Palantir Technologies Inc Class A Common Stock (PLTR) has had the highest return this month by a mega-cap US stock, returning 9%.

ASSET	MONTH	% RETURN
Palantir Technologies Inc Class A Common Stock (PLTR)	March 2025	8.98%
UnitedHealth (UNH)	March 2025	8.7%
Shell PLC ADR (SHEL)	March 2025	5.28%
Exxon Mobil (XOM)	March 2025	4.38%
Novartis AG ADR (NVS)	March 2025	4.24%
Chevron (CVX)	March 2025	4.06%
GE Aerospace (GE)	March 2025	2.62%
Toyota Motor Corporation ADR (TM)	March 2025	2.48%
Berkshire Hathaway (BRK.B)	March 2025	2.45%
Berkshire Hathaway (BRK.A)	March 2025	2.23%
Netflix (NFLX)	March 2025	1.45%
ASML Holding NV ADR (ASML)	March 2025	0.65%
Taiwan Semiconductor Manufacturing (TSM)	March 2025	0.25%
McDonald’s (MCD)	March 2025	-0.39%
Alphabet Inc Class A (GOOGL)	March 2025	-0.68%
Philip Morris International (PM)	March 2025	-0.82%
Microsoft (MSFT)	March 2025	-0.92%
Alibaba (BABA)	March 2025	-0.94%
HSBC Holdings PLC ADR (HSBC)	March 2025	-0.96%
Coca-Cola (KO)	March 2025	-1.31%
SAP SE ADR (SAP)	March 2025	-1.84%
International Business Machines (IBM)	March 2025	-1.9%
LIN TV (LIN)	March 2025	-2.16%
NVIDIA (NVDA)	March 2025	-2.27%
Johnson & Johnson (JNJ)	March 2025	-2.39%

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