Martin Singer, Willis' lawyer, says the federal lawsuit filed in Los Angeles has been "amicably resolved."
The Kuala Lumpur-based Petra Group said Willis invested $2 million last year in its subsidiary, Green Rubber, a developer of technology that can recycle rubber in old tires.
Petra returned $1.1 million to the star of the "Die Hard" action films earlier this year when he decided to pull out his investment. Willis sued last week to get the remaining $900,000, plus interest and other compensation.
Singer says the initial investment has been repaid, but Willis was not given all the interest owed him. The actor remains a shareholder in the company.
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