Gerdau SA ADR (GGB) had the highest return in March 2016 by a large-cap US stock, returning 93.5%.

ASSET	MONTH	% RETURN
Gerdau SA ADR (GGB)	March 2016	93.49%
Petroleo Brasileiro Petrobras SA ADR (PBR)	March 2016	59.14%
Banco Bradesco S/A ADR (BBDO)	March 2016	45.96%
ArcelorMittal SA ADR (MT)	March 2016	45.49%
Block (XYZ)	March 2016	44.15%
Coeur Mining (CDE)	March 2016	43%
Equinox Gold (EQX)	March 2016	41.18%
Natera (NTRA)	March 2016	40.41%
Ovintiv (OVV)	March 2016	39.75%
Devon Energy (DVN)	March 2016	38.75%
Banco Bradesco SA ADR (BBD)	March 2016	38.6%
Vale SA ADR (VALE)	March 2016	36.69%
Energy of Minas Gerais Co DRC (CIG.C)	March 2016	36.07%
Itau Unibanco Banco (ITUB)	March 2016	35.48%
Huazhu (HTHT)	March 2016	35.06%
Hewlett Packard Enterprise (HPE)	March 2016	32.59%
Advanced Micro Devices (AMD)	March 2016	31.94%
Freeport-McMoran Copper & Gold (FCX)	March 2016	31.89%
Cemex SAB de CV ADR (CX)	March 2016	30.23%
Ares Management (ARES)	March 2016	30.01%
Telefonica Brasil SA ADR (VIV)	March 2016	29.3%
Canadian Natural Resources (CNQ)	March 2016	28.86%
Teck Resources Ltd Class B (TECK)	March 2016	27.04%
APA (APA)	March 2016	26.88%
Banco Santander Brasil SA ADR (BSBR)	March 2016	26.36%

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