Incorrect `exchange` code "ASE" assigned to NYSE / NYSE American securities (BRK.B, BF.B, ...)

[Predatrador]

Summary

The exchange column in equities.csv reports "ASE" for ~430 securities that are actually listed on NYSE main board (NYQ per Yahoo Finance), not on NYSE American. The value is also ambiguous as a short code: ASE collides with the ISO 10383 ACRONYM for Athens Stock Exchange (MIC ASEX).

Reproduction

import financedatabase as fd
eq = fd.Equities()
df = eq.select()
sample = df.loc[["BRK.B", "BF.B", "ARX", "ALH"], ["name", "exchange", "country"]]
print(sample)

Output:

symbol	name	exchange	country
BRK.B	Berkshire Hathaway Inc. Class B	ASE	United States
BF.B	Brown-Forman Corp. Class B	ASE	United States
ARX	Aeolus Pharmaceuticals	ASE	Cayman Islands
ALH	…	ASE	United States

Cross-check via yfinance:

import yfinance as yf
for sym in ["BRK-B", "BF-B", "ARX", "ALH"]:
    info = yf.Ticker(sym).info
    print(sym, info.get("exchange"), info.get("fullExchangeName"))

Output:

BRK-B NYQ NYSE
BF-B  NYQ NYSE
ARX   NYQ NYSE
ALH   NYQ NYSE

All four are NYSE main board listings, not NYSE American.

Why this matters

1. Wrong segment — these securities are on NYSE (MIC XNYS), not NYSE American (MIC XASE). Berkshire Hathaway B is unquestionably a NYSE main board listing.
2. Ambiguous short code — "ASE" is also an ISO 10383 ACRONYM for Athens Stock Exchange (ASEX, GR). Downstream consumers that resolve exchange against ISO 10383 will land on Athens, which is materially wrong.
3. Scope — the issue affects ~430 rows in equities.csv, including widely-tracked symbols (BRK.B, BF.B). The country distribution is heterogeneous (US, GR, CA, BR, CN, …), suggesting a default fallback rather than a deliberate per-row classification.

Suggested resolution

Either:

• Re-classify these rows with the correct exchange code (NYSE / NYQ / ISO MIC XNYS), or
• If "ASE" is intended as FinanceDatabase's internal code for NYSE American, document it explicitly in the README/exchange-code table and split off the rows that actually belong to NYSE main board.

Happy to provide the full list of 430 affected symbols if useful.

Context

Encountered while building a canonical instrument identifier pipeline that consumes both FinanceDatabase and ISO 10383. The collision between FD "ASE" and ISO ACRONYM "ASE" made it surface immediately.

Thanks for the great library.

[JerBouma]

Thanks for the heads-up, I'll do some checks if this includes all of the 430 and then make the adjustment. Will do this next week.

[dokson]

see #143