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Get closer to
what the filing says.

Make sense of insider transactions and investment-manager disclosures. Choose a tool below to explore the evidence, with no account needed.

01 / Explore the timing

Form 13F · Quarterly investment-manager holdings

13F Timing Lab

A famous investor filed. What happened next? Replay six historical disclosures and compare different entry dates with SPY, an ETF that tracks the S&P 500.

Berkshire / Alphabet, UnitedHealth and TSMC
Pershing Square / Uber · Scion / Alibaba · Soros / Rivian
Daily prices, SEC sources, and a downloadable CSV

Historical price comparisons, not a strategy backtest. Read the complete Berkshire and Scion quarterly reports ↗

Open the Timing Lab

02 / Decode the transaction

Form 4 · Reported insider transactions

Form 4 Decoder

A purchase, a grant, an exercise, or a gift? Look up the letter on a Form 4 row and separate what it reports from what it does not prove.

Codes P, S, A, M, F, G, and J
Official definitions and common misreads
Worked examples and checks for related rows

A curated code lookup. It does not fetch or decode a filing URL.

Open the Form 4 Decoder