Biggest Lobbying Spenders

The current ranking leader is US Chamber of Commerce (Trade Association), at $387.8M, narrowly ahead of the #2 filer National Association of Realtors ($348.2M). The gap between the top two seats has historically narrowed and widened with the legislative calendar — major appropriations cycles and tax bills tend to reshuffle the leaderboard within the top tier.

Across all 500 ranked organizations, the top 10 filers account for roughly 27% of disclosed federal lobbying spend, and the top 50 account for around 54%. That heavy concentration is the central structural feature of LDA disclosures: a small number of megaspenders set the scale, while the long tail of mid-tier and small filers drives most of the index's breadth on issue codes and named lobbyists.

The leaderboard is a single-axis view of disclosed federal lobbying — total dollars committed across the years tracked. It is the cleanest first cut at "who spends the most," but it is not the same question as "who has the most influence." A filer near the top of this table has by definition put real, sustained money behind its federal program; whether that money translated into policy outcomes is a separate question, and one the LDA disclosures themselves do not answer. For independent context on individual filers, the campaign-finance research project at OpenSecrets uses the same Senate LDA filings as one input.

By LobbySpend Influence Score, the ranked field breaks down into 0 A-grade filers (0%), 69 B-grade, 393 C-grade (79%), 38 D-grade, and 0 F-grade. The grade reflects a composite of total spend, issue breadth, and revolving-door staffing — not a judgment about effectiveness, ethics, or policy outcomes. C is intentionally the most common grade because it captures the broad middle of established but moderate filers.

The ranking spans 20 distinct industries in the LobbySpend taxonomy, with Trade Association the most heavily represented (114 organizations) — a structural feature of the data, not a reflection of any single industry's political stance.

The Influence Score weights total spend at 40%, issue breadth at 30%, and revolving-door staffing at 30%. That means a filer can sit high on this leaderboard (which uses dollars only) but carry a more moderate letter grade, and vice versa — a smaller filer with very broad issue coverage and a heavy revolving-door bench can earn an A-grade despite a mid-table dollar total. Read the methodology page for the full scoring formula and the rationale behind the weights.

Filings are pulled quarterly from the public Senate Office of Public Records LDA API. Amendments — registrants frequently file updated versions of prior quarters — are deduplicated against the original so the same dollars are not counted twice. Organization names are normalized across filings to handle subsidiaries, name changes, and the inevitable spelling variants in self-reported data. For each filing we use max(income, expenses) as the canonical amount, the standard convention used by the Senate's own dashboards.

The ranking is a strict order on disclosed total spend across the years in the index. It does not weight recency — a filer that was very active in early years and has since slowed down can still hold a high rank if its cumulative total is high. For a recency-weighted view, use the trends section, which surfaces the largest quarter-over-quarter and year-over-year movers from each refresh.