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 funds is 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. Every quarter in the picker is served from its recorded snapshot rather than being fetched from EDGAR again. YoY compares the reported total value with the same quarter one year earlier. It is not a fund return: subscriptions, withdrawals, purchases and sales also change it.