US Equities Announcements

How to use it

Rows are effective-dated. Answer point-in-time questions with the row in force on the as-of date, never the latest row. SecId and ASID are both durable AlgoSeek security keys but different values (the ASID lookup links them); tickers are reused across companies, so resolve a ticker to a key with a trade date.

Typical use

Point-in-time security identity, corporate-action adjustment, and universe construction for US equities.

Limitations

Vendor-curated reference data: rows can be restated when AlgoSeek learns of a late or corrected event, so land each delivery as a snapshot rather than overwriting history. Point-in-time: AnnounceDate is when the event became public and EffectiveDate is when it takes effect; the dataset covers announcements of FUTURE changes, so EffectiveDate is usually after AnnounceDate (sample: always later). Use AnnounceDate for as-of knowledge, EffectiveDate for the symbol/listing switch. EffectiveDate holds the effective date published at first announcement; later rescheduling is not stated to be reflected, so treat it as the initially announced date, not a confirmed one. Identity: SecId is the algoseek security identifier; Ticker is the symbol at announcement. For TickerChange, Ticker = OldTicker in every sample row and NewTicker is the post-change symbol; for Delisting, OldTicker/NewTicker are blank and DelistingExchange is set. Field applicability by EventType: TickerChange rows use OldTicker/NewTicker (DelistingExchange blank); Delisting rows use DelistingExchange (OldTicker/NewTicker blank). In the sample 94 of 100 rows are Delisting and 6 are TickerChange.

Coverage

All announcements of future symbol changes and delistings on public US exchanges; OTC excluded. Built from public sources (page: exchange listing announcements and company SEC filings). Available from 2022.

Usage constraints

• Licensed vendor data: never export raw rows to a tenant-local destination or include them verbatim in a public artifact; serve only through entitlement-checked platform reads.
• Do not treat the vendor's `Ticker` as a stable identity across time; join on an AlgoSeek security key (SecId or ASID, which are distinct) or the platform symbol mapping.

Known issues (5)

• Primary key is inferred; AlgoSeek's guide does not name one.
• Documentation discrepancyGuide Table 3 shows the event name as 'Ticker Change' (wrapped across two lines); the published sample uses TickerChange.
• Documentation discrepancyGuide says EffectiveDate may be blank when the effective date is not yet defined; no sample row has a blank EffectiveDate.
• Documentation discrepancyGuide does not enumerate DelistingExchange; sample has NASDAQ, NYSE, AMEX (71/21/2 of 94 delistings) and the guide's own example uses the same three.
• Documentation discrepancyGuide intro says the data covers 'announces for symbol's name changes and Delistings'; 'name' means the ticker symbol, there is no company-name field.