U.S. diversified stock mutual funds gained 0.98% on average in the week ended Nov. 5, according to Lipper Inc. Small-cap portfolios were the sweetest spot of that gain. They outpaced midcap and large-cap stock categories. Among nonleveraged stock mutual funds with at least $100 million in assets, which don’t focus on shorting, the best showing in the latest week was by $1.3 billion Heartland Value Plus Institutional Fund .