Corcept Therapeutics (CORT) had the highest return in March 2015 by a large-cap US stock, returning 69.2%.

ASSET	MONTH	% RETURN
Corcept Therapeutics (CORT)	March 2015	69.18%
Sterling Infrastructure (STRL)	March 2015	64.36%
Wayfair (W)	March 2015	41.06%
Kraft Heinz (KHC)	March 2015	35.8%
Trip Group Ltd ADR (TCOM)	March 2015	31.11%
Globalstar, Inc Common Stock (GSAT)	March 2015	29.07%
Summit Therapeutics (SMMT)	March 2015	25.15%
RBC Bearings (RBC)	March 2015	23.11%
Biomarin Pharmaceutical (BMRN)	March 2015	16.47%
Centene (CNC)	March 2015	15.11%
Vicor (VICR)	March 2015	14.98%
Qorvo (QRVO)	March 2015	14.86%
Orix Corp Ads (IX)	March 2015	14.75%
Cooper Companies (COO)	March 2015	14.3%
Novo Nordisk A-S (NVO)	March 2015	13.83%
Comfort Systems USA (FIX)	March 2015	13.29%
CBRE Group Inc Class A (CBRE)	March 2015	12.73%
Elbit Systems (ESLT)	March 2015	12.18%
Five Below (FIVE)	March 2015	12%
ResMed (RMD)	March 2015	11.53%
United Therapeutics (UTHR)	March 2015	11.43%
Skyworks Solutions (SWKS)	March 2015	11.39%
CoreSite Realty (COR)	March 2015	11.24%
Cognex (CGNX)	March 2015	10.67%
Steel Dynamics (STLD)	March 2015	10.6%

Large-cap stocks are treated as having a market cap of $10B+.