SEC Filings - https://investor.coinbase.com/financials/sec-filings/default.... Look out for "Statement of Changes in Beneficial Ownership" to see stock grants/ sales for insiders (executives and directors).

But, scouring SEC filings can be demanding, so there are several websites that specialize in extracting and displaying such information, for example - https://www.marketbeat.com/stocks/NASDAQ/COIN/insider-trades...

I think OpenInsider has a good interface for this: http://openinsider.com/COIN

It's part of most stock listing pages under "Insider Transactions". Here's one for Alphabet: https://finance.yahoo.com/quote/GOOGL/insider-transactions/

You can read the public filings with the SEC here: https://www.sec.gov/edgar/browse/?CIK=1679788

But if you don't know what you're looking for it can be tedious.

Here are insider purchases and sales in an easier to navigate format: https://www.nasdaq.com/market-activity/stocks/coin/insider-a...

This is a simple, clean site that I like:

https://www.secform4.com/insider-trading/1679788.htm

Insiders sell stock whether executives or employees. Otherwise why work for a company and get compensated in stock if selling it was banned / frowned upon?

You can find the puically filed SEC form 4s online