Terms of the multiyear deal were not disclosed.
Fanatics did a one-off signing with Curry and observed his appeal firsthand.
"There was no question that after the MVP and the title, the velocity of orders picked up," said Victor Shaffer, executive vice president of Fanatics Authentic. "But we also saw that his fan base was expanding way beyond his traditional markets."
Fanatics is currently selling an 8-by-10 photo signed by Curry for $200 and a signed ball for $400.
Shaffer said the new deal will include signed shoes and jerseys as well as game-worn memorabilia.
Curry could be a challenge for Fanatics, as one of the most gracious signers in the sport. Shaffer said Curry's contract with the company doesn't preclude him from signing for fans for free.
"We don't want to draw a firm line in the sand and say he can't go down the line at a game and sign some signatures," Shaffer said. "We want him to keep fans happy."
That could become a challenge because Curry has such a short signature to begin with. On most autographs, one can only make out a big "C."
In the offseason, following the Warriors' Finals victory, Curry has been the darling of the sports business world. He was recently signed through 2024 to represent Under Armour, and the jersey he wore in Game 1 of the NBA Finals sold in an auction for $22,000.