EQUITY SECURITY MASTER
The equity security master, battle-hardened and built to be trusted in production.
algoseek does what most vendors will not: build, maintain, and quality-control an equity security master entirely in-house, from multiple independent sources.
Equity Security Master (sample)
ASID
| Field | Type | Example |
|---|---|---|
| ASID | integer | 320193 |
| ListStatus | string | L |
| Ticker | list(string) | AAPL |
| Name | list(string) | Apple Inc. |
| Sector | string | Technology |
| ISIN | list(string) | US0378331005 |
| FIGI | list(string) | BBG000B9XRY4 |
| USIdentifier | list(string) | 037833100 |
| PrimaryExchange | list(string) | NASDAQ |
Built, not borrowed
Most vendors white-label someone else’s master. We built ours.
Almost every vendor resells a third-party master under its own name and inherits every gap it cannot fix.
algoseek owns the build and pushes fixes before they reach your pipeline, which is why the master has survived production at hundreds of firms.
Maintained in-house, daily
A dedicated team sources, builds, and quality-controls the master directly. When something is wrong, we can fix it, because we own every step.
Cross-referenced against multiple inputs
We reconcile our own data against independent external sources, so errors surface before they reach you, not after they have propagated downstream.
Full equity history from 2007
Every security that has ever traded, including the delisted, merged, and acquired. The universe as it actually was, not the survivors.
The cost of getting it wrong
What you will NOT get from a resold master.
If your identifiers are wrong, everything built on top of them is wrong too. The errors do not announce themselves; they surface as a number that looked right in research and behaves differently in production.
The algoseek equity master
Built from multiple independent sources and reconciled against our own market data.
Updated daily, so corporate events land in the file before they distort your results.
A team that owns the data end to end, and a master battle-tested across hundreds of firms in production.
Full security masters for equity and options, with futures next, all keyed to one persistent ID.
A third-party master, white-labeled
Sourced from a single external provider with documented gaps, repackaged under a new name.
Updated weekly. By the time a corporate event reaches the file, your pipeline has already run on stale identifiers.
No one to call when a mapping is wrong. The vendor cannot fix data they did not build.
Equities only. No equivalent master for options or futures, so every asset class needs a separate fix.
The same ASID covers equity and options, with futures next, asset classes most vendors do not offer a full master for at all. One identifier, one source of truth, across everything you trade and research.
The ASID
A ticker is not an identity. One persistent ID is.
A ticker is a label; the algoseek Security ID never moves. It pins the security across every name change, split, share-class change, and delisting. A real example, entirely within algoseek’s history:
Alphabet (Google): one ASID, the ticker keeps moving
one persistent ASID
2007
Covered from here
GOOG
2014
Class C created, shares split
GOOGL + GOOG
2015
Renamed to Alphabet
GOOGL, GOOG
2022
20-for-1 split, all classes
GOOGL, GOOG
Anything keyed to “GOOG” quietly stitches a voting Class A share to a non-voting Class C share, then mishandles two splits along the way. Keyed to the ASID, the history resolves correctly on its own.
Why ticker-keyed data quietly corrupts
Key your data to the symbol string and you are stitching together different securities, dropping names at delisting, and double-counting after splits. None of it raises an error.
Reference the ASID and the full history resolves correctly, with no mapping tables to build and watch drift out of date.
-
A delisted ticker gets reassigned to an unrelated company, silently merging two histories into one.
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Survivorship bias: delisted names vanish from a ticker universe, so your analysis only ever sees the survivors.
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A split or share-class change breaks the price series exactly where the ticker stayed the same.
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Hours of analyst time spent maintaining hand-built ticker maps that drift out of date the moment they ship.
Universal cross-referencing
Reconcile against whatever your team already runs on.
FIGI and ISIN ship with every record, with further identifiers available on request. Reconcile cleanly against Bloomberg, Refinitiv, your prime broker, or any internal system in your pipeline.
ASID
FIGI
ISIN
+ others on request
What’s in the dataset
Clean reference files, ready to join on day one.
The equity security master ships as clean reference files, keyed to the ASID and ready to join your market data on day one.
Affordable by design
Clean identifiers are not optional. So we priced ours like infrastructure, not a luxury.
Take the master alone, or fold it into the full Equities Package when you scale, everything keyed to the same ASID.
Explore the Data
Query the equity security master directly with Python or SQL. Up to a year of production data, no agreement, no credit card needed.
Talk to our team
Core team from the trading side. Integration help, licensing for redistribution, and pipeline design.