[sseveran]

S&P is now excluding such share structures from companies it considers for the S&P 500, so I would anticipate that this will get much rarer among public companies.

[stanleydrew]

Interesting. Not saying I don't believe you, but I'm interested in what a company might perceive to be the value of being part of the S&P 500. Is it just a reputation boost? Or is there something concrete?

[hendzen]

There is a massive value. It means that all SP500 tracking ETFs ($SPY, $VOO etc) have to buy your shares. It's a huge boost to your share price, especially with the rise of passive investing.

[sseveran]

As more money has gone into passive strategies this is becoming more important.

[walshemj]

As does the FTSE - and I am not sure if London even allows new listings with this dual class set up any more.