All lobbying filings

PIONEER PUBLIC AFFAIRS

PIONEER PUBLIC AFFAIRS filed a registration for MP MATERIALS CORP. on April 7, 2026.

Lobbying for MP MATERIALS CORP. · Rare earth materials producer

All filings by PIONEER PUBLIC AFFAIRS · Everything MP MATERIALS CORP. has reported

Filing · LD-1 registration Registration

Reporting period

2nd Quarter 2026

Apr 1 - June 30 · Posted Apr 7, 2026

Money reported

None

Registrations and no-activity reports carry no figure.

Client based in

Nevada

Official filing document

Lobbyists on this filing 3

JOSEPH BRITTON New on this filing

Previously held: Chief of Staff to Sen. Martin Heinrich; Deputy Chief of Staff & Legislative Director to Sen. Mark Udall; Legislative Assistant to Sen. Ben Nelson
ALEXANDER MCDONOUGH New on this filing

Previously held: Senior Policy Advisor, Senator Harry Reid
CARIANNE LEE New on this filing

Previously held: Senior Legislative Assistant, Rep. Bonnie Watson Coleman

A "covered position" is a government job the lobbyist held in the 20 years before registering, which the law requires them to name. See the revolving door for former members of Congress across all filings.

Lobbying activity 2

Energy/Nuclear

Advocate on issues relating to rare earth materials and critical minerals.

Defense

Advocate on issues relating to rare earth materials and critical minerals.

Source: federal Lobbying Disclosure Act filing, reproduced as filed. Bills are parsed from the activity descriptions.