Entry and exit are ranges, not exact dates. A book is a snapshot at the issuer's own period end, so an entry or exit is a BRACKET between two consecutive books — never an effective date.
Value held is a lower bound. Sum of the position's disclosed market value in the LATEST book of each holding fund. A LOWER BOUND on passive ownership — 25 tracked books, not the whole passive complex — and the books carry different period ends, so it is a sum of snapshots, not a single-date figure. Funds whose filing left the value blank are excluded from the sum and counted separately.
The pre-2019 data is scattered observations, not confirmed membership. Pre-2019 books are a reconstruction from Form N-Q / N-CSR HTML Schedules of Investments, which print a company NAME and no identifier; identity comes from a corroborated normalized-name join gated by a 2% price reconciliation, and unresolved or era-symbol rows are withheld. Absence from a pre-2019 book is therefore NOT evidence of non-membership, so no entry, exit or membership run is inferred on this leg — only the weight observations whose identity was established.
7 pre-2019 rows for this symbol are held back. ingest.nq_history: "A consumer resolving served tickers against TODAY'S reference data must therefore treat non-13f/nport2019 provenance as era-symbols, never blind-join them to current identities." Pre-2019 rows recovered under an era-symbol stage are counted below but not served — a publisher's era symbol can since have been reassigned to a different issuer. Served pre-2019 provenance stages: 13f, nport2019.
Coverage is shown per book (hover a weight): a book whose filing left part of its portfolio unmapped can understate a small position. Fund and index labels are editorial reference text for readability; every weight, value, rank and date comes from the filings alone.