QXO (QXO) had the lowest return on October 19 by a large-cap US stock, returning -7.4%.

ASSET	DATE	% RETURN
QXO (QXO)	10/19/2026	-7.4%
Cerebras Systems Inc Class A Common Stock (CBRS)	10/19/2026	-7.21%
CoreWeave, Inc Class A Common Stock (CRWV)	10/19/2026	-7.15%
Flex (FLEX)	10/19/2026	-5.48%
RB Global (RBA)	10/19/2026	-5.42%
NRG Energy (NRG)	10/19/2026	-5.09%
Sea (SE)	10/19/2026	-4.87%
IONQ (IONQ)	10/19/2026	-4.85%
Evercore Partners (EVR)	10/19/2026	-4.82%
Nextpower (NXT)	10/19/2026	-4.72%
Constellation Energy (CEG)	10/19/2026	-4.58%
Coherent (COHR)	10/19/2026	-4.57%
Frontline (FRO)	10/19/2026	-4.48%
Astera Labs (ALAB)	10/19/2026	-4.46%
Bending Spoons SpA (BSP)	10/19/2026	-4.44%
Celestica (CLS)	10/19/2026	-4.37%
Lumentum (LITE)	10/19/2026	-4.35%
Millicom International Cellular (TIGO)	10/19/2026	-4.24%
Stifel Financial (SF)	10/19/2026	-4.23%
INNIO NV Ordinary Shares (INIO)	10/19/2026	-4.19%
Globalfoundries (GFS)	10/19/2026	-4.14%
Coinbase Global (COIN)	10/19/2026	-4.06%
Encompass Health (EHC)	10/19/2026	-4.01%
Circle Internet (CRCL)	10/19/2026	-3.95%
Quanta Services (PWR)	10/19/2026	-3.93%

Large-cap stocks are treated as having a market cap of $10B+.