(Bloomberg) -- Private equity giant Blackstone Inc. is the latest addition to the S&P 500 Index, the first alternative asset manager to join the equity gauge. Airbnb Inc. is added as well.Most Read from BloombergTesla’s $41,000 Model X Discount Unlocks Subsidies Musk Wanted GoneSaola Departs Hong Kong After Bringing Destructive WindsTesla Refreshes Model 3 and Slashes Prices of Top-End CarsSingapore Votes for President in Test of Ruling Party’s SwayPutin Moves to Seize Control of Wagner’s Mercen