Transparency — how you check the numbers yourself

Level 1 — Integrity: does the data tie out? (21)

• DL14 — In the connector, events of a company that left the exchange answer without an error, dividends return the error with the left-the-exchange block and no empty list, and an unknown code returns the usual error plus suggestions and the 404 status.
• DL01 — Delisted-company price file reader: only share lines (BDI 02), spot market, class suffix 3-8 or 11 are read, with the same slices as the main price ingest and the quotation factor dividing the QUANTITY, never the price; forward, odd-lot, subscription rights and zero closes are rejected.
• DL02 — The ISIN issuer code is taken only from share (ACN) or unit (CDA) ISINs; ETF, fund and foreign ISINs have none and never enter linking or the gap list.
• DL06 — Building the delisted tables is idempotent: it deletes and rebuilds, so no duplicated sessions and no ticker survives a link that no longer exists.
• DL07 — The list of tables purged when a company leaves the universe excludes the delisted-company tables, otherwise each build would recreate the survivorship bias they exist to fix.
• DL09 — A trading code the company itself declared to the CVM counts even outside the usual format (GOL traded as GOLL54 until 2026) when the B3 quote line is a share; declared rights and undeclared odd codes stay out.
• DL10 — Asking for the dividends of a stock that left the exchange (AESB3, ENBR3) never returns 200 with an empty list: with dividends declared to the CVM it returns them with the left-the-exchange block, otherwise 404 with that block and a retry hint saying the absence is unknown.
• DL11 — A code the database does not have stays 404 with the usual message plus structured suggestions (same root or close spelling, only known codes) so an assistant can retry by itself; retrying with the first suggestion works.
• DL12 — Prices and indicators of a company that left the exchange stay 404, but the error says it left, gives the last trading day and the routes that do answer, and the panel still counts the request.
• DL13 — Corporate events of a company that left the exchange answer 200 with the left-the-exchange block even without a key and a null (not empty) B3 event list; the events declared to the CVM reference form follow the key rule and always carry the no ex-date flag.
• DL15 — A code of a listed company never turns into a company that left the exchange, and a reused code goes to the listed one.
• DL20 — Dividends a delisted company declared in the CVM Reference Form (item 3.5) enter with fiscal year, share class, type, amount and payment date; a re-declared year counts once (newest form), zero amounts and listed companies stay out.
• DL21 — The dividends answer for a company that left returns what it declared to the CVM with the left-the-exchange block and a coverage naming source and period; a company with nothing declared stays 404, never an empty list.
• DL22 — The IPE dividend report of a company that left enters per share with record date, only for ISINs of its own issuer; free-form files are kept without value, nothing is downloaded twice, and an unreachable CVM stops after 5 failures.
• DL30 — The page of a stock that left the exchange (/saiu-da-bolsa/ENBR3, BIDI4, AESB3) opens in Portuguese and English with the direct answer (name, last trading session, total declared to the CVM as a total amount, not per share), the per-year table equal to the JSON /empresas/{T}/dividendos, the CVM code, a citation line with the data version and the page URL, and follows the asset-page rule (English noindex, no hreflang).
• DL31 — On /saiu-da-bolsa every ticker of a company that left links to its own page (or to /acoes/{T} if still in the universe), every such link answers 200, the sitemap has exactly one URL per delisted ticker, and llms.txt cites the per-ticker page with the count.
• DL32 — The English page of a stock that left the exchange has the same numbers, anchors, internal links and table rows as the Portuguese one.
• DL33 — On the synthetic database, the page of a delisted stock with dividends shows the JSON totals and links its other ticker; one with no declared dividend answers 200 saying the absence is unknown, without a table and without linking the 404 dividends route; an active company is 404.
• DL41 — The internal search finds the yearly pages and the main list by deslistagem, OPA, fechamento de capital, cancelamento de registro and saiu da bolsa (the year typed comes first), plus the companies of that year with working links; petz finds the PETZ3 page and AUAU3; the exact code PETZ3 goes straight to its page; /buscar?q= goes to the search; active tickers still go to their own page.
• DL43 — The home block states how many companies left the exchange in the latest year with a page, through the last session date, linking the yearly page and the main list; with no data it says nothing; every page footer links /saiu-da-bolsa.
• DL44 — Performance of a delisted stock (NTCO3) runs up to its last trading day on the as-traded price, without total return, and says distributions are not included

Level 2 — Semantics: does the account mean what the calculation assumes? (7)

• DL03 — An issuer claimed by two companies through their declared codes is given to neither (no last-wins, no dictionary-order owner); an unambiguous issuer gives its company every share ticker it ever traded under.
• DL04 — End to end on synthetic files: a delisted company gets the code it declared plus the old tickers of the same ISIN issuer, prices stop at each ticker's last session, active companies and their other classes never enter, an unclaimed issuer becomes a gap, an inconsistent OHLC row is kept but flagged, and the old snapshot is rebuilt.
• DL05 — CVM Reference Form splits and reverse splits enter for delisted companies only, once per event (resubmissions do not duplicate), with the declared ratio and the sem_data_ex flag: the form has the approval date, not the ex-date, so it cannot adjust prices.
• DL08 — Delisted coverage is counted from the tables (companies, linked tickers, sessions, declared events, zero dividends because no source exists, gap volume); a database without them reads not built, never zero; the gap table carries class lacuna.
• DL23 — The FRE amount of a company that left is published in reais: when the company typed it in thousands (checked against the DFP net income, which states its scale, or against its own total), it is multiplied by 1,000 and flagged; with nothing to check against it stays as declared.
• DL40 — Each yearly page of companies that left the exchange (/saiu-da-bolsa/{year}) opens in Portuguese and English with the synonyms in title, heading and description (delisting, tender offer, going private, registration cancellation); the count in the direct answer equals the rows and names of the list, the cancellation count equals the second table, 2026 matches the year table of /saiu-da-bolsa, the visible FAQ equals the FAQPage JSON-LD, and the page has the method, primary sources, dividend coverage, its own canonical and the hreflang trio; the sitemap and the main list link every year; a year without a page is 404.
• DL42 — /acoes/{ticker} of a company that left the exchange redirects (301) to its own page, which answers 200; curated ticker changes go to the new ticker; a different successor company stays 404; active and same-company changes are unchanged. The PETZ3 page shows the last per-share dividend (R$ 0.2883, record date 2024-11-13, paid 2024-11-29) equal to the database row, with the CVM filing link, and links AUAU3 as the ticker trading afterwards, with dates checked in the database (consecutive sessions).

Level 3 — Economic: is the result possible in the real world? (0)

Other product tests (0)

Access gate, navigation and the MCP connector — they test whether the product works, not whether a number is right, so they don't fit the 3 levels above by design. Still counted, still listed: