Polestar Automotive Holding UK PLC Class C-1 ADS (ADW) (PSNYW) had the lowest return in 2023 by a mid-cap US stock, returning -80%.

ASSET	YEAR	% RETURN
Polestar Automotive Holding UK PLC Class C-1 ADS (ADW) (PSNYW)	2023	-80%
WM Technology (MAPSW)	2023	-72.73%
GeneDx (WGS)	2023	-69.14%
Nuscale Power (SMR)	2023	-67.93%
Lumen Technologies (LUMN)	2023	-65.47%
Regencell Bioscience (RGC)	2023	-62.5%
Hesai Group American Depositary Share, each ADS represents one Class B ordinary share (HSAI)	2023	-62.48%
Lufax (LU)	2023	-59.89%
Avidity Biosciences (RNA)	2023	-59.81%
Icahn Enterprises (IEP)	2023	-59.06%
Polestar Automotive Holding UK PLC Class A ADS (PSNY)	2023	-59.06%
PureCycle Technologies (PCTTW)	2023	-58.99%
GDS (GDS)	2023	-57.99%
Akero Therapeutics (AKRO)	2023	-57.39%
Advance Auto Parts (AAP)	2023	-57.36%
Bilibili (BILI)	2023	-52.24%
Enphase Energy (ENPH)	2023	-50.91%
Perimeter Solutions (PRM)	2023	-50.32%
VNET Group Inc DRC (VNET)	2023	-49.65%
FMC (FMC)	2023	-48.05%
Sibanye Gold Ltd ADR (SBSW)	2023	-47.49%
Organon (OGN)	2023	-45.06%
Quantum Computing (QUBT)	2023	-41.84%
D-Wave Quantum (QBTS)	2023	-41.33%
Purecycle Technologies (PCT)	2023	-40.96%

Mid-cap stocks are treated as having a market cap between $2B and $10B.