AXT (AXTI) had the highest return on March 19 by a mid-cap US stock, returning 26.8%.

ASSET	DATE	% RETURN
AXT (AXTI)	3/19/2026	26.83%
Scholar Rock (SRRK)	3/19/2026	16.22%
Applied Opt (AAOI)	3/19/2026	14.36%
Erasca (ERAS)	3/19/2026	14.05%
Vermilion Energy (VET)	3/19/2026	12.57%
Planet Labs PBC (PL)	3/19/2026	11.18%
Enliven Therapeutics (ELVN)	3/19/2026	10.89%
PayPay Corporation American Depository Shares (PAYP)	3/19/2026	10.54%
Almonty Industries Inc Common Shares (ALM)	3/19/2026	10.34%
Vera Therapeutics (VERA)	3/19/2026	10.03%
Viavi Solutions (VIAV)	3/19/2026	9.74%
Beta Technologies (BETA)	3/19/2026	9.34%
Signet Jewelers (SIG)	3/19/2026	9.21%
BBVA Banco Frances SA ADR (BBAR)	3/19/2026	9.17%
Ultra Clean (UCTT)	3/19/2026	8.9%
Sportradar (SRAD)	3/19/2026	8.72%
Onto Innovation (ONTO)	3/19/2026	8.21%
10X Genomics (TXG)	3/19/2026	8.18%
Karman (KRMN)	3/19/2026	7.89%
IPG Photonics (IPGP)	3/19/2026	7.84%
nLIGHT (LASR)	3/19/2026	7.79%
Forgent Power Solutions (FPS)	3/19/2026	7.58%
Definium Therapeutics (DFTX)	3/19/2026	7.49%
Guardian Pharmacy Services (GRDN)	3/19/2026	7.4%
Camtek (CAMT)	3/19/2026	7.33%

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