(Adds details, background)
FRANKFURT, Nov 18 (Reuters) - German automotive supplier Beru generated first-half operating profit of 22.2 million euros ($28.94 million), it said on Thursday, missing analyst expectations as one-off charges weighed.
A Reuters survey of 10 analysts had on average expected operating profit of 26 million euros in the six months to Sept. 30, barely changed from 24 million euros a year earlier.
U.S. car parts grouphas secured a majority stake in the diesel cold-start technology specialist and is offering to buy out remaining investors in a deal that values Beru at 621 million euros.
Beru said one-off charges of 4.2 million related to takeover advisory fees and the departure of production chief Bernhard Herzig in April had hit results.
Beru reiterated its forecast that it will boost sales and operating earnings excluding one-off items by 13 percent in the year to March as it benefits from rising demand for diesel-powered cars.
"Including these extraordinary costs, Beru aims for an operating profit of at least 59 million euros," it said.
In September it raised its forecast for earnings growth from its earlier goal of 10 percent after it bought French spark plug business Eyquem, which it will fully consolidate this year for the first time.
Beru shares trade at nearly 17 times estimated earnings for this year, a premium to the average of 12.9 times in the German car sector, according to Reuters data.
They closed on Wednesday at 68.80 euros, just above the 67.90 euroshas offered for outstanding stock.