Advanced Micro Devices (AMD) had the highest return in August 2008 by a US stock in the S&P 500 (GSPC), returning 47.7%.

ASSET	MONTH	% RETURN
Advanced Micro Devices (AMD)	August 2008	47.65%
Align Technology (ALGN)	August 2008	31.19%
Axon Enterprise (AXON)	August 2008	28.97%
Ralph Lauren Corp Class A (RL)	August 2008	28.44%
Live Nation Entertainment (LYV)	August 2008	27.08%
Super Micro Computer (SMCI)	August 2008	25.41%
United Airlines (UAL)	August 2008	24.97%
ResMed (RMD)	August 2008	24.27%
Lowe's Companies (LOW)	August 2008	20.55%
Monster Beverage (MNST)	August 2008	20.22%
American Water Works (AWK)	August 2008	19.51%
Keurig Dr Pepper (KDP)	August 2008	18.86%
F5 Networks (FFIV)	August 2008	18.03%
Nasdaq (NDAQ)	August 2008	17.59%
Masco (MAS)	August 2008	17.29%
PulteGroup (PHM)	August 2008	17.02%
Target (TGT)	August 2008	16.84%
Mohawk Industries (MHK)	August 2008	16.21%
Hologic (HOLX)	August 2008	15.77%
Fidelity National Information Services (FIS)	August 2008	15.67%
KeyCorp (KEY)	August 2008	15.66%
Cigna (CI)	August 2008	15.4%
Moodys (MCO)	August 2008	15.28%
MGM Resorts International (MGM)	August 2008	15.23%
Vulcan Materials (VMC)	August 2008	15.03%