Iron Mountain to join the S&P 500 index

Standard & Poor’s said it will add Boston-based Iron Mountain Inc. to the S&P 500 index, replacing UST Inc.

Iron Mountain, a data storage and protection company, is expecting 2008 revenue of over $3 billion. Its addition to the S&P 500 sent its shares up in after-hours trading, rising $1.66, or 8.4 percent, to $21.49. They had closed down 14 cents at $19.83 in the regular session.

UST, the US market leader for smokeless tobacco, is being acquired by Altria Group Inc. in a deal expected to close next month.
(Associated Press)