13FInstitutional disclosures, retail clarity
How would following a fund perform?
Simulate copy-trading delayed 13F holdings versus the S&P 500. Rebalance only when new filings drop — the same information advantage (and lag) everyone gets.
Sample: Berkshire vs SPY
Thin sim from cached DB prices · $10,000 start
Strategy
SPY
Realistic delay
Positions are bought on the filing date, not the report period — matching how delayed the public signal really is.
Quarterly rebalance
Weights adapt as managers add, trim, and exit — not a naïve sell-all / buy-all each quarter.
Benchmark alpha
Every run charts strategy value against buy-and-hold SPY so you see relative performance at a glance.
Managers on file
Browse all filings →Appaloosa LP
CIK 1656456BAUPOST GROUP LLC/MA
CIK 1061768BERKSHIRE HATHAWAY INC
CIK 1067983Bridgewater Associates, LP
CIK 1350694CITADEL ADVISORS LLC
CIK 1423053COATUE MANAGEMENT LLC
CIK 1135730D. E. Shaw & Co., Inc.
CIK 1009207Duquesne Family Office LLC
CIK 1536411Elliott Investment Management L.P.
CIK 1791786GREENLIGHT CAPITAL INC
CIK 1079114ICAHN CARL C
CIK 921669JANA PARTNERS LLC
CIK 1159159