Bloom Energy jumps ahead of S&P 500 addition

At Fri close, stock surged 191%

Meanwhile, data storage platform Everpure P.N, formerly Pure Storage, and DNA sequencing firm Illumina ILMN.O also joining the SPX, as they migrate from S&P MidCap 400 index .IDX coinciding with the rebalance

This as building materials supplier Builders FirstSource BLDR.N, ad tech platform Trade Desk TTD.O and Molson Coors Beverage Co TAP.N set to move from SPX to S&P SmallCap 600 .SPSY

Fuel-cell maker Bloom Energy's BE.N shares jump 6.3% before the bell on Tues to $268.80, a two-month high, as co poised to join S&P 500 .SPX later this month

BE shares on track to advance for fifth straight day

Co to join SPX effective Sept. 21 as part of quarterly rebalance, S&P Dow Jones Indices announced late Fri

Stephens analyst Melissa Roberts said in a note she expects passive funds will need to purchase roughly 56 mln BE shares, implying about 5 trading days of buying demand

San Jose, California-based BE has ~294.5 mln shares outstanding for about $74 bln market cap as of Fri