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The Reading Room

Plain-English guides to 13F filings and institutional ownership — what the forms show, what they hide, and how to read them without fooling yourself.

01 What a 13F filing actually is 5 min
02 What a 13F does not show 5 min
03 The 45-day delay, and how to think about stale data 4 min
04 How to read a manager page 6 min
05 Portfolio weight beats dollar size 4 min
06 New, increased, reduced, exited: how changes are classified 5 min
07 Value change is not trading 4 min
08 Puts and calls in 13Fs — and why we never net them 5 min
09 Schedules 13D and 13G, explained 5 min
10 Insider filings: Forms 3, 4 and 5, and the codes that matter 5 min
11 Concentration: top-10 weight, HHI and effective holdings 4 min
12 Amendments: when the filing you read gets replaced 4 min
13 Why cloning a 13F portfolio is harder than it looks 5 min
14 The tracked universe and comparable sets 4 min
About these guides: hand-written editorial content, verifiable against SEC rules and forms; corrections via the contact page. Educational only — never advice.