Wolfson Microelectronics was back in profit in the third quarter helped by a contract with a 'new leading consumer electronics customer' widely believed to be Apple.
Revenues increased 32% on the previous quarter and 31% year-on-year to $53m.
Underlying operating profit improved to $3.4m, from a $1.3m loss in the second quarter and a $0.7m loss the year before.
However margins slipped to 47.5%, from 49.7% in the same quarter of 2011.
The company said the reasons for the drop included the impact of product mix and a high volume product reaching volume price breaks quicker than anticipated.
Wolfson's numbers were boosted by sales into mobile phones growing by 71% and tablet computers by 88% year-on-year.
But this growth was moderated by reduced sales in gaming and home entertainment.
The company remained coy about a widely reported new relationship with Apple.
The statement noted it had bagged "a new leading consumer electronics customer in a smartphone accessory".
Technology experts say this refers to a Wolfson audio chip in a new adapter for the iPhone 5 - a welcome development for the firm, which was dropped by Apple several years ago.
Chief Executive Mike Hikey said his firm's growth was being driven by the increasing adoption of Wolfson's Audio Hubs and MEMS microphone products by brand-leading mobile phone and tablet computer manufacturers.
"We expect this trend to continue into the fourth quarter, with incremental revenue from product adoptions supporting growth in full-year revenue and profit despite persistent macro-economic headwinds," he said.
Auto dealership operator Pendragon reported profits were up in the third quarter as used car sales continued to form the backbone of sales.
The firm said underlying trading performance remained in line with expectations for the full year.
Operating profit was up by £1.5m in quarter three compared with the prior year, including growth of £0.4m at its wholesale business, Quicks. Aftersales turnover was flat compared to 2011.
Pendragon said its gross profit margin of 60% was in line with the prior quarter, however overall gross profit was marginally down.
Like-for-like sales of used cars were up by 2.8%, with profit on those sales 11.7% ahead of the previous year.
The firm did not give a three month figure for new sales, instead saying that UK new retail sales, excluding Motability, for the nine months to the end of September increased by 12.3%.
"Used performance continues to be a differentiator for the group and we believe this will continue in the final quarter with further recovery in used margin," the trading statement said.
"The new retail car market has performed ahead of the comparator period throughout the year and we expect that to continue in the fourth quarter. Aftersales performance remains resilient."
It added that progress on debt reduction was in line with expectations for the year end.