ChronoScale (CHRN) had the highest return on May 13 by a mid-cap US stock, returning 20.9%.

ASSET	DATE	% RETURN
ChronoScale (CHRN)	5/13/2026	20.86%
Ouster, Inc Common Stock (OUST)	5/13/2026	18.79%
Karman (KRMN)	5/13/2026	18.58%
Kingsoft Cloud Holdings (KC)	5/13/2026	14.65%
Mobileye Global Inc Class A Common Stock (MBLY)	5/13/2026	12.62%
BioCryst Pharmaceuticals (BCRX)	5/13/2026	10.6%
Plug Power (PLUG)	5/13/2026	10%
Maase (MAAS)	5/13/2026	10%
Astronics (ATRO)	5/13/2026	9.71%
Fermi (FRMI)	5/13/2026	9.19%
Enphase Energy (ENPH)	5/13/2026	9.09%
Clover Health Investments (CLOV)	5/13/2026	8.9%
Tarsus Pharmaceuticals (TARS)	5/13/2026	8.87%
Applied Opt (AAOI)	5/13/2026	8.83%
Arcutis Biotherapeutics (ARQT)	5/13/2026	7.54%
Warby Parker (WRBY)	5/13/2026	7.51%
Nio Inc Class A ADR (NIO)	5/13/2026	7.39%
Lumen Technologies, Inc Common Stock (LUMN)	5/13/2026	7.31%
Vera Therapeutics (VERA)	5/13/2026	7.26%
Joby Aviation (JOBY)	5/13/2026	7.07%
Haemonetics (HAE)	5/13/2026	7.04%
Tango Therapeutics (TNGX)	5/13/2026	6.83%
Zai Lab (ZLAB)	5/13/2026	6.61%
VEON (VEON)	5/13/2026	6.52%
Rumble (RUM)	5/13/2026	5.85%

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