SoundHound AI (SOUN) had the best day in February 2024 by a mid-cap US stock on February 26, 2024, returning 45.9%.

ASSET	DATE	% RETURN
SoundHound AI (SOUN)	2/26/2024	45.94%
GeneDx (WGS)	2/21/2024	40.69%
Asset Entities Inc Class B Common Stock (ASST)	2/1/2024	33.62%
Polestar Automotive Holding UK PLC Class C-1 ADS (ADW) (PSNYW)	2/15/2024	32.69%
Polestar Automotive Holding UK PLC Class C-1 ADS (ADW) (PSNYW)	2/9/2024	28.17%
BigBearai (BBAI)	2/26/2024	27.69%
BigBearai (BBAI)	2/27/2024	26.47%
PureCycle Technologies (PCTTW)	2/14/2024	25%
Dave (DAVE)	2/2/2024	24.77%
American Bitcoin (ABTC)	2/8/2024	24.6%
Krystal Biotech (KRYS)	2/26/2024	23.85%
CleanSpark (CLSK)	2/26/2024	22.52%
WM Technology (MAPSW)	2/2/2024	22.26%
Viking Therapeutics (VKTX)	2/27/2024	21.9%
Acm Research (ACMR)	2/28/2024	21.75%
Polestar Automotive Holding UK PLC Class C-1 ADS (ADW) (PSNYW)	2/28/2024	20.21%
Polestar Automotive Holding UK PLC Class A ADS (PSNY)	2/28/2024	19.61%
Bitdeer Technologies Group Class A Ordinary Shares (BTDR)	2/26/2024	19.55%
Sotera Health (SHC)	2/27/2024	19.09%
WM Technology (MAPSW)	2/21/2024	18.91%
Lifestance Health (LFST)	2/1/2024	18.74%
PureCycle Technologies (PCTTW)	2/27/2024	18.59%
Hut 8 Corp Common Stock (HUT)	2/26/2024	18.36%
Goosehead Insurance (GSHD)	2/22/2024	18.33%
American Bitcoin (ABTC)	2/20/2024	18%

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