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 |
|---|---|---|
| SHUTTS & BOWEN | Tallahassee, FL | Active 2017 |
| SHW PARTNERS LLC | Arlington, VA | Active 2020–2026 |
| SI-BONE, INC. | Santa Clara, CA | Active 2017–2018 |
| SIC GROUP USA LLC | Silver spring, MD | Active 2024 |
| SICPA PRODUCT SECURITY | New York, NY | Active 2009–2012 |
| SIDECAR HEALTH, INC | El Segundo, CA | Active 2021–2026 |
| SIDEPRIZE LLC D/B/A PRIZEPICKS | Fairfax, VA | Active 2024–2026 |
| SIDLEY AUSTIN LLP | Washington, DC | Active 2007–2026 |
| SIEKMAN AND SIEKMAN LLC | New Albany, OH | Active 2017–2026 |
| SIEMENS CORPORATION | Washington, DC | Active 2007–2026 |
| SIEMENS ENERGY, INC | Orlando, FL | Active 2020–2026 |
| SIEMENS GAMESA RENEWABLE ENERGY, INC. | Orlando, FL | Active 2022–2023 |
| SIEMENS MEDICAL SOLUTIONS USA, INC | Washington, DC | Active 2021–2026 |
| SIERRA CLUB | Oakland, CA | Active 2007–2026 |
| SIERRA HEALTH SERVICES | LAS VEGAS, NV | Active 2007 |
| SIERRA NEVADA COMPANY, LLC | Sparks, NV | Active 2012–2026 |
| SIERRA PACIFIC STRATEGIES | Keizer, OR | Active 2026 |
| SIERRA SPACE CORPORATION | Broomfield, CO | Active 2022–2026 |
| SIFF & ASSOCIATES PLLC | Washington, DC | Active 2010–2021 |
| SIFF & LAKE LLP | WASHINGTON, DC | Active 2007–2010 |
| SIG SAUER INC | Newington, NH | Active 2020–2026 |
| SIGHTLINE ADVOCACY, LLC | McLean, VA | Active 2025–2026 |
| SIGNAL ADMINISTRATION INC | WILTON, CT | Active 2007 |
| SIGNAL GROUP CONSULTING, LLC | Washington, DC | Active 2007–2026 |
| SIGNAL RIDGE STRATEGIES | Washington, DC | Active 2025–2026 |
| SIGNATURE HEALTH SERVICES | Baytown, TX | Active 2009–2010 |
| SIGNIFICANT CONSULTING, LLP | Arlington, VA | Active 2019–2021 |
| SIGNIFY HEALTH | Dallas, TX | Active 2019–2023 |
| SIIA | WASHINGTON, DC | Active 2007–2026 |
| SILA NANOTECHNOLOGIES, INC. | Alameda, CA | Active 2023–2024 |
| SILENT MAJORITY STRATEGIES LLC | Bryn Mawr, PA | Active 2017–2018 |
| SILVER LEGAL SERVICES LLC | Vienna, VA | Active 2023–2025 |
| SILVERBERG, GOLDMAN & BIKOFF | WASHINGTON, DC | Active 2007 |
| SILVERLINE COMMUNICATIONS, LLC (F/K/A GAIA GROUP PUBLIC RELATIONS, LLC) | McLean, VA | Active 2011–2016 |
| SIMMONS ENERGY AND ENVIRONMENTAL STRATEGIES LLC | Falls Church, VA | Active 2025 |
| SIMON CONSULTING SERVICES | Providence, RI | Active 2017–2022 |
| SIMPLOT CO. J.R. | Boise, ID | Active 2007–2026 |
| SIMPSON PUBLIC AFFAIRS, LLC | Atlanta, GA | Active 2014–2016 |
| SIMPSON THACHER & BARTLETT LLP | Washington, DC | Active 2007–2026 |
| SIMS STRATEGIES, LLC | Washington, DC | Active 2017–2026 |
| SINCLAIR BROADCAST GROUP | Hunt Valley, MD | Active 2014–2026 |
| SINGER CONSULTING LLC | Chicago, IL | Active 2007–2019 |
| SINGISER SOLUTIONS LLC | Washington, DC | Active 2026 |
| SINHA ASSOCIATES LLC | Washington, DC | Active 2017–2023 |
| SIO ADVOCACY LLC | Reston, VA | Active 2026 |
| SIRH, PETER | Fairfax, VA | Active 2007 |
| SIRONA STRATEGIES LLC | Washington, DC | Active 2014–2026 |
| SIROTE & PERMUTT, P.C. | BIRMINGHAM, AL | Active 2007–2013 |
| SISCO CONSULTING, LLC | FRANKLIN, TN | Active 2007–2011 |
| SISCORP | FAIRFAX STATION, VA | Active 2007–2009 |
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.