Lobbying firms
Every registrant in the lobbying register: firms that lobby for clients, organizations that register to lobby for themselves, and self-employed lobbyists.
12,255
registrants, A to Z
| Firm | Location | Years active |
|---|---|---|
| ODONNELL & SON LLC | Washington, DC | Active 2016–2026 |
| OFF HILL STRATEGIES L.L.C. | St. Petersburg, FL | Active 2014–2026 |
| OFFENSIVE SECURITY SERVICES, LLC | New York, NY | Active 2022 |
| OFFICE OF SAM PATTEN LLC | Washington, DC | Active 2016–2018 |
| OFFICE OF THE COMMISSIONER AN IGO | New York, NY | Active 2020–2021 |
| OFFICE OF THE COMMISSIONER OF BASEBALL | WASHINGTON, DC | Active 2015–2026 |
| OFFSHORE MARINE SERVICE ASSOCIATION | New Orleans, LA | Active 2007–2026 |
| OGILVY PUBLIC RELATIONS WORLDWIDE | Washington, DC | Active 2007–2013 |
| OGLETHORPE POWER CORPORATION | TUCKER, GA | Active 2007–2026 |
| OGLETHORPE PUBLIC AFFAIRS GROUP, INC. | Augusta, GA | Active 2009–2026 |
| OGLETREE GOVERNMENTAL AFFAIRS, INC. | Washington, DC | Active 2007–2015 |
| OGR | Washington, DC | Active 2007–2026 |
| OH STRATEGIC COMMUNICATIONS | Phoenix, AZ | Active 2015–2017 |
| OHANLON, G JOHN | KENNEBUNK, ME | Active 2007 |
| OHIO CHAMBER OF COMMERCE | Columbus, OH | Active 2022–2026 |
| OHIO CORN AND WHEAT GROWERS ASSOCIATION | Delaware, OH | Active 2016–2019 |
| OHIO FARM BUREAU FEDERATION | Columbus, OH | Active 2008–2026 |
| OHIO HOSPITAL ASSOCIATION | COLUMBUS, OH | Active 2007–2026 |
| OHIO MUNICIPAL ELECTRIC ASSOCIATION | COLUMBUS, OH | Active 2007–2026 |
| OHIO NATIONAL GUARD ASSOCIATION | Columbus, OH | Active 2013–2015 |
| OHIO RIVER SOUTH, INC. | Atlanta, GA | Active 2024 |
| OHRENSTEIN & BROWN, LLP | New York, NY | Active 2015–2017 |
| OIL COMPANIES INTERNATIONAL MARINE FORUM | London, United Kingdom | Active 2007–2026 |
| OKLAHOMA STATE UNIVERSITY | STILLWATER, OK | Active 2020–2023 |
| OKLO INC. | Santa Clara, CA | Active 2024–2026 |
| OKTA, INC. | San Francisco, CA | Active 2022–2024 |
| OLD COLONY CAPITAL, LLC | Sharon, MA | Active 2024 |
| OLD DOMINION FREIGHT LINE, INC. | Thomasville, NC | Active 2011–2015 |
| OLD DOMINION UNIVERSITY | Norfolk, VA | Active 2022–2026 |
| OLD NORTH STRATEGIES, LLC | Kings Mountain, NC | Active 2021–2026 |
| OLD RHINE, LLC | Norman, OK | Active 2023–2026 |
| OLD TOWN CREEK CONSULTING | Paris, TN | Active 2012–2014 |
| OLDAKER & WILLISON, LLP | Washington, DC | Active 2007–2026 |
| OLDAKER GROUP, LLC | WASHINGTON, DC | Active 2009–2014 |
| OLDCASTLE MATERIALS INC | Atlanta, GA | Active 2007–2011 |
| OLDMIXON GROUP LLC | Austin, TX | Active 2015–2019 |
| OLIN CORPORATION | Clayton, MO | Active 2013–2026 |
| OLIVA INTERNATIONAL, LLC | McKinney, TX | Active 2025–2026 |
| OLIVE AI | Columbus, OH | Active 2021–2023 |
| OLIVERSTRATEGIES | Washington, DC | Active 2018–2026 |
| OLSON ADVOCACY GROUP LLC | Arlington, VA | Active 2011–2026 |
| OLSON ZOO AND AQUARIUM CONSULTING, LLC | ROCKVILLE, MD | Active 2025–2026 |
| OLSSON, FRANK, WEEDA, TERMAN & MATZ, PC | Washington, DC | Active 2007–2026 |
| OLYMPUS CAPITOL STRATEGIES, LLC (FKA OLYMPUS POLITICAL CONSULTING, LLC) | Lake Saint Louis, MO | Active 2020–2025 |
| OMAHA PUBLIC POWER DISTRICT | Omaha, NE | Active 2008–2026 |
| OMB PROFESSIONALS, INC. | Sterling, VA | Active 2007–2009 |
| OMEGA STRATEGIES LLC (DC) | Washington, DC | Active 2024–2025 |
| OMEGA STRATEGIES, LLC. | Gwynn Oak, MD | Active 2023–2026 |
| OMER F. BROWN, II LAW OFFICE | Washington, DC | Active 2008–2026 |
| OMNICARE, INC. | Washington, DC | Active 2007–2015 |
Names and addresses as the register lists them. Years active spans the first and latest year of any filing by the registrant, including registrations and amendments.