Palantir Technologies Inc Class A Common Stock (PLTR) had the best month in 2023 by a mega-cap US stock in May 2023, returning 89.8%.

ASSET	MONTH	% RETURN
Palantir Technologies Inc Class A Common Stock (PLTR)	May 2023	89.81%
Tesla (TSLA)	January 2023	46.21%
NVIDIA (NVDA)	May 2023	35.9%
Palantir Technologies Inc Class A Common Stock (PLTR)	November 2023	35.47%
NVIDIA (NVDA)	January 2023	31.55%
Advanced Micro Devices (AMD)	May 2023	29.86%
Tesla (TSLA)	June 2023	29.21%
Broadcom (AVGO)	May 2023	28.96%
Palantir Technologies Inc Class A Common Stock (PLTR)	July 2023	28.08%
Salesforce (CRM)	November 2023	25.37%
Tesla (TSLA)	May 2023	24.98%
Blackstone (BX)	January 2023	24.95%
Advanced Micro Devices (AMD)	March 2023	24.77%
Salesforce (CRM)	January 2023	24.25%
Advanced Micro Devices (AMD)	December 2023	22.96%
Advanced Micro Devices (AMD)	November 2023	22.91%
GE Aerospace (GE)	January 2023	22.66%
Salesforce (CRM)	March 2023	22.57%
Taiwan Semiconductor Manufacturing (TSM)	January 2023	22.25%
Eli Lilly and (LLY)	August 2023	21.97%
Walt Disney (DIS)	January 2023	21.93%
Broadcom (AVGO)	December 2023	21.56%
Facebook (META)	March 2023	21.39%
Facebook (META)	January 2023	21.29%
Blackstone (BX)	November 2023	21.19%

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