By Ed Ballard

LONDON--Shares in U.K. semiconducter company Imagination Technologies PLC (IMG.LN) slumped Friday after the investment arm of Intel Corp. (INTC), previously the top shareholder, sold a 9.3% stake.

"Intel Corporation continues to have a business relationship with the company, having licensed several generations of Imagination Technologies' graphics and video processing cores," Intel Capital said in a regulatory filing, adding that the two companies "continue to discuss opportunities to work together."

Intel Capital raised 51.3 million pounds ($87.4 million) through the sale of 25 million shares at 205 pence conducted by Credit Suisse, Jefferies International Ltd. and J.P. Morgan. Intel will keep 13.4 million shares, a 5% stake.

Shares were down 7.2% at 1023 GMT in London, the most of any FTSE-250 company, having earlier dropped as much as 10%. The stock was boosted earlier this week when the Hertfordshire, England-based company reported strong growth in licensing deals. Shares are up 19% for the year to date.

Hopes for the company were boosted in February when Apple Inc. (AAPL) extended a deal to license Imagination's graphics and video intellectual property. Apple is among Imagination's top shareholders with an 8.6% stake according to FactSet.

Intel Capital's sale, which was disclosed late Thursday, came on the same day as a downgrade from analysts at Barclays, who said enthusiasm over the company's long-term prospects masks a weaker outlook for near-term sales.

"Our main area of concern is the inconsistency between a conservative near-term outlook and the level of optimism built into long-term targets," analysts wrote, saying they "struggle to justify" a higher value than 190 pence per share. Barclays advised investors to reduce their holding in the stock.

Shares traded down 16 pence at 209 pence at 1023 GMT.

Write to Ed Ballard at ed.ballard@wsj.com; Twitter: @edmballard

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