All you speculating on why Robin Denholm sold and making outlandish S&P 500 speculation... she adopted this sale plan on May 15th, says it right in the filing:
"The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted on May 15, 2020 and established by the reporting person for the purpose of an orderly liquidation of options scheduled to expire in 2021."
Can we chill with the speculation. There's a million different possibilities and if you're just going to take a 'wild ass guess' go to the casino. If you have some data points to share with us, I'm sure we're all ears.