NEW YORK—Hewlett-Packard Co. shares fell 7.6% from its close Friday on the New York Stock Exchange, as Wall Street revalues the information technology giant after the surprising departure of Chief Executive Mark Hurd.

The stock’s NYSE drop Monday is a catch-up to a similar after-hours decline that already occurred after Friday’s late-afternoon news.

Some data vendors have been showing that the stock declined occurred in Friday’s regular-hours NYSE session, not after-hours, but that is because of a trade-reporting mistake. The Direct Edge exchange on Monday announced that its after-hours H-P trades were inadvertently marked “regular” hours instead of

after-hours. Because such after-hours trades got included into H-P’s composite price, the stock’s closing price is being listed as $41.85 at many locations.

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