By Rory Gallivan

LONDON--Wolfson Microelectronics PLC (WLF.LN), a supplier of audio technology for smartphones, Wednesday said fourth-quarter revenue will be held back by cutbacks at an unnamed major customer.

Wolfson, which designs chips for functions such as noise cancellation and increasing battery life, expects fourth-quarter revenue of between $40 million and $50 million, which broker Citi says is below previous average consensus estimates of $58.1 million.

Wolfson said it has been hurt by "the cancellation of product programmes at a major customer following a strategic review of its business," adding that other customers have delayed "key programmes" from the fourth quarter of 2013 to the first half of 2014.

Brokers Citi and Numis said they believe that the customer that cancelled product programs is the Canadian handset manufacturer BlackBerry Ltd. (BBRY).

Wolfson was unavailable for comment.

Blackberry, which has been hit by people using devices such as Apple Inc.'s (AAPL) iPhone at work rather than their Blackberries, last month reported a sharp fall in quarterly revenue amid poor sales for its Z10 smartphone. It plans to cut jobs and has agreed to be taken over by a consortium led by its biggest shareholder.

Wolfson said it expects the shortfall in its fourth-quarter revenue to be mitigated by other customers continuing with product releases in 2014.

In a short trading statement, it also said revenue for the third quarter ended Sept. 29 is estimated at around $44 million, in line with its previous prediction of $40 million to $50 million. The largest customer accounted for 35% of third quarter revenue, Wolfson said.

Citi said it believes Wolfson's biggest customer is the South Korean device manufacturer Samsung.

-Shares at 0929 GMT, down 25 pence, or 14%, at 150 pence valuing the company at GBP203.7 million.

Write to Rory Gallivan at rory.gallivan@wsj.com; Twitter: @RoryGallivan

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