Mitek Systems (MITK) had the highest return between 2009 and 2011 by a small-cap US stock, returning 8,962.5%.

ASSET	YEARS	% RETURN
Mitek Systems (MITK)	2009-2011	8,962.5%
Metalla Royalty & Streaming (MTA)	2009-2011	7,738.55%
eGain (EGAN)	2009-2011	2,664%
TriMas (TRS)	2009-2011	1,219.88%
Acacia Research (ACTG)	2009-2011	1,093.13%
United States Antimony (UAMY)	2009-2011	1,042.86%
Amarin (AMRN)	2009-2011	985.51%
Galectin Therapeutics (GALT)	2009-2011	966.67%
Vanda Pharmaceuticals (VNDA)	2009-2011	907.41%
Red Cat (RCAT)	2009-2011	871.43%
Allot Communications (ALLT)	2009-2011	821.21%
IDT (IDT)	2009-2011	800.49%
Virtus Investment Partners (VRTS)	2009-2011	744.56%
Clearwater Paper (CLW)	2009-2011	743.84%
HealthStream (HSTM)	2009-2011	719.98%
MGP Ingredients (MGPI)	2009-2011	660.97%
Clearfield (CLFD)	2009-2011	604.63%
Americas Silver (USAS)	2009-2011	544.51%
Newtek Business Services (NEWT)	2009-2011	501.78%
Valhi (VHI)	2009-2011	490.81%
Sturm Ruger (RGR)	2009-2011	490.14%
Standard Motor Products (SMP)	2009-2011	482.46%
Oxford Industries (OXM)	2009-2011	462.81%
Baytex Energy (BTE)	2009-2011	460.54%
La-Z-Boy (LZB)	2009-2011	448.4%

Small-cap stocks are treated as having a market cap between $300M and $2B.