The Boardroom — CEO Stock Trades, Made Readable

Source: SEC Form 4 filings.
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How rankings work

Largest CEO Buys and Largest CEO Sells are ranked separately using transaction values calculated from the shares and reported prices in each Form 4. Matching lines in one filing are grouped, and their values are added together. Transactions without a usable reported price show N/A and are not treated as having a zero-dollar value.

What is a Form 4?

Company insiders — officers, directors, and large shareholders — must report most stock trades to the SEC within two business days on Form 4. It's the fastest public window into what people running a company are doing with their own shares.

Common transaction codes

P — Open market buy: Insider purchased shares on the open market with their own money.
S — Open market sell: Insider sold shares on the open market.
A — Award / grant: Shares or derivative securities granted as compensation, not an open-market purchase.
F — Tax withholding: Shares withheld or disposed to satisfy a tax or exercise-price obligation. This is not treated as an open-market sale.
M — Option exercise: Previously granted options were exercised. Options and common shares remain separate in the displayed totals.
10b5-1 plan: A trading arrangement adopted in advance. A transaction reported under one should not, by itself, be interpreted as the executive's current outlook on the company.