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by neomantra 2505 days ago
The limit for a ticker symbol on NYSE is six characters... from Section 2.1 of the NYSE Symbology spec [1]:

The NYSE defines the symbol into two parts: a root and a suffix. The root constitutes the first part of the symbol and it can be up to six characters (although traditionally, most symbols representing companies only use a three-character root).

That said... in the early 00's, our is_nyse(ticker) function looked like: { return ticker.size() == 3; }

[1] https://www.nyse.com/publicdocs/nyse/data/NYSE_Symbology_Spe...