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I found that for example ISIN have following rules:

Merger and acquisition: Old ISINs for stock become inactive and are replaced by securities with a new ISIN. Bonds only need new ISINs if old ones are exchanged for new ones.

So ISIN could be changed for a company.

I suppose the same rules are for CUSIP/SEDOL (an i right?)

Is there any way to link the new ISIN (CUSIP/SEDOL) with the old one? I mean when some companies were merged, and i have a ISIN of the new company - how can i see which companies the new company consists of (get ISINS(CUSIP/SEDOL) of initial companies)?

The same is for all ISIN (CUSIP/SEDOL) histories? Is it possible to get all ISINs for a company (for all periods)?

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  • $\begingroup$ P.S. Could someone tell in which cases CUIP is changed? Is it Name change or it could be changed manually without a reason? $\endgroup$ – kban Dec 10 '19 at 7:33

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