Antonio Silva and Murilo "Ninja" Rua (Pictures) have signed long-term contract extensions with EliteXC, the promotion announced Thursday.

The Brazilians join Jake Shields (Pictures), Nick Diaz (Pictures) and Kimbo Slice as fighters who have recently re-signed or signed with EliteXC.

"When fighters want a home with a company that really cares about them, they will join EliteXC," said EliteXC Live Events President Gary Shaw in a news release. "Or, in the cases of almost all the fighters, they stay."

Silva, 9-1, moved from super heavyweight to heavyweight on Nov. 10 in Corpus Christi, Texas. He defeated Jonathan Wiezorek (Pictures) 3:12 into the first round via rear-naked choke.

"My goal is to be heavyweight champion," Silva said. "I want to stay active and fight all the great fighters. I would be comfortable fighting any of them right now. Maybe organizations will start to fight each other so we can have just one champion."

Rua fought on Dec. 1 at Cage Rage 24. He used a rear-naked choke to submit Xavier Foupa-Pokam (Pictures).

"A lot of other organizations give up on their fighters, but not EliteXC, and I appreciate that very much," Rua said. "They have become one of the top organizations in MMA, and I am proud to be part of it."