* STOXX 600 down 0.1 pct
* Gemalto plummets 16 pct on profit warning, broker downgrades
* Cartel concerns hit carmakers
* Airlines fall as Ryanair flags fares to fall in summer
* Julius Baer jumps on biggest inflows since fin crisis (ADVISORY- Follow European and UK stock markets in real time on the Reuters Live Markets blog on Eikon - see cpurl://apps.cp./cms/?pageId=livemarkets)
By Helen Reid
LONDON, July 24 (Reuters) - European shares dipped on Monday with the autos sector hitting its lowest level this year after anti-trust regulators opened an investigation into regional carmakers while price war worries hurt airlines.
The pan-European STOXX 600 fell 0.1 percent as gains in the heavyweight financials sector helped offset losses elsewhere. Euro zone bluechips fell 0.2 percent.
Gemalto plummeted as much as 17 percent, the worst performer on the day, after the digital security company warned on profits for the fourth time since October on Friday after trading, citing continued weakness in its SIM-card and U.S. payments operations.
"We continue to see both these businesses with double-digit (sales) declines given our view of limited unit growth and pricing pressures," said Credit Suisse analysts, cutting their target price. Societe Generale and Natixis slashed their recommendations on the stock.
Shares in carmakers fell after European Union antitrust regulators said they were investigating allegations of a cartel in the industry.
Volkswagen, Peugeot, Daimler , Renault and BMW all fell 1.2 to 2.5 percent, sending the autos index down 1.8 percent to a seven-month low, the worst-performing sector.
"It's clearly bad for sentiment, which was already burned by the emissions scandal," said Michael Punzet, autos analyst at DZ Bank.
"We expect high volatility related to the upcoming newsflow. Investors are clearly aware of the risks and they are selling the stocks."
Jefferies analysts said: "One cannot rule out material fines should anti-competitive behaviour be confirmed, up to the maximum allowed under EU rules." That would be 10 percent of annual turnover, they added.
Budget airline Ryanair fell 4.7 percent, a top European loser, after it warned summer fares would face sharp cuts, though it said profit soared 55 percent in its first quarter.
Rivals Wizz Air and EasyJet sank 2 to 3 percent, while Lufthansa dipped 1.1 percent.
Switzerland's third largest private bank Julius Baer led gainers, up 7.5 percent after reporting its biggest inflows since the financial crisis for its first half, helped by a push to recruit more private bankers.