Sezzle (SEZL) had the highest return in August 2023 by a mid-cap US stock, returning 258%.

ASSET	MONTH	% RETURN
Sezzle (SEZL)	August 2023	257.97%
VinFast Auto Ltd Ordinary Shares (VFS)	August 2023	212.7%
Telephone and Data Systems (TDS)	August 2023	166.96%
Array Digital Infrastructure (AD)	August 2023	160.48%
United States Cellular (USM)	August 2023	160.48%
Applied Opt (AAOI)	August 2023	103.7%
Apellis Pharmaceuticals (APLS)	August 2023	66.44%
Belite Bio Inc ADR (BLTE)	August 2023	51.32%
Upwork (UPWK)	August 2023	44.21%
Capri (CPRI)	August 2023	43.1%
Dlocal (DLO)	August 2023	42.36%
Powell Industries (POWL)	August 2023	38.26%
Revolution Medicines (RVMD)	August 2023	37.59%
Rhythm Pharmaceuticals (RYTM)	August 2023	36.97%
Globalstar, Inc Common Stock (GSAT)	August 2023	35.85%
Abercrombie & Fitch (ANF)	August 2023	35.6%
Power Solutions International, Inc Common Stock (PSIX)	August 2023	35.56%
Acm Research (ACMR)	August 2023	35.08%
Eos Energy Enterprises (EOSE)	August 2023	34.85%
Paymentus (PAY)	August 2023	34.34%
Hawkins (HWKN)	August 2023	34.32%
Bitdeer Technologies Group Class A Ordinary Shares (BTDR)	August 2023	32.2%
Remitly Global (RELY)	August 2023	31.88%
Advantage Solutions (ADVWW)	August 2023	31.58%
IES (IESC)	August 2023	31.54%

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