Soleno Therapeutics (SLNO) had the best month in 2023 by a mid-cap US stock in September 2023, returning 495%.

ASSET	MONTH	% RETURN
Soleno Therapeutics (SLNO)	September 2023	494.96%
QXO (QXO)	December 2023	364.95%
VinFast Auto Ltd Ordinary Shares (VFS)	August 2023	212.7%
Applied Digital (APLD)	May 2023	167.41%
Telephone and Data Systems (TDS)	August 2023	166.96%
United States Cellular (USM)	August 2023	160.48%
Cytokinetics (CYTK)	December 2023	149%
Bitdeer Technologies Group Class A Ordinary Shares (BTDR)	June 2023	126.72%
Hut 8 Corp Common Stock (HUT)	January 2023	126.21%
Arlington Asset Investment (AI)	May 2023	125.54%
Kingsoft Cloud Holdings (KC)	March 2023	120.6%
Bitdeer Technologies Group Class A Ordinary Shares (BTDR)	December 2023	113.42%
WM Technology (MAPSW)	July 2023	105.67%
Sotera Health (SHC)	January 2023	104.27%
TransMedics (TMDX)	November 2023	103.5%
Rigetti Computing (RGTI)	July 2023	102.44%
Terawulf (WULF)	December 2023	101.68%
Marathon Digital (MARA)	January 2023	101.4%
BridgeBio Pharma (BBIO)	July 2023	100.86%
Intuitive Machines (LUNR)	February 2023	99.01%
Upstart Holdings (UPST)	May 2023	96.82%
IONQ (IONQ)	May 2023	95.12%
Upstart Holdings (UPST)	July 2023	92.62%
Marathon Digital (MARA)	December 2023	92.54%
Vera Therapeutics (VERA)	June 2023	92.22%

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