It’s not often that small companies go to the trouble and expense of moving up to the Big Board of the New York Stock Exchange from the NASDAQ national over-the-counter share trading system, but add-on storage and communications equipment maker EMC Corp, Hopkinton, Massachusetts, has had its application to make the move approved: it says that it has been growing at over 100% a year and has now reached $127m turnover, but that it felt it was not as well known to the largest computer users as it should be many of its customers are high-level data processing managers used to doing business with the likes of IBM, DEC and Hewlett Packard, and as such may feel more comfortable with a Big Board company.