Arqit Quantum (ARQQ) had the highest return on June 23 by a small-cap US stock, returning 38%.

ASSET	DATE	% RETURN
Arqit Quantum (ARQQ)	6/23/2026	37.96%
BTQ Technologies Corp Common Stock (BTQ)	6/23/2026	31.03%
Monopar Therapeutics (MNPR)	6/23/2026	19.88%
YD Bio (YDES)	6/23/2026	17.27%
Teamshares (TMS)	6/23/2026	15.21%
Entravision Communications (EVC)	6/23/2026	15.2%
Galectin Therapeutics (GALT)	6/23/2026	15.13%
ECARX Holdings Inc Class A Ordinary shares (ECX)	6/23/2026	15.12%
Jade Biosciences (JBIO)	6/23/2026	14.19%
Entera Bio (ENTX)	6/23/2026	13.97%
Suja Life, Inc Class A Common Stock (SUJA)	6/23/2026	13.86%
4D Molecular Therapeutics (FDMT)	6/23/2026	13.5%
Backblaze (BLZE)	6/23/2026	13.09%
Liberty Latin America (LILA)	6/23/2026	12.9%
Treace Medical Concepts (TMCI)	6/23/2026	12.81%
Monte Rosa Therapeutics (GLUE)	6/23/2026	12.49%
Butterfly Network (BFLY)	6/23/2026	12.46%
Clearpoint Neuro (CLPT)	6/23/2026	12.3%
Autolus Therapeutics (AUTL)	6/23/2026	12.16%
Falcon's Beyond Global, Inc Class A Common Stock (FBYD)	6/23/2026	11.72%
Liberty Latin America Ltd Class C (LILAK)	6/23/2026	11.36%
Regenxbio (RGNX)	6/23/2026	11.3%
Advantage Solutions (ADV)	6/23/2026	11.13%
Playtika (PLTK)	6/23/2026	10.96%
WhiteFiber, Inc Ordinary Shares (WYFI)	6/23/2026	10.71%

Small-cap stocks are treated as having a market cap between $300M and $2B.