1 | 2026-05-17 |
| CONGRESSIONAL SOLUTIONS, INC (CSI) | ARLINGTON | VA | 3 | 2026-05-17 |
| CONGRESSIONAL FIRE SERVICES INSTITUTE | Arlington | VA | 1 | 2026-05-17 |
| CONGRESSIONAL COLLEAGUES, LLC | Aldie | VA | 2 | 2026-05-17 |
| CONGRESS OF NEUROLOGICAL SURGEONS | Washingon | DC | 1 | 2026-05-17 |
| CONFRERE STRATEGIES, LLC | Washington | DC | 2 | 2026-05-17 |
| CONFLUENCE WASHINGTON STRATEGIES, LLC | Bethesda | MD | 1 | 2026-05-17 |
| CONFIDENT STRATEGY GROUP LLC | New York | NY | 2 | 2026-05-17 |
| CONCERNED WOMEN FOR AMERICA LEGISLATIVE ACTION COMMITTEE | Alexandria | VA | 1 | 2026-05-17 |
| COMPUTER & COMMUNICATIONS INDUSTRY ASSOCIATION | Washington | DC | 1 | 2026-05-17 |
| COMPETITIVE CARRIERS ASSOCIATION | Washington | DC | 1 | 2026-05-17 |
| COMPASSION AND CHOICES | Littleton | CO | 1 | 2026-05-17 |
| COMPASS GOVERNMENT RELATIONS PARTNERS, LLC | Annapolis | MD | 2 | 2026-05-17 |
| COMPASS CONSULTING GROUP, LLC | WASHINGTON | DC | 2 | 2026-05-17 |
| COMMUNITY ONCOLOGY ALLIANCE | Washington | DC | 1 | 2026-05-17 |
| COMMUNITY BANKERS ASSOCIATION OF ILLINOIS | Springfield | IL | 1 | 2026-05-17 |
| COMMONWEALTH FUSION SYSTEMS | Devens | MA | 1 | 2026-05-17 |
| COMMON CAUSE | WASHINGTON | DC | 1 | 2026-05-17 |
| COMMODITY MARKETS COUNCIL | WASHINGTON | DC | 2 | 2026-05-17 |
| COMMITTEE ON INVESTMENT OF EMPLOYEE BENEFIT ASSETS INC. | Washington | DC | 2 | 2026-05-17 |
| COMMERCIAL VEHICLE SAFETY ALLIANCE | Washington | DC | 2 | 2026-05-17 |
| COMMERCIAL METALS COMPANY - CMC | Irving | TX | 1 | 2026-05-17 |
| COMBEST, SELL & ASSOCIATES, LLC | Lubbock | TX | 13 | 2026-05-17 |
| COLUMBIA STRATEGIC COUNSEL | Washington | DC | 3 | 2026-05-17 |
| COLUMBIA RIVERKEEPER | Hood River | OR | 3 | 2026-05-17 |
| COLORADO SPRINGS UTILITIES | Colorado Springs | CO | 1 | 2026-05-17 |
| COLORADO SCHOOL OF MINES | Golden | CO | 1 | 2026-05-17 |
| COLLEGE OF WILLIAM & MARY | Williamsburg | VA | 1 | 2026-05-17 |
| COLLEGE BOARD (FKA THE COLLEGE ENTRANCE EXAMINATION BOARD) | Reston | VA | 1 | 2026-05-17 |
| COLLECTIVE STRATEGIES & COMMUNICATIONS | Washington | DC | 22 | 2026-05-17 |
| COIN CENTER INC. | Washington | DC | 2 | 2026-05-17 |
| COHERUS BIOSCIENCES, INC. | Redwood City | CA | 1 | 2026-05-17 |
| COGENT STRATEGIES LLC | Washington | DC | 2 | 2026-05-17 |
| COBANK, ACB | Greenwood Village | CO | 1 | 2026-05-17 |
| COALITION OF AIRLINE PILOTS ASSOCIATIONS | Washington | DC | 1 | 2026-05-17 |
| COALITION FOR RESPONSIBLE WASTE INCINERATION | Ashburn | VA | 1 | 2026-05-17 |
| COALITION FOR DEEP SPACE EXPLORATION | Washington | DC | 1 | 2026-05-17 |
| COALITION FOR AMERICA'S GATEWAYS & TRADE CORRIDORS | WASHINGTON | DC | 2 | 2026-05-17 |
| COACH USA | Paramus | NJ | 1 | 2026-05-17 |