Alphabet's most recent 10-K contained the following note in respect of their shares:

submit a brief note (e.g. one page) telling me your thoughts on the following:

1) why you believe Alphabet/Google established three separate classes of common shares, and

2) why you believe Alphabet/Google is repurchasing and retiring its Class C shares.

Convertible Preferred Stock Class A and Class B Common Stock and Class C Capital Stock Share Repurchases through Rule 10b5-1 plans. The repurchase program does not have an expiration date. Alphabet Class C capital stock for an aggregate amount of $18.4 billion, respectively