fix: correct and enrich 229 ISIN codes in equities database#126
Merged
JerBouma merged 1 commit intoJerBouma:mainfrom Mar 5, 2026
Merged
fix: correct and enrich 229 ISIN codes in equities database#126JerBouma merged 1 commit intoJerBouma:mainfrom
JerBouma merged 1 commit intoJerBouma:mainfrom
Conversation
Cross-referenced ISIN codes from multiple authoritative sources (ESMA regulatory data, Borsa Italiana listings, top-rated Kaggle double-checked datasets) to fix incorrect and fill missing ISINs. Changes: - 82 ISIN corrections (replaced incorrect/obsolete codes) - 147 ISIN additions (filled previously empty fields) - Focused on MIL (Milan) exchange equities verified against Borsa Italiana official data - Fixed 6 suspicious ISINs with country-code mismatches (e.g. non-IT ISINs for Italian companies) PS The situation with equities DB is rather complex. I have reason to suspect that many ISINs are incorrect because they were extracted using overly simplistic or imprecise regex patterns and/or because they were not properly joined/parsed using the "Symbol". However, this is everything I was able to do using authoritative sources related to Borsa Italiana. I believe the entire equities.csv database needs to be reviewed and thoroughly restructured. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Thanks for this, I agree but it simply requires more community involvement. Especially given that this type of data is quite expensive to acquire elsewhere, e.g. a strong up-to-date source is Bloomberg coming in at $2.500 a month. |
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Summary
Cross-referenced ISIN codes from multiple authoritative sources (ESMA regulatory data, Borsa Italiana listings, top-rated Kaggle double-checked datasets) to fix incorrect and fill missing ISINs.
PS
The situation with equities DB is rather complex. I have reason to suspect that many ISINs are incorrect because they were extracted using overly simplistic or imprecise regex patterns and/or because they were not properly joined/parsed using the "Symbol".
However, this is everything I was able to do using authoritative sources related to Borsa Italiana.
I believe the entire equities.csv database needs to be reviewed and thoroughly restructured.