Sector and industry weights of a filing's holdings

Computed on read from the filing's published positions; nothing is stored. Each position's ticker is the one GET /api/v1/nport/{accession}/holdings serves: the reported ticker, else the existing valid security mapping for that exact CUSIP. The ticker's sector and industry come from the platform's security reference list through its existing per-ticker lookup, the one the Portfolio sector allocation uses. A ticker whose reference rows disagree is not classified, so nothing is guessed.

weight_pct sums the positions' pct_val exactly as filed, in percentage points of net assets, and value_usd sums val_usd. The sector weights plus the unclassified weight equal the filing's own pct_val total, which can differ from 100 when a fund reports cash, derivatives or liabilities. Industries cover positions that have both a sector and an industry.

unclassified holds positions with no ticker (for example a position filed without a CUSIP, or a cash fund), a ticker absent from the reference list, a ticker with conflicting reference rows, or no sector. The reference list classifies operating companies, so a bond fund is mostly unclassified; its holdings carry asset_cat on GET /api/v1/nport/{accession}/holdings. The sample is iShares Core S&P 500 ETF's filing 0002071691-26-019760 for 2026-06-30 (three of its 11 sectors and 111 industries shown).