Centrais Electricas Brasileiras (EBR) had the highest return in October 2018 by a large-cap US stock, returning 58.5%.

ASSET	MONTH	% RETURN
Centrais Electricas Brasileiras (EBR)	October 2018	58.52%
Centrais Elétricas Brasileiras SA - Eletrobrás (EBR.B)	October 2018	56.44%
Petróleo Brasileiro SA - Petrobras (PBR.A)	October 2018	40.74%
Petroleo Brasileiro Petrobras SA ADR (PBR)	October 2018	34.08%
Banco Bradesco SA ADR (BBD)	October 2018	29.98%
Banco Santander Brasil SA ADR (BSBR)	October 2018	29.65%
Banco Bradesco S/A ADR (BBDO)	October 2018	26.8%
Companhia de Saneamento Basico do Estado de Sao Paulo SABESP ADR (SBS)	October 2018	25.34%
Itau Unibanco Banco (ITUB)	October 2018	20.16%
Telefonica Brasil SA ADR (VIV)	October 2018	19.1%
Cboe Global Markets (CBOE)	October 2018	18.17%
Embraer SA ADR (ERJ)	October 2018	13.68%
Keurig Dr Pepper (KDP)	October 2018	12.37%
Omnicom (OMC)	October 2018	11.34%
Hormel Foods (HRL)	October 2018	11.07%
Tesla (TSLA)	October 2018	10.32%
McCormick (MKC)	October 2018	9.51%
Gold Fields Ltd ADR (GFI)	October 2018	9.46%
ICICI Bank (IBN)	October 2018	9.46%
Walgreens Boots Alliance (WBA)	October 2018	9.45%
AngloGold Ashanti (AU)	October 2018	8.79%
Philip Morris International (PM)	October 2018	8.18%
Comcast (CMCSA)	October 2018	7.92%
Altria (MO)	October 2018	7.79%
Verizon Communications (VZ)	October 2018	7.67%

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