What is the difference between NYSE and NASDAQ securities?

There are some trivial listing requirements differences, but they all have to have their SEC paperwork up to date. Most companies on either could qualify for the other, so it's really a choice for companies. Older companies tend to be listed on the NYSE because NASDAQ didn't exist when they were looking for an exchange listing and the NYSE makes it hard for companies to leave. The NYSE has a broader base of more sectors than the NASDAQ which is heavily weighted to Tech Stocks. The traditional difference between them was order systems that are now converging on all electronic order s. The NASDAQ was more forward thinking in recent years when it came to leveling the field for the individual investor, but the NYSE has outgrown it's legacy tradition of being exclusionary. There are still differences in licensing requirements, fees and some rules, but the difference between them is becoming less and less every year.