Israeli digital advertising firm Matomy Media Group raised its stake in Team Internet, a Munich-based direct navigation Internet search company, to 70 percent from 20 percent. Matomy said on Monday this was its largest acquisition ever but did not provide financial details. Matomy, whose clients include American Express, ATT and HSBC, helps advertisers to market goods and services through its network of online publishers. It earns a fee for every transaction completed through its platform so that companies pay only for results in what is known as performance-based advertising.