Curry, 25, has developed into one of the NBA's best players, its most devastating outside shooter and one of its most coveted endorsers.
The partnership is expected to be formally announced next week, sources said.
Under Armour has had deals with several solid NBA players, including Brandon Jennings and DeAndre Jordan, but Curry – one of the league's most popular players with young fans – clearly elevates the company's brand.
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In his third NBA season, Curry averaged nearly 23 points and seven assists, and led the Warriors to the Western Conference semifinals. He set an NBA single-season record with 272 3-pointers a season ago.
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- Golden State Warriors