*宏盟集团股价上涨15%，创1986年以来最大涨幅，因第四季度营收超出预期。

Group 1 - The core point of the article is that Omnicom Group's stock price surged by 15%, marking the largest increase since 1986, due to fourth-quarter revenue exceeding expectations [1] Group 2 - The significant rise in stock price reflects strong market confidence in the company's performance [1] - The fourth-quarter revenue performance indicates robust demand and effective management strategies within the company [1]