Blog
Walkthroughs of how to read a company, written against the real product and real filings. Every figure links back to the document it came from.
Micron: the quarter the cost line did not move
Five readings of one company's filings, taken in the middle of a cycle rather than after it: a record margin, a trillion-dollar market cap, no buybacks, a new $3.63B holder and one unscheduled sale.
8 min read
How much do your ETFs overlap? VOO, VTI and QQQ
Seven pairs of funds people actually hold, measured against each other from the holdings each issuer publishes, with the two numbers that answer different questions.
9 min read
PayPal: 42 insider sales, one purchase, one checkbox
One company, three sets of filings, read against each other: what PayPal's Form 4s, its statements and its 13F holders each say, and why they do not agree.
7 min read
How to analyze a company in 30 minutes
A working method, run end to end on Microsoft's own filings: where each number comes from, which ones mislead, and what to make of each one.
11 min read
How to read a 13F filing: what Buffett and the funds own
What a 13F is, what it leaves out and what it can never tell you, read line by line on Berkshire Hathaway's filing for Q2 2026.
8 min read