UK motoring group the RAC says it has received an approach that could lead to a takeover offer.
The RAC has seen flat demand for its roadside rescue service
Shares in the Buckinghamshire-based motoring services firm rose by nearly 19% on the news, giving it a market value of about £1bn.
It said following recent share price movement, "the board of RAC confirms it has received an approach which may or may not lead to an offer".
The move comes less than a year after the AA was bought for £1.75bn.
The 108-year-old body was founded as the Automobile Club of Great Britain.
In 1999 the by-then Royal Automobile Club was bought for £437m by Lex.
The RAC's 12,000 full members each received £34,000.
At the time Lex said its combination with RAC would create a "cradle-to-grave" motoring service for private and business customers offering car purchase and finance, insurance and warranty, and accident repair and recovery.
On 16 February, RAC announced a renewed push into car insurance, as it posted a 2% rise in 2004 profit.
It said at the time that membership of its roadside recovery scheme was flat and sales at its windscreen replacement arm were down 2%.
It added that it planned to spend £5m this year on marketing financial services such as car insurance and legal cover to its members.
The RAC's wide portfolio of businesses includes the BSM driving school.
It has about 275,000 motor and home policyholders under the RAC Insure brand, and its business services arm includes Lex vehicle leasing - a joint venture with HBOS offering contract hire, fleet management and car finance services.
The firm is also the largest vehicle services provider to the Ministry of Defence, managing more than 14,000 vehicles.