Ondas (ONDS) had the highest return in August 2025 by a mid-cap US stock, returning 185.9%.

ASSET	MONTH	% RETURN
Ondas (ONDS)	August 2025	185.85%
Babcock & Wilcox Enterprises (BW)	August 2025	134.74%
Opendoor Technologies (OPEN)	August 2025	127.62%
QMMM Holdings Limited Ordinary Shares (QMMM)	August 2025	116.33%
CommScope (VISN)	August 2025	107.99%
ViaSat (VSAT)	August 2025	104.49%
Heartflow, Inc Common Stock (HTFL)	August 2025	65.79%
Bullish (BLSH)	August 2025	59.54%
Xometry (XMTR)	August 2025	59.46%
Sunrun (RUN)	August 2025	59.22%
SSR Mining (SSRM)	August 2025	58.67%
Aehr Test Systems (AEHR)	August 2025	53.54%
Cipher Mining (CIFR)	August 2025	51.83%
Tarsus Pharmaceuticals (TARS)	August 2025	50.63%
Helios Technologies (HLIO)	August 2025	50.33%
Liquidia Technologies (LQDA)	August 2025	49.78%
China Yuchai International (CYD)	August 2025	49%
Lemonade (LMND)	August 2025	45.93%
Hecla Mining (HL)	August 2025	45.05%
AXT (AXTI)	August 2025	45%
Sotera Health (SHC)	August 2025	44.23%
Mirum Pharmaceuticals (MIRM)	August 2025	43.91%
Ingevity (NGVT)	August 2025	43.86%
Dlocal (DLO)	August 2025	43.74%
Perimeter Solutions (PRM)	August 2025	42.07%

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