WASHINGTON — Louisiana’s biggest corporate players, many with long agendas before the state government, are restricted in making campaign contributions to Gov. Bobby Jindal. But they can give whatever they like to the foundation set up by his wife months after he took office.

AT&T, which needed Mr. Jindal, a Republican, to sign off on legislation allowing the company to sell cable television services without having to negotiate with individual parishes, has pledged at least $250,000 to the Supriya Jindal Foundation for Louisiana’s Children.

Marathon Oil, which last year won approval from the Jindal administration to increase the amount of oil it can refine at its Louisiana plant, also committed to a $250,000 donation. And the military contractor Northrop Grumman, which got state officials to help set up an airplane maintenance facility at a former Air Force base, promised $10,000 to the charity.

The foundation has collected nearly $1 million in previously unreported pledges from major oil companies, insurers and other corporations in Louisiana with high-stakes regulatory issues, according to a review by The New York Times.