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The original data is probably from SEC disclosures, as required by the Dodd-Frank Act.

"according to a Wall Street Journal analysis of data from MyLogIQ and Institutional Shareholder Services"

Especially since most widely reported pay data is base salary only and not stock.

Exactly. Also, Broadcom on this list seems to have one of the higher median pays of $354k. Paysa seems to disagree https://www.paysa.com/salaries/broadcom