Carnival (CCL) had the lowest return in October 2021 by a US stock in the S&P 500 (GSPC), returning -15%.

ASSET	MONTH	% RETURN
Carnival (CCL)	October 2021	-15%
Southwest Airlines (LUV)	October 2021	-12.07%
DaVita HealthCare Partners (DVA)	October 2021	-11.63%
Pinnacle West Capital (PNW)	October 2021	-11.29%
International Business Machines (IBM)	October 2021	-11.28%
PayPal (PYPL)	October 2021	-11.04%
Delta Air Lines (DAL)	October 2021	-10.97%
Universal Health Services (UHS)	October 2021	-10.63%
Frank's International (FI)	October 2021	-9.67%
Fidelity National Information Services (FIS)	October 2021	-9.55%
T-Mobile US (TMUS)	October 2021	-9.48%
Global Payments (GPN)	October 2021	-9.37%
Paramount Global Class B (PARA)	October 2021	-9.18%
Lamb Weston (LW)	October 2021	-8.7%
Intel (INTC)	October 2021	-8.66%
Royal Caribbean Cruises (RCL)	October 2021	-8.53%
Comcast (CMCSA)	October 2021	-8.39%
Western Digital (WDC)	October 2021	-8.31%
Discover Financial Services (DFS)	October 2021	-8.27%
Charter Communications (CHTR)	October 2021	-8.19%
Warner Bros Discovery (WBD)	October 2021	-8.19%
Garmin (GRMN)	October 2021	-7.99%
Norwegian Cruise Line (NCLH)	October 2021	-7.45%
Capital One Financial (COF)	October 2021	-7.12%
Boeing (BA)	October 2021	-7.1%