SL Science Holding Limited Ordinary Shares (SLBT) had the highest return on June 30 by a small-cap US stock, returning 41.3%.

ASSET	DATE	% RETURN
SL Science Holding Limited Ordinary Shares (SLBT)	6/30/2026	41.3%
FuelCell Energy (FCEL)	6/30/2026	24.6%
indie Semiconductor (INDI)	6/30/2026	19.73%
Rezolve AI Limited Ordinary Shares (RZLV)	6/30/2026	18.64%
First Tracks Biotherapeutics (TRAX)	6/30/2026	18.21%
Boost Run Inc Class A Common Stock (BRUN)	6/30/2026	15.71%
Kelly Services B (KELYB)	6/30/2026	14.61%
LightPath Technologies (LPTH)	6/30/2026	13.07%
Aeva Technologies, Inc Common Stock (AEVA)	6/30/2026	12.8%
Republic Airways (RJET)	6/30/2026	12.59%
Fanhua (AIFU)	6/30/2026	12.32%
RoboStrategy, Inc Common Stock (BOT)	6/30/2026	11.97%
Concentrix (CNXC)	6/30/2026	11.91%
Factorial Energy (FAC)	6/30/2026	11.91%
Hyliion (HYLN)	6/30/2026	11.09%
Arqit Quantum (ARQQ)	6/30/2026	10.98%
Xanadu Quantum Technologies Limited Class B Subordinate Voting Shares (XNDU)	6/30/2026	10.8%
X4 Pharmaceuticals (XFOR)	6/30/2026	10.4%
WhiteFiber, Inc Ordinary Shares (WYFI)	6/30/2026	10.34%
Zhong Yang Financial Group Limited Ordinary Shares (TOP)	6/30/2026	10.24%
Akso Health Group ADR (AHG)	6/30/2026	9.96%
VersaBank (VBNK)	6/30/2026	9.84%
Alpha Tau Medical (DRTS)	6/30/2026	9.68%
AEVEX (AVEX)	6/30/2026	9.31%
CEVA (CEVA)	6/30/2026	9.29%

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