CorMedix (CRMD) had the highest return in March 2015 by a small-cap US stock or small-cap US stock, returning 92.2%.

ASSET	MONTH	% RETURN
CorMedix (CRMD)	March 2015	92.19%
Amarin (AMRN)	March 2015	51.95%
Esperion Therapeutics (ESPR)	March 2015	48.66%
eXp World (EXPI)	March 2015	48.15%
NioCorp Developments Ltd Common Stock (NB)	March 2015	45.05%
Capricor Therapeutics (CAPR)	March 2015	44.87%
Prothena (PRTA)	March 2015	43.06%
Cryoport (CYRX)	March 2015	41.18%
Five9 (FIVN)	March 2015	41.12%
Envela (ELA)	March 2015	41.12%
Herbalife Nutrition (HLF)	March 2015	38.38%
Oxford Industries (OXM)	March 2015	37.56%
Verastem (VSTM)	March 2015	36.69%
Iovance Biotherapeutics (IOVA)	March 2015	34.56%
E W Scripps Co Class A (SSP)	March 2015	28.82%
Clearpoint Neuro (CLPT)	March 2015	26.59%
Lightwave Logic (LWLG)	March 2015	26.51%
Dynavax Technologies (DVAX)	March 2015	25.66%
Gray Television (GTN)	March 2015	25.64%
Gray Television (GTN.A)	March 2015	25.32%
Astrana Health (ASTH)	March 2015	25%
Geron (GERN)	March 2015	24.42%
Gilat Satellite Networks (GILT)	March 2015	23.47%
JinkoSolar (JKS)	March 2015	23.21%
Green Plains Renewable Energy (GPRE)	March 2015	22.9%

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