These guys came over before Strikeforce officially closed and thus are not included on the list.
Jason Miller: Miller came to the UFC and got an opportunity to coach The Ultimate Fighter opposite Michael Bisping. Miller ended up losing to Bisping by Round 3 TKO and lost to CB Dollaway by decision after that. He left the UFC with a record of 0-2 and an overall UFC record of 0-3.
Nick Diaz: Diaz left Strikeforce—and his welterweight title—to come to the UFC and fight Georges St-Pierre for the UFC welterweight title. Through a series of replacements, Diaz ended up fighting and beating BJ Penn at UFC 137. He lost his next fight to Carlos Condit for the interim UFC Welterweight Championship and then lost to St-Pierre for the undisputed UFC championship. He is now semi-retired.
Dan Henderson: Henderson's Strikeforce contract expired following his knockout of Fedor Emelianenko. He defeated Mauricio Rua by unanimous decision in his first fight back in the UFC in what would become the Fight of the Year for 2011. Following that, he lost three straight to Lyoto Machida, Rashad Evans and Vitor Belfort before rebounding with another victory over Rua.
Alistair Overeem: Overeem was cut from Strikeforce following his inability to be ready to fight in time for the next round of the Strikeforce Heavyweight Grand Prix. He signed with the UFC and TKO'd Brock Lesnar in his first fight. He would lose his next two, to Antonio Silva and Travis Browne, by knockout. In his most recent fight, he won a unanimous decision over Frank Mir.
Antonio Silva: Silva beat Fedor in the first round of the Strikeforce Grand Prix and then got knocked out by Daniel Cormier in the second round. He made his UFC debut against Cain Velasquez and was beaten in just minutes. He then won two straight with knockouts over Travis Browne and Alistair Overeem before again running into Velasquez, who knocked him out for a second time. He then fought Mark Hunt to a draw, which was later overturned to a no-contest when Silva failed the post-fight drug test.