The $991 million Delaware Smid Cap Growth Fund ( DFCIX) has advanced 14.2% this year, including 3.9% over the past three months. Weight Watchers International ( WTW), at 6.5% of the fund, is its largest holding. Its shares are up 95% this year. The company offers a variety of weight-management products and services that encourage healthy weight loss through exercise, nutrition and portion control. Polycom ( PLCM), the second-largest holding of the fund at 5.3%, is up 51% this year. It makes voice- and video-communications equipment. Shares of Terradata ( TDC), which make up 2.4% of fund assets, are up 40% this year. The company is focused on developing and commercializing data warehousing solutions for large corporations and government agencies.