37% of npr's revenues is direct corporate sponsorship. another 1/3 comes from member sations. of that third, ~20% is direct ad buys and ~40% is individual contributions, except "individuals" really means wealthy (corporately interested) donors[0]. so add it all up, and you're comfortably over 50%, without considering any of the other little influenced bits of revenue you could throw in.

so yes, that's most.

[0]: "As of September 30, 2021, 13 donors comprise approximately 77% of the gross pledges receivable balance.", from page 31 of their FY2020 consolidated financials