Applovin (APP) had the highest return in August 2025 by a mega-cap US stock, returning 26.8%.

ASSET	MONTH	% RETURN
Applovin (APP)	August 2025	26.79%
UnitedHealth (UNH)	August 2025	23.65%
Novo Nordisk A-S (NVO)	August 2025	18.29%
Alibaba (BABA)	August 2025	14.35%
Royal Bank of Canada (RY)	August 2025	13.63%
Micron Technology (MU)	August 2025	12.82%
American Express (AXP)	August 2025	12.67%
Alphabet Inc Class A (GOOGL)	August 2025	12.64%
Novartis AG ADR (NVS)	August 2025	12.59%
AbbVie (ABBV)	August 2025	10.78%
Home Depot (HD)	August 2025	10.59%
Apple (AAPL)	August 2025	10.21%
Bank of America (BAC)	August 2025	9.45%
AstraZeneca PLC ADR (AZN)	August 2025	9.37%
Tesla (TSLA)	August 2025	9.03%
Uber Technologies (UBER)	August 2025	8.38%
Morgan Stanley (MS)	August 2025	8.05%
Johnson & Johnson (JNJ)	August 2025	7.85%
Merck (MRK)	August 2025	7.82%
ASML Holding NV ADR (ASML)	August 2025	7.63%
Toyota Motor Corporation ADR (TM)	August 2025	7.53%
Thermo Fisher Scientific (TMO)	August 2025	6.87%
Chevron (CVX)	August 2025	6.46%
HSBC Holdings PLC ADR (HSBC)	August 2025	6.25%
Berkshire Hathaway (BRK.B)	August 2025	6.23%

Mega-cap stocks are treated as having a market cap of $200B+.