TechTarget Inc. (Nasdaq:TTGT), Tower Bancorp Inc. (Nasdaq:TOBC) and Citi Trends Inc. (Nasdaq:CTRN) are among the biggest percentage losers in Thursday's trading among companies with market capitalizations under $1 billion.

Also included among the results: Cardiovascular Systems Inc. (Nasdaq:CSII), Medicinova Inc. (Nasdaq:MNOV), C&F  Financial Corp. (Nasdaq:CFFI), Williams Controls Inc. (Nasdaq:WMCO), Cyberonics Inc. (Nasdaq:CYBX) and BankAtlantic Bancorp Inc. (Nasdaq:BBX).

Celera Corp. (Nasdaq:CRA), iRobot Corp. (Nasdaq:IRBT) and NetGear Inc. (Nasdaq:NTGR) are among the biggest percentage losers in Thursday's trading among companies with market capitalizations under $1 billion.

Also included among the results: American River Bankshares (Nasdaq:AMRB), Medicinova Inc. (Nasdaq:MNOV), Vasco Data Security International Inc. (Nasdaq:VDSI), MasTec Inc. (Nasdaq:MTZ), Whitney Holding Corp. (Nasdaq:WTNY) and Northeast Community Bancorp Inc. (Nasdaq:NECB).

Medicinova Inc. (Nasdaq:MNOV), Biocryst Pharmaceuticals Inc. (Nasdaq:BCRX) and JDA Software Group Inc. (Nasdaq:JDAS) are among the new 52-week highs in Tuesday's trading among companies with market capitalizations under $1 billion.

Also included among the results: Lannett Co Inc. (Nasdaq:LCI), RINO International Corp. (Nasdaq:RINO), Dorman Products Inc. (Nasdaq:DORM), Intellon Corp. (Nasdaq:ITLN), Fuqi International Inc. (Nasdaq:FUQI) and NeurogesX Inc. (Nasdaq:NGSX).

JDA Software Group Inc. (Nasdaq:JDAS), Medicinova Inc. (Nasdaq:MNOV) and Biocryst Pharmaceuticals Inc. (Nasdaq:BCRX) are among the biggest percentage gainers in Tuesday's trading among companies with market capitalizations under $1 billion.

Also included among the results: WNS Holdings Ltd. (Nasdaq:WNS), Amerigon Inc.(Nasdaq:ARGN), IncrediMail Ltd. (Nasdaq:MAIL), Hawk Corp. (Nasdaq:HWK), Protalix BioTherapeutics Inc. (Nasdaq:PLX) and Spectrum Pharmaceuticals Inc. (Nasdaq:SPPI).

CNinsure Inc. (Nasdaq:CISG), Medicinova Inc. (Nasdaq:MNOV) and Sharps Compliance Corp. (Nasdaq:SMED) are among the new 52-week highs in Monday's trading among companies with market capitalizations under $1 billion.

Also included among the results: Amcon Distributing Co. (Nasdaq:DIT), Destination Maternity Corp. (Nasdaq:DEST), Young Innovations Inc. (Nasdaq:YDNT), Medifast Inc. (Nasdaq:MED), Universal Forest Products Inc. (Nasdaq:UFPI) and Health Fitness Corp. (Nasdaq:FIT).

Sturm, Ruger & Co. (NYSE: RGR), Triad Guaranty Inc. (Nasdaq: TGIC) and Barrett Business Services, Inc. (Nasdaq: BBSI) are among the biggest percentage losers in Thursday's trading among companies with market capitalizations under $750 million.

Here are today's biggest percentage losers:

Shares of MediciNova, Inc. (Nasdaq: MNOV) are sagging this morning in pre-market trading after the a biopharmaceutical company said that its Phase IIa trial for the treatment of insomnia failed.

Shares of MediciNova (MNOV) slipped 9.4%, or $0.70, to $6.75 in pre-market trading. Shares of MediciNova have been trading in the range of $6.35 to $16.12 for the 52 weeks.