Arm Holdings plc American Depositary Shares (ARM) had the highest return last Monday by a mega-cap US stock, returning 5.6%.

ASSET	DATE	% RETURN
Arm Holdings plc American Depositary Shares (ARM)	10/26/2026	5.56%
Analog Devices (ADI)	10/26/2026	3.78%
GE Vernova LLC (GEV)	10/26/2026	3.26%
Texas Instruments (TXN)	10/26/2026	3.18%
Intel (INTC)	10/26/2026	2.88%
RTX (RTX)	10/26/2026	2.86%
Lam Research (LRCX)	10/26/2026	2.58%
Tesla (TSLA)	10/26/2026	2.03%
Cisco Systems (CSCO)	10/26/2026	1.93%
Applied Materials (AMAT)	10/26/2026	1.93%
Arista Networks (ANET)	10/26/2026	1.74%
Palo Alto Networks (PANW)	10/26/2026	1.63%
Advanced Micro Devices (AMD)	10/26/2026	1.62%
Micron Technology (MU)	10/26/2026	1.55%
Taiwan Semiconductor Manufacturing (TSM)	10/26/2026	1.51%
ExxonMobil (XOM)	10/26/2026	1.47%
SK Hynix Inc American Depositary Shares (SKHY)	10/26/2026	1.44%
Broadcom (AVGO)	10/26/2026	1.43%
NVIDIA (NVDA)	10/26/2026	1.36%
Berkshire Hathaway (BRK.A)	10/26/2026	1.35%
Thermo Fisher Scientific (TMO)	10/26/2026	1.34%
Morgan Stanley (MS)	10/26/2026	1.27%
Berkshire Hathaway (BRK.B)	10/26/2026	1.16%
Crowdstrike (CRWD)	10/26/2026	1.07%
Philip Morris International (PM)	10/26/2026	1.03%

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