Warner Bros Discovery (WBD) had the worst day in Q1 2021 by a large-cap US stock on March 26, 2021, returning -27.1%.

ASSET	DATE	% RETURN
Warner Bros Discovery (WBD)	3/26/2021	-27.07%
Tencent Music Entertainment (TME)	3/24/2021	-27.06%
Paramount Skydance Corporation Class B Common Stock (PSKY)	3/26/2021	-26.65%
Rocket Companies (RKT)	3/3/2021	-24.52%
QXO (QXO)	2/26/2021	-22.62%
Coupang LLC (CPNG)	3/11/2021	-22.44%
Globalstar, Inc Common Stock (GSAT)	1/13/2021	-20%
Summit Therapeutics (SMMT)	2/10/2021	-18.62%
MicroStrategy (MSTR)	2/10/2021	-18.52%
Globalstar, Inc Common Stock (GSAT)	2/10/2021	-17.53%
Hut 8 Corp Common Stock (HUT)	1/29/2021	-17.39%
Permian Resources (PR)	3/5/2021	-17.36%
Paramount Skydance Corporation Class B Common Stock (PSKY)	3/24/2021	-16.94%
Sterling Infrastructure (STRL)	3/3/2021	-16.65%
Zoom Video Communications (ZM)	3/2/2021	-15.2%
Xpeng (XPEV)	3/24/2021	-14.87%
Permian Resources (PR)	3/16/2021	-14.51%
Summit Therapeutics (SMMT)	2/9/2021	-14.06%
Hut 8 Corp Common Stock (HUT)	2/10/2021	-13.77%
MicroStrategy (MSTR)	2/23/2021	-13.6%
Sitime (SITM)	2/25/2021	-13.17%
Ubiquiti Networks (UI)	3/31/2021	-13.03%
MicroStrategy (MSTR)	2/25/2021	-13%
SoFi Technologies (SOFI)	1/8/2021	-12.67%
Nutanix (NTNX)	2/25/2021	-12.64%

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