Updated from 2:51 p.m. EDT

Small-cap stocks trailed the rest of the market Monday, but among the substantial gainers was Top Tankers ( TOPT).

Cantor Fitzgerald upgraded Top Tankers' stock to buy from hold as the Greece-based company, which primarily ships refined petroleum products and crude oil, agreed to buy three drybulk panamax vessels for some $222 million. That doubles the company's drybulk fleet and should be accretive to 2008 earnings, the company said. Shares closed up 25.3% to $6.25.

Addvantage ( AEY) leapt 22.1% to $5.96 after fiscal third-quarter earnings ballooned to $2 million, or 19 cents a share, vs. 11 cents a share last year, on 33.1% higher revenue of $17.6 million. The analyst who follows the Oklahoma cable-television-equipment distributor was looking for 15 cents a share on revenue of $16.5 million.

Another Oklahoma-based outfit, Pre-Paid Legal Services ( PPD), bounced 14.8% on word it plans to begin a national media campaign in late September. Shares closed up $6.95 to $53.93.

Sciele Pharma ( SCRX) was also in the green after the Food and Drug Administration approved fenofibrate, LifeCycle Pharma's formulation of Oscient Pharmaceutical's ( OSCI) cholesterol drug Antara, generically called fenofibrate. Sciele has an exclusive license to market the approved doses in the U.S., Canada and Mexico. Sciele shares climbed 53 cents, or 2.3%, to $23.37.

On the other hand, World Fuel Services ( INT) lost another 5.5% after Calyon Securities lowered the Miami-based company to add from buy following lower-than-expected second-quarter earnings, which the company released after the close Thursday. The fuel-products distributor closed at $36.85.

Elsewhere, Briggs & Stratton ( BGG) was still sliding on Friday's downgrade to underperform at Robert W. Baird. The Wauwatosa, Wis., maker of air-cooled gasoline engines and other products gave up 4.6% to $27.98.

The Russell 2000 lost 1.1% to 779.81; the S&P SmallCap 600 Index shed 0.9% to 409.86.