CyberArk Software (CYBR) had the highest return in February 2015 by a large-cap US stock, returning 73%.

ASSET	MONTH	% RETURN
CyberArk Software (CYBR)	February 2015	73%
First Solar (FSLR)	February 2015	39.98%
TKO (TKO)	February 2015	35.53%
Martin Marietta Materials (MLM)	February 2015	32.18%
Freeport-McMoran Copper & Gold (FCX)	February 2015	27.39%
ON Semiconductor (ON)	February 2015	27.25%
Primo Brands (PRMB)	February 2015	27.04%
Paylocity Holdng (PCTY)	February 2015	26.92%
Intracellular Th (ITCI)	February 2015	25.95%
EPAM Systems (EPAM)	February 2015	25.7%
Grupo Financiero Galicia SA ADR (GGAL)	February 2015	25.36%
Molina Healthcare (MOH)	February 2015	25.08%
Broadcom (AVGO)	February 2015	23.6%
Sony (SONY)	February 2015	23.35%
Mitsubishi UFJ Financial Group Inc ADR (MUFG)	February 2015	23.21%
Teck Resources Ltd Class B (TECK)	February 2015	23.12%
Orix Corp Ads (IX)	February 2015	23.07%
Paycom Soft (PAYC)	February 2015	22.29%
Booking (BKNG)	February 2015	22.28%
Salesforce (CRM)	February 2015	21.98%
Companhia de Saneamento Basico do Estado de Sao Paulo SABESP ADR (SBS)	February 2015	21.15%
HubSpot (HUBS)	February 2015	21%
ICON (ICLR)	February 2015	20.94%
Monster Beverage (MNST)	February 2015	20.83%
XPO Logistics (XPO)	February 2015	20.01%

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