ServiceNow stock up 4% on news it is joining the S&P 500

ServiceNow Inc.

NOW, +2.44%

will replace Celgene Corp.

CELG, -0.64%

in the S&P 500 index

SPX, +0.05%

before the open on Thursday, S&P Global said late Monday. Bristol-Myers Squibb Co.

BMY, -1.60%

is acquiring Celgene in a deal expected to close soon. Lab equipment maker Thermo Fisher Scientific Inc.

TMO, -1.90%

will join the S&P 100, S&P Global said in the statement. ServiceNow, a cloud computing company based in Santa Clara, Calif., said earlier Monday that Gina Mastantuono will be its new chief financial officer effective Jan. 13. Shares were 4% higher in the extended session, after ending the regular trading day up 2.4%.

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