Structure Therapeutics Inc American Depositary Shares (GPCR) had the highest return in September 2023 by a mid-cap US stock, returning 76.6%.

ASSET	MONTH	% RETURN
Structure Therapeutics Inc American Depositary Shares (GPCR)	September 2023	76.6%
Tango Therapeutics (TNGX)	September 2023	73.77%
Immunovant (IMVT)	September 2023	67.42%
Immunome (IMNM)	September 2023	29.06%
Warrior Met Coal (HCC)	September 2023	27%
Alpha Metallurgical Resources (AMR)	September 2023	26.12%
TAL Education (TAL)	September 2023	24.62%
Mirum Pharmaceuticals (MIRM)	September 2023	19.29%
NextNav (NN)	September 2023	18.98%
Peabody Energy (BTU)	September 2023	18.14%
VEON (VEON)	September 2023	17.97%
Uranium Energy (UEC)	September 2023	17.58%
Centrus Energy (LEU)	September 2023	17.15%
Mobileye Global Inc Class A Common Stock (MBLY)	September 2023	16.32%
Dianthus Therapeutics (DNTH)	September 2023	15.6%
Denison Mines (DNN)	September 2023	15.38%
CECO Environmental (CECO)	September 2023	14.97%
Liberty Energy (LBRT)	September 2023	14.22%
AeroVironment (AVAV)	September 2023	14.09%
Energy Fuels (UUUU)	September 2023	13.85%
Scholar Rock (SRRK)	September 2023	13.42%
Alliance Resource Partners (ARLP)	September 2023	12.43%
Skyward Specialty Insurance Group, Inc Common Stock (SKWD)	September 2023	12.22%
Hafnia (HAFN)	September 2023	12.14%
Ionis Pharmaceuticals (IONS)	September 2023	12%

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