How Linux mastered Wall Street

Due to a reporting error, the story "How Linux mastered Wall Street," posted Monday, confounded two Unix operating systems as a single entity.

The first sentence of the fifth paragraph has been corrected and should read as follows:

As late as 2007, Wall Street exchanges were still largely run on Unix, such as Hewlett-Packard's HP-UX, IBM's AIX and Sun Microsystems' Solaris.