Merger news moved stocks last week. An agreement between US BioEnergy Corp. and VeraSun Energy, the third-largest ethanol producer, sent the stock of US BioEnergy up the most. Bidder VeraSun also got a boost, rising 3 percent Thursday and 7.7 percent Friday. MGI Pharma announced Thursday that it would seek strategic alternatives, and hired Lehman Brothers Holdings Inc. to explore a possible sale. Analyst downgrades on Arctic Cat Inc. put a chill on their stock, making it the biggest loser among mid-caps. Large cap (Market cap greater than $1 billion) Last Weekly Avg. 5-day For the week Company price % chg. volume 36 weekly gainers Biggest gainer 9 weekly losers Biggest loser 0 unchanged Most active Mid cap ($100 million to $1 billion) Last Weekly Avg. 5-day For the week Company price % chg. volume 16 weekly gainers Biggest gainer 18 weekly losers Biggest loser 0 unchanged Most active Small cap (less than $100 million) Last Weekly Avg. 5-day For the week Company price % chg. volume 11 weekly gainers Biggest gainer 10 weekly losers Biggest loser 1 unchanged Most active $34.61 36.96 33.09 $9.07 10.67 13.67 $13.70 0.60 2.11 +17.7% -4.0% +5.7% +21.9^ -12.5% +5.9% +19.3% -18.9% +3.4% 2,712,540 627,960 13,909,618 871,155 100,127 1,705,618 18,960 58,625 180,346 MGI Pharma Inc. Fair Isaac Corp. U.S. Bancorp US BioEnergy Corp. Arctic Cat Inc. American Medical Systems Holdings Intricon Inc. Innovex Inc. Navarre Corp.