By Lisa Fleisher 

LONDON--British authorities said they had closed a nearly two-year-old probe into alleged accounting issues related to Hewlett-Packard Co.'s $11-billion purchase of U.K. software company Autonomy in 2011--representing a home-court victory for Autonomy founder Mike Lynch.

Mr. Lynch and H-P have battled publicly over the sale, and over who was to blame for billions of dollars in H-P write-downs in the wake of the deal. U.S. officials continue to investigate, the U.K.'s Serious Fraud Office said in a short statement Monday.

The SFO said it didn't have enough evidence related to some allegations for a "realistic prospect of conviction" in the investigation. The agency said it had ceded jurisdiction in other aspects of the probe to the U.S., saying that the American investigation is "ongoing."

H-P purchased Autonomy--a fast-rising software company that specialized in data analysis and was a darling of the U.K. tech scene--in a bid to remake itself as a software-focused company. Just over a year later, H-P wrote off $8.8 billion related to the purchase, including $5 billion that it said was related to "serious accounting improprieties" and misrepresentations by Autonomy management, including Mr. Lynch.

H-P said Autonomy management misled the U.S. company into thinking that much of Autonomy's revenue came from software sales, rather than money-losing hardware sales. The company also accused Autonomy of improperly accounting for deals to inflate revenue ahead of the sale.

Mr. Lynch has publicly fought back against H-P, asking the company to provide more details about the claims. He said Autonomy's accounting conformed to international accounting practices. On behalf of other senior Autonomy management, he has periodically posted documents online that he says raise questions about the motivation behind the write-downs, including alleging that H-P executives knew they were overpaying and had unrealistic expectations for Autonomy revenue.

H-P referred its fraud allegations to the U.S. Justice Department and the Securities and Exchange Commission. Britain's SFO started its own investigation in early 2013, after being asked to by H-P, the agency said Monday.

The Justice Department declined to comment, while the SEC didn't immediately respond to a request for comment.

Amid the probes, Mr. Lynch has reinvented himself--at least in the U.K.--as a tech-focused, venture-capital investor and a tech adviser to the government.

On Monday, Mr. Lynch welcomed the closure of the investigation by U.K. authorities. H-P "made allegations of a $5 billion fraud, and presented the case in public as a slam dunk," he said in his own statement.

For H-P, the move could reduce H-P Chief Executive Meg Whitman's ammunition in the company's public-relations campaign against Autonomy management. H-P remains embroiled in litigation and regulatory scrutiny over the Autonomy deal. Apart from the DOJ and SEC probes, H-P is trying to settle shareholder litigation over how the company's board and advisers handled the Autonomy deal.

An H-P spokeswoman said the company "remains committed to holding the architects of the Autonomy fraud accountable. As the SFO made clear, the U.S. authorities are continuing their investigation and we continue to cooperate with that investigation."

Shira Ovide in San Francisco contributed to this article.

Write to Lisa Fleisher at lisa.fleisher@wsj.com

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