Hartman Harman Cosco LLC Hartman Harman Cosco LLC is a registered federal lobbying firm. For Q1 2022 it reported $0 across 1 client report and lists 3 lobbyists across its filings.
Clients, Q1 2022 By year Lobbyists listed Amounts are the filer's good-faith estimates, per report, and cannot be split by issue. See the Capitol Clarity rankings and method .
Source: Lobbying Disclosure Act filings, retrieved from LDA.gov on 2026-11-08. Senate Office of Public Records cannot vouch for the data or analyses derived from these data after the data have been retrieved from LDA.gov. PAC totals are from the Federal Election Commission; under 52 U.S.C. 30111(a)(4), information copied from FEC reports may not be sold or used to solicit contributions or for commercial purposes. Capitol Clarity is not affiliated with any government office. 