Celsius (CELH) had the highest return between 2020 and 2022 by a mid-cap US stock, returning 2,054%.

ASSET	YEARS	% RETURN
Celsius (CELH)	2020-2022	2,054.04%
Alpha Metallurgical Resources (AMR)	2020-2022	1,594.32%
Enphase Energy (ENPH)	2020-2022	904.78%
Weatherford International (WFRD)	2020-2022	757.96%
Calix (CALX)	2020-2022	755.38%
Chord Energy (CHRD)	2020-2022	561.32%
Range Resources (RRC)	2020-2022	414.49%
Avis Budget (CAR)	2020-2022	403.63%
Catalyst Pharmaceuticals (CPRX)	2020-2022	389.47%
Dillards (DDS)	2020-2022	386.14%
Verona Pharma PLC ADR (VRNA)	2020-2022	369.12%
Consol Energy (CEIX)	2020-2022	357.21%
Academy Sports Outdoors (ASO)	2020-2022	337.38%
Cytokinetics (CYTK)	2020-2022	330.64%
Uranium Energy (UEC)	2020-2022	317.2%
Impinj (PI)	2020-2022	316.08%
Freedom (FRHC)	2020-2022	295.52%
Sitime (SITM)	2020-2022	290.85%
Marathon Digital (MARA)	2020-2022	288.64%
Tecnoglass (TGLS)	2020-2022	288.27%
Plug Power (PLUG)	2020-2022	285.36%
Hafnia (HAFN)	2020-2022	273.55%
Grupo Simec SAB de CV ADR (SIM)	2020-2022	252.37%
NexGen Energy (NXE)	2020-2022	246.09%
Arcadium Lithium (ALTM)	2020-2022	244.98%

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