Source: SEC EDGAR Form 13F filings. Managers file within 45 days of quarter end, so a book is up to a quarter and a half old — and a 13F covers US-listed long positions only, not shorts, cash or anything held outside the US. The two leaderboards add up the share positions of every manager on this list: added is what each one bought since its previous filing, priced at what that filing implies those shares were worth; buyers counts the managers on the buying side of it; opened is how many started the position from nothing; and fundsis how many report holding the ticker at all. Both boards follow the quarter you pick, and both measure buying against each manager's previous filing — so on Q1 2026 they describe what changed between Q4 2025 and Q1 2026. Only the most recent quarter is stored; picking an older one reads it from EDGAR, which takes a few minutes the first time. YTD (est.) is not a reported return — no 13F contains one. It prices the manager's 25 largest reported positions from the first close of the year and weights them by what the filing says they were worth, so shorts, options, cash, leverage and every trade since the report date are outside it; it is shown for the most recent quarter only, since pricing an older book against this year would not be that book's return either.