When’s it going to occur?Hypothesis continues to be rampant in 2020 over what may occur if and when Tesla Inc. (TSLA) -Get Report will get added to the S&P 500 (^GSPC) -, now that it is met the profitability threshold required to affix the large index.Index shakeups are on everybody’s thoughts this week, following an enormous shuffle within the Dow Jones Industrial Common.A Tesla add for the S&P is a much bigger deal than it may appear. Tesla made headlines a couple of days in the past when it handed Walmart (WMT) -Get Report in market value, changing into the ninth most respected stock in the usOne consequence of that’s the truth that Tesla is massive. Because the S&P 500 is a free-float capitalization weighted index, Tesla’s present price tag would make it the 11th-largest S&P part proper now, with slightly below a 1.1% weight within the index.The final time a brand new constituent that giant was added to the S&P was Berkshire Hathaway (BRK.B) -Get Report, which had an nearly equivalent weight when it was added – the one distinction is that the S&P (and the passive cash that tracks it) is worth considerably extra at this time than it was again then.So, what would the S&P 500 appear to be proper now with Tesla in it?For starters, it’d be greater than it’s at this time :Assuming Tesla joined at first of the 12 months and the S&P 500 was rebalanced repeatedly, it winds up about 4% greater with Tesla in it.A part of that’s due to how insane Tesla’s 2020 rally has been relative to its giant friends:Tesla actually stands aside.(The chart above additionally highlights the dimensions impact we’ve been speaking about currently.)In fact, the subsequent massive query is what occurs to Tesla’s stock price when a bunch of passive traders are mandated to start out dumping cash into one of many highest-weight S&P 500 parts on the identical time.When it occurred to Berkshire, shares outperformed the S&P 500 by 18% within the month and a half that adopted its inclusion within the index.We’ll take a more in-depth take a look at what that would imply for Tesla’s stock price up forward… Keep tuned.In the meantime, right here’s what the highest 15 stocks within the S&P 500 could be if the index have been rebalanced at this time:: To make issues somewhat extra attention-grabbing, the S&P 500 chart makes use of steady rebalancing, with weights primarily based on each day free-float-adjusted market capitalization and assumes a easy rebalance that knocks off the smallest index part when Tesla is added. Altering these assumptions adjustments the chart a bit, however not dramatically.