By Shira Ovide And Lisa Fleisher 

Hewlett-Packard Co. said it has filed suit in London against two former senior officials of Autonomy, the U.K. software firm that H-P purchased and then accused of misrepresenting its financial condition.

The Silicon Valley computing giant said the suit seeks $5.1 billion in damages from Michael Lynch, Autonomy's former chief executive, and Sushovan Hussain, its former financial chief.

An H-P spokeswoman Tuesday said it could confirm that a claim form was filed against the two men on Monday, "alleging they engaged in fraudulent activities while executives at Autonomy." She said the company declined to say more "until the proceedings have been served on the defendants."

Mr. Lynch has consistently denied wrongdoing. A spokesman for the former Autonomy executives cited H-P's "false and negligent statements," stating that they would file their own claims against the company for "loss and damage."

Court records in London show H-P filed a claim Monday against Mr. Lynch and Mr. Hussein. The court declined to make the full filing available, and details weren't immediately available on the claims H-P is making.

H-P's $11.1 billion acquisition of Autonomy was controversial from the moment the deal went public. At the time, shareholders said it was a pricey splurge for H-P.

Then a year after the acquisition, H-P took an $8.8 billion write-down for the deal and said H-P was duped into overpaying for Autonomy because of what it said were apparently willfully inflated financial statements at the U.K. software firm.

The U.K.'s Serious Fraud Office investigated the matter for nearly two years, but said in January it was closing the probe because it didn't have sufficient evidence for a "realistic prospect of conviction." The agency said it had ceded jurisdiction in other aspects of the probe to U.S. agencies, saying that their investigation is ongoing.

Write to Shira Ovide at shira.ovide@wsj.com and Lisa Fleisher at lisa.fleisher@wsj.com

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