Why wouldnt change? SMH
This number provides a vital piece of information for searching out a security; it's like stock DNA. Each security has a unique and individual number (the CUSIP), and changes and splits are recorded accordingly. That is, every time a security changes its name, splits or does anything that will affect its stock certificate, a new number is assigned to it. By doing a search starting from the original number, we can find out the security's final/current equivalent. Outside North America, other numbering systems such as SEDOL or ISIN are used. PVEC