June 7 (Reuters) - The S&amp;P Dow Jones Indices said on Friday that private equity firm KKR &amp; Co (KKR.N) , cybersecurity company CrowdStrike (CRWD.O) and internet services provider GoDaddy (GDDY.N) will join the benchmark S&amp;P 500 (.SPX) before markets open on June 24.
Shares of CrowdStrike rose 6% in extended trading. KKR and GoDaddy climbed 9% and 3.6%, respectively.
The companies will replace recruitment services firm Robert Half (RHI.N) , U.S. regional lender Comerica (CMA.N) and gene sequencing machine maker Illumina (ILMN.O) in the index.
Shares of Robert Half fell 2.2%. Comerica was last down 0.4%, while Illumina was 0.6% lower.

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CrowdStrike, KKR, and GoDaddy will join the S&P 500 on June 24, replacing Robert Half, Comerica, and Illumina. CrowdStrike's shares rose 6%, while KKR and GoDaddy climbed 9% and 3.6% respectively.

CrowdStrike, KKR, GoDaddy to join benchmark S&P 500