Daniel Harder is named as a lobbyist on federal disclosure filings for 20 clients through Mayer Brown LLP and 1 other registrant. The most recent filing naming them posted in October 2026. Issues reported include Trade (domestic/foreign), Taxation/Internal Revenue Code, Health Issues and Chemicals/Chemical Industry.
Filers must list covered executive or legislative branch positions held. As filed:
| Client | Registrant | Latest | Issues |
|---|---|---|---|
| ONSEMI (ON SEMICONDUCTOR CORPORATION) | MAYER BROWN LLP | Q3 2026 | Energy/Nuclear |
| WAUPACA FOUNDRY, INC. | MAYER BROWN LLP | Q3 2026 | Trade (domestic/foreign) |
| PENN ALUMINUM INTERNATIONAL LLC | MAYER BROWN LLP | Q3 2026 | Trade (domestic/foreign), Taxation/Internal Revenue Code |
| SOLONIAN RESOURCES, LLC | MAYER BROWN LLP | Q3 2026 | Trade (domestic/foreign) |
| MICHELIN NORTH AMERICA, INC. | MAYER BROWN LLP | Q3 2026 | Trade (domestic/foreign) |
| GALAXY DIGITAL HOLDINGS, LP | MAYER BROWN LLP | Q3 2026 | Taxation/Internal Revenue Code |
| STARR INSURANCE HOLDINGS, INC. | MAYER BROWN LLP | Q3 2026 | Insurance |
| PRIMEMAX MEDICAL INDUSTRIES, INC. | MAYER BROWN LLP | Q3 2026 | Trade (domestic/foreign) |
| NOVOCURE | MAYER BROWN LLP | Q3 2026 | Trade (domestic/foreign), Medical/Disease Research/Clinical Labs, Tariff (miscellaneous tariff bills) |
| IFM INVESTORS PTY LTD. | MAYER BROWN LLP | Q3 2026 | Transportation |
| ELEMENT ELECTRONICS | MAYER BROWN LLP | Q3 2026 | Trade (domestic/foreign), Tariff (miscellaneous tariff bills) |
| OURARING INC. | MAYER BROWN LLP | Q3 2026 | Trade (domestic/foreign), Taxation/Internal Revenue Code, Health Issues |
| COALITION FOR REGULATED HFCS INC. | MAYER BROWN LLP | Q3 2026 | Chemicals/Chemical Industry |
| SUNIVA, INC. | MAYER BROWN LLP | Q2 2026 | Taxation/Internal Revenue Code, Trade (domestic/foreign) |
| ITO EN (NORTH AMERICA) INC. | MAYER BROWN LLP | Q2 2026 | Trade (domestic/foreign) |
| U.S. VENTURE, INC. (FORMERLY U.S. OIL) | MAYER BROWN LLP | Q1 2026 | Taxation/Internal Revenue Code |
| SYENSQO USA LLC | MAYER BROWN LLP | Q1 2026 | Trade (domestic/foreign) |
| UNITED STATES STEEL CORPORATION | MAYER BROWN LLP | Q3 2025 | Trade (domestic/foreign), Manufacturing |
| BIOGEN | BIOGEN | Q2 2025 | Trade (domestic/foreign), Taxation/Internal Revenue Code, Health Issues |
| RABO AGRIFINANCE LLC | MAYER BROWN LLP | Q2 2025 | Taxation/Internal Revenue Code |
| Year | Clients | Registrants |
|---|---|---|
| 2026 | 17 | 1 |
| 2025 | 15 | 2 |
| Year | Items | Total |
|---|---|---|
| 2026 | 9 | $6K |
Pay is not disclosed for individual lobbyists. Filings do not confirm that records with the same name are one person, so this page may combine people who share the name Daniel Harder. See the Capitol Clarity rankings and method.